CROP_BY_MOUSE.py

import cv2
import numpy as numpy

ref_point = []
crop = False

def shape_selection(event,x,y,flags,param):
	global ref_point, crop

	if event == cv2.EVENT_LBUTTONDOWN:
		ref_point = [(x,y)]

	elif event == cv2.EVENT_LBUTTONUP:
		ref_point.append((x,y))
		cv2.rectangle(image,ref_point[0],ref_point[1],(0,255,0),2)
		cv2.imshow("image",image)

image = cv2.imread("butterfly_GT.png")
clone = image.copy()
cv2.namedWindow("image")
cv2.setMouseCallback("image",shape_selection)

while True:
	cv2.imshow("image",image)
	Key = cv2.waitKey(20)

	if Key == ord("r"):
		image = clone.copy()

	if Key == ord("c"):
		break

if len(ref_point)==2:
	crop_img = clone[ref_point[0][1]:ref_point[1][1],ref_point[0][0]:ref_point[1][0]]
	cv2.imwrite('CROP.png',crop_img)
	imgb = cv2.imread('CROP.png',cv2.IMREAD_COLOR)
	cv2.imshow("Crop_img",crop_img)
	cv2.imshow("AACrop_img",imgb)
	cv2.waitKey()

cv2.destroyAllWindows()