本篇文章给大家分享的是有关使用java怎么识别图片中的文字，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
java中使用tesseract-ocr3.01的步骤如下：
1.下载安装tesseract-ocr-setup-3.01-1.exe（3.0以上版本才增加了中文识别）
2.在安装向导中可以选择需要下载的语言包。
3.到网上搜索下载java图形处理所需的2个包：jai_imageio-1.1-alpha.jar，swingx-1.6.1.jar
4.java程序清单：
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 = 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"));
}
}OCR 类：
package com.hhp.util;
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();
}
}测试类TestOCR ：
import java.io.File;
import java.io.IOException;
import com.hhp.util.OCR;
public class OcrTest {
public static void main(String[] args) {
String path = "C://temp//OCRcode//4.png";
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......");
}
}Java有哪些集合类Java中的集合主要分为四类：1、List列表：有序的，可重复的；2、Queue队列：有序，可重复的；3、Set集合：不可重复；4、Map映射：无序，键唯一，值不唯一。
以上就是使用java怎么识别图片中的文字，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
