图像识别java代码 java图像识别技术

java 实现图片的文字识别

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。

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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 charImgs = new ArrayList();

/** * 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 codeimage .* @param image the sepecified image

* @param width width of the image

* @param height height of the image

* @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;

}

资源来自：

如何使用Java实现屏幕找图功能

测试代码

[java] view plain copy

public static void main(String[] args) throws Exception {

findImage4FullScreen(ImageCognition.SIM_ACCURATE_VERY);

}

public static void findImage4FullScreen(int sim) throws Exception {

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

int w = (int) screenSize.getWidth();

int h = 200;

Robot robot = new Robot();

BufferedImage screenImg = robot.createScreenCapture(new Rectangle(0, 0,

w, h));//对屏幕指定范围进行截图，保存到BufferedImage中

OutputStream out = new FileOutputStream("data/images/screen.png");

ImageIO.write(screenImg, "png", out);//将截到的BufferedImage写到本地

InputStream in = new FileInputStream("data/images/search.png");

BufferedImage searchImg = ImageIO.read(in);//将要查找的本地图读到BufferedImage

//图片识别工具类

ImageCognition ic = new ImageCognition();

ListCoordBean list = ic.imageSearch(screenImg, searchImg, sim);

for (CoordBean coordBean : list) {

System.out.println("找到图片,坐标是" + coordBean.getX() + ","

+ coordBean.getY());

//标注找到的图的位置

Graphics g = screenImg.getGraphics();

g.setColor(Color.BLACK);

g.drawRect(coordBean.getX(), coordBean.getY(),

searchImg.getWidth(), searchImg.getHeight());

g.setFont(new Font(null, Font.BOLD, 20));

g.drawString("←找到的图片在这里",

coordBean.getX() + searchImg.getWidth() + 5,

coordBean.getY() + 10 + searchImg.getHeight() / 2);

out = new FileOutputStream("data/images/result.png");

ImageIO.write(screenImg, "png", out);

}

}

额外的类

CoordBean

package cn.xt.imgCongnition;

public class CoordBean {

private int x;

private int y;

/**

* 获取x坐标

*

* @return x坐标

*/

public int getX() {

return x;

}

public void setX(int x) {

this.x = x;

}

/**

* 获取y坐标

*

* @return

*/

public int getY() {

return y;

}

public void setY(int y) {

this.y = y;

}

}

RgbImageComparerBean

package cn.xt.imgCongnition;

/**

* RGB 相关，图片相似度计算时使用

*

*/

public class RgbImageComparerBean {

/****** 颜色值数组，第一纬度为x坐标，第二纬度为y坐标 ******/

private int colorArray[][];

/*** 是否忽略此点，若为true，则不纳入比较的像素行列。 ***/

private boolean ignorePx[][];

/**** 图片的宽高 ****/

private int imgWidth;

private int imgHeight;

// 图片的像素总数

private int pxCount;

/**

* 获取图像的二维数组组成

*

* @return 图像的二维数组

*/

public int[][] getColorArray() {

return colorArray;

}

/**

* 要对比的像素总数,会自动筛选掉不对比的颜色

*

* @param pxCount

*/

public void setPxCount(int pxCount) {

this.pxCount = pxCount;

}

/**

* 设置颜色二维数组

*

* @param colorArray

* 颜色二维数组，一维为x轴，二维为y轴

*/

public void setColorArray(int[][] colorArray) {

this.colorArray = colorArray;

this.imgWidth = this.colorArray.length;

this.imgHeight = this.colorArray[0].length;

this.pxCount = this.imgWidth * this.imgHeight;

}

/**

* 是否忽略此点，若为true，则不纳入像素比较行列。

*

* @return 具体x，y坐标的那个像素点

*/

public boolean[][] getIgnorePx() {

return ignorePx;

}

/**

* 是否忽略此点，若为true，则不纳入像素比较行列。

*

* @param ignorePx

* 具体x，y坐标的那个像素点

*/

public void setIgnorePx(boolean[][] ignorePx) {

this.ignorePx = ignorePx;

}

/**

* 获取图像的宽度

*

* @return 图像宽度

*/

public int getImgWidth() {

return imgWidth;

}

/**

* 获取图像的高度

*

* @return 图像高度

*/

public int getImgHeight() {

return imgHeight;

}

/**

* 获取图像里像素的总数

*

* @return

*/

public int getPxCount() {

return pxCount;

}

}

Java 可不可以做图像识别的系统

当然可以。

一、纯JAVA开发的技术可行性，即JAVA是否能够实现图像识别的各种算法。

二、如果第一点没有问题，纯JAVA与C++相比，开发效率上的差异。效率要低很多，和具体问题有关。

三、如果第一点没有问题且第二点差异不太大时，纯JAVA与C++相比，相同算法的情况下，软件运行效率的差异。运行效率的差异也很大，也是和具体的算法有关。