cvGetCol throwing “OpenCV: Unrecognized or unsupported array type”

Question

I'm trying to manipulate individual columns using OpenCV3 (Emgu) in c#. I have code that is similar to:

UMat Image = loaded image
UMat Column = new UMat();

CvInvoke.cvGetCol(Image, Column, 1);

{"OpenCV: Unrecognized or unsupported array type"}

And that is throwing the error in the header. I have tried Mat and Mat.Ptr instead of UMat , but nothing helps. While I have found 1-2 c++ examples, I cannot find ac# example to help.

Answer 1

While not the solution to this issue, I was able to get similar functionality using the Matrix<> type instead of UMats.

UMat Image = ...
Matrix<byte> ImageMatrix = new Matrix<byte>(Image.Rows, Image.Cols, 3);
Image.CopyTo(ImageMatrix);

ImageMatrix.GetCol(1);

I believe this will be slower than using the CvInvoke calls with UMat types, but it works while looking for a complete solution to the above issue.