小编Sam*_*say的帖子

我有一个实时视频源，可以跟踪绿色对象并在对象区域上绘制一个矩形。我很好奇我如何能够裁剪提要以仅显示矩形包含的区域。

以下是相关部分：

while True: 

    (success, frame) = webcam.read()

    frame = imutils.resize(frame, width = 1000)
    hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)

    mask = cv2.inRange(hsv, greenLower, greenUpper)
    mask = cv2.erode(mask, None, iterations=2)
    mask = cv2.dilate(mask, None, iterations=2)

    cnts = cv2.findContours(mask.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)[-2]
    center = None

    if len(cnts) > 0:

        c = max(cnts, key=cv2.contourArea)
        ((x, y), radius) = cv2.minEnclosingCircle(c)
        M = cv2.moments(c)
        center = (int(M["m10"] / M["m00"]), int(M["m01"] / M["m00"]))

    for c in cnts:
        if cv2.contourArea(c) < 500:
            continue

        (x, y, w, h) = cv2.boundingRect(c) …