private static void ConvertColor(IInputArray src, IOutputArray dest, Type srcColor, Type destColor, int dcn, Size size, Stream stream) { try { // if the direct conversion exist, apply the conversion CudaInvoke.CvtColor(src, dest, CvToolbox.GetColorCvtCode(srcColor, destColor), dcn, stream); } catch { try { //if a direct conversion doesn't exist, apply a two step conversion //in this case, needs to wait for the completion of the stream because a temporary local image buffer is used //we don't want the tmp image to be released before the operation is completed. using (CudaImage <Bgr, TDepth> tmp = new CudaImage <Bgr, TDepth>(size)) { CudaInvoke.CvtColor(src, tmp, CvToolbox.GetColorCvtCode(srcColor, typeof(Bgr)), 3, stream); CudaInvoke.CvtColor(tmp, dest, CvToolbox.GetColorCvtCode(typeof(Bgr), destColor), dcn, stream); stream.WaitForCompletion(); } } catch (Exception excpt) { throw new NotSupportedException(String.Format( "Conversion from CudaImage<{0}, {1}> to CudaImage<{2}, {3}> is not supported by OpenCV: {4}", srcColor.ToString(), typeof(TDepth).ToString(), destColor.ToString(), typeof(TDepth).ToString(), excpt.Message)); } } }