OpenCv2.2 C++ filter2D

Question

I'm transfering matlab code to c++ using OpenCv2.2, In a function (conv2) that is made to be similar to the matlab one, I use filter2D that comes from

#include <opencv2/imgproc/imgproc.hpp>

the problem is the error message that I get :

OpenCV Error: The function/feature is not implemented (Unsupported combination of source format (=4), and destination format (=4)) in getLinearFilter, file C:\\opencv\\sources\\modules\\imgproc\\src\\filter.cpp, line 3234

terminate called after throwing an instance of 'cv::Exception'

what(): C:\\opencv\\sources\\modules\\imgproc\\src\\filter.cpp:3234: error: (-213) Unsupported combination of source format (=4), and destination format (=4) in function getLinearFilter

It's the first time that i see an error like this one. So, i don't realy know if this comes from my instal or from the code.

============================================================================================ Annexe :

Code :

void conv2(const Mat &img, const Mat& kernel, ConvolutionType type, Mat& dest)
{
    // fonction trouvée sur le site :
    // http://blog.timmlinder.com/2011/07/opencv-equivalent-to-matlabs-conv2-function/
    // par  Timm Linder le 05/07/2011
  Mat source = img;
  if(CONVOLUTION_FULL == type) {
    source = Mat();
    const int additionalRows = kernel.rows-1, additionalCols = kernel.cols-1;
    copyMakeBorder(img, source, (additionalRows+1)/2, additionalRows/2, (additionalCols+1)/2, additionalCols/2, BORDER_CONSTANT, Scalar(0));
  }

  Point anchor(kernel.cols - kernel.cols/2 - 1, kernel.rows - kernel.rows/2 - 1);
  int borderMode = BORDER_CONSTANT;

  filter2D(source, dest, img.depth(), flip(kernel), anchor, 0, borderMode);

  //cvFilter2D(source, dest, img.depth(), flip(kernel), anchor, 0, borderMode);

  if(CONVOLUTION_VALID == type) {
    dest = dest.colRange((kernel.cols-1)/2, dest.cols - kernel.cols/2)
               .rowRange((kernel.rows-1)/2, dest.rows - kernel.rows/2);
  }
}

found on this blog : http://blog.timmlinder.com/2011/07/opencv-equivalent-to-matlabs-conv2-function/ (If some one have bether idear to reproduce the conv2 that could be intresting)

Answer 1

looking at the filter2d docs , - it's obvious that you can't work with int32 Mats (type()==4).

you'll have to convert to one of CV_8U,CV_16U,CV_32F,CV_64F

(also consider updating your opencv. 2.2 is quite old)