Hello Every body, I have a simple question. If the image is already grey scale image, do I still need to use cvtColor(img, gray, CV_BGR2GRAY) for further processing?
Thanks in advance.
in general, no.
but beware, the default flag for imread(img_path, flag) is CV_LOAD_IMAGE_COLOR(==1), so that would leave you with 3 identical channels, even if your img is 1-channel gray on disk.
to avoid that problem, call imread(path, CV_LOAD_IMAGE_GRAYSCALE) // or 0 for the flag
if you want a 1-channel img here
Asked: Apr 22 '13
Seen: 623 times
Last updated: Apr 22 '13
