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    @Override
public void onCameraViewStarted(int width, int height) {
    //4 channel
    mRgba = new Mat(width, height, CvType.CV_8UC4);
    mHsv = new Mat(width, height, CvType.CV_8UC3);
}

    @Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
    //get each frame from camera
    mRgba = inputFrame.rgba();


    /**********HSV conversion**************/
    //convert mat rgb to mat hsv
    Imgproc.cvtColor(mRgba, mHsv, Imgproc.COLOR_RGB2HSV);

    //find scalar sum of hsv
    Scalar mColorHsv = Core.sumElems(mHsv);

    int pointCount = 320*240;


    //convert each pixel
    for (int i = 0; i < mColorHsv.val.length; i++) {
        mColorHsv.val[i] /= pointCount;
    }

    //convert hsv scalar to rgb scalar
    Scalar mColorRgb = convertScalarHsv2Rgba(mColorHsv);

    /*Log.d("intensity", "Color: #" + String.format("%02X", (int)mColorHsv.val[0])
            + String.format("%02X", (int)mColorHsv.val[1])
            + String.format("%02X", (int)mColorHsv.val[2]) );*/
    //print scalar value
    Log.d("intensity", "R:"+ String.valueOf(mColorRgb.val[0])+" G:"+String.valueOf(mColorRgb.val[1])+" B:"+String.valueOf(mColorRgb.val[2]));


    /*Convert to YUV*/

    int R = (int) mColorRgb.val[0];
    int G = (int) mColorRgb.val[1];
    int B = (int) mColorRgb.val[2];

    int Y = (int) (R *  .299000 + G *  .587000 + B *  .114000);
    int U = (int) (R * -.168736 + G * -.331264 + B *  .500000 + 128);
    int V = (int) (R *  .500000 + G * -.418688 + B * -.081312 + 128);

    //int I = (R+G+B)/3;


    //Log.d("intensity", "I: "+String.valueOf(I));
    Log.d("intensity", "Y:"+ String.valueOf(Y)+" U:"+String.valueOf(U)+" V:"+String.valueOf(V));

    /*calibration*/



    return mRgba;

}



//convert Mat hsv to scalar
private Scalar convertScalarHsv2Rgba(Scalar hsvColor) {
    Mat pointMatRgba = new Mat();
    Mat pointMatHsv = new Mat(1, 1, CvType.CV_8UC3, hsvColor);
    Imgproc.cvtColor(pointMatHsv, pointMatRgba, Imgproc.COLOR_HSV2RGB);

    return new Scalar(pointMatRgba.get(0, 0));
}

    @Override
public void onCameraViewStarted(int width, int height) {
    //4 channel
    mRgba = new Mat(width, height, CvType.CV_8UC4);
    mHsv = new Mat(width, height, CvType.CV_8UC3);
}

    @Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
    //get each frame from camera
    mRgba = inputFrame.rgba();


    /**********HSV conversion**************/
    //convert mat rgb to mat hsv
    Imgproc.cvtColor(mRgba, mHsv, Imgproc.COLOR_RGB2HSV);

    //find scalar sum of hsv
    Scalar mColorHsv = Core.sumElems(mHsv);

    int pointCount = 320*240;


    //convert each pixel
    for (int i = 0; i < mColorHsv.val.length; i++) {
        mColorHsv.val[i] /= pointCount;
    }

    //convert hsv scalar to rgb scalar
    Scalar mColorRgb = convertScalarHsv2Rgba(mColorHsv);

    /*Log.d("intensity", "Color: #" + String.format("%02X", (int)mColorHsv.val[0])
            + String.format("%02X", (int)mColorHsv.val[1])
            + String.format("%02X", (int)mColorHsv.val[2]) );*/
    //print scalar value
    Log.d("intensity", "R:"+ String.valueOf(mColorRgb.val[0])+" G:"+String.valueOf(mColorRgb.val[1])+" B:"+String.valueOf(mColorRgb.val[2]));


    /*Convert to YUV*/

    int R = (int) mColorRgb.val[0];
    int G = (int) mColorRgb.val[1];
    int B = (int) mColorRgb.val[2];

    int Y = (int) (R *  .299000 + G *  .587000 + B *  .114000);
    int U = (int) (R * -.168736 + G * -.331264 + B *  .500000 + 128);
    int V = (int) (R *  .500000 + G * -.418688 + B * -.081312 + 128);

    //int I = (R+G+B)/3;


    //Log.d("intensity", "I: "+String.valueOf(I));
    Log.d("intensity", "Y:"+ String.valueOf(Y)+" U:"+String.valueOf(U)+" V:"+String.valueOf(V));

    /*calibration*/



    return mRgba;

}



//convert Mat hsv to scalar
private Scalar convertScalarHsv2Rgba(Scalar hsvColor) {
    Mat pointMatRgba = new Mat();
    Mat pointMatHsv = new Mat(1, 1, CvType.CV_8UC3, hsvColor);
    Imgproc.cvtColor(pointMatHsv, pointMatRgba, Imgproc.COLOR_HSV2RGB);

    return new Scalar(pointMatRgba.get(0, 0));
}