tesseract-ocr图片识别

今天看同事的ppt，提到了图片识别，又tesseract-ocr，觉得不错，试一下，如果效果好可以用来做验证码的识别 
http://code.google.com/p/tesseract-ocr/ 
tesseract是一款开源工具，我安装了Windows版试水先 

1、首先登录首页在‘下载’页面下载 

http://code.google.com/p/tesseract-ocr/downloads/list

 tesseract-ocr-setup-xx.xx.exe
 chi_sim.traineddata.gz   中文语言包

2、双击即可安装tesserract-ocr, 
3、安装中文语言包，将语言包 chi_sim.traineddata.gz   解压到 Tesseract-OCR下 

4、写测试代码：

package com.tesserract;
import java.io.BufferedReader;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.InputStreamReader;  
import java.util.ArrayList;  
import java.util.List;  
import org.jdesktop.swingx.util.OS;  
  
public class OCR {  
    private final String LANG_OPTION = "-l";  //英文字母小写l，并非数字1  
    private final String EOL = System.getProperty("line.separator");  
    private String tessPath = "C:\\Program Files (x86)\\Tesseract-OCR";  
    //private String tessPath = new File("tesseract").getAbsolutePath();  
  
    public String recognizeText(File imageFile,String imageFormat)throws Exception{  
        File tempImage = ImageIOHelper.createImage(imageFile,imageFormat);  
        File outputFile = new File(imageFile.getParentFile(),"output");  
        StringBuffer strB = new StringBuffer();  
        List cmd = new ArrayList();  
        if(OS.isWindowsXP()){  
            cmd.add(tessPath+"//tesseract");  
        }else if(OS.isLinux()){  
            cmd.add("tesseract");  
        }else{  
            cmd.add(tessPath+"//tesseract");  
        }  
        cmd.add("");  
        cmd.add(outputFile.getName());  
        cmd.add(LANG_OPTION);  
        //cmd.add("chi_sim");  
        cmd.add("eng");  
  
        ProcessBuilder pb = new ProcessBuilder();  
        pb.directory(imageFile.getParentFile());  
  
        cmd.set(1, tempImage.getName());  
        pb.command(cmd);  
        pb.redirectErrorStream(true);  
  
        Process process = pb.start();  
        //tesseract.exe 1.jpg 1 -l chi_sim  
        int w = process.waitFor();  
  
        //删除临时正在工作文件  
        tempImage.delete();  
  
        if(w==0){  
            BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(outputFile.getAbsolutePath()+".txt"),"UTF-8"));  
  
            String str;  
            while((str = in.readLine())!=null){  
                strB.append(str).append(EOL);  
            }  
            in.close();  
        }else{  
            String msg;  
            switch(w){  
                case 1:  
                    msg = "Errors accessing files.There may be spaces in your image's filename.";  
                    break;  
                case 29:  
                    msg = "Cannot recongnize the image or its selected region.";  
                    break;  
                case 31:  
                    msg = "Unsupported image format.";  
                    break;  
                default:  
                    msg = "Errors occurred.";  
            }  
            tempImage.delete();  
            throw new RuntimeException(msg);  
        }  
        new File(outputFile.getAbsolutePath()+".txt").delete();  
        return strB.toString();  
    }  
}  

package com.tesserract;

import java.awt.image.BufferedImage;  
import java.io.File;  
import java.io.IOException;  
import java.util.Iterator;  
import java.util.Locale;  
import javax.imageio.IIOImage;  
import javax.imageio.ImageIO;  
import javax.imageio.ImageReader;  
import javax.imageio.ImageWriteParam;  
import javax.imageio.ImageWriter;  
import javax.imageio.metadata.IIOMetadata;  
import javax.imageio.stream.ImageInputStream;  
import javax.imageio.stream.ImageOutputStream;  
  
import com.sun.media.imageio.plugins.tiff.TIFFImageWriteParam;  
  
public class ImageIOHelper {  
    /** 
     * 图片文件转换为tif格式 
     * @param imageFile 文件路径 
     * @param imageFormat 文件扩展名 
     * @return 
     */  
    public static File createImage(File imageFile, String imageFormat) {  
        File tempFile = null;  
        try {  
            Iterator readers = ImageIO.getImageReadersByFormatName(imageFormat);  
            ImageReader reader = readers.next();  
  
            ImageInputStream iis = ImageIO.createImageInputStream(imageFile);  
            reader.setInput(iis);  
            //Read the stream metadata  
            IIOMetadata streamMetadata = reader.getStreamMetadata();  
  
            //Set up the writeParam  
            TIFFImageWriteParam tiffWriteParam = new TIFFImageWriteParam(Locale.CHINESE);  
            tiffWriteParam.setCompressionMode(ImageWriteParam.MODE_DISABLED);  
  
            //Get tif writer and set output to file  
            Iterator writers = ImageIO.getImageWritersByFormatName("tiff");  
            ImageWriter writer = writers.next();  
  
            BufferedImage bi = reader.read(0);  
            IIOImage image = new IIOImage(bi,null,reader.getImageMetadata(0));  
            tempFile = tempImageFile(imageFile);  
            ImageOutputStream ios = ImageIO.createImageOutputStream(tempFile);  
            writer.setOutput(ios);  
            writer.write(streamMetadata, image, tiffWriteParam);  
            ios.close();  
  
            writer.dispose();  
            reader.dispose();  
  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return tempFile;  
    }  
  
    private static File tempImageFile(File imageFile) {  
        String path = imageFile.getPath();  
        StringBuffer strB = new StringBuffer(path);  
        strB.insert(path.lastIndexOf('.'),0);  
        return new File(strB.toString().replaceFirst("(?<=//.)(//w+)$", "tif"));  
    }  
  
}  

package com.tesserract;

import java.io.File;
import java.io.IOException;


public class TestOCR {


public static void main(String[] args) {  
        String path = "C:\\Program Files (x86)\\Tesseract-OCR\\ccc.png";  
        try {  
            String valCode = new OCR().recognizeText(new File(path), "png");  
            System.out.println(valCode);  
        } catch (IOException e) {  
            e.printStackTrace();  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  


}

备注：还可以通过命令行的方式识别图片

 1）打开cmd窗口，进入到tesseract目录下，然后就可以开始我们的测试之旅啦

 2）选择好你所要识别的图片，并确定你所要输出的文件，然后输入下列命令:

   tesseract  a.jpg 1

  "a.jpg": 需要识别的图片

   "1": 输出的文件 1.txt

原文出处：http://songpo-ath-taobao-com.iteye.com/blog/1664226