Java文字图像识别(1)[88250原创]
摘要
图像识别是目前很热门的研究领域，涉及的知识很广，包括信息论、模式识别、模糊数学、图像编码、内容分类等等。本文仅对使用Java实现了一个简单的图像文本二值处理，关于识别并未实现。步骤
-
建立文本字符模板二值矩阵
-
对测试字符进行二值矩阵化处理
代码
/*
* @(#)StdModelRepository.java
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package cn.edu.ynu.sei.recognition.util;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
/**
* Hold character charImgs as standard model repository.
* @author 88250
* @version 1.0.0.0, Mar 20, 2008
*/
public class StdModelRepository {
/**
* hold character images
*/
List < BufferedImage > charImgs = new ArrayList < BufferedImage > ();
/**
* default width of a character
*/
static int width = 16 ;
/**
* default height of a character
*/
static int height = 28 ;
/**
* standard character model matrix
*/
public int [][][] stdCharMatrix = new int [ 27 ][width][height];
/**
* Default constructor.
*/
public StdModelRepository() {
BufferedImage lowercase = null ;
try {
lowercase = ImageIO.read( new File( " lowercase.png " ));
} catch (IOException ex) {
Logger.getLogger(StdModelRepository. class .getName()).
log(Level.SEVERE, null , ex);
}
for ( int i = 0 ; i < 26 ; i ++ ) {
charImgs.add(lowercase.getSubimage(i * width,
0 ,
width,
height));
}
for ( int i = 0 ; i < charImgs.size(); i ++ ) {
Image image = charImgs.get(i);
int [] pixels = ImageUtils.getPixels(image,
image.getWidth( null ),
image.getHeight( null ));
stdCharMatrix[i] = ImageUtils.getSymbolMatrix(pixels, 0 ).clone();
ImageUtils.displayMatrix(stdCharMatrix[i]);
}
}
}
* @(#)StdModelRepository.java
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package cn.edu.ynu.sei.recognition.util;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
/**
* Hold character charImgs as standard model repository.
* @author 88250
* @version 1.0.0.0, Mar 20, 2008
*/
public class StdModelRepository {
/**
* hold character images
*/
List < BufferedImage > charImgs = new ArrayList < BufferedImage > ();
/**
* default width of a character
*/
static int width = 16 ;
/**
* default height of a character
*/
static int height = 28 ;
/**
* standard character model matrix
*/
public int [][][] stdCharMatrix = new int [ 27 ][width][height];
/**
* Default constructor.
*/
public StdModelRepository() {
BufferedImage lowercase = null ;
try {
lowercase = ImageIO.read( new File( " lowercase.png " ));
} catch (IOException ex) {
Logger.getLogger(StdModelRepository. class .getName()).
log(Level.SEVERE, null , ex);
}
for ( int i = 0 ; i < 26 ; i ++ ) {
charImgs.add(lowercase.getSubimage(i * width,
0 ,
width,
height));
}
for ( int i = 0 ; i < charImgs.size(); i ++ ) {
Image image = charImgs.get(i);
int [] pixels = ImageUtils.getPixels(image,
image.getWidth( null ),
image.getHeight( null ));
stdCharMatrix[i] = ImageUtils.getSymbolMatrix(pixels, 0 ).clone();
ImageUtils.displayMatrix(stdCharMatrix[i]);
}
}
}
/*
* @(#)ImageUtils.java
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package cn.edu.ynu.sei.recognition.util;
import java.awt.Image;
import java.awt.image.PixelGrabber;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Mainipulation of image data.
* @author 88250
* @version 1.0.0.3, Mar 20, 2008
*/
public class ImageUtils {
/**
* Return all of the pixel values of sepecified <code>image</code>.
* @param image the sepecified image
* @param width width of the <code>image</code>
* @param height height of the <code>image</code>
* @return
*/
public static int [] getPixels(Image image, int width, int height) {
int [] pixels = new int [width * height];
try {
new PixelGrabber(image, 0 , 0 , width, height, pixels, 0 , width).grabPixels();
} catch (InterruptedException ex) {
Logger.getLogger(ImageUtils. class .getName()).
log(Level.SEVERE, null , ex);
}
return pixels;
}
/**
* Get a matrix that described the <code>pixels</code>.
