（转）python+opencv实现动态物体追踪

原文链接：https://blog.csdn.net/cike14/article/details/50649811

import cv2
import numpy as np
camera=cv2.VideoCapture(0)
firstframe=None
while True:
    ret,frame = camera.read()
    if not ret:
        break
    gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
    gray=cv2.GaussianBlur(gray,(21,21),0)
    if firstframe is None:
        firstframe=gray
        continue  

    frameDelta = cv2.absdiff(firstframe,gray)
    thresh = cv2.threshold(frameDelta, 25, 255, cv2.THRESH_BINARY)[1]
    thresh = cv2.dilate(thresh, None, iterations=2)
    # cnts= cv2.findContours(thresh.copy(),cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)  

    x,y,w,h=cv2.boundingRect(thresh)
    frame=cv2.rectangle(frame,(x,y),(x+w,y+h),(0,0,255),2)
    cv2.imshow("frame", frame)
    cv2.imshow("Thresh", thresh)
    cv2.imshow("frame2", frameDelta)
    key = cv2.waitKey(1)&0xFF  

    if key == ord("q"):
        break  

camera.release()
cv2.destroyAllWindows()  

效果图