Incomplete type "cv::Mat" opencv c++

Question

I want to create a matrice in opencv for my project of raytracing. This is the code I have come up:

#include "Windows.h" #include "core/mat.hpp" #include "core/core.hpp" #include "core/types_c.h" using namespace cv; Mat createImage() { Mat b(480, 640, CV_8UC3); return b; }

And I have problem with the two Mat. It says variable has incomplete type "cv::Mat". I can't understand what it means. I always wrote only Mat nothing else.

Can someone help me please?

You should only include core.hpp, but is sounds like a linker error — Martin Beckett
– Martin Beckett, Commented Jan 9, 2014 at 21:39
I found a response on stackoverflow on how to link opencv with xcode, so I followed all the step. So does this linker error is something about xcode itself? — Ekica
– Ekica, Commented Jan 9, 2014 at 22:22
This looks more like a compiler error to me, not a linker output. — AlexK
– AlexK, Commented Jan 9, 2014 at 22:31
how do xcode and window.h go together ? sounds you made some general mess of it .. — berak
– berak, Commented Jan 9, 2014 at 22:57
start with readjusting your include path, so it points to opencv/build/include. try with only: #include "opencv2/core/core.hpp" , skip all other headers (especially the windows.h one). — berak
– berak, Commented Jan 9, 2014 at 23:00

Sagar Patel · Accepted Answer · 2015-08-17 09:40:18Z

Just include "opencv2/core/core.hpp".
You can use below example code.

#include "opencv2/core/core.hpp" using namespace cv; Mat createImage() { Mat b(480, 640, CV_8UC3); return b; } int main() { createImage(); }

Martin Beckett · Accepted Answer · 2014-01-09 22:56:04Z

You only need to '#include "core/core.hpp"`

The compiler needs to be able to find the include files, do you have Opencv/Include in the compiler's include directory list? Did it give any error about finding core.hpp?

I just included core/core.hpp and I had also to include type.hpp because CV_8UC3 is not in core.hpp and I still have this problem. :(

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