Python Motion Detector

from imutils.video import VideoStream
import numpy as np
import argparse
import datetime
import imutils
import time
import cv2
import os

# construct the argument parser and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-v", "--video", help="path to the video file")
ap.add_argument("-a", "--min-area", type=int, default=500, help="minimum area size")
args = vars(ap.parse_args())

# Initialize VideoStream
vs = VideoStream(usePiCamera=True, resolution=(640, 480), framerate=30).start()
time.sleep(2.0)
writer = None

# initialize the first frame in the video stream
firstFrame = None

# loop over the frames of the video
while True:
    isMotion = False
    # grab the current frame and initialize the occupied/unoccupied
    # text
    frame = vs.read()
    frame = frame if args.get("video", None) is None else frame[1]
    text = "Monitoring..."

    # if the frame could not be grabbed, then we have reached the end
    # of the video
    if frame is None:
        break

    # resize the frame, convert it to grayscale, and blur it
    frame = imutils.resize(frame, width=500)
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    gray = cv2.GaussianBlur(gray, (21, 21), 0)

    # if the first frame is None, initialize it
    if firstFrame is None:
        firstFrame = gray
        continue

    # compute the absolute difference between the current frame and
    # first frame
    frameDelta = cv2.absdiff(firstFrame, gray)
    thresh = cv2.threshold(frameDelta, 25, 255, cv2.THRESH_BINARY)[1]

    # dilate the thresholded image to fill in holes, then find contours
    # on thresholded image
    thresh = cv2.dilate(thresh, None, iterations=2)
    cnts = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
    cnts = cnts[0] if imutils.is_cv2() else cnts[1]

    # loop over the contours
    for c in cnts:
        # if the contour is too small, ignore it
        if cv2.contourArea(c) < args["min_area"]:
            continue

        # compute the bounding box for the contour, draw it on the frame,
        # and update the text
        (x, y, w, h) = cv2.boundingRect(c)
        cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)
        text = "Motion detected."
    isMotion = True


    # draw the text and timestamp on the frame
    cv2.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), 1)

    if isMotion:
        if writer is None:
        # initialize our video writer
        fileName = datetime.datetime.now().strftime("%Y-%d-%m_%I-%M-%S-%p.avi")
        print(fileName)
            fourcc = cv2.VideoWriter_fourcc(*"MPEG")
            writer = cv2.VideoWriter(fileName, fourcc, 30, (frame.shape[1], frame.shape[0]), True)

        # write the output frame to disk
        writer.write(frame)
    else:
        if not (writer is None):
        writer.release()
            writer = None
        print("Video Ended")


    # show the frame and record if the user presses a key
    cv2.imshow("Security Feed", frame)
    key = cv2.waitKey(1) & 0xFF

    # if the `q` key is pressed, break from the lop
    if key == ord("q"):
        break

# cleanup the camera and close any open windows
vs.stop() if args.get("video", None) is None else vs.release()
cv2.destroyAllWindows()