Refactor

# Conflicts:
#	app/src/main/java/com/example/ueberwachungssystem/MainActivity.java

app/build.gradle

@@ -36,5 +36,21 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
-    implementation 'com.jjoe64:graphview:4.2.2'
+
+
+    // OpenCV (from: https://github.com/QuickBirdEng/opencv-android)
+    def opencv_version = "4.5.3.0"
+    implementation "com.quickbirdstudios:opencv:${opencv_version}"
+
+    implementation "androidx.lifecycle:lifecycle-extensions:2.0.0"
+
+
+    // Required for CameraX
+    def camerax_version = "1.2.2"
+    implementation "androidx.camera:camera-core:${camerax_version}"
+    implementation "androidx.camera:camera-camera2:${camerax_version}"
+    implementation "androidx.camera:camera-lifecycle:${camerax_version}"
+    implementation "androidx.camera:camera-video:${camerax_version}"
+    implementation "androidx.camera:camera-view:${camerax_version}"
+    implementation "androidx.camera:camera-extensions:${camerax_version}"
 }

app/src/main/AndroidManifest.xml

@@ -2,12 +2,9 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
-    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
+    <uses-feature android:name="android.hardware.camera"/>
     <uses-permission android:name="android.permission.CAMERA"/>
-    <!--<uses-permission android:name="android.permission.BLUETOOTH"/>-->
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
-    <!--<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>-->
-    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
-    <uses-permission android:name="android.permission.INTERNET" />
 
     <application
         android:allowBackup="true"
@@ -27,6 +24,7 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+    <service android:name=".Detection.DetectorService"/>
     </application>
 
 </manifest>

app/src/main/java/com/example/ueberwachungssystem/Detection/AudioRecorder.java

@@ -0,0 +1,74 @@
+package com.example.ueberwachungssystem.Detection;
+
+import android.content.Context;
+import android.media.MediaPlayer;
+import android.media.MediaRecorder;
+import android.widget.Toast;
+
+import java.io.File;
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+public class AudioRecorder {
+    private final Context context;
+    private MediaRecorder mediaRecorder = null;
+    private boolean isRecording = false;
+    private File outputDir;      // Default: in app files directory
+
+
+    public AudioRecorder (Context context) {
+        this.context = context;
+        this.outputDir = context.getFilesDir();
+    }
+
+    public void startRecording() {
+        // Handle logic
+        if (outputDir == null)
+            return;
+        if (isRecording)
+            return;
+        isRecording = true;
+
+        // Setup Audio Recorder for output Format: 3GP
+        mediaRecorder = new MediaRecorder();
+        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
+        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
+        mediaRecorder.setOutputFile(outputDir + "/" + generateFileName() + ".3gp");
+        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
+        try {
+            mediaRecorder.prepare();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        mediaRecorder.start();
+    }
+
+    public void stopRecording() {
+        if (mediaRecorder != null) {
+            mediaRecorder.stop();
+            mediaRecorder.reset();
+            mediaRecorder.release();
+            mediaRecorder = null;
+            isRecording = false;
+            Toast.makeText(context, "audio recording saved", Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    public boolean isRecording(){
+        return isRecording;
+    }
+
+    public void setOutputDir(File outputDir) {
+        this.outputDir = outputDir;
+    }
+
+    private String generateFileName(){
+        // Get the current timestamp
+        LocalDateTime currentTime = LocalDateTime.now();
+        // Define the format for the timestamp
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss");
+        // Return the timestamp as a string
+        return currentTime.format(formatter);
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/Detection/DetectionReport.java

@@ -1,4 +1,4 @@
-package com.example.ueberwachungssystem.Detector;
+package com.example.ueberwachungssystem.Detection;
 
 import android.util.Log;
 
@@ -9,24 +9,26 @@ public class DetectionReport {
     public String timeStamp;
     public String detectionType;
     public float detectedValue;
-    public String detectorID;
+    public boolean detectionState;
 
-    public DetectionReport(String detectorID, String detectionType, float detectedAmplitude) {
+    public DetectionReport(boolean detectionState, String detectionType, float detectedAmplitude) {
         this.timeStamp = String.valueOf(Calendar.getInstance().getTime());
         this.detectionType = detectionType;
         this.detectedValue = detectedAmplitude;
-        this.detectorID = detectorID;
+        this.detectionState = detectionState;
+
+        //this.detectorID = detectorID;
     }
 
 
     /** Get Detection Report in String format */
     public String toString() {
+        String state = "State: " + "[" + this.detectionState + "]";
         String time = "Time: " + "[" + this.timeStamp + "]";
         String type = "Type: " + "[" + this.detectionType + "]";
         String value = "Value: " + "[" + this.detectedValue + "]";
-        String id = "ID: " + "[" + this.detectorID + "]";
 
-        return String.join("\t", time, type, value, id);
+        return String.join("\t", state, time, type, value);
     }
 
     /** Debug Report */

app/src/main/java/com/example/ueberwachungssystem/Detection/Detector.java

@@ -0,0 +1,76 @@
+package com.example.ueberwachungssystem.Detection;
+
+import android.os.CountDownTimer;
+
+import androidx.annotation.NonNull;
+import androidx.camera.core.ExperimentalGetImage;
+
+
+abstract public class Detector {
+    private OnDetectionListener listener;
+    private boolean isDetecting = false;
+    private boolean extendViolation = false;
+
+    // Countdown parameters
+    private final int COUNTDOWN_TIME = 10000;          // milliseconds
+    private final int COUNTDOWN_POLLING_TIME = 100;   // milliseconds
+
+    /** Constructor - takes context of current activity */
+    public Detector() {}
+
+
+    /** On Detection Listener - runs when violation is reported */
+    public interface OnDetectionListener {
+        void onDetection(@NonNull DetectionReport detectionReport);
+    }
+    public void setOnDetectionListener(@NonNull OnDetectionListener listener) {
+        this.listener = listener;
+    }
+
+    /** Triggers onDetectionListener - call this to trigger violation/alarm */
+    public void reportViolation(String detectionType, float amplitude) {
+        if (listener != null) {
+            if (!isDetecting) {
+                isDetecting = true;
+                DetectionReport detectionReport = new DetectionReport(true, detectionType, amplitude);
+                listener.onDetection(detectionReport);
+                startDetectionTimer(detectionType, amplitude);
+            } else {
+                extendViolation = true;
+            }
+        } else {
+            isDetecting = false;
+            extendViolation = false;
+        }
+    }
+
+    private void startDetectionTimer(String detectionType, float amplitude) {
+        isDetecting = true;
+        new CountDownTimer((long) COUNTDOWN_TIME, COUNTDOWN_POLLING_TIME) {
+            @Override
+            public void onTick(long millisUntilFinished) {
+                if (extendViolation) {
+                    extendViolation = false;
+                    startDetectionTimer(detectionType, amplitude);
+                    this.cancel();
+                }
+            }
+            @Override
+            public void onFinish() {
+                isDetecting = false;
+                DetectionReport detectionReport = new DetectionReport(false, detectionType, amplitude);
+                listener.onDetection(detectionReport);
+            }
+        }.start();
+    }
+
+    public void extendViolation(){
+        this.extendViolation = true;
+    }
+
+    /** Starts Detection (abstract method: needs to be overridden in child class) */
+    public abstract void startDetection();
+
+    /** Stops Detection (abstract method: needs to be overridden in child class) */
+    public abstract void stopDetection();
+}

