"""

识别答题卡

"""

import cv2

import numpy as np

def showImg(img_name, img):

cv2.imshow(img_name, img)

cv2.waitKey()

cv2.destroyAllWindows()

def get_max_rect(sorted_cnts):

for cnt in sorted_cnts:

# 轮廓近似

possible_cnts = []

epsilon = 0.1 * cv2.arcLength(cnt, True)

approx = cv2.approxPolyDP(cnt, epsilon, True)

if len(approx) == 4:

possible_cnts.append(cnt)

possible_cnts = sorted(possible_cnts, key=lambda x: cv2.arcLength(x, True))

return possible_cnts

def get_max_bounding_rect(possible_cnts):

# for cnt in possible_cnts:

# x, y, w, h = cv2.boundingRect(cnt)

sorted_cnts = sorted(possible_cnts, key=lambda cnt: cv2.boundingRect(cnt)[2]*cv2.boundingRect(cnt)[3], reverse=True)

print(sorted_cnts[