OpenCV: Stack Vectors to Mat-CodePudding

I got 3 Vec3f and want to stack them to a 3x3 Matrix (C ). Is there a nice way to to so? In python its easy with numpy, however I dont know if there is a better way than assigin every single value from Vector to the corresponding Mat entry?

Cheers

CodePudding user response：

Yes you can. It depends on the precise packing arrangement that you want, but the simplest way is to simply copy their bytes into a properly sized Mat.

You access the bytes of a single Vec3f instance Vec3f v by using &v[0]. You access the bytes of a matrix Mat m by using m.data (not a function).

Here's an example:

cv::Mat m(3, 3, CV_32FC3);
cv::Vec3f vecs[3];
memcpy((void*)m.data, (const void*)&vecs[0][0], m.width * m.height * 3 * sizeof(float));