import cv2
import numpy as np

img = cv2.imread('/home/sense/Downloads/droga.jpg', 1)

cv2.namedWindow('image', cv2.WINDOW_AUTOSIZE)

klik = 0
punkty = []
def save_p(event,x,y,flags,param):
    global klik, punkty

    if event == cv2.EVENT_LBUTTONUP:
        punkty.append([x,y])
        klik += 1

cv2.setMouseCallback('image', save_p)

while 1:
    cv2.imshow('image',img)

    while (klik > 3):
        pts1 = np.float32([punkty[0],punkty[1],punkty[2],punkty[3]])
        pts2 = np.float32([[0,0],[1459,0],[0,912],[1459,912]])

        M = cv2.getPerspectiveTransform(pts1,pts2)

        dst = cv2.warpPerspective(img,M,(1459,912))

        cv2.imshow('image2',dst)

        k = cv2.waitKey(1) & 0xFF
        if k == 27:
            break
        elif k == ord('w'):
            print punkty

    k = cv2.waitKey(1) & 0xFF
    if k == 27:
        break

cv2.destroyAllWindows()