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Python3實現(xiàn)的簡單驗證碼識別功能示例

更新時間：2018年05月02日 09:27:45 作者：hldh214

這篇文章主要介紹了Python3實現(xiàn)的簡單驗證碼識別功能,涉及Python針對驗證碼圖片識別處理相關(guān)操作技巧,需要的朋友可以參考下

本文實例講述了Python3實現(xiàn)的簡單驗證碼識別功能。分享給大家供大家參考，具體如下：

這次的需求是自動登錄某機構(gòu)網(wǎng)站, 其驗證碼很具特色, 很適合做驗證碼識別入門demo, 先貼主要代碼, 其中圖片對比使用了編輯距離算法, 腳本使用了pillow庫

from PIL import Image
import requests
import re
splitter = re.compile(r'\d{30}') # 分割二值化后的圖片
# distance('11110000', '00000000')
# 比較兩個字符串有多少位不同, 返回不同的位數(shù)
def distance(string1, string2):
  d_str1 = len(string1)
  d_str2 = len(string2)
  d_arr = [[0] * d_str2 for i in range(d_str1)]
  for i in range(d_str1):
    for j in range(d_str2):
      if string1[i] == string2[j]:
        if i == 0 and j == 0:
          d_arr[i][j] = 0
        elif i != 0 and j == 0:
          d_arr[i][j] = d_arr[i - 1][j]
        elif i == 0 and j != 0:
          d_arr[i][j] = d_arr[i][j - 1]
        else:
          d_arr[i][j] = d_arr[i - 1][j - 1]
      else:
        if i == 0 and j == 0:
          d_arr[i][j] = 1
        elif i != 0 and j == 0:
          d_arr[i][j] = d_arr[i - 1][j] + 1
        elif i == 0 and j != 0:
          d_arr[i][j] = d_arr[i][j - 1] + 1
        else:
          d_arr[i][j] = min(d_arr[i][j - 1], d_arr[i - 1][j], d_arr[i - 1][j - 1]) + 1
  current = max(d_arr[d_str1 - 1][d_str2 - 1], abs(d_str2 - d_str1))
  # print("Levenshtein Distance is",current)
  # print(current)
  return current
# 去除字符串里面連續(xù)的1
def no_one(string):
  n_arr = splitter.findall(string)
  n_arr = filter(lambda each_str: each_str != '111111111111111111111111111111', n_arr)
  n_result = ''
  for n_each in n_arr:
    n_result += str(n_each)
  return n_result
opener = requests.session()
res = opener.get('http://60.211.254.236:8402/Ajax/ValidCodeImg.ashx').content
with open('verify.gif', 'wb') as v:
  v.write(res)
img = Image.open('verify.gif')
img = img.convert('L')
size = img.size
# img = img.point(table, '1')
img_arr = img.load()
# for x in range(size[0]):
#   for y in range(size[1]):
#     if img_arr[x, y] > 210:
#       img_arr[x, y] = 1
#     else:
#       img_arr[x, y] = 0
# img.save('after.gif')
inc = 0
str1 = ''
str2 = ''
str3 = ''
cur_str = ''
for x in range(size[0]):
  for y in range(size[1]):
    if img_arr[x, y] > 210:
      cur_str += '1'
    else:
      cur_str += '0'
    # print(img_arr[i, j], end='')
    # cur_str += str(img_arr[x, y])
  inc += 1
  # if inc % 18 == 0:
  #   print('\n----')
  # else:
  #   print('')
  if inc == 18:
    str1 = cur_str
    cur_str = ''
  elif inc == 36:
    str2 = cur_str
    cur_str = ''
  elif inc == 54:
    str3 = cur_str
    cur_str = ''
str1 = str1[:-60]
str2 = str2[:-60]
str3 = str3[:-60]
str1 = no_one(str1)
str2 = no_one(str2)
str3 = no_one(str3)
str1 = str1.strip('1')
str2 = str2.strip('1')
str3 = str3.strip('1')
# print(str1)
# print(str3)
with open('./dict/plus') as plus:
  with open('./dict/minus') as minus:
    p = plus.read()
    m = minus.read()
    is_add = 1 if distance(p, str2) < distance(m, str2) else 0
arr1 = []
arr3 = []
for each in range(1, 10):
  with open('./dict/{}'.format(each)) as f:
    ff = f.read()
    arr1.append([each, distance(ff, str1)])
    arr3.append([each, distance(ff, str3)])
arr1 = sorted(arr1, key=lambda item: item[1])
arr3 = sorted(arr3, key=lambda item: item[1])
result = arr1[0][0] + arr3[0][0] if is_add else arr1[0][0] - arr3[0][0]
print(result)
# login_url = 'http://60.211.254.236:8402/Ajax/Login.ashx?Method=G3_Login'
# login_data = {
#   'loginname': usn,
#   'password': pwd,
#   'validcode': result,
#
# }
# opener.get(login_url, login_data)

字庫已經(jīng)部署到GitHub地址：https://github.com/hldh214/validCode/

更多關(guān)于Python相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《Python圖片操作技巧總結(jié)》、《Python數(shù)據(jù)結(jié)構(gòu)與算法教程》、《Python Socket編程技巧總結(jié)》、《Python函數(shù)使用技巧總結(jié)》、《Python字符串操作技巧匯總》、《Python入門與進階經(jīng)典教程》及《Python文件與目錄操作技巧匯總》

希望本文所述對大家Python程序設(shè)計有所幫助。

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