Opencv: Function Arguments Useful For What?

I do not understand this code taken from OpenCV documentation: import cv2 import numpy as np # mouse callback function def draw_circle(event,x,y,flags,param): if event == cv2.

Solution 1:

Bellow my code is working fine just check it out..

import cv2
import numpy as np

img1=cv2.imread('Image/Desert.jpg')       
def draw(event,x,y,flage,param):
    if event==cv2.EVENT_LBUTTONDBLCLK:
        cv2.circle(img1,(x,y),4,(0,0,0),4)
        cv2.namedWindow('Image')
        cv2.setMouseCallback('Image',draw)
    while(1):
        cv2.imshow('Image',img1)
        if cv2.waitKey(20) & 0xFF ==27:
            break
    cv2.destroyAllWindows()