tesseract-ocr识别中文扫描图片实例讲解

当我浏览http://code.google.com/p/tesseract-ocr并下载了几个文件下来之后顿时感到一头雾水，不知该如何下手。网上看到有人在linux操作系统下的实现，

如：

利用开源程序（ImageMagick+tesseract-ocr）实现图像验证码识别

但却很少看到在windows下的相关文章介绍。

接下来我将一步步讲述如何采用tesseract-ocr识别含有中文的图片。

1、下载tesseract-ocr（注意3.0版本之后才支持中文的识别）

tesseract-ocr-setup-3.00.exe

chi_sim.traineddata.gz

2、安装tesseract-ocr

解压缩，双击 tesseract-ocr-setup-3.00.exe 即可根据提示一步步安装，本人安装的目录是：D:/Program
Files/Tesseract-OCR

在该目录下可看到tesseract.exe文件，这就是我们后面程序中会调用到的运行进程。

3、自定义安装语言包

D:/Program Files/Tesseract-OCR目录下找到/tessdata目录，其是用来存放语言包，可把chi_sim.traineddata.gz 解压缩之后的chi_sim.traineddata文件复制到该目录下即可。

4、编写测试代码

在编写代码之前下载两个jar包：jai_imageio-1.1-alpha.jar、swingx-1.0.jar，可在www.findjar.com 网站上去下载。

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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<ImageReader> 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<ImageWriter> 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"));

}

}

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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 = "D://Program Files//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<String> cmd = new ArrayList<String>();

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();

}

}

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import java.io.File;

import java.io.IOException;

public class TestOCR {

/**

* @param args

*/

public static void main(String[] args) {

String path = "d://test//chi.jpg";

try {

String valCode = new OCR().recognizeText(new File(path), "jpg");

System.out.println(valCode);

} catch (IOException e) {

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

}

}