【OpenCV for Android】ガンマ補正

gammaFilter.java

    public synchronized Mat gammaFilter(Mat inputPicture) {
        Mat result = new Mat();
        inputPicture.copyTo(result);
            
        Mat lut = new Mat(1, 256, CvType.CV_8UC1);
        lut.setTo(new Scalar(0));
        double gamma = 3;

        for (int i = 0; i < 256; i++)
        {
         lut.put(0, i, Math.pow((double)(1.0 * i/255), gm) * 255);
        }
        Core.LUT(inputPicture, lut, result);
        return result;
    }