0.31.0# coding=utf-8
import cv2
import numpy as np
bottom = cv2.imread('elegent.jpg')
mark = cv2.imread('mask.jpg')
加水印
def waterMark(src, mask, transparency):
对掩码：转为float型 --> 乘上透明度 --> 地板整数 --> 回到uint8型
mask = np.floor(mask.astype(np.float32) * transparency).astype(np.uint8)
dst = cv2.add(src, mask)
# 防止溢出像素值域
dst = dst * (dst <= 255) + 255 * (dst > 255)
# 回到uint8型
dst = dst.astype(np.uint8)
return dst
# coding=utf-8
import cv2img1 = cv2.imread('elegent.jpg')
img2 = cv2.imread('mask.jpg')
b_rows, b_cols, b_channels = img1.shape
m_rows, m_cols, m_channels = img2.shape
I want to put logo on top-left corner, So I create a ROI
rows,cols,channels = img2.shape
roi = img1[b_rows-m_rows:b_rows, b_cols-m_cols:b_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
将图片右下角矩形块 替换为 加过水印的矩形块
img1[b_rows-m_rows:b_rows, b_cols-m_cols:b_cols, ] = dst
cv2.imwrite('res.jpg', img1)
cv2.imshow('res',img1)
cv2.waitKey(0)
cv2.destroyAllWindows()