Zeit eingeführt die Doppelalarme verhindert

Durch clustern der Pixel eventuell bessere Detektion realisiert

app/src/main/java/com/example/greenwatch/KameraAktivitaet.java

@@ -3,6 +3,8 @@ package com.example.greenwatch;
 import android.graphics.ImageFormat;
 import android.media.Image;
 import android.os.Bundle;
+import android.os.Handler;
+import android.util.Log;
 import android.util.Size;
 
 import android.widget.TextView;
@@ -27,9 +29,22 @@ public class KameraAktivitaet extends AppCompatActivity {
     private boolean isMotionDetected;
     private boolean camera_alarm;
     private TextView alarm;
+    private TextView test;
+
+
+    // Bildverarbeitung Variablen
     private ByteBuffer previousBuffer;
     private int previousWidth;
     private int previousHeight;
+    private int threshold = 50;
+    private int startX;
+    private int startY;
+    private int endX;
+    private int endY;
+
+    private static final long ALARM_RESET_DELAY = 5000;
+    private boolean isAlarmSet = false;
+    private Handler alarmResetHandler = new Handler();
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -38,6 +53,7 @@ public class KameraAktivitaet extends AppCompatActivity {
 
         // NUR FÜR TESTS
         alarm = findViewById(R.id.textView);
+        test = findViewById(R.id.textView2);
 
         // PREVIEW //
         // previewView = findViewById(R.id.previewView);
@@ -85,9 +101,8 @@ public class KameraAktivitaet extends AppCompatActivity {
                         if (isMotionDetected) {
                             alarm.setText("ALARM");
                             camera_alarm = true;
-                        } else {
-                            camera_alarm = false;
-                            alarm.setText("OK");
+
+                            alarmResetHandler.postDelayed(alarmResetRunnable, ALARM_RESET_DELAY);
                         }
 
                     }
@@ -108,35 +123,87 @@ public class KameraAktivitaet extends AppCompatActivity {
 
     // Bildverarbeitung zur Bewegungserkennung
     private boolean compareFrames(Image currentImage) {
-
-        ByteBuffer currentBuffer = currentImage.getPlanes()[0].getBuffer();
-
+        Image.Plane[] planes = currentImage.getPlanes();
+        ByteBuffer currentBuffer = planes[0].getBuffer();
         int currentWidth = currentImage.getWidth();
         int currentHeight = currentImage.getHeight();
+        int yRowStride = planes[0].getRowStride();
+        int yPixelStride = planes[0].getPixelStride();
+
+
+        //System.out.println("Höhe: " + currentHeight + "   Breite: " + currentWidth);
 
         if (previousWidth != currentWidth || previousHeight != currentHeight) {
             return false;
         }
 
-        for (int row = 0; row < previousHeight; row++) {
-            for (int col = 0; col < previousWidth; col++) {
+        // Blöcke weiter verkleinern
+        int blockSize = kleinstesQuadrat(previousHeight, previousWidth) / 8;
+
+        //System.out.println(blockSize);
+
+        int numBlocksX = currentWidth / blockSize;
+        int numBlocksY = currentHeight / blockSize;
 
-                int previousIndex = row * previousWidth + col;
-                int currentIndex = row * currentWidth + col;
+        for (int blockY = 0; blockY < numBlocksY; blockY++) {
+            for (int blockX = 0; blockX < numBlocksX; blockX++) {
+                startX = blockX * blockSize;
+                startY = blockY * blockSize;
+                endX = startX + blockSize;
+                endY = startY + blockSize;
 
-                int previousPixel = previousBuffer.get(previousIndex) & 0xFF;
-                int currentPixel = currentBuffer.get(currentIndex) & 0xFF;
+                float currentLuminance = berechneMittlereLuminanz(currentBuffer, yRowStride, yPixelStride);
+                float previousLuminance = berechneMittlereLuminanz(previousBuffer, yRowStride, yPixelStride);
 
-                int pixelDifference = Math.abs(previousPixel - currentPixel);
-                int threshold = 120;
+                int pixelDifference = Math.abs((int) previousLuminance - (int) currentLuminance);
+
+                //System.out.println(pixelDifference);
 
                 if (pixelDifference > threshold) {
-                    // Testzwecke
-                    //String text = String.valueOf(pixelDifference);
+                    System.out.println(pixelDifference);
                     return true;
                 }
             }
         }
+
         return false;
     }
-}
+
+    private float berechneMittlereLuminanz(ByteBuffer buffer, int rowStride, int pixelStride) {
+        int sumLuminance = 0;
+        int countPixels = 0;
+
+        for (int row = startY; row < endY; row++) {
+            for (int col = startX; col < endX; col++) {
+                int bufferIndex = row * rowStride + col * pixelStride;
+                int currentPixel = buffer.get(bufferIndex) & 0xFF;
+
+                sumLuminance += currentPixel;
+                countPixels++;
+            }
+        }
+
+        float averageLuminance = (float) sumLuminance / countPixels;
+
+        return averageLuminance;
+    }
+
+    private int kleinstesQuadrat(int height, int width) {
+        if (height == width) {
+            return height;
+        } else if (height > width) {
+            return kleinstesQuadrat(height - width, width);
+        } else {
+            return kleinstesQuadrat(height, width - height);
+        }
+    }
+
+    private Runnable alarmResetRunnable = new Runnable() {
+        @Override
+        public void run() {
+            camera_alarm = false;
+            alarm.setText("OK");
+        }
+    };
+}
+

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

@@ -35,6 +35,6 @@ public class MainActivity extends AppCompatActivity {
     }
 
     private void starteKameraAktivitaet() {
-        startActivity(new Intent(this, Kamera_Beschleunigungssensor.class));
+        startActivity(new Intent(this, KameraAktivitaet.class));
     }
 }

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

@@ -30,5 +30,15 @@
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintVertical_bias="0.247" />
 
+    <TextView
+        android:id="@+id/textView2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="TextView"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="@+id/textView" />
+
 
 </androidx.constraintlayout.widget.ConstraintLayout>