2019-03-22 by 崔斐然

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剩余工作：添加幀率顯示

import numpy as np import cv2 from collections import deque import argparseap = argparse.ArgumentParser() ap.add_argument("-v", "--video",help="path to the (optional) video file") ap.add_argument("-b", "--buffer", type=int, default=64,help="max buffer size") args = vars(ap.parse_args())cap = cv2.VideoCapture(0)greenLower = (29, 86, 6) greenUpper = (64, 255, 255) pts = deque(maxlen=args["buffer"])while (True):# Capture frame-by-frameret, frame = cap.read()# Display the resulting framehsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)green_mask = cv2.inRange(hsv, greenLower, greenUpper)green_mask = cv2.erode(green_mask, None, iterations=2)green_mask = cv2.dilate(green_mask, None, iterations=2)cnts = cv2.findContours(green_mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)[1]center = Noneif 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"]))if radius > 10:cv2.circle(frame, (int(x), int(y)), int(radius),(0, 255, 255), 2)cv2.circle(frame, center, 5, (0, 0, 255), -1)pts.appendleft(center)for i in range(1, len(pts)):if pts[i - 1] is None or pts[i] is None:continuethickness = int(np.sqrt(args["buffer"] / float(i + 1)) * 2.5)cv2.line(frame, pts[i - 1], pts[i], (0, 0, 255), thickness)cv2.imshow("Frame", frame)if cv2.waitKey(1) & 0xFF == ord('q'):break cap.release() cv2.destroyAllWindows()

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