app/src/main/java/com/example/ueberwachungssystem/Detection/DetectorService.java

@@ -0,0 +1,160 @@
+package com.example.ueberwachungssystem.Detection;
+
+import android.content.Intent;
+import android.os.Binder;
+import android.os.IBinder;
+import android.widget.ImageView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.camera.core.ExperimentalGetImage;
+import androidx.lifecycle.LifecycleService;
+
+import java.io.File;
+
+@ExperimentalGetImage
+public class DetectorService extends LifecycleService {
+    public ServiceBinder serviceBinder = new ServiceBinder();
+    private DetectorService.OnDetectionListener listener;
+    private boolean isServiceRunning = false;
+
+    VideoDetector videoDetector = null;
+    AudioRecorder audioRecorder = null;
+
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        if (isServiceRunning)
+            return START_NOT_STICKY;
+
+
+        // Setup Service classes:
+        videoDetector = new VideoDetector(this);
+        videoDetector.setOnDetectionListener(new Detector.OnDetectionListener() {
+            @Override
+            public void onDetection(@NonNull DetectionReport detectionReport) {
+                passToServiceListener(detectionReport);
+            }
+        });
+
+        audioRecorder = new AudioRecorder(this);
+
+
+
+        isServiceRunning = true;
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        isServiceRunning = false;
+    }
+
+    /** Service methods */
+    public class ServiceBinder extends Binder {
+        public DetectorService getBoundService() {
+            // Return an instance of the TestService
+            return DetectorService.this;
+        }
+    }
+    @Nullable
+    @Override
+    public IBinder onBind(Intent intent) {
+        super.onBind(intent);
+        return serviceBinder;
+    }
+
+
+    /** Video Detection */
+    public void startVideoDetection() {
+        if(videoDetector != null)
+            videoDetector.startDetection();
+    }
+    public void stopVideoDetection() {
+        if(videoDetector != null)
+            videoDetector.stopDetection();
+    }
+    public boolean isVideoDetectionRunning() {
+        if(videoDetector != null)
+           return videoDetector.isDetecting();
+        return false;
+    }
+    public void debugVideoProcessing(ImageView input, ImageView output) {
+        if(videoDetector != null)
+            videoDetector.debugProcessing(input, output);
+    }
+
+    /** Audio Detection */
+    public void startAudioDetection() {
+
+    }
+    public void stopAudioDetection() {
+
+    }
+
+    /** Motion Detection */
+    public void startMotionDetection() {
+
+    }
+    public void stopMotionDetection() {
+
+    }
+
+    /** Video Recording */
+    public void startVideoRecording() {
+        if(videoDetector != null)
+            videoDetector.startRecording();
+    }
+    public void stopVideoRecording() {
+        if(videoDetector != null)
+            videoDetector.stopRecording();
+    }
+    public boolean isVideoRecordingRunning() {
+        if(videoDetector != null)
+            return videoDetector.isRecording();
+        return false;
+    }
+    public void setVideoRecordingDir(File outputDir) {
+        if (videoDetector != null)
+            videoDetector.setOutputDir(outputDir);
+    }
+
+    /** Audio Recording */
+    public void startAudioRecording() {
+        if(audioRecorder != null)
+            audioRecorder.startRecording();
+    }
+    public void stopAudioRecording() {
+        if(audioRecorder != null)
+            audioRecorder.stopRecording();
+    }
+    public boolean isAudioRecordingRunning() {
+        if(videoDetector != null)
+            return audioRecorder.isRecording();
+        return false;
+    }
+    public void setAudioRecordingDir(File outputDir) {
+        if (audioRecorder != null)
+            audioRecorder.setOutputDir(outputDir);
+    }
+
+
+
+
+    /** pass Detection Report to Service Detection Listener and trigger it */
+    public void passToServiceListener(DetectionReport detectionReport) {
+        if (listener != null) {
+            listener.onDetection(detectionReport);
+        }
+    }
+
+
+    /** On Detection Listener - runs when violation is reported */
+    public interface OnDetectionListener {
+        void onDetection(@NonNull DetectionReport detectionReport);
+    }
+    public void setOnDetectionListener(@NonNull DetectorService.OnDetectionListener listener) {
+        this.listener = listener;
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/Detection/OpenCVHelper.java

@@ -0,0 +1,109 @@
+package com.example.ueberwachungssystem.Detection;
+
+import android.graphics.Bitmap;
+import android.media.Image;
+import android.widget.ImageView;
+
+import androidx.annotation.NonNull;
+import androidx.camera.core.ExperimentalGetImage;
+import androidx.camera.core.ImageProxy;
+
+import org.opencv.android.Utils;
+import org.opencv.core.Core;
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfPoint;
+import org.opencv.core.Scalar;
+import org.opencv.core.Size;
+import org.opencv.imgproc.Imgproc;
+
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+
+@ExperimentalGetImage
+public class OpenCVHelper {
+
+    /** OpenCV helper methods **/
+    public static Mat addGaussianBlur(Mat inputMat, Size kernelSize){
+        Mat outputMat = new Mat();
+        Imgproc.GaussianBlur(inputMat, outputMat, kernelSize, 0);
+        return outputMat;
+    }
+
+    public static Mat addBlur(Mat inputMat, Size kernelSize){
+        Mat outputMat = new Mat();
+        Imgproc.blur(inputMat, outputMat, kernelSize);
+        return outputMat;
+    }
+
+    public static Mat extractYChannel(@NonNull ImageProxy imgProxy) {
+        Image img = imgProxy.getImage();
+
+        assert img != null;
+        ByteBuffer yBuffer = img.getPlanes()[0].getBuffer();
+        byte[] yData = new byte[yBuffer.remaining()];
+        yBuffer.get(yData);
+
+        Mat yMat = new Mat(img.getHeight(), img.getWidth(), CvType.CV_8UC1);
+        yMat.put(0, 0, yData);
+
+        return yMat;
+    }
+
+    public static Mat thresholdPixels(Mat inputMat, Mat previousImage, int threshold){
+        Mat diffImage = new Mat();
+        Core.absdiff(inputMat, previousImage, diffImage);
+        Mat binaryMat = new Mat();
+        Imgproc.threshold(diffImage, binaryMat, threshold, 255, Imgproc.THRESH_BINARY);
+        return binaryMat;
+    }
+
+
+    public static Mat thresholdContourArea(Mat inputMat, float areaThreshold){
+        List<MatOfPoint> contours = new ArrayList<>();
+        Mat hierarchy = new Mat();
+        Imgproc.findContours(inputMat, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
+
+        Mat outputMat = new Mat(inputMat.size(), inputMat.type(), new Scalar(0));
+        // Iterate over the contours and draw only the larger contours on the outputMat
+        for (MatOfPoint contour : contours) {
+            double contourArea = Imgproc.contourArea(contour);
+            if (contourArea > areaThreshold) {
+                Imgproc.drawContours(outputMat, Collections.singletonList(contour), 0, new Scalar(255), -1);
+            }
+        }
+        // Apply the outputMat as a mask to the dilatedImage
+        Mat maskedImage = new Mat();
+        inputMat.copyTo(maskedImage, outputMat);
+        return outputMat;
+    }
+
+    public static Mat dilateBinaryMat(Mat inputMat, Size kernelSize){
+        Mat dilatedMat = new Mat();
+        Mat kernel = Imgproc.getStructuringElement(Imgproc.MORPH_ELLIPSE, kernelSize);
+        Imgproc.dilate(inputMat, dilatedMat, kernel);
+        return dilatedMat;
+    }
+
+    public static int countNonZeroPixels(Mat inputImage) {
+        if (inputImage != null)
+            return Core.countNonZero(inputImage);
+        else
+            return 0;
+    }
+
+
+    public static void debugMat(Mat mat, ImageView imageView) {
+        if (imageView == null || mat == null)
+            return;
+
+        Bitmap bitmap = Bitmap.createBitmap(mat.cols(), mat.rows(), Bitmap.Config.ARGB_8888);
+        Utils.matToBitmap(mat, bitmap);
+
+        // Display the bitmap in an ImageView
+        imageView.setImageBitmap(bitmap);
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/Detection/VideoDetector.java

