IAmSuyogJadhav

import cv2

image = cv2.imread('test.jpg')
overlay = image.copy()

x, y, w, h = 10, 10, 10, 10  # Rectangle parameters
cv2.rectangle(overlay, (x, y), (x+w, y+h), (0, 200, 0), -1)  # A filled rectangle

alpha = 0.4  # Transparency factor.

nfaggian

from __future__ import print_function

import multiprocessing
import ctypes
import numpy as np

def shared_array(shape):
    """
    Form a shared memory numpy array.