convert openCV image into PIL Image in Python (for use with Zbar library)

Question

I\'m trying to use the Zbar library\'s QR code detection methods on images I extract with OpenCV\'s camera methods. Normally the QR code detection methods work with images (jpg,

Answer 1

Are you trying to obtain a RGB image? If that is the case, you need to change your parameters from this:

cv_im = cv.CreateImage((320,200), cv.IPL_DEPTH_8U, 1)
pi = Image.fromstring("L", cv.GetSize(cv_im), cv_im.tostring())

to that:

cv_im = cv.CreateImage((320,200), cv.IPL_DEPTH_8U, 3)
pi = Image.fromstring("RGB", cv.GetSize(cv_im), cv_im.tostring())

since it is documented almost nowhere, but the 'L' parameter of Image.fromstring is for 8-bit B&W images. Besides, you need to change the argument of your cv.CreateImage function from 1 (single channel image) to 3 (3 channels=RGB).

Hope it works for you. Cheers