OpenCV-Python图像叠加

import cv2
import numpy as np
#要叠加的图片大小
tw = 200
th = 200

#读取靶子图像
target = cv2.imread('target.png', cv2.IMREAD_COLOR)
target = cv2.resize(target, (th, tw))

cap = cv2.VideoCapture(0)
while(1):
 # get a frame
 ret, frame = cap.read()
 sp = frame.shape
 height = sp[0]
 widht = sp[1]

 #计算边距
 space_w = (widht - tw) // 2
 space_h = (height - th) // 2
 
 roi = frame[space_w:space_w+tw, space_h:space_h+th]
 test = cv2.addWeighted(roi, 0.8, target, 0.2, 0)
 frame[space_w:space_w+tw, space_h:space_h+th] = test
 
 # show a frame
 cv2.imshow("capture", frame)
   
 if cv2.waitKey(1) & 0xFF == ord('q'): 
  break
cap.release()
cv2.destroyAllWindows()