Python利用Opencv对图片合成的方法

由于需要，现在需要对两张图片进行合成，一张是原图，一张是无水印的图

在几篇博客中找到的几种方法

https://blog.csdn.net/huanglu_thu13/article/details/52346286

https://blog.csdn.net/qq_31133609/article/details/51615835

都没有达到想要的效果，图片的亮度降低

最终在一篇博客中发现opencv支持对像素点的位运算 代码来自https://blog.csdn.net/poi7777/article/details/39891407

代码如下

import cv2
# 加载图片
img1 = cv2.imread('yuan.jpg')  
img2 = cv2.imread('hb.png')  
  
# I want to put logo on top-left corner, So I create a ROI  
rows,cols,channels = img2.shape  
roi = img1[0:rows, 0:cols ]  
  
# Now create a mask of logo and create its inverse mask also  
img2gray = cv2.cvtColor(img2,cv2.COLOR_BGR2GRAY)  
ret, mask = cv2.threshold(img2gray, 10, 255, cv2.THRESH_BINARY)  
mask_inv = cv2.bitwise_not(mask)  
  
# Now black-out the area of logo in ROI  
img1_bg = cv2.bitwise_and(roi,roi,mask = mask_inv)  
  
# Take only region of logo from logo image.  
img2_fg = cv2.bitwise_and(img2,img2,mask = mask)  
  
# Put logo in ROI and modify the main image  
dst = cv2.add(img1_bg,img2_fg)  
img1[0:rows, 0:cols ] = dst  
  
cv2.imshow('res',img1)
cv2.imwrite('blend.jpg',img1)
cv2.waitKey(0)  
cv2.destroyAllWindows()