Stupid CAPTCHA OCR written in 1 hour

@Stupid-CAPTCHA-OCR.md

一个超级简单的验证码识别。据说准确率比深度学习还要高哦（ε=ε=ε=┏(゜v゜;)┛

依赖：pip install Pillow

来源是 V2EX 上被喷惨的帖子： https://www.v2ex.com/t/354318

Author: laobubu

（纯粹个人兴趣掐着表写的，没收钱。一个小时内写完。PIL 的文档真难看。）

测试效果：

test.py

from PIL import Image, ImageChops

# uncomment these lines to generate `_chars2`
# _chars = [ Image.open("ch/%d.png"%i).convert('L') for i in range(10) ]
# _chars2 = [ c.tobytes('raw').replace('\x00','0').replace('\xff','1') for c in _chars ]

_chars2 = [
    '001110011011011011110011110011110011110011110110110110011100',
    '000011001111011110000110000110000110000110001100001100001100',
    '001110011011011011000011000011000110001100011000110000111111',
    '001110011011000011000011001110000010000011000011110110011110',
    '000011000111001110011110010110110110100110111111001100001100',
    '001111001100001100011000011110000011000011110011110010011100',
    '001110011011010000110110111011110011110011110011110110011100',
    '111111000011000110000110001100001100001100011000011000011000',
    '001110011011011011011011001100010110110110110110110110011100',
    '001110011011110011110011110011110111011011000110110110011100'
]

_chars = [Image.frombytes('L', (6,10), s.replace('0','\x00').replace('1','\xFF')) for s in _chars2]

def getch(im):
    rt = '1'
    diff = 99999
    for i in range(10):
        diff2 = sum(1 if ord(pix) > 0 else 0 for pix in ImageChops.difference(im, _chars[i]).tobytes('raw'))
        if diff2 < diff:
            rt = str(i)
            diff = diff2
    return rt



def handle(url):
    im = Image.open(url)
    w, h = im.size
    im = im.crop((1, 1, w-2, h-2))
    im = im.convert('HSV')

    channels = im.split()
    h=channels[0].point(lambda i: 255 if i > 170 and i < 199 else 0 )
    s=channels[1].point(lambda i: 255 if i > 253 else 0 )
    im = h and s

    c = [im.crop((x,4,x+6,14)) for x in (4+i*7 for i in range(4))]
    
    return ''.join([getch(ci) for ci in c])

for i in range(1, 6):
    fn = "%d.png"%i
    print(fn + " is " + handle(fn))

你好，大量的1和4之间互相认错。这个是_chars2造成的吗？

http://wx.mindaxiaosi.com/admin/fileadmin/download/CAPTCHA.zip
给您更多的下载验证码下载地址

186 / 500 当前成功率

@Jolly23 186/500很正常吧。由于样本里没有 1 所以我随手画了一个。 1和4相互识别错误，导致每一位的正确率降为 0.8 然后 0.8**4 ≈ 0.4 ≈ 186/500 。

你自己可以改改代码重新生成 chars2，这事儿别做伸手党了。

还有就是在 gist 上留言，邮箱是收不到提醒的。