# 提取印章 > 代碼倉庫: https://github.com/edk24/getseal #### 版本 - python 2.7 #### 庫 ```bash $ pip install opencv-python $ pip install numpy $ sudo pip install Pillow ``` #### 提取印章 (白色背景) > 需要安裝 opencv和numpy, > 來源: https://blog.csdn.net/wsp_1138886114/article/details/82858380 ```python import cv2 import numpy as np np.set_printoptions(threshold=np.inf) image=cv2.imread("fapiao.png") hue_image = cv2.cvtColor(image, cv2.COLOR_BGR2HSV) low_range = np.array([150, 103, 100]) high_range = np.array([180, 255, 255]) th = cv2.inRange(hue_image, low_range, high_range) index1 = th == 255 img = np.zeros(image.shape, np.uint8) img[:, :] = (255,255,255) img[index1] = image[index1]#(0,0,255) cv2.imshow('original_img', image) cv2.imshow('extract_img', img) cv2.imwrite('woc.png', img, [int(cv2.IMWRITE_PNG_COMPRESSION),9]) ``` 結果背景是白色的 #### 完整提取印章 (透明白色背景) ```python #/usr/bin/env python # -*- coding: UTF-8 -*- import cv2 import numpy as np import PIL.Image as Image import sys, getopt import time def transparent_back(img): img = img.convert('RGBA') L, H = img.size color_0 = (255,255,255,255) for h in range(H): for l in range(L): dot = (l,h) color_1 = img.getpixel(dot) if color_1 == color_0: color_1 = color_1[:-1] + (0,) img.putpixel(dot,color_1) return img def action(inputfile, outputfile): np.set_printoptions(threshold=np.inf) image=cv2.imread(inputfile) hue_image = cv2.cvtColor(image, cv2.COLOR_BGR2HSV) low_range = np.array([150, 103, 100]) high_range = np.array([180, 255, 255]) th = cv2.inRange(hue_image, low_range, high_range) index1 = th == 255 # save image img = np.zeros(image.shape, np.uint8) img[:, :] = (255,255,255) img[index1] = image[index1]#(0,0,255) cv2.imwrite(outputfile, img, [int(cv2.IMWRITE_PNG_COMPRESSION), 9]) # delete rgb(255,255,255) img1 = Image.open(outputfile) img1=transparent_back(img1) img1.save(outputfile) if __name__ == "__main__": inputfile = '' outputfile = '' argv = sys.argv[1:] try: opts, args = getopt.getopt(argv,"hi:o:",["ifile=","ofile="]) except getopt.GetoptError: print ' -i <inputfile> -o <outputfile>' sys.exit(2) for opt, arg in opts: if opt == '-h': print ' -i <inputfile> -o <outputfile>' sys.exit() elif opt in ("-i", "--ifile"): inputfile = arg elif opt in ("-o", "--ofile"): outputfile = arg start = time.time() action(inputfile, outputfile) end = time.time() print("耗時: "+str(end-start)) ``` 使用方式: `test.py -i 源文件 -o 結果目標文件`