issues in capture_and_detect.py script.

[SamiurRahman1]

There are probably some mistakes in the script. The error i get when trying to get the frames from a video using the script, it doesn't generate the processed images. When the code tries to do this:
if np.mean(np.abs(now_im-former_im))>5:
it throws an error which says, mow_im and former _im are "NoneTypes" and we can not use an operand on them, which makes sense.
The former_im and now_im is declared/derived like this:
former_im = cv2.imread(dest_dir_processed+"%d/1.jpg"%i)
so, i don't think they are numbers. so why are we trying to do "former_im - now_im"?
Any idea how to fix this problem?