opencv(九)--移动物体检测

import argparseimport cv2import imutilsimport time import datetimeap = argparse.ArgumentParser()ap.add_argument("-v","--video",help = "path to the video file")ap.add_argument("-a","--min-area", type = int,default = 600,help = "minimun area size")args = vars(ap.parse_args())if args.get("video", None) is None:   #1.get the video from cameracamera = cv2.VideoCapture(0)time.sleep(0.25)else:camera = cv2.VideoCapture(args["video"])   #2.read a video filefirstFrame = None    #initialize the first framewhile True:(grabbed, frame) = camera.read()text = "Unoccupied"if not grabbed:breakframe = imutils.resize(frame, width=500)  #the show screengray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)gray = cv2.GaussianBlur(gray, (21, 21), 0)if firstFrame is None:firstFrame = graycontinueframeDelta = cv2.absdiff(firstFrame, gray)     #the difference between firstframe and present framethresh = cv2.threshold(frameDelta, 30, 255, 0)[1]    thresh = cv2.dilate(thresh, None, iterations=4)  (_, contours, _) = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL,cv2.CHAIN_APPROX_SIMPLE)for c in contours:if cv2.contourArea(c) < args["min_area"]:continue(x, y, w, h) = cv2.boundingRect(c)cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)text = "Occupied"#in the present frame,write down the text and timecv2.putText(frame, "Room Status: {}".format(text), (10, 20),cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255), 2)cv2.putText(frame,datetime.datetime.now().strftime("%A %d %B %Y %I:%M:%S%p"),(10,frame.shape[0] - 10),cv2.FONT_HERSHEY_SIMPLEX,0.35,(0,0,255),2)cv2.imshow("Security Feed",frame)cv2.imshow("Thresh",thresh)cv2.imshow("Frame Delta",frameDelta)key = cv2.waitKey(1)if key == ord("q"):breakcamera.release()cv2.destroyAllWindows()

效果不是很好，要调一下参数