Question

I have 3 matrices (R G B) in double precision format, so all I need is OpenCV version of matlab cat function to display image. If you have any sources or references please post, I would be grateful.

Answer 1

There is merge() for such tasks. I’m assuming that you’re using C++ for the following example code, but this function is available for C and Python too (see docs).

// Suppose you have 3 matrices (instances of class cv::Mat)
// named channelR, channelG and channelB that hold your data
std::vector<cv::Mat> channels;
channels.push_back(channelR);
channels.push_back(channelG);
channels.push_back(channelB);

cv::Mat outputImage;
merge(channels, outputImage);