【OpenCV】8 图像运算

相加 add

import cv2
import numpy as np

dragon = cv2.imread('img/dragon.png')
magcian = cv2.imread('img/magcian.png')

result = cv2.add(dragon, magcian)

cv2.imshow('result', result)

cv2.waitKey(0)

相减 subtract

import cv2
import numpy as np

cat = cv2.imread('img/cat.jpg')
dog = cv2.imread('img/dog.jpg')

result1 = cv2.subtract(cat, dog)
result2= cv2.subtract(dog, cat)

cv2.imshow('result1', result1)
cv2.imshow('result2', result2)

cv2.waitKey(0)

乘 multiply

除 divide

溶合 addWeighted

import cv2
import numpy as np

cat = cv2.imread('img/cat.jpg')
dog = cv2.imread('img/dog.jpg')

result = cv2.addWeighted(cat, 0.5, dog, 0.5, 0)

cv2.imshow('result', result)

cv2.waitKey(0)

非运算 bitwise_not

import cv2
import numpy as np

cat = cv2.imread('img/cat.jpg')
# dog = cv2.imread('img/dog.jpg')

result = cv2.bitwise_not(cat)

cv2.imshow('result', result)

cv2.waitKey(0)

与运算 bitwise_and

import cv2
import numpy as np

cat = cv2.imread('img/cat.jpg')
dog = cv2.imread('img/dog.jpg')

result = cv2.bitwise_and(cat, dog)

cv2.imshow('result', result)

cv2.waitKey(0)

或运算 bitwise_or

import cv2
import numpy as np

cat = cv2.imread('img/cat.jpg')
dog = cv2.imread('img/dog.jpg')

result = cv2.bitwise_or(cat, dog)

cv2.imshow('result', result)

cv2.waitKey(0)

异或运算 xor

import cv2
import numpy as np

cat = cv2.imread('img/cat.jpg')
dog = cv2.imread('img/dog.jpg')

result = cv2.bitwise_xor(cat, dog)

cv2.imshow('result', result)

cv2.waitKey(0)

实战 添加水印

import cv2
import numpy as np

# 1. 导入图片
cat = cv2.imread('img/cat.jpg')

# 创建logo 和 mask
logo = np.zeros((150, 150, 3), np.uint8)
mask = np.zeros((150, 150), np.uint8)

# 绘制logo
logo[20:70, 20:70] = [0, 0, 255]
logo[80:130, 80:130] = [0, 255, 0]

mask[20:70, 20:70] = 255
mask[80:130, 80:130] = 255

# mask按位求反
m = cv2.bitwise_not(mask)

# 选择添加logo的位置
roi = cat[0:150, 0:150]

# 与操作
tmp = cv2.bitwise_and(roi, roi, mask=m)

dst = cv2.add(tmp, logo)

cat[0:150, 0:150] = dst

cv2.imshow('logo', cat)
cv2.waitKey(0)