/**
* Copyright 2016 By_syk
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.by_syk.graphiccr.core;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.imageio.ImageIO;
/**
* 第2类图形验证码识别
* <br />针对截至 2016-11-22 为止成都医学院、四川理工学院教务管理系统登录用的验证码
* <br />图形尺寸为 72*27
*
* @author By_syk
*/
public class GraphicC2Translator {
private static GraphicC2Translator translator = null;
private BufferedImage trainImg = null;
/**
* 元字符宽度
*/
private static final int UNIT_W = 13;
/**
* 元字符高度
*/
private static final int UNIT_H = 22;
/**
* 训练元字符数
*/
private static final int TRAIN_NUM = 32;
/**
* 所有元字符
*/
private static final char[] TRAIN_CHARS = {'0', '1', '2', '3', '4', '5', '6', '7', '8',/* '9',*/
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
/*'o', */'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y'/*, 'z'*/};
/**
* 有效像素颜色值
*/
private static final int TARGET_COLOR = Color.BLACK.getRGB();
/**
* 无效像素颜色值
*/
private static final int USELESS_COLOR = Color.WHITE.getRGB();
private GraphicC2Translator() {}
public static GraphicC2Translator getInstance() {
if (translator == null) {
translator = new GraphicC2Translator();
}
return translator;
}
/**
* 去噪
*
* @param picFile 图形验证码文件
* @return
* @throws Exception
*/
private BufferedImage denoise(File picFile) throws Exception {
BufferedImage img = ImageIO.read(picFile);
int width = img.getWidth();
int height = img.getHeight();
final int TARGET = 0xff000099;
for (int x = 0; x < width; ++x) {
for (int y = 0; y < height; ++y) {
if (img.getRGB(x, y) == TARGET) {
img.setRGB(x, y, TARGET_COLOR);
} else {
img.setRGB(x, y, USELESS_COLOR);
}
}
}
return img;
}
/**
* 分割元字符
*
* @param img
* @return
* @throws Exception
*/
private List<BufferedImage> split(BufferedImage img) throws Exception {
List<BufferedImage> subImgs = new ArrayList<BufferedImage>();
subImgs.add(img.getSubimage(4, 0, UNIT_W, UNIT_H));
subImgs.add(img.getSubimage(16, 0, UNIT_W, UNIT_H));
subImgs.add(img.getSubimage(28, 0, UNIT_W, UNIT_H));
subImgs.add(img.getSubimage(40, 0, UNIT_W, UNIT_H));
return subImgs;
}
/**
* 取出训练数据
*
* @return
* @throws Exception
*/
private BufferedImage loadTrainData() throws Exception {
if (trainImg == null) {
trainImg = ImageIO.read(this.getClass().getResourceAsStream("/resources/img/2/train.png"));
// File file = new File(this.getClass().getResource("/resources/img/2/train.png").getPath());
// File file = new File("E:/JavaWebProjects/SchTtable/reserve/成都医学院/ImageCode/train/train.png");
// trainImg = ImageIO.read(file);
}
return trainImg;
}
/**
* 将训练元字符装在一起
*
* @param trainImg
* @param smallImg
* @param ch
* @return
*/
private boolean addTrainImg(BufferedImage trainImg, BufferedImage smallImg, char ch) {
int which = Arrays.binarySearch(TRAIN_CHARS, ch);
int x = -1;
int y = -1;
for (int i = 0; i < TRAIN_NUM; ++i) {
if (trainImg.getRGB(i * UNIT_W, which * (UNIT_H + 1) + UNIT_H) != TARGET_COLOR) {
x = i * UNIT_W;
y = which * (UNIT_H + 1);
break;
}
}
if (x == -1 || y == -1) {
return false;
}
for (int i = 0; i < UNIT_W; ++i) {
for (int j = 0; j < UNIT_H; ++j) {
trainImg.setRGB(x + i, y + j, smallImg.getRGB(i, j));
}
}
trainImg.setRGB(x, y + UNIT_H, TARGET_COLOR);
return true;
}
/**
* 训练
*
* @param rawDir
* @param targetTrainFile
* @return
*/
public boolean train(File rawDir, File targetTrainFile) {
try {
BufferedImage trainImg = new BufferedImage(UNIT_W * TRAIN_NUM, (UNIT_H + 1) * TRAIN_CHARS.length, BufferedImage.TYPE_INT_ARGB);
for (File file : rawDir.listFiles()) {
BufferedImage img = denoise(file);
List<BufferedImage> listImg = split(img);
String[] parts = file.getName().split("\\.");
char[] chars = parts[0].toCharArray();
char[] addFlags;
if (parts.length > 2) {
addFlags = parts[1].toCharArray();
} else {
addFlags = new char[]{'1', '1', '1', '1'};
}
for (int i = 0, len = listImg.size(); i < len; ++i) {
if (addFlags[i] == '1') {
addTrainImg(trainImg, listImg.get(i), chars[i]);
}
}
}
return ImageIO.write(trainImg, "PNG", targetTrainFile);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
/**
* 单元识别
*
* @param img
* @param trainImg
* @return
*/
private char recognize(BufferedImage img, BufferedImage trainImg) {
char result = ' ';
int width = img.getWidth();
int height = img.getHeight();
int min = width * height; // 最小差异像素数
for (int i = 0; i < TRAIN_NUM; ++i) {
for (int j = 0; j < TRAIN_CHARS.length; ++j) {
int startX = UNIT_W * i;
int startY = (UNIT_H + 1) * j;
if (trainImg.getRGB(startX, startY + UNIT_H) != TARGET_COLOR) {
continue;
}
int count = 0; // 差异像素数
for (int x = 0; x < UNIT_W; ++x) {
for (int y = 0; y < UNIT_H; ++y) {
count += (img.getRGB(x, y) != trainImg.getRGB(startX + x, startY + y) ? 1 : 0);
if (count >= min) {
break;
}
}
}
if (count < min) {
min = count;
result = TRAIN_CHARS[j];
}
}
}
return result;
}
/**
* 识别
*
* @param picFile 图形验证码文件
* @return
*/
public String translate(File picFile) {
String result = "";
try {
BufferedImage img = denoise(picFile);
List<BufferedImage> listImg = split(img);
BufferedImage trainImg = loadTrainData();
for (BufferedImage bi : listImg) {
result += recognize(bi, trainImg);
}
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}
