opencv 9 mouse event

click on video, will create region of interest around mouse location

zoomed in image of region of interest is displayed

#main.py

import numpy as np

import cv2

cap = cv2.VideoCapture("assets/Santa Barbara.mp4")

roi_w = 50

def click_event(event, x, y, flags, param):

    if event ==cv2.EVENT_LBUTTONDOWN:

        cv2.rectangle(param, (x-roi_w-2, y-roi_w-2), (x+roi_w+2, y+roi_w+2), (0, 0, 255), 2)

        cv2.imshow('original', param)

        roi = param[y-roi_w:y+roi_w, x-roi_w:x+roi_w]

        zoom_img = cv2.resize(roi, (0, 0), fx=5, fy=5)

        cv2.imshow('zoom in', zoom_img)

while True:

    ret, frame = cap.read()

    width = int(cap.get(3))

    height = int(cap.get(4))

    cv2.setMouseCallback('frame', click_event, frame)

    cv2.imshow('frame', frame)

    if cv2.waitKey(1) == ord('q'):

        break

    if cv2.waitKey(1) == ord('p'):

        # wait until any key is pressed

        cv2.waitKey(-1)

cap.release()

cv2.destroyAllWindows()

reference:

https://www.youtube.com/watch?v=a7_dBO3EAng&list=PLS1QulWo1RIa7D1O6skqDQ-JZ1GGHKK-K&index=11

setMouseCallback param

https://stackoverflow.com/questions/47114360/what-should-be-the-arguments-of-cv2-setmousecallback

pause video

https://stackoverflow.com/questions/38064777/use-waitkey-in-order-pause-and-play-video