如何在OpenCV-Python中使用MOG背景减除器修复前景？我试图获得一个更稳定的前景，一旦它能够正确地从背景中减除前景，就能持续显示前景（例如，固定前景大约5秒钟）。这是我的代码：

cap = cv2.VideoCapture(0)history = 500   # 或者你想要的任何值accelerate = 5fgbg = cv2.createBackgroundSubtractorMOG2(history=500,  varThreshold=20,  detectShadows=True)count=0while(1):    for i in (1, accelerate):        ret, frame = cap.read()    fgmask = fgbg.apply(frame, learningRate=1.0/history)    imageproc(fgmask,count)#    time.sleep(5)    k = cv2.waitKey(0) & 0xff    if k == 27:        break   cap.release()cv2.destroyAllWindows()

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