Example usage for org.opencv.core MatOfPoint clone

Introduction

In this page you can find the example usage for org.opencv.core MatOfPoint clone.

Prototype

public Mat clone() 

Source Link

Usage

From source file:eu.fpetersen.robobrain.behavior.followobject.ColorBlobDetector.java

License:Open Source License

public void process(Mat rgbaImage) {
    Imgproc.pyrDown(rgbaImage, mPyrDownMat);
    Imgproc.pyrDown(mPyrDownMat, mPyrDownMat);

    Imgproc.cvtColor(mPyrDownMat, mHsvMat, Imgproc.COLOR_RGB2HSV_FULL);

    Core.inRange(mHsvMat, mLowerBound, mUpperBound, mMask);
    Imgproc.dilate(mMask, mDilatedMask, new Mat());

    List<MatOfPoint> contours = new ArrayList<MatOfPoint>();

    Imgproc.findContours(mDilatedMask, contours, mHierarchy, Imgproc.RETR_EXTERNAL,
            Imgproc.CHAIN_APPROX_SIMPLE);

    // Find max contour area
    maxArea = 0;//w  w  w  .  jav a 2 s  .  com
    Iterator<MatOfPoint> each = contours.iterator();
    Mat biggestContour = null;
    while (each.hasNext()) {
        MatOfPoint wrapper = each.next();
        double area = Imgproc.contourArea(wrapper);
        if (area > maxArea) {
            maxArea = area;
            biggestContour = wrapper.clone();
        }
    }
    if (biggestContour != null) {
        Core.multiply(biggestContour, new Scalar(4, 4), biggestContour);
        Moments mo = Imgproc.moments(biggestContour);
        centroidOfMaxArea = new Point(mo.get_m10() / mo.get_m00(), mo.get_m01() / mo.get_m00());
    } else {
        centroidOfMaxArea = null;
    }

    // Filter contours by area and resize to fit the original image size
    mContours.clear();
    each = contours.iterator();
    while (each.hasNext()) {
        MatOfPoint contour = each.next();
        if (Imgproc.contourArea(contour) > mMinContourArea * maxArea) {
            Core.multiply(contour, new Scalar(4, 4), contour);
            mContours.add(contour);
        }
    }

    Imgproc.drawContours(rgbaImage, mContours, -1, CONTOUR_COLOR);
}

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