擅长:python、mysql、java
<p>您可以使用numpy的切片:</p>
<pre><code>import cv2
import numpy as np
## read image as np.ndarray in BGR order
img = cv2.imread("test.png")
## use OpenCV function to split channels
b, g, r = cv2.split(img)
## use numpy slice to extract special channel
b = img[...,0]
g = img[...,1]
r = img[...,2]
</code></pre>