使用 OpenCv Python 将 RGB 图像分割为 RGB

Question

当我分割图像时，我没有得到红色、绿色、蓝色颜色的框架。我输出的帧是三个灰色图像。

import numpy as np
import cv2
img=cv2.imread("C:\\Users\\Pavan\\Desktop\\bird.jpg")
#display an image
cv2.imshow('image',img)
b,g,r=cv2.split(img)
cv2.imshow('b',b)
cv2.imshow('g',g)
cv2.imshow('r',r)
cv2.waitKey(0)
cv2.destroyAllWindows()

Answer 1

在 Python/OpenCV/Numpy 中，有两种方法可以实现这一点。

Method 1 is to copy the image 3 times and set the appropriate other channels to black

Method 2 is to split the image merge each with a black image for the other channels (suggested in comments by Mark Setchell)

输入：

import cv2
import numpy as np

img = cv2.imread('mandril3.jpg')

# Method 1: copy image and set other channels to black
r = img.copy()
r[:,:,0] = r[:,:,1] = 0

g = img.copy()
g[:,:,0] = g[:,:,2] = 0

b = img.copy()
b[:,:,1] = b[:,:,2] = 0

cv2.imshow("red",r)
cv2.imshow("green",g)
cv2.imshow("blue",b)
cv2.waitKey(0)
cv2.destroyAllWindows()


# Method 2: split channels and merge with black channels
b,g,r = cv2.split(img)
k = np.zeros_like(b)
b = cv2.merge([b,k,k])
g = cv2.merge([k,g,k])
r = cv2.merge([k,k,r])

cv2.imshow("red",r)
cv2.imshow("green",g)
cv2.imshow("blue",b)
cv2.waitKey(0)
cv2.destroyAllWindows()

# save results
cv2.imwrite("mandril3_red.jpg", r)
cv2.imwrite("mandril3_green.jpg", g)
cv2.imwrite("mandril3_blue.jpg", b)

红色的：

绿色的：

蓝色的：