@@ -0,0 +1,327 @@
+package com.example.ueberwachungssystem.Detection;
+
+import android.Manifest;
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.graphics.ImageFormat;
+import android.media.Image;
+import android.os.CountDownTimer;
+import android.util.Log;
+import android.view.Display;
+import android.view.Surface;
+import android.view.WindowManager;
+import android.widget.ImageView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.camera.core.CameraSelector;
+import androidx.camera.core.ExperimentalGetImage;
+import androidx.camera.core.ImageAnalysis;
+import androidx.camera.core.ImageProxy;
+import androidx.camera.core.Preview;
+import androidx.camera.core.VideoCapture;
+import androidx.camera.lifecycle.ProcessCameraProvider;
+import androidx.camera.view.PreviewView;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+import androidx.lifecycle.LifecycleOwner;
+
+import com.google.common.util.concurrent.ListenableFuture;
+
+import org.opencv.android.OpenCVLoader;
+import org.opencv.core.Mat;
+import org.opencv.core.Size;
+
+import java.io.File;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.concurrent.ExecutionException;
+
+
+/**
+ * Video Detector inherits some methods from abstract Detector class (more info there)
+ * USE FROM MAIN ACTIVITY:
+ * VideoDetector vd = new VideoDetector(this);
+ * */
+
+
+@ExperimentalGetImage
+public class VideoDetector extends Detector {
+    // Calling Activity
+    private final Context context;
+
+    // Camera Provider
+    private ProcessCameraProvider cameraProvider;
+    private ImageAnalysis imageAnalysis;
+    private VideoCapture videoCapture;
+    //private Preview preview;
+
+    // Logic
+    private boolean isDetecting = false;
+    private boolean isRecording = false;
+    private boolean allowReportViolation = false;
+
+    // Image Processing
+    private Mat previousImage = null;
+
+    // Debugging
+    private ImageView inputImageView = null;
+    private ImageView outputImageView = null;
+
+    // Recorder
+    private File outputDir;      // Default: in app files directory
+
+
+    // Parameters
+    private static final float ALARM_THRESHOLD = 0f;   // Percent of pixels changed
+    private static final float AREA_THRESHOLD = 10f;
+    private static final int DILATE_ITERATIONS = 2;
+    private static final float START_DELAY = 20000;   // milliseconds
+    private static final android.util.Size IMAGE_RES = new android.util.Size(640, 480);
+
+
+
+    /** Constructor */
+    public VideoDetector(Context context) {
+        super();
+        this.context = context;
+        this.imageAnalysis = setupImageAnalysis();
+        this.videoCapture = setupVideoCapture();
+        this.outputDir = context.getFilesDir();
+        //this.preview = new Preview.Builder().build();
+    }
+
+    /** Get States */
+    public boolean isDetecting() {
+        return isDetecting;
+    }
+    public boolean isRecording(){
+        return isRecording;
+    }
+
+
+    /** Starts the Video Detection */
+    @Override
+    public void startDetection() {
+        // Check States
+        if (isDetecting)
+            return;
+        // Configure Image Analysis
+        imageAnalysis = setupImageAnalysis();
+        // Open CV startup check
+        if (!OpenCVLoader.initDebug()) {
+            Log.e("OpenCV", "Unable to load OpenCV!");
+            return;
+        } else
+            Log.d("OpenCV", "OpenCV loaded Successfully!");
+        // Get Process Camera Provider and start
+        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(context);
+        cameraProviderFuture.addListener(() -> {
+            try {
+                cameraProvider = cameraProviderFuture.get();
+                isDetecting = true;
+                bindCameraProvider();
+            } catch (ExecutionException | InterruptedException e) {}
+        }, ContextCompat.getMainExecutor(context));
+        // Disable Violation Calling for Setup Time
+        startViolationTimer(START_DELAY);
+    }
+
+    /** Starts the Recorder */
+    @SuppressLint("RestrictedApi")
+    public void startRecording() {
+        // Check States
+        if (isRecording){
+            return;
+        }
+
+        videoCapture = setupVideoCapture();
+
+        final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(context);
+        cameraProviderFuture.addListener(() -> {
+            try {
+                cameraProvider = cameraProviderFuture.get();
+                isRecording = true;
+                bindCameraProvider();
+
+                File vidFile = new File(context.getFilesDir() + "/" + generateFileName() + ".mp4");
+                if (ActivityCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
+                    return;
+                }
+                videoCapture.startRecording(
+                        new VideoCapture.OutputFileOptions.Builder(vidFile).build(),
+                        context.getMainExecutor(),
+                        new VideoCapture.OnVideoSavedCallback() {
+                            @Override
+                            public void onVideoSaved(@NonNull VideoCapture.OutputFileResults outputFileResults) {
+                                isRecording = false;
+                                Toast.makeText(context, "video recording saved", Toast.LENGTH_SHORT).show();
+                            }
+                            @Override
+                            public void onError(int videoCaptureError, @NonNull String message, @Nullable Throwable cause) {
+                                isRecording = false;
+                                Toast.makeText(context, "video recording failed", Toast.LENGTH_SHORT).show();
+                            }
+                        }
+                );
+            } catch (ExecutionException | InterruptedException ignored) {}
+        }, ContextCompat.getMainExecutor(context));
+    }
+
+    /** Stops the Video Detection */
+    @Override
+    public void stopDetection() {
+        if (!isDetecting || imageAnalysis == null)
+            return;
+        cameraProvider.unbind(imageAnalysis);
+        isDetecting = false;
+        allowReportViolation = false;
+    }
+
+    /** Stops the Recording */
+    @SuppressLint("RestrictedApi")
+    public void stopRecording(){
+        if(!isRecording)
+            return;
+
+        videoCapture.stopRecording();
+        cameraProvider.unbind(videoCapture);
+        isRecording = false;
+    }
+
+    /** Bind Camera Provider */
+    private void bindCameraProvider() {
+        // Specify which Camera to use
+        CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
+        cameraProvider.unbindAll();
+        cameraProvider.bindToLifecycle((LifecycleOwner) context, cameraSelector, imageAnalysis, videoCapture);
+    }
+
+    /** Setup Use Cases */
+    private ImageAnalysis setupImageAnalysis() {
+        // Configure and create Image Analysis
+        ImageAnalysis.Builder builder = new ImageAnalysis.Builder();
+        builder.setTargetResolution(IMAGE_RES);
+        builder.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST);
+        builder.setOutputImageFormat(ImageAnalysis.OUTPUT_IMAGE_FORMAT_YUV_420_888);
+        builder.setTargetRotation(Surface.ROTATION_90);
+        ImageAnalysis imageAnalysis = builder.build();
+        // Set Analyzer
+        imageAnalysis.setAnalyzer(ContextCompat.getMainExecutor(context), imageProxy -> {
+            if (imageProxy.getFormat() == ImageFormat.YUV_420_888) {
+                Image image = imageProxy.getImage();
+                assert image != null;
+
+                // Violation Handling
+                Mat processed = processImage(imageProxy);
+
+                int n = OpenCVHelper.countNonZeroPixels(processed);
+                int pixelCount = image.getWidth() * image.getHeight();
+                float percentChanged = (float) n / pixelCount;
+
+                // Violation Condition
+                if (percentChanged * 100 > ALARM_THRESHOLD) {
+                    if (allowReportViolation)
+                        reportViolation("Video", percentChanged);
+                }
+            }
+            imageProxy.close();
+        });
+        return imageAnalysis;
+    }
+
+    @SuppressLint("RestrictedApi")
+    private VideoCapture setupVideoCapture() {
+        int rotation = getDisplayRotation();
+        return new VideoCapture.Builder()
+                .setTargetRotation(rotation)
+                .build();
+    }
+
+    /** Process Image to be used for Motion Detection */
+    private Mat processImage(ImageProxy imageProxy){
+        if (imageProxy == null)
+            return null;
+        // Image Transformation
+        Mat imageMat = OpenCVHelper.extractYChannel(imageProxy);
+        // Show Input Image
+        if (inputImageView != null)
+            OpenCVHelper.debugMat(imageMat, inputImageView);
+        // Preprocess Image
+        Mat preprocessed = imageMat;
+        preprocessed = OpenCVHelper.addGaussianBlur(preprocessed, new Size(21, 21));
+        preprocessed = OpenCVHelper.addBlur(preprocessed, new Size(3, 3));
+        // Set Previous Image
+        if (previousImage == null) {
+            previousImage = preprocessed;
+            return null;
+        }
+        // Process Image
+        Mat processed = preprocessed.clone();
+        processed = OpenCVHelper.thresholdPixels(processed, previousImage, 25);
+
+        for(int i = 0; i < DILATE_ITERATIONS; i++)
+            processed = OpenCVHelper.dilateBinaryMat(processed, new Size(3,3));
+
+        processed = OpenCVHelper.thresholdContourArea(processed, AREA_THRESHOLD);
+        // Output
+        previousImage = preprocessed.clone();
+        // Show Output Image
+        if (outputImageView != null)
+            OpenCVHelper.debugMat(processed, outputImageView);
+        return processed;
+    }
+
+
+    /** Debug input and result of processing */
+    public void debugProcessing(@NonNull ImageView inputImageView, @NonNull ImageView outputImageView){
+        this.inputImageView = inputImageView;
+        this.outputImageView = outputImageView;
+    }
+
+    /**
+    private void setPreviewView(@NonNull PreviewView previewView) {
+        // Create Preview
+        if (this.preview != null)
+            this.preview.setSurfaceProvider(previewView.getSurfaceProvider());
+    }
+     */
+
+
+    /** Generate File Name */
+    private String generateFileName(){
+        // Get the current timestamp
+        LocalDateTime currentTime = LocalDateTime.now();
+        // Define the format for the timestamp
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd_HHmmss");
+        // Return the timestamp as a string
+        return currentTime.format(formatter);
+    }
+
+
+    /** Get current Display Rotation */
+    private int getDisplayRotation() {
+        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
+        Display display = windowManager.getDefaultDisplay();
+        return display.getRotation();
+    }
+
+    /** Start delay until Violation Report is allowed */
+    private void startViolationTimer(float setupTime) {
+        new CountDownTimer((long) (START_DELAY), 100) {
+            @Override
+            public void onTick(long millisUntilFinished) {
+            }
+            @Override
+            public void onFinish() {
+                allowReportViolation = true;
+            }
+        }.start();
+    }
+
+    public void setOutputDir(File outputDir) {
+        this.outputDir = outputDir;
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/Detector/Detector.java

