java从图片中识别文字


package com.dream.common;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.FileImageInputStream;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;import com.github.jaiimageio.plugins.tiff.TIFFImageWriteParam;/**
* 识别图片中的文字
*
* @author zlj
*
*/
public class ImageIOHelper {
/**
* 创建临时图片文件
*
* @param imageFile
* @return
* @throws IOException
*/
public File createImage(File imageFile) throws IOException {
Iterator<ImageReader> readers = ImageIO.getImageReaders(new FileImageInputStream(imageFile));
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;
}/**
* 添加后缀 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());
}
}package com.dream.common;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 org.jdesktop.swingx.util.OS;/**
* 从图片中识别文字
* @author zlj
*
*/
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/**
* 从图片中识别文字
* @param imageFile
* @param imageFormat
* @return text recognized in image
* @throws Exception
*/
public String recognizeText(File imageFile) throws Exception {
File tempImage = new ImageIOHelper().createImage(imageFile);
return ocrImages(tempImage, imageFile);
}
/**
* 识别图片中的文字
* @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();
}public static void main(String[] args) throws Exception {
System.out.println("begin");
String path = "F://test1.png";
String valCode = new OCRUtil().recognizeText(new File(path));
System.out.println(valCode);
System.out.println("end");
}
}