22_basic_motion_detection.py

import cv2 as cv
import numpy as np

cap = cv.VideoCapture('images/vtest.avi')

ret, frame1 = cap.read()
ret, frame2 = cap.read()

while cap.isOpened():
    diff = cv.absdiff(frame1, frame2)
    gray = cv.cvtColor(diff, cv.COLOR_BGR2GRAY)
    blur = cv.blur(gray, (5, 5), 0)
    _, thresh = cv.threshold(blur, 20, 255, 0)
    dilated = cv.dilate(thresh, None, iterations=3)
    contours, _ = cv.findContours(dilated, cv.RETR_TREE, cv.CHAIN_APPROX_SIMPLE)

    for contour in contours:
        (x, y, w, h) = cv.boundingRect(contour)
        if cv.contourArea(contour) < 1000:
            continue
        cv.rectangle(frame1, (x, y), (x + w, y + h), (0, 255, 0), 2)
        cv.putText(
            frame1, 'Status: {}'.format('Movement'),
            (10, 20), cv.FONT_HERSHEY_SIMPLEX,
            1, (0, 0, 255), 1
        )
    # cv.drawContours(frame1, contours, -1, (0, 255, 255), 2)

    cv.imshow('Inter', frame1)
    frame1 = frame2
    ret, frame2 = cap.read()

    if cv.waitKey(40) == 27:
        break

cv.destroyAllWindows()
cap.release()