java图片文字识别技术

代码参考：http://blog.youkuaiyun.com/ycb1689/article/details/8520954

其实我觉得识别率不是很高，至少没有达到95%，而且图片稍微做点模糊处理就识别不了了，但是够我使用的了。

下载相关文件，http://pan.baidu.com/s/1jIi9rPc

主要有：

（1）tesseract-ocr-setup-3.01-1.exe（需要安装，安装很简单，一直下一步就可以了）

（2）jai_imageio-1.1-alpha.jar 和 swingx-1.6.1.jar（放到项目中）

（3）chi_sim.traineddata（中文语言包，里面也进行了压缩，解压后把chi_sim.traineddata放到testeract安装目录下的tessdata目录下），如下图：

接下来就是编码了，直接参考人家的了：

ImageIOHelper类

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 {    
        
    public static File createImage(File imageFile, String imageFormat) {    
        File tempFile = null;    
        try {    
            Iterator readers = ImageIO.getImageReadersByFormatName(imageFormat);    
            ImageReader reader = (ImageReader)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 = (ImageWriter)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"));    
    }    
    
}  

OCR类：

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 = "<span style="color: rgb(0, 0, 255); font-family: Consolas, "Courier New", Courier, mono, serif; background-color: rgb(248, 248, 248);">C://Program Files (x86)//Tesseract-OCR</span>"; //注：如果不是默认安装，需要修改这个路径   
    //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();    
    }    
}    

OcrTest。类

import java.io.File;  
import java.io.IOException;  
  
public class OcrTest {  
  
 public static void main(String[] args) {  
        String path = "E://test11.png";  //图片路径     
        System.out.println("ORC Test Begin......");  
        try {       
            String valCode = new OCR().recognizeText(new File(path), "png");       
            System.out.println(valCode);       
        } catch (IOException e) {       
            e.printStackTrace();       
        } catch (Exception e) {    
            e.printStackTrace();    
        }         
        System.out.println("ORC Test End......");  
    }    
  
}  

好了，自己试试吧