I have an image with 3 channels (img) and another one with a single channel (ch1).
Mat img(5,5,CV_64FC3);
Mat ch1 (5,5,CV_64FC1);
Is there any efficient way (not using for loop) to copy the first channel of img to ch1?
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There is a function called cvMixChannels. You’ll need to see implementation in the source code, but I bet it is well optimized.