@@ -1,39 +0,0 @@
-package com.example.ueberwachungssystem.Detector;
-
-import android.content.Context;
-import androidx.annotation.NonNull;
-
-
-abstract public class Detector {
-    private OnDetectionListener listener;
-
-    /** Constructor - takes context of current activity */
-    public Detector(Context context) {};
-
-
-    /** On Detection Listener - runs when violation is reported */
-    public interface OnDetectionListener {
-        void onDetection(@NonNull DetectionReport detectionReport);
-    }
-    public void setOnDetectionListener(@NonNull OnDetectionListener listener) {
-        this.listener = listener;
-    }
-
-
-    /** Triggers onDetectionListener - call this to trigger violation/alarm */
-    public void reportViolation(String detectorID, String detectionType, float amplitude) {
-        if (listener != null) {
-            DetectionReport detectionReport = new DetectionReport(detectorID, detectionType, amplitude);
-            listener.onDetection(detectionReport);
-        } else {
-            throw new IllegalStateException("No listener set for violation reporting");
-        }
-    }
-
-
-    /** Starts Detection (abstract method: needs to be overridden in child class) */
-    public abstract void startDetection();
-
-    /** Stops Detection (abstract method: needs to be overridden in child class) */
-    public abstract void stopDetection();
-}

app/src/main/java/com/example/ueberwachungssystem/Detector/MicrophoneDetector.java

