验证码识别

import serial
import ImageEnhance    
from PIL import Image
import ImageFilter    
import sys    
import os
from pytesser import *  

threshold = 140    
table = []    
for i in range(256):    
    if i < threshold:    
        table.append(0)    
    else:    
        table.append(1)    
    

rep={'O':'0',    
    'I':'1','L':'1',    
    'Z':'2',    
    'S':'8'    
    };    
    
def  getverify1(name):          

    im = Image.open(name)    

    imgry = im.convert('L')  

    imgry.save('g'+name)    

    out = imgry.point(table,'1')    
    out.save('b'+name)    

    text = image_to_string(out)    

    text = text.strip()    
    text = text.upper();      
    for r in rep:    
        text = text.replace(r,rep[r])     


    return text    
    
ser = serial.Serial('/dev/ttyUSB0',9600) 
nameList = os.listdir("./Pic")
for fileName in nameList:
    text = getverify1("./Pic"+fileName) 
    if len(test) == 4:
        picName = "./Pic/"+fileName
        picShow = Image.open(picName)
        picShow.show()                
        ser.write("text")
ser.close()