最近在开发的时候需要识别图片中的一些文字，网上找了相关资料之后，发现google有一个离线的工具，以下为java使用的demo
在此之前，使用这个工具需要在本地安装ocr工具：
下面一个是一定要安装的离线包，建议默认安装
上面一个是中文的语言包，如果网络可以fq的童鞋可以在安装的时候就选择语言包在线安装，有多种语言可供选择，默认只有英文的
exe安装好之后，把上面一个文件拷到安装目录下tessdata文件夹下
如c:\program files (x86)\tesseract-ocr\tessdata下
然后下面两个是可选包，如果图片不做临时文件处理的话，可以不需要带的
首先是一个临时文件生成用的类以防源文件损坏，参考某位博友的例子@gunner
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package org.ink.image.textrz;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 { private locale locale=locale.chinese; /** * user set locale construct * @param locale */ public imageiohelper(locale locale){ this.locale=locale; } /** * default construct using default locale locale.chinese */ public imageiohelper(){ } /** * create tempfile of image in order to prevent damaging original file * @param imagefile * @param imageformat like png,jps .etc * @return tempfile of image * @throws ioexception */ public file createimage(file imagefile, string imageformat) throws ioexception { iterator<imagereader> readers = imageio.getimagereadersbyformatname(imageformat); imagereader reader = readers.next(); imageinputstream iis = imageio.createimageinputstream(imagefile); reader.setinput(iis); iiometadata streammetadata = reader.getstreammetadata(); tiffimagewriteparam tiffwriteparam = new tiffimagewriteparam(locale.chinese); tiffwriteparam.setcompressionmode(imagewriteparam.mode_disabled); iterator<imagewriter> writers = imageio.getimagewritersbyformatname("tiff"); imagewriter writer = writers.next(); bufferedimage bi = reader.read(0); iioimage image = new iioimage(bi,null,reader.getimagemetadata(0)); file tempfile = tempimagefile(imagefile); imageoutputstream ios = imageio.createimageoutputstream(tempfile); writer.setoutput(ios); writer.write(streammetadata, image, tiffwriteparam); ios.close(); iis.close(); writer.dispose(); reader.dispose(); return tempfile; } /** * add suffix to tempfile * @param imagefile * @return * @throws ioexception */ private file tempimagefile(file imagefile) throws ioexception { string path = imagefile.getpath(); stringbuffer strb = new stringbuffer(path); strb.insert(path.lastindexof('.'),"_text_recognize_temp"); string s=strb.tostring().replacefirst("(?<=//.)(//w+)$", "tif"); runtime.getruntime().exec("attrib "+"\""+s+"\""+" +h"); //设置文件隐藏 return new file(strb.tostring()); } } |
下面是真正识别的内容：
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package org.ink.image.textrz;import java.io.bufferedreader; import java.io.file; import java.io.fileinputstream;import java.io.ioexception;import java.io.inputstreamreader; import java.util.arraylist; import java.util.list;import java.util.locale;import org.jdesktop.swingx.util.os; /** * text recognize utils * @author ink.flower * */public class ocrutil { 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";//ocr默认安装路径 private string transname="chi_sim";//默认中文语言包，识别中文 /** * construct method of ocr ,set tesseract-ocr install path * @param tesspath tesseract-ocr install path * @param transfilename traningfile name like eng.traineddata */ public ocrutil(string tesspath,string transfilename){ this.tesspath=tesspath; this.transname=transfilename; } /** * construct method of ocr,default path is "c://program files (x86)//tesseract-ocr" */ public ocrutil(){ } public string gettesspath() { return tesspath; } public void settesspath(string tesspath) { this.tesspath = tesspath; } public string gettransname() { return transname; } public void settransname(string transname) { this.transname = transname; } public string getlang_option() { return lang_option; } public string geteol() { return eol; } /** * recognize text in image * @param imagefile * @param imageformat * @return text recognized in image * @throws exception */ public string recognizetext(file imagefile,string imageformat)throws exception{ file tempimage = new imageiohelper().createimage(imagefile,imageformat); return ocrimages(tempimage, imagefile); } /** * recognize text in image * @param imagefile * @param imageformat * @param locale * @return text recognized in image * @throws exception */ public string recognizetext(file imagefile,string imageformat,locale locale)throws exception{ file tempimage = new imageiohelper(locale).createimage(imagefile,imageformat); return ocrimages(tempimage, imagefile); } /** * * @param tempimage * @param imagefile * @return * @throws ioexception * @throws interruptedexception */ private string ocrimages(file tempimage,file imagefile) throws ioexception, interruptedexception{ file outputfile = new file(imagefile.getparentfile(),"output"); runtime.getruntime().exec("attrib "+"\""+outputfile.getabsolutepath()+"\""+" +h"); //设置文件隐藏 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(transname); processbuilder pb = new processbuilder(); pb.directory(imagefile.getparentfile()); cmd.set(1, tempimage.getname()); pb.command(cmd); pb.redirecterrorstream(true); process process = pb.start(); int w = process.waitfor(); tempimage.delete();//删除临时正在工作文件 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(); }} |
在实验中发现，如果对有多个文字的大图进行直接识别的话，效果可能比较差，所以可以参考另一篇切图的博文，将图片取一块之后再识别
http://www.zzvips.com/article/123651.html ←我是链接
这样成功率会提高很多。
以上为离线识别版本，效率因图而已，具体使用的时候可以总结分析，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/inkflower/p/6642264.html