@@ -1,421 +0,0 @@
-package com.example.ueberwachungssystem.Detector;
-
-import static java.lang.Math.*;
-
-import android.Manifest;
-import android.app.Activity;
-import android.content.Context;
-import android.content.pm.PackageManager;
-import android.media.AudioFormat;
-import android.media.AudioRecord;
-import android.media.MediaRecorder;
-import android.os.AsyncTask;
-import android.util.Log;
-
-import androidx.core.app.ActivityCompat;
-import androidx.core.content.ContextCompat;
-
-import com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex;
-import com.example.ueberwachungssystem.Detector.Signalverarbeitung.FFT;
-import com.example.ueberwachungssystem.Detector.logger.Logger;
-import com.jjoe64.graphview.GraphView;
-import com.jjoe64.graphview.series.DataPoint;
-import com.jjoe64.graphview.series.LineGraphSeries;
-
-public class MicrophoneDetector extends Detector {
-    /**
-     * Constructor - takes context of current activity
-     *
-     * @param context
-     */
-
-    private static final int RECHTEANFORDERUNG_MIKROFON = 1;
-
-    private AufnahmeTask aufnahmeTask;
-    public boolean armed = false;
-    public int Schwellwert_Alarm = 100;
-    private Activity MainActivityForClass;
-
-    public MicrophoneDetector(Context context) {
-        super(context);
-        MainActivityForClass = (Activity) context;
-
-        if (!istZugriffAufMikrofonErlaubt()) {
-            zugriffAufMikrofonAnfordern();
-        }
-    }
-
-    @Override
-    public void startDetection() {
-
-        if (!istZugriffAufMikrofonErlaubt()) {
-            zugriffAufMikrofonAnfordern();
-        }
-        if (istZugriffAufMikrofonErlaubt()) {
-            aufnahmeTask = new AufnahmeTask();
-            aufnahmeTask.execute();
-        }
-    }
-
-    @Override
-    public void stopDetection() {
-        if (aufnahmeTask != null) {
-            aufnahmeTask.cancel(true);
-        }
-    }
-
-    private boolean istZugriffAufMikrofonErlaubt() {
-        if (ContextCompat.checkSelfPermission(MainActivityForClass, android.Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
-            Log.d("0","Zugriff auf Mikrofon ist verboten.");
-            return false;
-        } else {
-            Log.d("0","Zugriff auf Mikrofon ist erlaubt.");
-            return true;
-        }
-    }
-
-    private void zugriffAufMikrofonAnfordern() {
-        ActivityCompat.requestPermissions(MainActivityForClass, new String[]{Manifest.permission.RECORD_AUDIO}, RECHTEANFORDERUNG_MIKROFON);
-    }
-
-    class AufnahmeTask extends AsyncTask<Long, Verarbeitungsergebnis, Void> {
-        private AudioRecord recorder;
-        private final int sampleRateInHz = 44100;
-        private final int channelConfig = AudioFormat.CHANNEL_IN_MONO;
-        private final int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
-        private int minPufferGroesseInBytes;
-        private int pufferGroesseInBytes;
-        private RingPuffer ringPuffer = new RingPuffer(10);
-        private float kalibierWert;
-        private DetectionReport detectionReport;
-
-        AufnahmeTask() {
-            minPufferGroesseInBytes = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);
-            pufferGroesseInBytes = minPufferGroesseInBytes * 2;
-            if (ActivityCompat.checkSelfPermission(MainActivityForClass, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
-                // TODO: Consider calling
-                //    ActivityCompat#requestPermissions
-                // here to request the missing permissions, and then overriding
-                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
-                //                                          int[] grantResults)
-                // to handle the case where the user grants the permission. See the documentation
-                // for ActivityCompat#requestPermissions for more details.
-                ActivityCompat.requestPermissions(MainActivityForClass, new String[]{Manifest.permission.RECORD_AUDIO}, RECHTEANFORDERUNG_MIKROFON);
-            }
-
-            recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRateInHz, channelConfig, audioFormat, pufferGroesseInBytes);
-
-            Log.d("0","Puffergroeße: "+ minPufferGroesseInBytes + " " + pufferGroesseInBytes);
-            Log.d("0","Recorder (SR, CH): "+ recorder.getSampleRate() + " " + recorder.getChannelCount());
-
-            int anzahlBytesProAbtastwert;
-            String s;
-            switch (recorder.getAudioFormat()) {
-                case AudioFormat.ENCODING_PCM_8BIT:
-                    s = "8 Bit PCM ";
-                    anzahlBytesProAbtastwert = 1;
-                    break;
-                case AudioFormat.ENCODING_PCM_16BIT:
-                    s = "16 Bit PCM";
-                    anzahlBytesProAbtastwert = 2;
-                    break;
-                case AudioFormat.ENCODING_PCM_FLOAT:
-                    s = "Float PCM";
-                    anzahlBytesProAbtastwert = 4;
-                    break;
-                default:
-                    throw new IllegalArgumentException();
-            }
-
-            switch (recorder.getChannelConfiguration()) {
-                case AudioFormat.CHANNEL_IN_MONO:
-                    s = "Mono";
-                    break;
-                case AudioFormat.CHANNEL_IN_STEREO:
-                    s = "Stereo";
-                    anzahlBytesProAbtastwert *= 2;
-                    break;
-                case AudioFormat.CHANNEL_INVALID:
-                    s = "ungültig";
-                    break;
-                default:
-                    throw new IllegalArgumentException();
-            }
-
-            Log.d("0","Konfiguration: "+ s);
-
-            int pufferGroesseInAnzahlAbtastwerten = pufferGroesseInBytes / anzahlBytesProAbtastwert;
-            int pufferGroesseInMillisekunden = 1000 * pufferGroesseInAnzahlAbtastwerten / recorder.getSampleRate();
-
-        }
-
-        @Override
-        protected Void doInBackground(Long... params) {
-            recorder.startRecording();
-            short[] puffer = new short[pufferGroesseInBytes / 2];
-            long lastTime = System.currentTimeMillis();
-            float verarbeitungsrate = 0;
-            final int maxZaehlerZeitMessung = 10;
-            int zaehlerZeitMessung = 0;
-            int anzahlVerarbeitet = 0;
-            GleitenderMittelwert gleitenderMittelwert = new GleitenderMittelwert(0.3f);
-
-            //Kalibrierung
-            try {
-                Thread.sleep(3000); // Time to lay down the phone
-            } catch (InterruptedException e) {
-                e.printStackTrace();
-            }
-            int i = 0;
-            for (i = 0; i < 20; i++) {
-                int n = recorder.read(puffer, 0, puffer.length);
-                Verarbeitungsergebnis kalibrierErgebnis = verarbeiten(puffer, n);
-                kalibierWert += kalibrierErgebnis.maxAmp;
-                try {
-                    Thread.sleep(50);
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                }
-            }
-            kalibierWert = kalibierWert/i;
-
-//            __Part of FFT__
-//            Complex[] zeitSignal = new Complex[puffer.length];
-//            for (int j = 0; j < puffer.length; j++) {
-//                zeitSignal[j] = new Complex(puffer[j], 0);
-//            }
-//            Complex[] spektrum = FFT.fft(zeitSignal);
-//            double[] spektrum = calculateFFT(puffer);
-//            DataPoint AddPoint;
-//            LineGraphSeries<DataPoint> series = new LineGraphSeries<DataPoint>(new DataPoint[]{});
-//            for (i = 0; i < spektrum.length; i++) {
-//                AddPoint = new DataPoint(i, spektrum[i]);
-//                series.appendData(AddPoint, true, spektrum.length);
-//            }
-//            graph.addSeries(series);
-
-            for (; ; ) {
-                if (aufnahmeTask.isCancelled()) {
-                    break;
-                } else {
-                    int n = recorder.read(puffer, 0, puffer.length);
-                    Verarbeitungsergebnis ergebnis = verarbeiten(puffer, n);
-                    anzahlVerarbeitet += n;
-//                    __Part of FFT__
-//                    spektrum = calculateFFT(puffer);
-//                    LineGraphSeries<DataPoint> newseries = new LineGraphSeries<DataPoint>(new DataPoint[]{});
-//                    for (i = 0; i < spektrum.length; i++) {
-//                        AddPoint = new DataPoint(i, spektrum[i]);
-//                        newseries.appendData(AddPoint, true, spektrum.length);
-//                    }
-
-                    zaehlerZeitMessung++;
-                    if (zaehlerZeitMessung == maxZaehlerZeitMessung) {
-                        long time = System.currentTimeMillis();
-                        long deltaTime = time - lastTime;
-                        verarbeitungsrate = 1000.0f * anzahlVerarbeitet / deltaTime;
-                        verarbeitungsrate = gleitenderMittelwert.mittel(verarbeitungsrate);
-                        zaehlerZeitMessung = 0;
-                        anzahlVerarbeitet = 0;
-                        lastTime = time;
-                    }
-
-
-                    ergebnis.verarbeitungsrate = (int) verarbeitungsrate;
-                    publishProgress(ergebnis);
-
-                    try {
-                        Thread.sleep(10);
-                    } catch (InterruptedException e) {
-                        e.printStackTrace();
-                    }
-                }
-            }
-            recorder.release();
-            return null;
-        }
-
-        private Verarbeitungsergebnis verarbeiten(short[] daten, int n) {
-            String status;
-            short maxAmp = -1;
-            if (n == AudioRecord.ERROR_INVALID_OPERATION) {
-                status = "ERROR_INVALID_OPERATION";
-            } else if (n == AudioRecord.ERROR_BAD_VALUE) {
-                status = "ERROR_BAD_VALUE";
-            } else {
-                status = "OK";
-                short max = 0;
-                for (int i = 0; i < n; i++) {
-                    if (daten[i] > max) {
-                        max = daten[i];
-                    }
-                }
-
-                ringPuffer.hinzufuegen(max);
-                maxAmp = ringPuffer.maximum();
-                if (maxAmp <= Schwellwert_Alarm+kalibierWert) {
-                    armed = true;
-                }
-            }
-
-            return new Verarbeitungsergebnis(status, maxAmp, 0);
-        }
-
-        @Override
-        protected void onProgressUpdate(Verarbeitungsergebnis... progress) {
-            super.onProgressUpdate(progress);
-            float maxAmpPrint = round(20*log10(abs(progress[0].maxAmp/1.0)));
-            float kalibierWertPrint = round(20*log10(abs(kalibierWert)));
-            Log.d("0","VR, Max, Kal:" + progress[0].verarbeitungsrate + ", " + maxAmpPrint
-            + " dB, " + kalibierWertPrint + " dB");
-
-            if (progress[0].maxAmp >= Schwellwert_Alarm+kalibierWert && armed == true) {
-                armed = false;
-                detectionReport = new DetectionReport("Mic1", "Audio", maxAmpPrint);
-                reportViolation("Mic1", "Audio", maxAmpPrint);
-                Log.d("1",detectionReport.toString());
-            }
-        }
-    }
-
-    private double[] calculateFFT(short[] zeitsignal)
-    {
-        byte signal[] = new byte[zeitsignal.length];
-        // loops through all the values of a Short
-        for (int i = 0; i < zeitsignal.length-1; i++) {
-            signal[i] = (byte) (zeitsignal[i]);
-            signal[i+1] = (byte) (zeitsignal[i] >> 8);
-        }
-
-        final int mNumberOfFFTPoints =1024;
-        double mMaxFFTSample;
-
-        double temp;
-        Complex[] y;
-        Complex[] complexSignal = new Complex[mNumberOfFFTPoints];
-        double[] absSignal = new double[mNumberOfFFTPoints/2];
-
-        for(int i = 0; i < mNumberOfFFTPoints; i++){
-            temp = (double)((signal[2*i] & 0xFF) | (signal[2*i+1] << 8)) / 32768.0F;
-            complexSignal[i] = new Complex(temp,0.0);
-        }
-
-        y = FFT.fft(complexSignal);
-
-        mMaxFFTSample = 0.0;
-        for(int i = 0; i < (mNumberOfFFTPoints/2); i++)
-        {
-            absSignal[i] = y[i].abs();
-//            absSignal[i] = Math.sqrt(Math.pow(y[i].re(), 2) + Math.pow(y[i].im(), 2));
-//            if(absSignal[i] > mMaxFFTSample)
-//            {
-//                mMaxFFTSample = absSignal[i];
-//            }
-        }
-
-        return absSignal;
-
-    }
-
-    class Verarbeitungsergebnis {
-        String status;
-        short maxAmp;
-        int verarbeitungsrate;
-        Verarbeitungsergebnis(String status, short maxAmp, int verarbeitungsrate) {
-            this.status = status;
-            this.maxAmp = maxAmp;
-            this.verarbeitungsrate = verarbeitungsrate;
-        }
-    }
-
-    class RingPuffer {
-        private short[] puffer;
-        private final int laenge;
-        private int anzahlEnthaltenerDaten;
-        private int position;
-
-        public RingPuffer(int n) {
-            laenge = n;
-            anzahlEnthaltenerDaten = 0;
-            position = 0;
-            puffer = new short[laenge];
-        }
-
-        public void hinzufuegen(short wert) {
-            puffer[position] = wert;
-            position++;
-            if (position >= laenge) {
-                position = 0;
-            }
-            if (anzahlEnthaltenerDaten < laenge) {
-                anzahlEnthaltenerDaten++;
-            }
-        }
-
-        public void hinzufuegen(short[] daten) {
-            for (short d : daten) {
-                puffer[position] = d;
-                position++;
-                if (position >= laenge) {
-                    position = 0;
-                }
-            }
-            if (anzahlEnthaltenerDaten < laenge) {
-                anzahlEnthaltenerDaten += daten.length;
-                if (anzahlEnthaltenerDaten >= laenge) {
-                    anzahlEnthaltenerDaten = laenge;
-                }
-            }
-        }
-
-        public short maximum() {
-            short max = 0;
-            for (int i = 0; i < anzahlEnthaltenerDaten; i++) {
-                if (puffer[i] > max) {
-                    max = puffer[i];
-                }
-            }
-            return max;
-        }
-
-        public float mittelwert() {
-            float summe = 0;
-            for (int i = 0; i < anzahlEnthaltenerDaten; i++) {
-                summe += puffer[i];
-            }
-            return summe / anzahlEnthaltenerDaten;
-        }
-    }
-
-    class GleitenderMittelwert {
-        private final float wichtungNeuerWert;
-        private final float wichtungAlterWert;
-        private float mittelwert = 0;
-        private boolean istMittelwertGesetzt = false;
-
-        GleitenderMittelwert(float wichtungNeuerWert) {
-            this.wichtungNeuerWert = wichtungNeuerWert;
-            this.wichtungAlterWert = 1 - this.wichtungNeuerWert;
-        }
-
-        float MittelwertPuffer(short[] puffer) {
-
-            for (int i = 0; i < puffer.length; i++) {
-                mittelwert = Math.abs(puffer[i]);
-            }
-            mittelwert = mittelwert/puffer.length;
-
-            return mittelwert;
-        }
-
-        float mittel(float wert) {
-            if (istMittelwertGesetzt) {
-                mittelwert = wert * wichtungNeuerWert + mittelwert * wichtungAlterWert;
-            } else {
-                mittelwert = wert;
-                istMittelwertGesetzt = true;
-            }
-            return mittelwert;
-        }
-    }
-}

