Running python multiprocess for Image processing

Question

I have a python function that takes in an image path and outputs true or false depending whether the image is black or not. I want to process several images on the same machine

Answer 1

I would suggest looking at Pools to easily create processes on the fly. If you need to have some shared state, in this case a boolean indicating a non-black image has been found, look at Managers.

Update: Here is an example of what I mean.

import multiprocessing.Manager as Manager
import multiprocessing.Pool as Pool

m = Manager()
p = Pool(processes=5)

state_info = m.dict()
state_info['image_found'] = False

def processImage(img):

    # ... Process Image ...

    if imageIsBlack(img):
        state_info['image_found'] = True
        p.terminate()

 p.apply(processImage, imageList)

 if state_info['image_found']:
     print 'There was a black image!!'
 else:
     print 'No black images were found.'