如何在 python 中使用 opencv 提取绿色通道？

Question

为了从 RGB 图像中提取绿色通道，我已经完成了以下代码，但这不起作用

import cv2
green_image = cv2.imread('eye.jpg')
green_image[:,:,0] = 0
green_image[:,:,2] = 0
cv2.imshow('G-RGB', green)
cv2.waitKey(0)

代码出现错误：

TypeError

   1 import cv2
   2 green_image = cv2.imread('eye.jpg')
-->3 green_image[:,:,0] = 0
   4 green_image[:,:,2] = 0
   5 cv2.imshow('G-RGB', green)

TypeError: 'NoneType' object does not support item assignment

Answer 1

改变这个

cv2.imshow('G-RGB', green)

到

cv2.imshow('G-RGB', green_image)

因此：

import cv2
rgb_image = cv2.imread('eye.jpg')
green_image = rgb_image.copy()
green_image[:,:,0] = 0
green_image[:,:,2] = 0
cv2.imshow('G-RGB', green_image)
cv2.waitKey(0)

输出：

Answer 2

您可以使用cv2.split来分割蓝色、绿色和红色通道。

import cv2
img = cv2.imread('eye.jpg')
b, g, r = cv2.split(img)
cv2.imshow('green', g)
cv2.waitKey(0)

如何在 python 中使用 opencv 提取绿色通道？

How to extract green channel using opencv in python?

python

extraction

opencv3.0