Python OCR提取普通数字图形验证中的数字

截取图形验证码：

 1 # -*- coding: UTF-8 -*-
 2 ‘‘‘
 3 Created on 2016年7月4日
 4
 5 @author: xuxianglin
 6 ‘‘‘
 7 import os
 8 import tempfile
 9 import shutil
10
11 from PIL import Image
12
13 PATH = lambda p: os.path.abspath(p)
14 TEMP_FILE = PATH(tempfile.gettempdir() + "/temp_screen.png")
15
16 class Appium_Extend(object):
17     def __init__(self, driver):
18         self.driver = driver
19
20     def get_screenshot_by_element(self, element):
21         #先截取整个屏幕，存储至系统临时目录下
22         self.driver.get_screenshot_as_file(TEMP_FILE)
23
24         #获取元素bounds
25         location = element.location
26         size = element.size
27         box = (location["x"], location["y"], location["x"] + size["width"], location["y"] + size["height"])
28
29         #截取图片
30         image = Image.open(TEMP_FILE)
31         newImage = image.crop(box)
32         newImage.save(TEMP_FILE)
33
34         return self
35
36     def get_screenshot_by_custom_size(self, start_x, start_y, end_x, end_y):
37         #自定义截取范围
38         self.driver.get_screenshot_as_file(TEMP_FILE)
39         box = (start_x, start_y, end_x, end_y)
40
41         image = Image.open(TEMP_FILE)
42         newImage = image.crop(box)
43         newImage.save(TEMP_FILE)
44
45         return self
46
47     def write_to_file( self, dirPath, imageName, form = "png"):
48         #将截屏文件复制到指定目录下
49         if not os.path.isdir(dirPath):
50             os.makedirs(dirPath)
51         shutil.copyfile(TEMP_FILE, PATH(dirPath + "/" + imageName + "." + form))
52
53     def load_image(self, image_path):
54         #加载目标图片供对比用
55         if os.path.isfile(image_path):
56             load = Image.open(image_path)
57             return load
58         else:
59             raise Exception("%s is not exist" %image_path)
60
61     def same_as(self, load_image, percent):
62         #对比图片，percent值设为0，则100%相似时返回True，设置的值越大，相差越大
63         import math
64         import operator
65
66         image1 = Image.open(TEMP_FILE)
67         image2 = load_image
68
69         histogram1 = image1.histogram()
70         histogram2 = image2.histogram()
71
72         differ = math.sqrt(reduce(operator.add, list(map(lambda a,b: (a-b)**2, 73                                                          histogram1, histogram2)))/len(histogram1))
74         if differ <= percent:
75             return True
76         else:
77             return False

在定位元素中调用改方法：

1   vcode=self.driver.find_element_by_id("com.ajb.sp:id/changepsw_code_img")
2   self.extend.get_screenshot_by_element(vcode).write_to_file("..\\resource\\vcode\\","image")
3   self.assertTrue(os.path.isfile(‘..\\resource\\vcode\\image.png‘))
4   image=Image.open(‘..\\resource\\vcode\\image.png‘)
5   vcode_number=pytesseract.image_to_string(image)
6   print u"截取到的验证码为：%s"%vcode_number