Java文字識別技術(shù)

1、Java 文字識別技術(shù)java文字識別程序的關(guān)鍵是尋找一個可以調(diào)用的 OCR引擎。tesseract-ocr就是一個這樣的 OCR 引擎，在 1985 年到 1995 年由 HP 實(shí)驗(yàn)室開發(fā)， 現(xiàn)在在 Google 。 tesseract-ocr 3.0 發(fā)布，支持中文。不過 tesseract-ocr 3.0 不是圖形化界面的客戶端，別人寫的 FreeOCR 圖形化客戶端還不支持導(dǎo)入 新的 3.0 traineddata 。但這標(biāo)志著，現(xiàn)在有自由的中文 OCR 軟件了。java 中使用 tesseract-ocr3.01 的步驟如下：1. 下載安裝 tesseract-ocr-setup-3

2、.01-1.exe ( 3.0 以上版本才增加了中文識別)2. 在安裝向?qū)е锌梢赃x擇需要下載的語言包。3. 到網(wǎng)上搜索下載 java 圖形處理所需的 2 個包： jai_imageio-1.1-alpha.jar ， swingx-1.6.1.jar4. java 程序清單：ImageIOHelper 類：import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Iterator;import java.util.Locale;import javax.

3、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.med

4、ia.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.cr

5、eateImageInputStream(imageFile); reader.setInput(iis);/Read the stream metadataIIOMetadata streamMetadata = reader.getStreamMetadata();/Set up the writeParamTIFFImageWriteParam tiffWriteParam = new TIFFImageWriteParam(Locale.CHINESE); tiffWriteParam.setCompressionMode(ImageWriteParam.MODE_DISABLED);

6、/Get tif writer and set output to fileIterator 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 = Image

7、IO.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

8、();StringBuffer strB = new StringBuffer(path); strB.insert(path.lastIndexOf(.),0);return new File(strB.toString().replaceFirst(?=/.)(/w+)$, tif);OCR 類：package com.hhp.util;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.InputStreamReader;import java.ut

9、il.ArrayList;import java.util.List;import org.jdesktop.swingx.util.OS;public class OCR private final Stri ng LANG_OPTION = -I; /英文字母小寫 |，并非數(shù)字 1private final String EOL = System.getProperty(line.separator);private String tessPath = C:/Program Files (x86)/Tesseract-OCR;/private String tessPath = new F

10、ile(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 ArrayLi

11、st();if(OS.isWindowsXP()cmd.add(tessPath+/tesseract);else if(OS.isLinux()cmd.add(tesseract);elsecmd.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.

12、set(1, tempImage.getName();mand(cmd);pb.redirectErrorStream(true);Process process = pb.start();/tesseract.exe 1.jpg 1 -l chi_simint w = process.waitFor();/刪除臨時正在工作文件tempImage.delete();if(w=0)BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(outputFile.getAbsolutePath()

13、+.txt),UTF-8);String str;while(str = in.readLine()!=null)strB.append(str).append(EOL);in.close();elseString msg;switch(w)case 1:msg = Errors accessing files.There may be spaces in your images filename.; break;case 29:msg = Cannot recongnize the image or its selected region.;break;case 31:msg = Unsup

14、ported image format.;break;default:msg = Errors occurred.;tempImage.delete();throw new RuntimeException(msg);new File(outputFile.getAbsolutePath()+.txt).delete();return strB.toString();測試類 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().recogn