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?
Access to each separate channel in OpenCV
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5 Answers
You can access a specific channel, it works faster than the split operation
Mat img(5,5,CV_64FC3);
Mat ch1;
int channelIdx = 0;
extractChannel(img, ch1, channelIdx); // extract specific channel
// or extract them all
vector<Mat> channels(3);
split(img, channels);
cout << channels[0].size() << endl;
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