用于多处理的 Python OpenCV 加速

Question

我正在尝试在来自网络摄像头的实时提要上运行我的图像处理算法。我希望它在多处理模块的并行进程中运行，我该如何实现？这是我当前没有并行编码的代码：

from cv2 import VideoCapture , imshow , waitKey ,imwrite

import numpy as np

from time import time

def greenify (x):

    return some_value

skip = 4

video = VideoCapture(0)

video.set(3,640/skip)

video.set(4,480/skip)

total = 0

top_N = 100

while True:

    image = video.read()[1]        

    if waitKey(1) == 27:

        break

    arr = array([list(map(greenify,j)) for j in image])

    result = unravel_index(argpartition(arr,arr.size-top_N,axis=None)[-top_N:], arr.shape)

    centre = skip*np.median(result[0]) , skip*np.median(result[1])

    imshow('Feed', image)

print('Time taken:',total)

video.release()