Examples with MinMaxLocResult org.opencv.core.Core.MinMaxLocResult used on opensource projects

Example 1 with MinMaxLocResult

use of org.opencv.core.Core.MinMaxLocResult in project opentest by mcdcorp.

the class ImageFinder method findImage.

private ImageFinderResult findImage(Mat sourceMat, Mat templateMat, double desiredAccuracy) {
    if (sourceMat.width() < templateMat.width() || sourceMat.height() < templateMat.height()) {
        throw new UnsupportedOperationException("The template image is larger than the source image. Ensure that the width and/or height of the image you are trying to find do not exceed the dimensions of the source image.");
    }
    Mat result = new Mat(sourceMat.rows() - templateMat.rows() + 1, sourceMat.rows() - templateMat.rows() + 1, CvType.CV_32FC1);
    int intMatchingMethod;
    switch(this.matchingMethod) {
        case MM_CORELLATION_COEFF:
            intMatchingMethod = Imgproc.TM_CCOEFF_NORMED;
            break;
        case MM_CROSS_CORELLATION:
            intMatchingMethod = Imgproc.TM_CCORR_NORMED;
            break;
        default:
            intMatchingMethod = Imgproc.TM_SQDIFF_NORMED;
    }
    Imgproc.matchTemplate(sourceMat, templateMat, result, intMatchingMethod);
    MinMaxLocResult minMaxLocRes = Core.minMaxLoc(result);
    double accuracy = 0;
    Point location = null;
    if (this.matchingMethod == MatchingMethod.MM_SQUARE_DIFFERENCE) {
        accuracy = 1 - minMaxLocRes.minVal;
        location = minMaxLocRes.minLoc;
    } else {
        accuracy = minMaxLocRes.maxVal;
        location = minMaxLocRes.maxLoc;
    }
    if (accuracy < desiredAccuracy) {
        throw new ImageNotFoundException(String.format("Failed to find template image in the source image. The accuracy was %.2f and the desired accuracy was %.2f", accuracy, desiredAccuracy), new Rectangle((int) location.x, (int) location.y, templateMat.width(), templateMat.height()), accuracy);
    }
    if (!minMaxLocResultIsValid(minMaxLocRes)) {
        throw new ImageNotFoundException("Image find result (MinMaxLocResult) was invalid. This usually happens when the source image is covered in one solid color.", null, null);
    }
    Rectangle foundRect = new Rectangle((int) location.x, (int) location.y, templateMat.width(), templateMat.height());
    return new ImageFinderResult(foundRect, accuracy);
}