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本文是OpenCV图像视觉入门之路的第9篇文章,本文详细的在图像上面进行了图像叠加图像混合等操作。
OpenCV 图像叠加、混合目录
图片叠加一般加入水印用的特别多,比如视频网站、图片素材网等等
- import cv2
- from PIL import Image, ImageFont, ImageDraw
- import matplotlib.pyplot as plt
- import numpy as np
- from numpy import unicode
-
- if __name__ == '__main__':
-
- img1 = cv2.imread("D:/Jupyter_Notebooks/0.jpg") # 读取彩色图像(BGR)
- img2 = cv2.imread("D:/Jupyter_Notebooks/1.3.png") # 读取 CV Logo
-
- # 我想把logo放在左上角,所以我创建了ROI
- rows, cols, channels = img2.shape
- roi = img1[0:rows, 0:cols]
- # 现在创建logo的掩码,并同时创建其相反掩码
- img2gray = cv2.cvtColor(img2, cv2.COLOR_BGR2GRAY)
- ret, mask = cv2.threshold(img2gray, 10, 255, cv2.THRESH_BINARY)
- mask_inv = cv2.bitwise_not(mask)
- # 现在将ROI中logo的区域涂黑
- img1_bg = cv2.bitwise_and(roi, roi, mask=mask_inv)
- # 仅从logo图像中提取logo区域
- img2_fg = cv2.bitwise_and(img2, img2, mask=mask)
- # 将logo放入ROI并修改主图像
- dst = cv2.add(img1_bg, img2_fg)
- img1[0:rows, 0:cols] = dst
-
- cv2.imshow("imgAdd", img1) # 显示叠加图像 imgAdd
-
- cv2.waitKey(0)
- cv2.destroyAllWindows()

图像的混合:将两幅图像按照不同的比例进行混合 cv2.addWeighted()
- import cv2
- from PIL import Image, ImageFont, ImageDraw
- import matplotlib.pyplot as plt
- import numpy as np
- from numpy import unicode
-
- if __name__ == '__main__':
- img1 = cv2.imread("D:/Jupyter_Notebooks/1.2.png") # 读取彩色图像(BGR)
- img2 = cv2.imread("D:/Jupyter_Notebooks/1.3.png") # 读取 CV Logo
-
- # 混合后的图片
- dst = cv2.addWeighted(img1, 0.7, img2, 0.3, 0) # 图片img1所占比重0.7;图片img2所占比重0.3
-
- cv2.imshow("imgAdd", dst) # 显示叠加图像 dst
-
- cv2.waitKey(0)
- cv2.destroyAllWindows()

需要注意:两张图片尺寸需要一致否则会出异常
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