siebenhaarmi76624/MDT5_1_Ueberwachungssystem_G1
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Removed old Luminosity detection

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This commit is contained in:
Bastian Kohler 2023-05-28 22:28:23 +02:00
parent c5577b125f
commit 804c5aba36
1 changed files with 5 additions and 52 deletions
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57
app/src/main/java/com/example/ueberwachungssystem/VideoDetection/VideoDetector.java
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@ -3,7 +3,6 @@ package com.example.ueberwachungssystem.VideoDetection;
import android.content.Context;
import android.graphics.ImageFormat;
import android.media.Image;
import android.util.Log;
import android.util.Size;
import androidx.annotation.NonNull;
@ -32,12 +31,9 @@ public class VideoDetector extends Detector {
private Boolean isDetectionRunning = false;
// Preview Camera Image
private PreviewView previewView = null;
// Check Violation
private final float DELTA_LUMINOSITY_THRESHOLD = 1.5f;
private Float previousLuminosity = null;
private static final int PIXEL_THRESHOLD = 50; // Luminosity (brightness channel of YUV_420_888)
private static final int ALARM_THRESHOLD = 1; // Percent of pixels changed
// 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 ByteBuffer previousBuffer = null;
@ -101,23 +97,15 @@ public class VideoDetector extends Detector {
Image image = imageProxy.getImage();
assert image != null;
// Luminosity Detection
//float luminosity = calculateLuminosity(image);
//if (previousLuminosity != null)
// checkForViolation(luminosity, previousLuminosity);
//previousLuminosity = luminosity;
// Changed Pixel Detection
int pixelChanged = getChangedPixelCount(image);
int width = image.getWidth();
int height = image.getHeight();
float percentPixelChanged = (float) 100f * pixelChanged / (width * height);
if (percentPixelChanged > ALARM_THRESHOLD)
reportViolation("0", "Video", percentPixelChanged);
}
imageProxy.close();
});
@ -134,31 +122,6 @@ public class VideoDetector extends Detector {
}
/** Return Luminosity from Image */
private float calculateLuminosity (Image image) {
int width = image.getWidth();
int height = image.getHeight();
Image.Plane[] planes = image.getPlanes();
ByteBuffer luminosityBuffer = planes[0].getBuffer();
int yRowStride = image.getPlanes()[0].getRowStride();
int yPixelStride = image.getPlanes()[0].getPixelStride();
int luminosity;
float sum = 0;
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; x++) {
int index = (y * yRowStride) + (x * yPixelStride);
luminosity = (luminosityBuffer.get(index) & 0xff);
sum += luminosity;
}
}
return sum / (width * height);
}
/** Calculate Amount of Pixels changed */
private int getChangedPixelCount(Image image) {
int width = image.getWidth();
@ -177,6 +140,7 @@ public class VideoDetector extends Detector {
buffer.rewind();
previousBuffer.put(buffer);
previousBuffer.rewind();
return 0;
}
for (int y = 0; y < height; ++y) {
@ -196,15 +160,4 @@ public class VideoDetector extends Detector {
return changedPixelCount;
}
/** Check if delta Luminosity exceeds threshold */
private void checkForViolation(float luminosity, float previousLuminosity) {
float deltaLuminosity = Math.abs(luminosity - previousLuminosity);
if (deltaLuminosity > DELTA_LUMINOSITY_THRESHOLD) {
reportViolation("0", "Video",luminosity);
Log.d("Violation", "Violation");
}
Log.d("Delta", String.valueOf(Math.abs(previousLuminosity - luminosity)));
}
}