app/src/main/java/com/example/ueberwachungssystem/Detector/Signalverarbeitung/Complex.java

@@ -1,148 +0,0 @@
-package com.example.ueberwachungssystem.Detector.Signalverarbeitung;
-
-import java.util.Objects;
-
-public class Complex {
-    private final double re;   // the real part
-    private final double im;   // the imaginary part
-
-    // create a new object with the given real and imaginary parts
-    public Complex(double real, double imag) {
-        re = real;
-        im = imag;
-    }
-
-    // return a string representation of the invoking com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object
-    public String toString() {
-        if (im == 0) return re + "";
-        if (re == 0) return im + "i";
-        if (im < 0) return re + " - " + (-im) + "i";
-        return re + " + " + im + "i";
-    }
-
-    // return abs/modulus/magnitude
-    public double abs() {
-        return Math.hypot(re, im);
-    }
-
-    // return angle/phase/argument, normalized to be between -pi and pi
-    public double phase() {
-        return Math.atan2(im, re);
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is (this + b)
-    public Complex plus(Complex b) {
-        Complex a = this;             // invoking object
-        double real = a.re + b.re;
-        double imag = a.im + b.im;
-        return new Complex(real, imag);
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is (this - b)
-    public Complex minus(Complex b) {
-        Complex a = this;
-        double real = a.re - b.re;
-        double imag = a.im - b.im;
-        return new Complex(real, imag);
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is (this * b)
-    public Complex times(Complex b) {
-        Complex a = this;
-        double real = a.re * b.re - a.im * b.im;
-        double imag = a.re * b.im + a.im * b.re;
-        return new Complex(real, imag);
-    }
-
-    // return a new object whose value is (this * alpha)
-    public Complex scale(double alpha) {
-        return new Complex(alpha * re, alpha * im);
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is the conjugate of this
-    public Complex conjugate() {
-        return new Complex(re, -im);
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is the reciprocal of this
-    public Complex reciprocal() {
-        double scale = re * re + im * im;
-        return new Complex(re / scale, -im / scale);
-    }
-
-    // return the real or imaginary part
-    public double re() {
-        return re;
-    }
-
-    public double im() {
-        return im;
-    }
-
-    // return a / b
-    public Complex divides(Complex b) {
-        Complex a = this;
-        return a.times(b.reciprocal());
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is the complex exponential of this
-    public Complex exp() {
-        return new Complex(Math.exp(re) * Math.cos(im), Math.exp(re) * Math.sin(im));
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is the complex sine of this
-    public Complex sin() {
-        return new Complex(Math.sin(re) * Math.cosh(im), Math.cos(re) * Math.sinh(im));
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is the complex cosine of this
-    public Complex cos() {
-        return new Complex(Math.cos(re) * Math.cosh(im), -Math.sin(re) * Math.sinh(im));
-    }
-
-    // return a new com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex object whose value is the complex tangent of this
-    public Complex tan() {
-        return sin().divides(cos());
-    }
-
-    // a static version of plus
-    public static Complex plus(Complex a, Complex b) {
-        double real = a.re + b.re;
-        double imag = a.im + b.im;
-        Complex sum = new Complex(real, imag);
-        return sum;
-    }
-
-    // See Section 3.3.
-    public boolean equals(Object x) {
-        if (x == null) return false;
-        if (this.getClass() != x.getClass()) return false;
-        Complex that = (Complex) x;
-        return (this.re == that.re) && (this.im == that.im);
-    }
-
-    // See Section 3.3.
-    public int hashCode() {
-        return Objects.hash(re, im);
-    }
-
-    // sample client for testing
-    public static void main(String[] args) {
-        Complex a = new Complex(5.0, 6.0);
-        Complex b = new Complex(-3.0, 4.0);
-
-        System.out.println("a            = " + a);
-        System.out.println("b            = " + b);
-        System.out.println("Re(a)        = " + a.re());
-        System.out.println("Im(a)        = " + a.im());
-        System.out.println("b + a        = " + b.plus(a));
-        System.out.println("a - b        = " + a.minus(b));
-        System.out.println("a * b        = " + a.times(b));
-        System.out.println("b * a        = " + b.times(a));
-        System.out.println("a / b        = " + a.divides(b));
-        System.out.println("(a / b) * b  = " + a.divides(b).times(b));
-        System.out.println("conj(a)      = " + a.conjugate());
-        System.out.println("|a|          = " + a.abs());
-        System.out.println("tan(a)       = " + a.tan());
-    }
-}

app/src/main/java/com/example/ueberwachungssystem/Detector/Signalverarbeitung/FFT.java

