public static Matrix ConvolveSobelY(Matrix matrix)
{
Matrix sobelKernel = new Matrix(3, 3);
sobelKernel[0, 0] = -1; sobelKernel[0, 1] = -2; sobelKernel[0, 2] = -1;
sobelKernel[2, 0] = 1; sobelKernel[2, 1] = 2; sobelKernel[2, 2] = 1;
return(MatrixUtils.Convolve(matrix, sobelKernel));
}