如何在没有内置函数的情况下在C ++中实现Filter2d Opencv？

Question

我在opencv c ++中实现了Filter2d的内置函数，我想在没有内置函数的情况下实现它，但我不能。这是我到目前为止所尝试过的。

int main(int argc, char** argv)
{

    /// Declare variables
    Mat src, dst, dsty;
    Mat kernelx, kernely;
    Point anchor;
    double delta;
    int ddepth;
    int kernel_size;

namedWindow("filter2D", CV_WINDOW_AUTOSIZE);

    src = imread("C:/Users/cvi/Desktop/2.jpg");

    /// Initialize arguments for the filter
    anchor = Point(-1, -1);
    delta = 0;
    ddepth = -1;

    kernel_size = 2;

    kernelx = Mat::ones(kernel_size, kernel_size, CV_32F) /
        (float)(kernel_size*kernel_size);
    kernely = Mat::ones(kernel_size, kernel_size, CV_32F) /
        (float)(kernel_size*kernel_size);

    kernelx.at<float>(0, 0) = -1;
    kernely.at<float>(0, 0) = 1;

    for (int i = 0; i < src.rows; ++i) {
        for (int j = 0; j < src.cols; ++j) {
            int tmp, sum;
            for (int m = 0; m < kernelx.rows; ++m) {
                for (int n = 0; n < kernely.cols; ++n) {
                    tmp = src[i + m - (kernel_size - 1) / 2][j + n - (kernel_size - 1) / 2];
                    float kernel_index = kernelx[m][n];
                    float index_mult = (float)index_mult * kernel_index;
                    sum = sum + index_mult;
                }
            }
            imshow("filter2D Change in X", dst);
            imshow("filter2D Change in Y", dsty);
        }
    }
    cvWaitKey(0);
    return 0;
}