CODEWITHSUNDEEP
c++opencv3.1
lonewolf07
lonewolf07

Reputation: 51

portation: opencv 2.4.3 -> opencv 3.1., cvGetMat was not declared in this scope

I am currently trying to port a code which is based on opencv 2.x to opencv 3.x (higher than 3.1). Within this code a function, namely cvGetMat(...) is being used. Since this function doesn't exist in opencv 3.x, I need a proper replacement. Does anyone know, how to replace this function properly? I already looked for it both in the opencv documentation and here at stackoverflow but couldn't find anything.

Here's a snipped code segment using this function

void cvCanny3(  const void* srcarr, void* dstarr,
            void* dxarr, void* dyarr,
            int aperture_size )
{


CvMat srcstub, *src = cvGetMat( srcarr, &srcstub );
CvMat dststub, *dst = cvGetMat( dstarr, &dststub );

CvMat dxstub, *dx = cvGetMat( dxarr, &dxstub );
CvMat dystub, *dy = cvGetMat( dyarr, &dystub );
...
...
...
}

When I run this code I just get following error as expected:

‘cvGetMat’ was not declared in this scope CvMat srcstub, *src = cvGetMat( srcarr, &srcstub ); ^~~~~~~~

Upvotes: 0

Views: 1248

Answers (1)

Viktor Latypov
Viktor Latypov

Reputation: 14467

cvGetMat is from old C-based interface (it creates a CvMat object from raw C array), you should convert your code to newer C++ interface and make it use cv::Mat type (wrap your src_addr C array to C++ cv::Mat instance).

E.g., your call to cvGetMat should be replaced by cv::Mat variable declaration.

cv::Mat src(num_rows, num_cols, src_type, src_arr);

The num_rows, num_cols and src_type determine size and semantics of src_arr array. Probably, you will have to drop 'const' modifier on you src_arr input.

See cv::Mat reference for more details.

All the cvFunctionName calls usually have their C++ counterparts in 'cv::' namespace. E.g., cvRemap would become cv::remap etc.

Upvotes: 1

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