message: canny: disallow broken inplace arguments
diff: @@ -972,6 +972,9 @@ void Canny( InputArray _src, OutputArray _dst,
  const Size size = _src.size();
  + // we don't support inplace parameters in case with RGB/BGR src
  + CV_Assert((_dst.getObj() != _src.getObj() || _src.type() == CV_8UC1) && "Inplace parameters are not supported");
  +
  _dst.create(size, CV_8U);
  if (!L2gradient && (aperture_size & CV_CANNY_L2_GRADIENT) == CV_CANNY_L2_GRADIENT)
  