Hi everyone! I use code like this. I want to identify each object that detect from video for tracking each object I want to know position(x,y) of each object. How can I do? Please help me. Thank a lot.
public class MotionDetection {
static int SENSITIVITY_VALUE = 30;
static int BLUR_SIZE = 5;
static int WIDTH = 640;
static int HEIGHT = 480;
static int count = 0;
static OpenCVWindow thresholdWindow;
static OpenCVWindow drawnWindow;
//static OpenCVWindow testWindow;
public static void main(String[] args) {
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
thresholdWindow = new OpenCVWindow(WIDTH, HEIGHT);
drawnWindow = new OpenCVWindow(WIDTH, HEIGHT);
//testWindow = new OpenCVWindow(WIDTH, HEIGHT);
readFromCamera();
}
static void readFromCamera() {
while (true) {
VideoCapture camera = new VideoCapture("D:\\Videos\\side.mp4");
if (!camera.isOpened()) {
System.out.println("Cannot open file");
} else {
Mat previousFrame = new Mat();
Mat currentFrame = new Mat();
Mat grayImage1 = new Mat();
Mat grayImage2 = new Mat();
Mat differenceImage = new Mat();
Mat thresholdImage = new Mat();
boolean frameSuccess;
// THE INFINITE LOOP
camera.read(previousFrame);
Imgproc.resize(previousFrame, previousFrame, new Size(WIDTH, HEIGHT));
Imgproc.cvtColor(previousFrame, grayImage1,
Imgproc.COLOR_BGR2GRAY);
while (true) {
frameSuccess = camera.read(currentFrame);
if (frameSuccess == true) {
Imgproc.resize(currentFrame, currentFrame, new Size(WIDTH, HEIGHT));
Imgproc.cvtColor(currentFrame, grayImage2,
Imgproc.COLOR_BGR2GRAY);
} else {
break;
}
// DIFFERENCE
Core.absdiff(grayImage1, grayImage2, differenceImage);
Imgproc.threshold(differenceImage, thresholdImage,
SENSITIVITY_VALUE, 255, Imgproc.THRESH_BINARY);
Imgproc.blur(thresholdImage, thresholdImage, new Size(
BLUR_SIZE, BLUR_SIZE));
//Imgproc.medianBlur(thresholdImage, thresholdImage,1);
Imgproc.threshold(thresholdImage, thresholdImage,
SENSITIVITY_VALUE, 255, Imgproc.THRESH_BINARY);
thresholdWindow.showImage(thresholdImage);
searchForMovement(thresholdImage, currentFrame);
//Previous frame is now this frame
grayImage2.copyTo(grayImage1);
}
camera.release();
}
}
}
static void searchForMovement(Mat thresholdImage, Mat frame) {
List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
Mat hierarchy = new Mat();
Imgproc.findContours(thresholdImage, contours, hierarchy,
Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
Rect objectBoundingRectangle = new Rect(0, 0, 0, 0);
for (int i = 0; i < contours.size(); i++) {
objectBoundingRectangle = Imgproc.boundingRect(contours.get(i));
if (objectBoundingRectangle.area() > 25 & objectBoundingRectangle.area() < 100 ) {
Core.rectangle(frame, objectBoundingRectangle.tl(), objectBoundingRectangle.br(), new Scalar(0,255,0));
}
}
drawnWindow.showImage(frame);
}
In this code, I know a lot of position(x,y) of all object.
