OpenCV图片相减Java

    /**
     * 对两个RGB图像做减法操作
     * @param mat1
     * @param mat2
     * @return Mat类
     */
 public Mat minusRGBMat(Mat mat1, Mat mat2){ //mat1-mat2
        int height=mat1.rows();
        int width=mat1.cols();
        int channels=mat1.channels();
        byte[] values1= new byte[height*width*channels];
        byte[] values2= new byte[height* width*channels];
        mat1.get(0,0,values1);
        mat2.get(0,0,values2);
        Mat desMat = new Mat(mat1.rows(), mat1.cols() , CV_8UC4);
        for(int i=0; i<values1.length;i++){
            if(((values1[i]&0xff)-(values2[i]&0xff))<0){
                values1[i]= (byte) ((values1[i]&0xff)%(values2[i]&0xff));  
            }else {
                values1[i]= (byte) ((values1[i]&0xff)-(values2[i]&0xff));
            }
        }
        desMat.put(0,0,values1);
        return desMat;
    }