在python中使用OpenCV分割图像
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Splitting Image using OpenCV in python
提问by Sagar
I have aN image and want to split it into three RGB channel images using CV2 in python.
我有一个图像，想在 python 中使用 CV2 将其拆分为三个 RGB 通道图像。
I also want the good documentation where i can find the all function of openCV as I am new to OpenCV completely.
我还想要很好的文档，我可以在其中找到 openCV 的所有功能，因为我完全是 OpenCV 的新手。
采纳答案by jabaldonedo
That is as simple as loading an image using cv2.imreadand then use cv2.split:
这就像使用cv2.imread然后使用加载图像一样简单cv2.split：
>>> import cv2
>>> import numpy as np
>>> img = cv2.imread("foo.jpg")
>>> b,g,r = cv2.split(img)
OpenCV documentation is available from docs.opencv.org
OpenCV 文档可从docs.opencv.org 获得
回答by Mohit Motwani
As mentioned in the documentation tutorial, the cv2.split() is a costly operation in terms of performance(time) so the numpy indexing is preferred:
正如文档教程中所提到的，cv2.split() 在性能（时间）方面是一项代价高昂的操作，因此首选 numpy 索引：
import cv2
import numpy as np
img = cv2.imread("foo.jpg")
b = img[:,:,0]
g = img[:,:,1]
r = img[:,:,2]
Remember that opencv reads the images as BGR instead of RGB
请记住，opencv 将图像读取为 BGR 而不是 RGB
