python opencv实现证件照换底功能

#-*-coding:utf-8-*-
import cv2
import numpy as np

def cvtBackground(path,color):
  """
    功能：给证件照更换背景色（常用背景色红、白、蓝）
    输入参数：path:照片路径
        color:背景色 <格式[B,G,R]>
  """
  im=cv2.imread(path)
  im_hsv=cv2.cvtColor(im,cv2.COLOR_BGR2HSV)
  aim=np.uint8([[im[0,0,:]]])
  hsv_aim=cv2.cvtColor(aim,cv2.COLOR_BGR2HSV)
  mask=cv2.inRange(im_hsv,np.array([hsv_aim[0,0,0]-5,100,100]),np.array([hsv_aim[0,0,0]+5,255,255]))
  mask_inv=cv2.bitwise_not(mask) 
  img1=cv2.bitwise_and(im,im,mask=mask_inv)
  bg=im.copy()
  rows,cols,channels=im.shape
  bg[:rows,:cols,:]=color
  img2=cv2.bitwise_and(bg,bg,mask=mask)
  img=cv2.add(img1,img2)
  image={'im':im,'im_hsv':im_hsv,'mask':mask,'img':img}
  for key in image:
    cv2.namedWindow(key)
    cv2.imshow(key,image[key])
  cv2.waitKey(0)
  return img
#test
if __name__=='__main__':
  img=cvtBackground('./photo.jpg',[0,0,180])