4-图像相加运算

图像相加

原理：相同大小的图片的对应像素值进行相加再与255进行取模运算

img = (img1 + img2) % 255   #像素值不超过255

• 直接加： img = img1 + img2或者 img = cv.add(img1, img2)

import cv2 as cv
import numpy as np

img1 = cv.imread(r'C:\Users\74452\Pictures\opencv\test1.jpg')
img2 = cv.imread(r'C:\Users\74452\Pictures\opencv\test2.jpg')
cv.imshow('img1', img1)
cv.imshow('img2', img2)

img = img1 + img2
cv.imshow('img',img)

cv.waitKey()
cv.destroyAllWindows()

• 权重相加： addWeighted(src1, alpha, src2, beta, gamma)

原理：

g(x,y) = src1*alpha + src2*beta + gamma

- alpha为第一张图src1的权重
- beta= 1 - alpha, 为第二张图src2的权重
- gamma控制所有像素值偏转度

import cv2 as cv
import numpy as np

img1 = cv.imread(r'C:\Users\74452\Pictures\opencv\test1.jpg')
img2 = cv.imread(r'C:\Users\74452\Pictures\opencv\test2.jpg')
cv.imshow('img1', img1)
cv.imshow('img2', img2)

img = cv.addWeighted(img1,0.8,img2,0.2, 0)
cv.imshow('img', img)


cv.waitKey()
cv.destroyAllWindows()