opencv實現運動物體檢測跟蹤

 

利用opencv實現運動物體的跟蹤

def detect_video(video):
    camera = cv2.VideoCapture(video)
    history = 1

    bs = cv2.createBackgroundSubtractorKNN(detectShadows=True)
    bs.setHistory(history)

    frames = 0

    while True:
        res, frame = camera.read()

        if not res:
            break

        fg_mask = bs.apply(frame)  

        if frames < history:
            frames += 1
            continue

        th = cv2.threshold(fg_mask.copy(), 244, 255, cv2.THRESH_BINARY)[1]
        th = cv2.erode(th, cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (3, 3)), iterations=2)
        dilated = cv2.dilate(th, cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (8, 3)), iterations=2)

        image, contours, hier = cv2.findContours(dilated, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
        for c in contours:
            # 獲取矩形框邊界座標
            x, y, w, h = cv2.boundingRect(c)
            cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)

        cv2.imshow("track", frame)
        cv2.imshow("process", dilated)
        if cv2.waitKey(110) & 0xff == 27:
            break
    camera.release()