Image transmission between processes too slow in python's multiprocessing
EDIT: I found this question, which has been answered, and addressed my problem using sharedmem module
I'm trying to send images (4000, 3000, 3) between two processes.
My first process acquires the image with a camera, attaches to it some metadata, another image and then sends the whole thing to the second process, which processes it.
I want to have a maximal delay of 0.2 seconds between the moment the image is acquired and the moment the processing is over.
Let's assume the way I acquire and process the image is optimal.
I tried 2 methods to send the image, with a queue (mp.Queue) and with a shared array (mp.Array('i', 4000*3000*3))
Both took to much time. 
The Queue.put() method takes about 0.5 seconds to send the package.
Copying the image in a shared array like this:
shared_array[:] = img.copy()
Takes about 2 seconds.
So my question is, is anyone aware of a faster way to transit two images between two processes?
Thanks for your time!