Android OpenCv image matching &a

• Import OpenCV to android, may refer here.
• Method to return Core.MinMaxLocResult:

    Core.MinMaxLocResult getMinMaxLocResult(Mat img, Mat temp) {

        String prefix = "GetMinMaxLocResult: ";

        if (!img.empty()) {
            Log.v(TAG, prefix + "Load source image succeed.");
        } else {
            Log.e(TAG, prefix + "Fail to load source image !!!");
            Assert.fail(prefix + "Fail to load source image !!!");
        }

        if (!temp.empty()) {
            Log.v(TAG, prefix + "Load source image succeed.");
        } else {
            Log.e(TAG, prefix + "Fail to load source image !!!");
            Assert.fail(prefix + "Fail to load source image !!!");
        }

        int cols = img.cols() - temp.cols();
        int rows = img.rows() - temp.rows();
        Mat res = new Mat(rows, cols, CvType.CV_32FC1);
        Mat imgGray = new Mat();
        Imgproc.cvtColor(img, imgGray, Imgproc.COLOR_RGB2GRAY);

        Imgproc.matchTemplate(imgGray, temp, res, Imgproc.TM_CCOEFF_NORMED);

        return Core.minMaxLoc(res);

    }

• Method to check whether match or not:

    boolean match(Core.MinMaxLocResult mmr) {

        String prefix = "Match: ";
        double bestMatch = mmr.maxVal;
        Log.d(TAG, prefix + "Currently the best match percentage is '" + bestMatch + "'.");
        if (mmr.maxVal >= threshold) {
            Log.d(TAG, prefix + "Match percentage is above the THRESHOLD.");
            return true;
        } else {
            Log.w(TAG, prefix + "Match percentage is below the THRESHOLD!!!");
            return false;
        }

    }

• Method to click on the center point of the match (if there is a match found):

    void clickOnMatch(Core.MinMaxLocResult mmr, Mat temp) {

        String prefix = "ClickOnMatch: ";
        double cols = temp.cols();
        double rows = temp.rows();
        Point center = new Point(mmr.maxLoc.x + cols / 2, mmr.maxLoc.y + rows / 2);
        int x = (int) center.x;
        int y = (int) center.y;
        Log.d(TAG, prefix + "Will click at matched image center '" + x + ", " + y + "'.");
        device.click(x, y);

    }

• Apply these methods:

bmp = methods.takeBitmapScreenshot();
Mat mat = methods.convertBitmapToPng(bmp);
Core.MinMaxLocResult mmr = methods.getMinMaxLocResult(mat, temp);
if (methods.match(mmr)) {
  Log.d(TAG, prefix + "Found a match of button 'Mini-Game'.");
  Log.i(TAG, prefix + "Will try to click at the center of the match.");
  methods.clickOnMatch(mmr, temp);
} else {
  Log.d(TAG, prefix + "Not found any match of button 'Mini-Game'.");
}