1
import cv2
2

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#上一帧
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lastFram = None
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#我这的视频源是使用网络摄像头
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cap = cv2.VideoCapture("rtsp://admin:admin@192.168.31.89:8445/live")
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while (cap.isOpened()):
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    #逐帧读取摄像头画面
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    ret, fram = cap.read()
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    #转为灰度图
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    fram = cv2.cvtColor(fram, cv2.COLOR_BGR2GRAY)
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    #转为二值图
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    fram = cv2.threshold(fram, 25, 255, cv2.THRESH_BINARY)[1]
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    #初始帧
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    if lastFram is None:
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        lastFram = fram
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        continue
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    #将上一帧与当前帧做差运算
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    frameDelta = cv2.absdiff(lastFram, fram)
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    #当前帧设为上一帧
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    lastFram = fram.copy()
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    #显示
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    cv2.imshow("f", fram)
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    if cv2.waitKey(1) & 0xFF == ord('q'):
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        break
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cap.release()
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cv2.destroyAllWindows()

1
import cv2
2

3
#A帧
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aFram = None
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#B帧
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bFram = None
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#我这的视频源是使用网络摄像头
8
cap = cv2.VideoCapture("rtsp://admin:admin@192.168.31.89:8445/live")
9
while (cap.isOpened()):
10
    #逐帧读取摄像头画面
11
    ret, fram = cap.read()
12
    #转为灰度图
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    fram = cv2.cvtColor(fram, cv2.COLOR_BGR2GRAY)
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    #转为二值图
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    fram = cv2.threshold(fram, 25, 255, cv2.THRESH_BINARY)[1]
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    #初始帧
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    if bFram is None:
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        if aFram is None:
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            aFram = fram.copy()
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        else:
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            bFram = fram.copy()
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            global abFram
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            abFram = cv2.absdiff(aFram, bFram)
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        continue
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    bcFram = cv2.absdiff(bFram, fram)
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    #与运算
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    thresh = cv2.bitwise_and(adFram,bcFram)
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    abFram = bcFram.copy()
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    aFram = bFram.copy()
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    bFram = fram.copy()
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    #显示
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    cv2.imshow("f", thresh)
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    if cv2.waitKey(1) & 0xFF == ord('q'):
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        break
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cap.release()
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cv2.destroyAllWindows()