Do a small thing, some time ago in the OPENCV in sub-images used to extract and copy, for a time did not find a good way, either direct access to the assignment of pixels, either through the array to convert, and always feel awkward, and later got to know the a relatively simple method, you need to use the OPENCV in the ROI method, the method for grayscale or color images of any format

GetSubImagebyopencv.txt

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