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Detector based on OpenCV working

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This commit is contained in:
Bastian Kohler 2023-06-14 19:43:18 +02:00
parent 8551abfc5d
commit 50b579705e
2 changed files with 37 additions and 51 deletions
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2
app/src/main/java/com/example/ueberwachungssystem/Detection/Detector.java
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@ -11,7 +11,7 @@ abstract public class Detector {
private boolean extendDetection = false;
// Countdown parameters
private int COUNTDOWN_TIME = 1000; // milliseconds
private int COUNTDOWN_TIME = 3000; // milliseconds
private int COUNTDOWN_POLLING_TIME = 100; // milliseconds
/** Constructor - takes context of current activity */

78
app/src/main/java/com/example/ueberwachungssystem/Detection/VideoDetector.java
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@ -37,12 +37,8 @@ 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);
*
* */
@ -56,22 +52,18 @@ public class VideoDetector extends Detector {
private Boolean isDetectionRunning = false;
// Detection
private Mat previousImage = null;
private Mat lastThresh;
private Mat currentOut;
public ImageView imageView1 = null;
public ImageView imageView2 = null;
private int frameCnt = 0;
// Parameters
private static final float PIXEL_THRESHOLD = 30f; // Luminosity (brightness channel of YUV_420_888)
private static final float PIXEL_THRESHOLD = 40f; // Luminosity (brightness channel of YUV_420_888)
private static final int BLUR_KERNEL_SIZE = 5;
private static final int DILATE_KERNEL_SIZE = 5;
private static final float CONTOUR_THRESHOLD = 100;
private static final float ALARM_THRESHOLD = 0.2f; // Percent of pixels changed
private static final float CONTOUR_THRESHOLD = 250;
private static final float ALARM_THRESHOLD = 0.5f; // Percent of pixels changed
private static final long START_DELAY = 1000; // milliseconds
private static final android.util.Size IMAGE_RES = new android.util.Size(640, 480);
@ -87,7 +79,6 @@ public class VideoDetector extends Detector {
this.context = context;
}
/**
* Starts the Video Detection
* */
@ -148,17 +139,23 @@ public class VideoDetector extends Detector {
Image image = imageProxy.getImage();
assert image != null;
if (image != null) {
Mat mat = extractYChannel(image);
debugMat(mat, imageView2);
//mat = alternativeProcessImage(mat);
mat = processImage(mat);
debugMat(mat, imageView1);
if (frameCnt <= 5) {
reportViolation("Video", 0);
frameCnt++;
int n = 0;
n = countNonZeroPixels(mat);
int pixelCount = image.getWidth() * image.getHeight();
float percentChanged = (float)n / pixelCount;
// report violation
if (percentChanged * 100 > ALARM_THRESHOLD) {
reportViolation("Video", n);
}
}
}
imageProxy.close();
@ -170,7 +167,7 @@ public class VideoDetector extends Detector {
// Specify which Camera to use
CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
// Delay till start
new CountDownTimer((long)(START_DELAY), 1000){
new CountDownTimer((long)(START_DELAY), 100){
@Override
public void onTick(long millisUntilFinished) {}
@Override
@ -180,6 +177,20 @@ public class VideoDetector extends Detector {
}.start();
}
private Mat processImage(Mat image){
if (previousImage == null) {
previousImage = image;
return null;
}
Mat mat = addGaussianBlur(image, BLUR_KERNEL_SIZE);
mat = thresholdPixels(mat, previousImage, PIXEL_THRESHOLD);
mat = dilateNonZero(mat, DILATE_KERNEL_SIZE);
mat = thresholdContourArea(mat, CONTOUR_THRESHOLD);
previousImage = image.clone();
return mat;
}
private Mat extractYChannel(@NonNull Image img) {
ByteBuffer yBuffer = img.getPlanes()[0].getBuffer();
@ -192,34 +203,6 @@ public class VideoDetector extends Detector {
return yMat;
}
private Mat processImage(Mat currentImage){
if (previousImage == null) {
previousImage = currentImage;
return null;
}
Mat mat = new Mat();
currentImage = addGaussianBlur(currentImage, BLUR_KERNEL_SIZE);
mat = thresholdPixels(currentImage, previousImage, PIXEL_THRESHOLD);
mat = dilateNonZero(mat, DILATE_KERNEL_SIZE);
mat = thresholdContourArea(mat, CONTOUR_THRESHOLD);
previousImage = currentImage.clone();
return mat;
}
private Mat alternativeProcessImage(Mat currentImage){
if (previousImage == null) {
previousImage = currentImage;
return null;
} else if (lastThresh == null) {
lastThresh = thresholdPixels(currentImage, previousImage, PIXEL_THRESHOLD);
return null;
}
return null;
}
private Mat thresholdPixels(Mat inputMat, Mat previousImage, float luminosityThreshold){
Mat diffImage = new Mat();
@ -264,7 +247,10 @@ public class VideoDetector extends Detector {
}
private int countNonZeroPixels(Mat inputImage) {
if (inputImage != null)
return Core.countNonZero(inputImage);
else
return 0;
}
private void debugMat(Mat mat, ImageView imageView) {