Opencv实现抠图背景图替换功能

# coding=utf-8 import cv2import numpy as np img=cv2.imread('lp.jpg')img_back=cv2.imread('back.jpg')#日常缩放rows,cols,channels = img_back.shapeimg_back=cv2.resize(img_back,None,fx=0.7,fy=0.7)cv2.imshow('img_back',img_back) rows,cols,channels = img.shapeimg=cv2.resize(img,None,fx=0.4,fy=0.4)cv2.imshow('img',img)rows,cols,channels = img.shape#rows，cols最后一定要是前景图片的，后面遍历图片需要用到 #转换hsvhsv=cv2.cvtColor(img,cv2.COLOR_BGR2HSV)#获取masklower_blue=np.array([78,43,46])upper_blue=np.array([110,255,255])mask = cv2.inRange(hsv, lower_blue, upper_blue)cv2.imshow('Mask', mask) #腐蚀膨胀erode=cv2.erode(mask,None,iterations=1)cv2.imshow('erode',erode)dilate=cv2.dilate(erode,None,iterations=1)cv2.imshow('dilate',dilate) #遍历替换center=[50,50]#在新背景图片中的位置for i in range(rows): for j in range(cols): if dilate[i,j]==0:#0代表黑色的点  img_back[center[0]+i,center[1]+j]=img[i,j]#此处替换颜色，为BGR通道cv2.imshow('res',img_back) cv2.waitKey(0)cv2.destroyAllWindows()