app/src/main/AndroidManifest.xml

@@ -3,10 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-feature android:name="android.hardware.camera"/>
-    <uses-permission android:name="android.permission.CAMERA" />
-    <uses-permission android:name="android.permission.RECORD_AUDIO" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
-    <uses-feature android:name="android.hardware.Camera"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
 
     <application
         android:allowBackup="true"

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

@@ -10,20 +10,17 @@ import androidx.camera.core.ExperimentalGetImage;
 import android.Manifest;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
-import android.util.Log;
 import android.view.View;
 import android.widget.TextView;
 import android.widget.Toast;
 import android.widget.ToggleButton;
-import android.widget.VideoView;
 
 import com.example.ueberwachungssystem.VideoDetection.VideoDetector;
 
 @ExperimentalGetImage
 public class MainActivity extends AppCompatActivity {
 
-    private static final int CAMERA_PERMISSION_REQUEST_CODE = 100;
-    private static final int RECORD_VIDEO_PERMISSION_REQUEST_CODE = 102;
+    private static final int CAMERA_PERMISSION_REQUEST_CODE = 101;
 
 
     @Override
@@ -58,7 +55,6 @@ public class MainActivity extends AppCompatActivity {
                 }
                 else {
                     vd.stopDetection();
-                    textView.setText("");
                 }
             }
         });
@@ -80,9 +76,9 @@ public class MainActivity extends AppCompatActivity {
         if (requestCode == CAMERA_PERMISSION_REQUEST_CODE && grantResults.length > 0) {
             boolean cameraRights = grantResults[0] == PackageManager.PERMISSION_GRANTED;
             if (cameraRights) {
-                Toast.makeText(this, "permission granted", Toast.LENGTH_LONG).show();
+                Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
             } else {
-                Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
+                Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
             }
         }
     }

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

@@ -32,14 +32,15 @@ public class VideoDetector extends Detector {
     // Preview Camera Image
     private PreviewView previewView = null;
     // Detect Violation
-    private static final float PIXEL_THRESHOLD = 30f;  // Luminosity (brightness channel of YUV_420_888)
-    private static final float ALARM_THRESHOLD = 1f;   // Percent of pixels changed
+    private static final int PIXEL_THRESHOLD = 60;  // Luminosity (brightness channel of YUV_420_888)
+    private static final float ALARM_THRESHOLD = 0.5f;   // Percent of pixels changed
     private ByteBuffer previousBuffer = null;
 
 
 
     /** Constructor */
     public VideoDetector(Context context) {
+
         super();
         this.context = context;
     }
@@ -58,7 +59,6 @@ public class VideoDetector extends Detector {
                 cameraProvider = cameraProviderFuture.get();
                 bindLuminosityAnalysis(cameraProvider);
                 isDetectionRunning = true;
-                previousBuffer = null;
             } catch (ExecutionException | InterruptedException e) {
                 // No errors need to be handled for this Future. This should never be reached.
             }
@@ -117,17 +117,24 @@ public class VideoDetector extends Detector {
         if (previewView != null)
             preview.setSurfaceProvider(previewView.getSurfaceProvider());
 
-        cameraProvider.unbindAll();
         cameraProvider.bindToLifecycle((LifecycleOwner) context, cameraSelector, imageAnalysis, preview);
+        stopDetection();
     }
 
 
-
     /** Calculate Amount of Pixels changed */
     private int getChangedPixelCount(Image image) {
+        int width = image.getWidth();
+        int height = image.getHeight();
+
         Image.Plane[] planes = image.getPlanes();
         ByteBuffer buffer = planes[0].getBuffer();
 
+        int yRowStride = image.getPlanes()[0].getRowStride();
+        int yPixelStride = image.getPlanes()[0].getPixelStride();
+
+        int changedPixelCount = 0;
+
         if (previousBuffer == null) {
             previousBuffer = ByteBuffer.allocate(buffer.capacity());
             buffer.rewind();
@@ -136,15 +143,6 @@ public class VideoDetector extends Detector {
             return 0;
         }
 
-        int width = image.getWidth();
-        int height = image.getHeight();
-
-        int yRowStride = image.getPlanes()[0].getRowStride();
-        int yPixelStride = image.getPlanes()[0].getPixelStride();
-
-        int changedPixelCount = 0;
-
-        // Count changed pixels
         for (int y = 0; y < height; ++y) {
             for (int x = 0; x < width; x++) {
                 int index = (y * yRowStride) + (x * yPixelStride);
@@ -155,7 +153,6 @@ public class VideoDetector extends Detector {
                     changedPixelCount++;
             }
         }
-
         // Reset and copy Byte Buffer
         buffer.rewind();
         previousBuffer.rewind();

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

@@ -32,8 +32,6 @@
         android:id="@+id/previewView"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:backgroundTint="@android:color/black">
-
-    </androidx.camera.view.PreviewView>
+        android:backgroundTint="@android:color/black"/>
 
 </LinearLayout>