* <p>
* For example, the result of the matrix like this:
* <center>
* 0000000000000000<br>
* 0000000000000000<br>
* 0001111111110000<br>
* 0011111111111000<br>
* 0011111111111100<br>
* 0011000000011100<br>
* 0000000000011100<br>
* 0000111111111100<br>
* 0011111111111100<br>
* 0011111110011100<br>
* 0111100000011100<br>
* 0111100000011100<br>
* 0111100000111100<br>
* 0111100001111110<br>
* 0011111111111100<br>
* 0011111111111100<br>
* 0001111111111100<br>
* 0000000000000000<br>
* 0000000000000000<br>
* </center>
* it describes the alphbet 'a'.
* </p>
* @param pixels the pixel array
* @param sparseFactor sparse factor
* @return a matrix that describes a alphbet
*/
public static int [][] getSymbolMatrix( int [] pixels, int sparseFactor) {
final int width = StdModelRepository.width;
final int height = StdModelRepository.height;
int [][] ret = new int [width][height];
for ( int i = 0 ; i < height; i ++ ) {
for ( int j = 0 ; j < width; j ++ ) {
if (pixels[i * width + j] == - 1 ) {
ret[j][i] = 0 ;
} else {
ret[j][i] = 1 ;
}
}
}
return ret;
}
/**
* Print the <code>matrix</code> under console.
* @param matrix the sepecified matrix data
*/
public static void displayMatrix( int [][] matrix) {
System.out.println( " " );
for ( int i = 0 ; i < matrix[ 0 ].length; i ++ ) {
for ( int j = 0 ; j < matrix.length; j ++ ) {
if (matrix[j][i] != 0 ) {
System.out.print( " * " );
} else {
System.out.print( " " );
}
}
System.out.println();
}
}
}
* @(#)ImageUtils.java
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package cn.edu.ynu.sei.recognition.util;
import java.awt.Image;
import java.awt.image.PixelGrabber;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Mainipulation of image data.
* @author 88250
* @version 1.0.0.3, Mar 20, 2008
*/
public class ImageUtils {
/**
* Return all of the pixel values of sepecified <code>image</code>.
* @param image the sepecified image
* @param width width of the <code>image</code>
* @param height height of the <code>image</code>
* @return
*/
public static int [] getPixels(Image image, int width, int height) {
int [] pixels = new int [width * height];
try {
new PixelGrabber(image, 0 , 0 , width, height, pixels, 0 , width).grabPixels();
} catch (InterruptedException ex) {
Logger.getLogger(ImageUtils. class .getName()).
log(Level.SEVERE, null , ex);
}
return pixels;
}
/**
* Get a matrix that described the <code>pixels</code>.
* <p>
* For example, the result of the matrix like this:
* <center>
* 0000000000000000<br>
* 0000000000000000<br>
* 0001111111110000<br>
* 0011111111111000<br>
* 0011111111111100<br>
* 0011000000011100<br>
* 0000000000011100<br>
* 0000111111111100<br>
* 0011111111111100<br>
* 0011111110011100<br>
* 0111100000011100<br>
* 0111100000011100<br>
* 0111100000111100<br>
* 0111100001111110<br>
* 0011111111111100<br>
* 0011111111111100<br>
* 0001111111111100<br>
* 0000000000000000<br>
* 0000000000000000<br>
* </center>
* it describes the alphbet 'a'.
* </p>
* @param pixels the pixel array
* @param sparseFactor sparse factor
* @return a matrix that describes a alphbet
*/
public static int [][] getSymbolMatrix( int [] pixels, int sparseFactor) {
final int width = StdModelRepository.width;
final int height = StdModelRepository.height;
int [][] ret = new int [width][height];
for ( int i = 0 ; i < height; i ++ ) {
for ( int j = 0 ; j < width; j ++ ) {
if (pixels[i * width + j] == - 1 ) {
ret[j][i] = 0 ;
} else {
ret[j][i] = 1 ;
}
}
}
return ret;
}
/**
* Print the <code>matrix</code> under console.
