从帐单上移除邮票 python

Question

关于如何在 OCR 处理之前从该帐单上移除邮票有什么想法吗？

Answer 1

这是 Python/OpenCV 中的一种方法。

读取输入
黄色阈值
扩大以填满矩形
获取最大轮廓
在输入图像上绘制白色填充轮廓
保存结果

输入：

import cv2
import numpy as np

# read image
img = cv2.imread('form_with_label.jpg')

# threshold on yellow
lower=(0,200,200)
upper=(100,255,255)
thresh = cv2.inRange(img, lower, upper)

# apply dilate morphology
kernel = np.ones((9,9), np.uint8)
mask = cv2.morphologyEx(thresh, cv2.MORPH_DILATE, kernel)

# get largest contour
contours = cv2.findContours(mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
contours = contours[0] if len(contours) == 2 else contours[1]
big_contour = max(contours, key=cv2.contourArea)
x,y,w,h = cv2.boundingRect(big_contour)

# draw filled white contour on input 
result = img.copy()
cv2.drawContours(result,[big_contour],0,(255,255,255),-1)

# save cropped image
cv2.imwrite('form_with_label_thresh.png',thresh)
cv2.imwrite('form_with_label_mask.png',mask)
cv2.imwrite('form_with_label_removed.png',result)

# show the images
cv2.imshow("THRESH", thresh)
cv2.imshow("MASK", mask)
cv2.imshow("RESULT", result)
cv2.waitKey(0)
cv2.destroyAllWindows()

阈值图像：

形态膨胀图像：

结果：

从帐单上移除邮票 python

Remove stamp from bill python

python

opencv

ocr

python-tesseract