java简单图片、验证码识别源码

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最新推荐文章于 2023-07-31 17:30:00 发布

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本文详细介绍了使用Java实现的数字验证码识别器的工作原理，包括图像分割、单色位图转换、数字匹配等关键步骤。

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java简单图片、验证码识别源码
package com.miaocn;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.media.jai.JAI;
import javax.media.jai.RenderedOp;

/**
* 数字验证码识别器（用于识别xxx系统的图片验证码）
*
* 算法如下：分析验证码图片结构，将其分隔成4个独立的数字图片，把四个独立的数字图片处理成单色位图。
* 把单色位图转换为0、1数组，然后分别和0-9的字模进行匹配，得到图片上的数字信息。
*
* @version 1.0 2009-7-7
* @author huangyuanmu
* @since JDK 1.5.0_8
*/
public class NumberVerCodeIdentifier {

static
{
System.setProperty("com.sun.media.jai.disableMediaLib", "true");
}

//字典
private static String a0 = "000111100";
private static String a1 = "001111110";

private static String a2 = "011111110";
private static String a22 = "011011000";

private static String a3 = "001111100";
private static String a4 = "000000110";

private static String a5 = "111111111";//前
private static String a52 = "011111111";//前
private static String a53 = "001011000";//后

private static String a6 = "000111100000111100";
private static String a7 = "001100000";
private static String a8 = "001111100000111100";
private static String a9 = "001111000";

public String recognize(BufferedImage image){

String result = "";

BufferedImage newim[] = new BufferedImage[4];
if(null == image){
throw new RuntimeException("iamage为null");
}
// 将图像分成四块，因为要处理的文件有四个数字。
newim[0] = generateSingleColorBitMap(image.getSubimage(7, 5, 8, 11));
newim[1] = generateSingleColorBitMap(image.getSubimage(20, 5, 8, 11));
newim[2] = generateSingleColorBitMap(image.getSubimage(33, 5, 8, 11));
newim[3] = generateSingleColorBitMap(image.getSubimage(46, 5, 8, 11));

for (int k = 0; k < 4; k++) {
int iw = newim[k].getWidth(null);
int ih = newim[k].getHeight(null);

StringBuffer numstr = new StringBuffer();
// 因为是二值图像，这里的方法将像素读取出来的同时，转换为0，1的图像数组。
for (int i = 0; i < ih; i++) {
for (int j = 0; j < iw; j++) {

int t = newim[k].getRGB(j, i);
if (t == -1)
numstr.append("0");
else
numstr.append("1");;

}
}
// 得到像匹配的数字串。

String straaa = numstr.toString().substring(0, 9) + numstr.toString().substring(79);
// System.out.println(numstr.toString());

boolean bye = true;
if(straaa.equals(a6))
{
result = result+6;
//System.out.println(6);
bye = false;
}
if(straaa.equals(a8))
{
result = result+8;
//System.out.println(8);
bye = false;
}

if(numstr.toString().substring(0,9).equals(a5) || numstr.toString().substring(0,9).equals(a52) || numstr.toString().substring(79).equals(a53)){
result = result+5;
//System.out.println(5);
bye = false;
}

String aaaaa = numstr.toString().substring(79);

if(bye){
if(aaaaa.equals(a0)){
result = result+0;
//System.out.println(0);
}

if(aaaaa.equals(a1)){
result = result+1;//System.out.println(1);
}
if(aaaaa.equals(a2) || aaaaa.equals(a22)){
result = result+2;//System.out.println(2);
}
if(aaaaa.equals(a3)){
result = result+3;//System.out.println(3);
}

if(aaaaa.equals(a4)){
result = result+4;// System.out.println(4);
}

if(aaaaa.equals(a7)){
result = result+7;//System.out.println(7);
}

if(aaaaa.equals(a9)){
result = result+9;//System.out.println(9);
}
}

}
// System.out.println(result);
return result;

}

/**
* 单色位图转换
* @return
*/
private static BufferedImage generateSingleColorBitMap(Image colorImage) {
BufferedImage image = new BufferedImage(8, 11,
BufferedImage.TYPE_BYTE_GRAY);
Graphics g = image.getGraphics();
g.drawImage(colorImage, 0, 0, null);
g.dispose();
RenderedOp ro = JAI.create("binarize", image, new Double(100));
BufferedImage bi = ro.getAsBufferedImage();
return bi;
}

/**
* 测试
* @author sunyang
*/
public static void main(String args[]){

NumberVerCodeIdentifier nvi = new NumberVerCodeIdentifier();

String res="";
try {
res = nvi.recognize(ImageIO.read(new File("d:\\111.bmp")));

//res = nvi.recognize(ImageIO.read(new URL("http://******.com/validationCode.jsp")));
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(res);
}
}