* @param matrix the sepecified matrix data
*/
public static void displayMatrix( int [][] matrix) {
System.out.println( " " );
for ( int i = 0 ; i < matrix[ 0 ].length; i ++ ) {
for ( int j = 0 ; j < matrix.length; j ++ ) {
if (matrix[j][i] != 0 ) {
System.out.print( " * " );
} else {
System.out.print( " " );
}
}
System.out.println();
}
}
}
/*
* @(#)ImageTextRecognitor.java
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package cn.edu.ynu.sei.recognition;
import cn.edu.ynu.sei.recognition.util.StdModelRepository;
import cn.edu.ynu.sei.recognition.util.ImageUtils;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
/**
* Demonstrate recognition characters from a image.
* @author 88250
* @version 1.0.0.2, Mar 20, 2008
*/
public class ImageTextRecognitor {
private final static long serialVersionUID = 1L ;
private StdModelRepository smr = new StdModelRepository();
private BufferedImage bufferedImage;
/**
* Default constructor.
*/
public ImageTextRecognitor() {
try {
bufferedImage = ImageIO.read( new File( " a_yahei12.png " ));
} catch (IOException ex) {
Logger.getLogger(StdModelRepository. class .getName()).
log(Level.SEVERE, null , ex);
}
}
/**
* Return the matched character with sepecified image.
* @param symbolMatrix the matrix of sepecified image
* @return the character
*/
// TODO: the core algorithm
public char getMatchResult( int [][] symbolMatrix) {
char result = 0 ;
int tmpEvaluation = 100 ;
int evaluation = 0 ;
return result;
}
/**
* Main program entry.
* @param args should be <code>null</code>
*/
public static void main(String[] args) {
ImageTextRecognitor irt = new ImageTextRecognitor();
BufferedImage bi = irt.bufferedImage;
Image img = bi.getScaledInstance( 16 , 28 , BufferedImage.SCALE_FAST);
int [] testImgPixels = ImageUtils.getPixels(img, img.getWidth( null ),
img.getHeight( null ));
ImageUtils.displayMatrix(ImageUtils.getSymbolMatrix(testImgPixels, 2 ));
// irt.getMatchResult(ImageUtils.getPixels(bi,
// bi.getWidth(),
// bi.getHeight()));
}
}
* @(#)ImageTextRecognitor.java
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package cn.edu.ynu.sei.recognition;
import cn.edu.ynu.sei.recognition.util.StdModelRepository;
import cn.edu.ynu.sei.recognition.util.ImageUtils;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
/**
* Demonstrate recognition characters from a image.
* @author 88250
* @version 1.0.0.2, Mar 20, 2008
*/
public class ImageTextRecognitor {
private final static long serialVersionUID = 1L ;
private StdModelRepository smr = new StdModelRepository();
private BufferedImage bufferedImage;
/**
* Default constructor.
*/
public ImageTextRecognitor() {
try {
bufferedImage = ImageIO.read( new File( " a_yahei12.png " ));
} catch (IOException ex) {
Logger.getLogger(StdModelRepository. class .getName()).
log(Level.SEVERE, null , ex);
}
}
/**
* Return the matched character with sepecified image.
* @param symbolMatrix the matrix of sepecified image
* @return the character
*/
// TODO: the core algorithm
public char getMatchResult( int [][] symbolMatrix) {
char result = 0 ;
int tmpEvaluation = 100 ;
int evaluation = 0 ;
return result;
}
/**
* Main program entry.
* @param args should be <code>null</code>
*/
public static void main(String[] args) {
ImageTextRecognitor irt = new ImageTextRecognitor();
BufferedImage bi = irt.bufferedImage;
Image img = bi.getScaledInstance( 16 , 28 , BufferedImage.SCALE_FAST);
int [] testImgPixels = ImageUtils.getPixels(img, img.getWidth( null ),
img.getHeight( null ));
ImageUtils.displayMatrix(ImageUtils.getSymbolMatrix(testImgPixels, 2 ));
// irt.getMatchResult(ImageUtils.getPixels(bi,
// bi.getWidth(),
// bi.getHeight()));
}
}
测试
标准字符图像
测试字符图像
测试输出
init:deps-jar:
Compiling 2 source files to /home/daniel/Work/Sources/Java/ImageTextRecognition/build/classes
compile:
run:
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BUILD SUCCESSFUL (total time: 1 second)