python中opencv图像叠加、图像融合、按位操作的具体实现

import cv2
import numpy as np

x = np.uint8([250])
y = np.uint8([10])

print( cv2.add(x,y) ) # 250+10 = 260 => 255
print( x+y )          # 250+10 = 260 % 256 = 4

import cv2
import numpy as np

img1 = cv2.imread('img.jpg')
img2 = cv2.imread('img2.jpg')
img2 = cv2.resize(img2,(480,331))#统一图片大小

dst = cv2.addWeighted(img1,0.5,img2,0.5,0)

cv2.imshow('dst',dst)
cv2.waitKey(0)
cv2.destroyAllWindows()

import cv2
import numpy as np

img1 = cv2.imread('img.jpg')
img2 = cv2.imread('img1.jpg')

img2 = cv2.resize(img2,(100,100))
# 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, 200, 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)

# Take only region of logo from logo image.
img2_fg = cv2.bitwise_and(img2,img2,mask = mask_inv)

# 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.waitKey(0)
cv2.destroyAllWindows()