7.Detect_clicks.py

import cv2
import numpy as np
 
circles = np.zeros((4,2),np.int)
counter = 0
 
def mousePoints(event,x,y,flags,params):
    global counter
    if event == cv2.EVENT_LBUTTONDOWN:
 
        circles[counter] = x,y
        counter = counter + 1
        print(circles)
 
img = cv2.imread('Img.jpg')
img = cv2.resize(img, (1000,800))
while True:
    if counter == 4:
        width, height = 300,300
        pts1 = np.float32([circles[0],circles[1],circles[2],circles[3]])
        pts2 = np.float32([[0,0],[width,0],[0,height],[width,height]])
        matrix = cv2.getPerspectiveTransform(pts1,pts2)
        imgOutput = cv2.warpPerspective(img,matrix,(width,height))
        cv2.imshow("Output Image ", imgOutput)
    for x in range (0,4):
        cv2.circle(img,(circles[x][0],circles[x][1]),3,(0,255,0),cv2.FILLED)
 
    cv2.imshow("Original Image ", img)
    cv2.setMouseCallback("Original Image ", mousePoints)
    cv2.waitKey(1)