@@ -1,246 +0,0 @@
-package com.example.ueberwachungssystem.Detector.Signalverarbeitung;
-// Source: https://introcs.cs.princeton.edu/java/97data/FFT.java.html
-
-/******************************************************************************
- *  Compilation:  javac FFT.java
- *  Execution:    java FFT n
- *  Dependencies: com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex.java
- *
- *  Compute the FFT and inverse FFT of a length n complex sequence
- *  using the radix 2 Cooley-Tukey algorithm.
- *  Bare bones implementation that runs in O(n log n) time and O(n)
- *  space. Our goal is to optimize the clarity of the code, rather
- *  than performance.
- *
- *  This implementation uses the primitive root of unity w = e^(-2 pi i / n).
- *  Some resources use w = e^(2 pi i / n).
- *
- *  Reference: https://www.cs.princeton.edu/~wayne/kleinberg-tardos/pdf/05DivideAndConquerII.pdf
- *
- *  Limitations
- *  -----------
- *   -  assumes n is a power of 2
- *
- *   -  not the most memory efficient algorithm (because it uses
- *      an object type for representing complex numbers and because
- *      it re-allocates memory for the subarray, instead of doing
- *      in-place or reusing a single temporary array)
- *
- *  For an in-place radix 2 Cooley-Tukey FFT, see
- *  https://introcs.cs.princeton.edu/java/97data/InplaceFFT.java.html
- *
- ******************************************************************************/
-
-public class FFT {
-
-    // compute the FFT of x[], assuming its length n is a power of 2
-    public static Complex[] fft(Complex[] x) {
-        int n = x.length;
-
-        // base case
-        if (n == 1) return new Complex[]{x[0]};
-
-        // radix 2 Cooley-Tukey FFT
-        if (n % 2 != 0) {
-            throw new IllegalArgumentException("n is not a power of 2");
-        }
-
-        // compute FFT of even terms
-        Complex[] even = new Complex[n / 2];
-        for (int k = 0; k < n / 2; k++) {
-            even[k] = x[2 * k];
-        }
-        Complex[] evenFFT = fft(even);
-
-        // compute FFT of odd terms
-        Complex[] odd = even;  // reuse the array (to avoid n log n space)
-        for (int k = 0; k < n / 2; k++) {
-            odd[k] = x[2 * k + 1];
-        }
-        Complex[] oddFFT = fft(odd);
-
-        // combine
-        Complex[] y = new Complex[n];
-        for (int k = 0; k < n / 2; k++) {
-            double kth = -2 * k * Math.PI / n;
-            Complex wk = new Complex(Math.cos(kth), Math.sin(kth));
-            y[k] = evenFFT[k].plus(wk.times(oddFFT[k]));
-            y[k + n / 2] = evenFFT[k].minus(wk.times(oddFFT[k]));
-        }
-        return y;
-    }
-
-
-    // compute the inverse FFT of x[], assuming its length n is a power of 2
-    public static Complex[] ifft(Complex[] x) {
-        int n = x.length;
-        Complex[] y = new Complex[n];
-
-        // take conjugate
-        for (int i = 0; i < n; i++) {
-            y[i] = x[i].conjugate();
-        }
-
-        // compute forward FFT
-        y = fft(y);
-
-        // take conjugate again
-        for (int i = 0; i < n; i++) {
-            y[i] = y[i].conjugate();
-        }
-
-        // divide by n
-        for (int i = 0; i < n; i++) {
-            y[i] = y[i].scale(1.0 / n);
-        }
-
-        return y;
-
-    }
-
-    // compute the circular convolution of x and y
-    public static Complex[] cconvolve(Complex[] x, Complex[] y) {
-
-        // should probably pad x and y with 0s so that they have same length
-        // and are powers of 2
-        if (x.length != y.length) {
-            throw new IllegalArgumentException("Dimensions don't agree");
-        }
-
-        int n = x.length;
-
-        // compute FFT of each sequence
-        Complex[] a = fft(x);
-        Complex[] b = fft(y);
-
-        // point-wise multiply
-        Complex[] c = new Complex[n];
-        for (int i = 0; i < n; i++) {
-            c[i] = a[i].times(b[i]);
-        }
-
-        // compute inverse FFT
-        return ifft(c);
-    }
-
-
-    // compute the linear convolution of x and y
-    public static Complex[] convolve(Complex[] x, Complex[] y) {
-        Complex ZERO = new Complex(0, 0);
-
-        Complex[] a = new Complex[2 * x.length];
-        for (int i = 0; i < x.length; i++) a[i] = x[i];
-        for (int i = x.length; i < 2 * x.length; i++) a[i] = ZERO;
-
-        Complex[] b = new Complex[2 * y.length];
-        for (int i = 0; i < y.length; i++) b[i] = y[i];
-        for (int i = y.length; i < 2 * y.length; i++) b[i] = ZERO;
-
-        return cconvolve(a, b);
-    }
-
-    // compute the DFT of x[] via brute force (n^2 time)
-    public static Complex[] dft(Complex[] x) {
-        int n = x.length;
-        Complex ZERO = new Complex(0, 0);
-        Complex[] y = new Complex[n];
-        for (int k = 0; k < n; k++) {
-            y[k] = ZERO;
-            for (int j = 0; j < n; j++) {
-                int power = (k * j) % n;
-                double kth = -2 * power * Math.PI / n;
-                Complex wkj = new Complex(Math.cos(kth), Math.sin(kth));
-                y[k] = y[k].plus(x[j].times(wkj));
-            }
-        }
-        return y;
-    }
-
-    // display an array of com.example.ueberwachungssystem.Detector.Signalverarbeitung.Complex numbers to standard output
-    public static void show(Complex[] x, String title) {
-        System.out.println(title);
-        System.out.println("-------------------");
-        for (int i = 0; i < x.length; i++) {
-            System.out.println(x[i]);
-        }
-        System.out.println();
-    }
-
-    /***************************************************************************
-     *  Test client and sample execution
-     *
-     *  % java FFT 4
-     *  x
-     *  -------------------
-     *  -0.03480425839330703
-     *  0.07910192950176387
-     *  0.7233322451735928
-     *  0.1659819820667019
-     *
-     *  y = fft(x)
-     *  -------------------
-     *  0.9336118983487516
-     *  -0.7581365035668999 + 0.08688005256493803i
-     *  0.44344407521182005
-     *  -0.7581365035668999 - 0.08688005256493803i
-     *
-     *  z = ifft(y)
-     *  -------------------
-     *  -0.03480425839330703
-     *  0.07910192950176387 + 2.6599344570851287E-18i
-     *  0.7233322451735928
-     *  0.1659819820667019 - 2.6599344570851287E-18i
-     *
-     *  c = cconvolve(x, x)
-     *  -------------------
-     *  0.5506798633981853
-     *  0.23461407150576394 - 4.033186818023279E-18i
-     *  -0.016542951108772352
-     *  0.10288019294318276 + 4.033186818023279E-18i
-     *
-     *  d = convolve(x, x)
-     *  -------------------
-     *  0.001211336402308083 - 3.122502256758253E-17i
-     *  -0.005506167987577068 - 5.058885073636224E-17i
-     *  -0.044092969479563274 + 2.1934338938072244E-18i
-     *  0.10288019294318276 - 3.6147323062478115E-17i
-     *  0.5494685269958772 + 3.122502256758253E-17i
-     *  0.240120239493341 + 4.655566391833896E-17i
-     *  0.02755001837079092 - 2.1934338938072244E-18i
-     *  4.01805098805014E-17i
-     *
-     ***************************************************************************/
-
-    public static void main(String[] args) {
-        int n = Integer.parseInt(args[0]);
-        Complex[] x = new Complex[n];
-
-        // original data
-        for (int i = 0; i < n; i++) {
-            x[i] = new Complex(i, 0);
-        }
-        show(x, "x");
-
-        // FFT of original data
-        Complex[] y = fft(x);
-        show(y, "y = fft(x)");
-
-        // FFT of original data
-        Complex[] y2 = dft(x);
-        show(y2, "y2 = dft(x)");
-
-        // take inverse FFT
-        Complex[] z = ifft(y);
-        show(z, "z = ifft(y)");
-
-        // circular convolution of x with itself
-        Complex[] c = cconvolve(x, x);
-        show(c, "c = cconvolve(x, x)");
-
-        // linear convolution of x with itself
-        Complex[] d = convolve(x, x);
-        show(d, "d = convolve(x, x)");
-    }
-}
-
-

