cv::Mat MotionBlur(cv::Mat srcImg, int filterSize) {

     int size = filterSize;

     cv::Mat filter = cv::Mat::zeros(size, size, CV_8UC1);

     cv::Mat result = cv::Mat(srcImg.size(), srcImg.type());

     for (int i = ; i < size; i++)filter.at<uchar>(i, i) = (uchar);

     for (int i = ; i < filter.rows; i++) {

         for (int j = ; j < filter.cols; j++) {

             cout << (int)filter.at<uchar>(i, j) << " ";

         }

         cout << endl;

     }

     int len = size / ;

     for (int r = ; r < srcImg.rows; r++) {

         for (int c = ; c < srcImg.cols; c++) {

             //mask

             int red = , green = , blue = ;

             for (int i = r - len; i <= r + len; i++) {

                 for (int j = c - len; j <= c + len; j++) {

                     if (i <  || j <  || i >= srcImg.rows || j >= srcImg.cols) continue;

                     blue += ((int)srcImg.at<cv::Vec3b>(i, j)[]) * ((int)filter.at<uchar>(i - (r - len), j - (c - len)));

                     green += ((int)srcImg.at<cv::Vec3b>(i, j)[]) * ((int)filter.at<uchar>(i - (r - len), j - (c - len)));

                     red += ((int)srcImg.at<cv::Vec3b>(i, j)[]) * ((int)filter.at<uchar>(i - (r - len), j - (c - len)));

                 }

             }

             result.at<cv::Vec3b>(r, c)[] = (uchar)(blue / size);

             result.at<cv::Vec3b>(r, c)[] = (uchar)(green / size);

             result.at<cv::Vec3b>(r, c)[] = (uchar)(red / size);

         }

     }

     cv::imshow("motion blur", result);

     cv::waitKey();

     return result;

 }