How Do I Solve Here, Mat Planes[] = {Mat_(Padded), Mat::Zeros(Padded.Size(), Cv_32F )};I Used Break Point , Can You Tell Me What I Need To Here.

void CannyThreshold(int, void*)
{
  /// Reduce noise with a kernel 3x3
  blur( src_gray, detected_edges, Size(3,3) );

  /// Canny detector
  Canny( detected_edges, detected_edges, lowThreshold, lowThreshold*ratio, kernel_size );

  /// Using Canny's output as a mask, we display our result
  dst = Scalar::all(0);

  src.copyTo( dst, detected_edges);
  imshow( window_name, dst );
  
  /// Wait until user exit program by pressing a key


    int m = getOptimalDFTSize( dst.rows );
    int n = getOptimalDFTSize( dst.cols ); // on the border add zero values
   copyMakeBorder(dst, padded, 0, m - dst.rows, 0, n - dst.cols, BORDER_CONSTANT, Scalar::all(0));

    Mat planes[] = {Mat_<float>(padded), Mat::zeros(padded.size(), CV_32F)};
    Mat complexdst;
    merge(planes, 2, complexdst);         // Add to the expanded another plane with zeros

    dft(complexdst, complexdst);            // this way the result may fit in the source matrix