app/src/main/java/com/example/ueberwachungssystem/MainActivity.java

@@ -2,66 +2,78 @@ package com.example.ueberwachungssystem;
 
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.camera.core.ExperimentalGetImage;
+import androidx.camera.view.PreviewView;
 
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
-import android.widget.Switch;
+import android.widget.ImageView;
-import android.widget.TextView;
+import android.widget.ToggleButton;
-
-import com.example.ueberwachungssystem.Detector.DetectionReport;
-import com.example.ueberwachungssystem.Detector.Detector;
-import com.example.ueberwachungssystem.Detector.MicrophoneDetector;
-import com.jjoe64.graphview.GraphView;
 
+import com.example.ueberwachungssystem.Detection.AudioRecorder;
+import com.example.ueberwachungssystem.Detection.DetectionReport;
+import com.example.ueberwachungssystem.Detection.Detector;
+import com.example.ueberwachungssystem.Detection.VideoDetector;
 
+@ExperimentalGetImage
 public class MainActivity extends AppCompatActivity {
-    private TextView tv_log;
+
-    MicrophoneDetector Mic;
-    private Switch TglBtn_Mic;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
-        tv_log = (TextView) findViewById(R.id.tv_log); //Set textview for showing logged content
+
-        Log.d("Main",this.getClass().getSimpleName() + ".onCreate");
+
-        Mic = new MicrophoneDetector(this);
+        ImageView inputImageView = findViewById(R.id.inputImageView);
-        setupMic();
+        ImageView outputImageView = findViewById(R.id.outputImageView);
-        Mic.setOnDetectionListener(new Detector.OnDetectionListener() {
+        PreviewView previewView = findViewById(R.id.previewView);
+
+
+        PermissionHandler permissionHandler = new PermissionHandler(this);
+
+
+        permissionHandler.getPermissions();
+
+        if (permissionHandler.hasPermissions()) {
+            AudioRecorder audioRecorder = new AudioRecorder(this);
+            VideoDetector vd = new VideoDetector(this);
+            //vd.setPreviewView(previewView);
+            vd.debugProcessing(inputImageView, outputImageView);
+            vd.setOnDetectionListener(new Detector.OnDetectionListener() {
                 @Override
                 public void onDetection(@NonNull DetectionReport detectionReport) {
-                Log.d("Main", "Detection erkannt!");
+                    Log.d("onDetection", detectionReport.toString());
                 }
             });
+            vd.startDetection();
 
-    }
+            ToggleButton toggleButton = findViewById(R.id.toggleButton);
-
+            toggleButton.setOnClickListener(new View.OnClickListener() {
-    @Override
-    public void onResume() {
-        super.onResume();
-        Log.d("Main",this.getClass().getSimpleName() + ".onResume");
-    }
-
-    @Override
-    public void onPause() {
-        super.onPause();
-        Log.d("Main",this.getClass().getSimpleName() + ".onPause");
-    }
-
-    private void setupMic() {
-        TglBtn_Mic = (Switch) findViewById(R.id.TglBtn_Mic);
-        TglBtn_Mic.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
-                if (v == TglBtn_Mic) {
+                    if (toggleButton.isChecked())
-                    Log.d("Main","onClick toggleButtonThread " + TglBtn_Mic.isChecked());
+                    {
-                    if (TglBtn_Mic.isChecked()) {
+                        //vd.startDetection();
-                        Mic.startDetection();
+                        //vd.stopDetection();
-                    } else {
+                        vd.startRecording();
-                        Mic.stopDetection();
+                        audioRecorder.startRecording();
                     }
+                    else {
+                        //vd.stopDetection();
+                        vd.stopRecording();
+                        audioRecorder.stopRecording();
                     }
                 }
             });
+
+
+
+
+
+
+
+        }
+
     }
 }

app/src/main/java/com/example/ueberwachungssystem/PermissionHandler.java

@@ -0,0 +1,43 @@
+package com.example.ueberwachungssystem;
+
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.widget.Toast;
+
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+
+public class PermissionHandler {
+    private final Context context;
+    private static final int PERMISSION_REQUEST_CODE = 23409;
+    private static final String[] permissions = new String[]{
+            android.Manifest.permission.CAMERA,
+            android.Manifest.permission.RECORD_AUDIO
+    };
+
+    public PermissionHandler(Context context) {
+        this.context = context;
+    }
+
+    public boolean hasPermissions() {
+        boolean permissionState = true;
+        for (String permission: permissions) {
+            permissionState = permissionState && ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED;
+        }
+        return permissionState;
+    }
+
+    public void getPermissions() {
+        if (!hasPermissions())
+            ActivityCompat.requestPermissions((Activity) context, permissions, PERMISSION_REQUEST_CODE);
+    }
+
+    public void showPermissionToast() {
+        if (hasPermissions())
+            Toast.makeText(context, "permissions available", Toast.LENGTH_SHORT).show();
+        else
+            Toast.makeText(context, "permissions missing", Toast.LENGTH_SHORT).show();
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -1,26 +1,41 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:layout_gravity="center"
+    android:gravity="top"
+    android:orientation="vertical"
     tools:context=".MainActivity">
 
-    <TextView
+
-        android:id="@+id/tv_log"
+    <androidx.camera.view.PreviewView
+        android:id="@+id/previewView"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:backgroundTint="@android:color/black"/>
+
+    <ToggleButton
+        android:id="@+id/toggleButton"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="ToggleButton" />
+
+    <ImageView
+        android:id="@+id/inputImageView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Log"
+        tools:srcCompat="@tools:sample/avatars" />
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/TglBtn_Mic" />
 
-    <Switch
+    <ImageView
-        android:id="@+id/TglBtn_Mic"
+        android:id="@+id/outputImageView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Mic"
+        tools:srcCompat="@tools:sample/avatars" />
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+    <androidx.camera.view.PreviewView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+</LinearLayout>

gradle.properties

@@ -19,4 +19,3 @@ android.useAndroidX=true
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
 android.nonTransitiveRClass=true
-android.enableJetifier=true