Refactor

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

@@ -55,6 +55,7 @@ public class MainActivity extends AppCompatActivity {
                 }
                 else {
                     vd.stopDetection();
+                    textView.setText("");
                 }
             }
         });

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

@@ -32,15 +32,14 @@ public class VideoDetector extends Detector {
     // Preview Camera Image
     private PreviewView previewView = null;
     // Detect Violation
-    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 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 ByteBuffer previousBuffer = null;
 
 
 
     /** Constructor */
     public VideoDetector(Context context) {
-
         super();
         this.context = context;
     }
@@ -59,6 +58,7 @@ 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.
             }
@@ -118,23 +118,15 @@ public class VideoDetector extends Detector {
             preview.setSurfaceProvider(previewView.getSurfaceProvider());
 
         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();
@@ -143,6 +135,15 @@ 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);
@@ -153,6 +154,7 @@ public class VideoDetector extends Detector {
                     changedPixelCount++;
             }
         }
+
         // Reset and copy Byte Buffer
         buffer.rewind();
         previousBuffer.rewind();