Get the minimum/maximum width/height of all the jpg images in current folder.

minmax_rc.py

#!/usr/bin/env python
from glob import glob                                                           
import cv2 

jpgs = glob('./*.jpg')
shapes = [cv2.imread(f).shape for f in jpgs]
a = [list(i) for i in shapes]
width = [row[1] for row in a]
height = [row[0] for row in a]
print 'width min:', min(width), ', max:', max(width), '; height min:', min(height), ', max:', max(height)