Java_最不重要位替换(LSB)基于24位BMP图片

隐写术的一个简单示例

向BMP图片中隐藏一段文字并保存,从保存的图片中提取文字.

原理:把需要隐藏的文本信息转换成二进制字符流,再将其拆分成一个个的0和1,隐藏在像素数据(RGB字节)中,因对RGB的改动很小,添加了隐藏信息的bmp图片和原始bmp图片看起来"一模一样";利用相反的手法可以将数据提取出来.

本程序只是隐写术的一个简单的具体实现.

bmp图片存储格式参考这一片文章: https://www.cnblogs.com/Matrix_Yao/archive/2009/12/02/1615295.html

注:保存后图片变形问题已解决于2019/6/22 日

Java代码:

import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.plaf.FontUIResource;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.time.LocalTime;
import java.util.Arrays;
import java.util.Enumeration;/*** @author lw* @date 2019/6/20 20:43*/
public class InfoHideToBmpImage extends JFrame {private int displayWidth, displayHeight;private JTextArea textArea;private InfoHideToBmpImage() {Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();displayWidth = (int) (screenSize.getWidth() * 0.7);displayHeight = (int) (screenSize.getHeight() * 0.7);initFrame();}private void initFrame() {Util.setUIFont(new FontUIResource("微软雅黑", 0, 20));setLayout(new BorderLayout());setJMenuBar(initMenuBar());add(initTextAreaJScrollPane(), BorderLayout.SOUTH);setTitle("LSB隐藏器");setSize(displayWidth, displayHeight);//设置窗体出现在屏幕中间setLocationRelativeTo(null);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setVisible(true);}private final String FILE_MENU_NAME = "File";private final String OPEN_MENU_ITEM_NAME = "Open";private final String SAVE_MENU_ITEM_NAME = "Save";private final String LSB_MENU_NAME = "LSB";private final String HIDE_MENU_ITEM_NAME = "Hide";private final String SHOW_MENU_ITEM_NAME = "Show";private final String BMP = "bmp";private JMenuBar initMenuBar() {JMenuBar menuBar = new JMenuBar();MenuItemListener listener = new MenuItemListener();JMenu menu = new JMenu(FILE_MENU_NAME);JMenuItem openItem = new JMenuItem(OPEN_MENU_ITEM_NAME);openItem.addActionListener(listener);JMenuItem saveItem = new JMenuItem(SAVE_MENU_ITEM_NAME);saveItem.addActionListener(listener);menu.add(openItem);menu.add(saveItem);menuBar.add(menu);menu = new JMenu(LSB_MENU_NAME);JMenuItem hideItem = new JMenuItem(HIDE_MENU_ITEM_NAME);hideItem.addActionListener(listener);JMenuItem showItem = new JMenuItem(SHOW_MENU_ITEM_NAME);showItem.addActionListener(listener);menu.add(hideItem);menu.add(showItem);menuBar.add(menu);return menuBar;}class MenuItemListener implements ActionListener {private final String DEFAULT_CURRENT_DIRECTORY_PATH = "C:/Users/LW/Desktop";private JFileChooser fileChooser;private BmpImageInfo imageInfo;private static final byte OPEN_FILE = 1;private static final byte SAVE_FILE = 2;MenuItemListener() {fileChooser = new JFileChooser(DEFAULT_CURRENT_DIRECTORY_PATH);fileChooser.setFileFilter(new FileNameExtensionFilter("24位位图(*.bmp)", BMP));fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);}@Overridepublic void actionPerformed(ActionEvent e) {switch (e.getActionCommand()) {case OPEN_MENU_ITEM_NAME: {openHandler();break;}case SAVE_MENU_ITEM_NAME: {saveHandler();break;}case HIDE_MENU_ITEM_NAME: {hideHandler();break;}case SHOW_MENU_ITEM_NAME: {showHandler();break;}default: {break;}}}private void showHandler() {if (null == imageInfo) {textArea.setText("请选择图片后重试");return;}String info = Util.analysisHideInfo(imageInfo);if ("".equals(info.trim())) {textArea.setText("提示信息: 解析出来的信息为空");return;}textArea.setText(info);}private void hideHandler() {if (imageInfo == null || imageInfo.blue == null) {textArea.setText("请打开bmp图片文件后重试!");return;}String text = textArea.getText();if (null == text || text.trim().length() <= 0) {textArea.setText("请在文本框中输入需要隐藏的文本信息后重试");return;}if (Util.hideInfoToBmp(imageInfo, textArea.getText())) {textArea.setText("隐藏文本信息成功");return;}textArea.setText("隐藏文本信息失败");}private void openHandler() {File file = selectFile(OPEN_FILE);if (null == file) {return;}imageInfo = Util.analysisBmpImage(file);showBmpImage(imageInfo);textArea.setText("打开图片文件成功!");if (imageInfo.getBfOffBits() > BmpImageInfo.DEFAULT_BF_OFF_BITS) {textArea.append("  图片文件有可能存在隐藏信息");}}private void saveHandler() {File file = new File(generateSaveFileName());fileChooser.setSelectedFile(file);file = selectFile(SAVE_FILE);Util.saveBmpImage(imageInfo, file);textArea.setText("保存图片文件成功");}private String generateSaveFileName() {File selectedFile = fileChooser.getSelectedFile();String name = selectedFile.getName();name = name.substring(name.lastIndexOf('_') + 1);String parent = selectedFile.getParent();String now = LocalTime.now().toString().replaceAll(":", "-");return String.join("", parent, "/", now, "_", name);}private File selectFile(byte type) {// 不是确认if (type == OPEN_FILE && JFileChooser.APPROVE_OPTION != fileChooser.showOpenDialog(null)) {return null;}if (type == SAVE_FILE && JFileChooser.APPROVE_OPTION != fileChooser.showSaveDialog(null)) {return null;}File selectedFile = fileChooser.getSelectedFile();String fileName = selectedFile.getName();String suffixName = fileName.substring(fileName.lastIndexOf(".") + 1);if (!BMP.equals(suffixName)) {System.out.println("非BMP类型文件");return null;}return selectedFile;}}private JScrollPane initTextAreaJScrollPane() {JTextArea textArea = new JTextArea();this.textArea = textArea;textArea.setLineWrap(true);textArea.setWrapStyleWord(true);JScrollPane scrollPane = new JScrollPane(textArea);scrollPane.setPreferredSize(new Dimension(displayWidth, 200));scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);return scrollPane;}private void showBmpImage(BmpImageInfo imageInfo) {DrawPanel drawPanel = new DrawPanel(imageInfo);JScrollPane scrollPane = new JScrollPane();scrollPane.setViewportView(drawPanel);scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);add(scrollPane);// 刷新界面setVisible(true);}/*** 绘图面板*/class DrawPanel extends JPanel {BmpImageInfo bmpImageInfo;DrawPanel(BmpImageInfo imageInfo) {bmpImageInfo = imageInfo;// 将画板撑大,这样当图片长宽过大时 jScrollPane 才会显示滚动条setPreferredSize(new Dimension(imageInfo.getImageWidth(), imageInfo.getImageHeight()));}@Overridepublic void paint(Graphics g) {super.paint(g);if (null == bmpImageInfo) {return;}int height = bmpImageInfo.getImageHeight();int width = bmpImageInfo.getImageWidth();// 水平居中x 初始坐标int initX = 0;if (displayWidth > width) {Point location = getLocation();initX = (int) location.getX() + ((displayWidth - width) >> 1);}// 这里只考虑了 height 为正数的情况for (int h = 0; h < height; h++) {for (int w = 0; w < width; w++) {g.setColor(new Color(bmpImageInfo.red[h][w], bmpImageInfo.green[h][w], bmpImageInfo.blue[h][w]));g.fillRect(w + initX, h, 1, 1);}}}}public static void main(String[] args) {new InfoHideToBmpImage();}}class BmpImageInfo {/*** 默认偏移量*/static final int DEFAULT_BF_OFF_BITS = 54;private int height = -1;private int width = -1;byte[] fileHeader = new byte[14];byte[] informationHeader = new byte[40];/*** 位图数据数组,即一个像素的三个分量的数据数组*/int[][] red, green, blue;/*** 类型是否是位图** @return true/false*/boolean isBmpType() {return fileHeader[0] == 0X42 && fileHeader[1] == 0X4D;}/*** 是否是24位bmp** @return true : 是;false: 否*/boolean is24BitCount() {return informationHeader[15] == 0 && informationHeader[14] == 24;}/*** 初始化位图数据矩阵** @return true:成功;false:失败*/boolean initBitmapDataArr() {int imageWidth = getImageWidth();int imageHeight = getImageHeight();boolean flag = imageHeight != 0 && imageWidth != 0;if (flag) {red = new int[imageHeight][imageWidth];green = new int[imageHeight][imageWidth];blue = new int[imageHeight][imageWidth];}return flag;}/*** 获取偏移量** @return 偏移量*/int getBfOffBits() {return bytesToInt(Arrays.copyOfRange(fileHeader, 10, 14));}/*** 设置偏移量** @param offset 偏移量*/void setBfOffBits(int offset) {if (offset <= DEFAULT_BF_OFF_BITS) {return;}byte[] bs = intToBytes(offset);int index = 10, bi = 0;while (index < fileHeader.length) {fileHeader[index] = bs[bi++];index++;}}int getImageWidth() {if (width == -1) {width = bytesToInt(Arrays.copyOfRange(informationHeader, 4, 8));}return width;}int getImageHeight() {// 需要注意的是 height 有可能为负数if (height == -1) {height = bytesToInt(Arrays.copyOfRange(informationHeader, 8, 12));}return height;}private int bytesToInt(byte[] bytes) {if (null == bytes || bytes.length <= 0) {return 0;}return (bytes[3] & 0xff << 24) | (bytes[2] & 0xff) << 16 | (bytes[1] & 0xff) << 8 | bytes[0] & 0xff;}private byte[] intToBytes(int integer) {byte[] bytes = new byte[4];bytes[3] = (byte) (integer >> 24);bytes[2] = (byte) (integer >> 16);bytes[1] = (byte) (integer >> 8);bytes[0] = (byte) (integer);return bytes;}
}class Util {private Util() {}/*** 设置全局页面字体大小** @param f FontUIResource实例*/static void setUIFont(FontUIResource f) {Enumeration<Object> keys = UIManager.getDefaults().keys();while (keys.hasMoreElements()) {Object key = keys.nextElement();if (UIManager.get(key) instanceof FontUIResource) {UIManager.put(key, f);}}}private static final String END_BINARY_STR = "0101010101010101";private static final char VALUE_0 = '0';static boolean hideInfoToBmp(BmpImageInfo imageInfo, String text) {imageInfo.setBfOffBits(imageInfo.getBfOffBits() + 1);String binary = toBinary(text).concat(END_BINARY_STR);char[] chars = binary.toCharArray();int i = 0, j = 0, cnt = 0, len = chars.length;for (; i < imageInfo.getImageHeight(); i++) {for (; j < imageInfo.getImageWidth(); j++) {imageInfo.blue[i][j] = getModifyBitData(imageInfo.blue[i][j], chars[cnt++]);if (cnt >= len) {return true;}imageInfo.green[i][j] = getModifyBitData(imageInfo.green[i][j], chars[cnt++]);if (cnt >= len) {return true;}imageInfo.red[i][j] = getModifyBitData(imageInfo.red[i][j], chars[cnt++]);if (cnt >= len) {return true;}}}imageInfo.setBfOffBits(BmpImageInfo.DEFAULT_BF_OFF_BITS);return false;}private static int getModifyBitData(int oldValue, char c) {// 0 ASCLL 48if (c == VALUE_0) {return oldValue & 0XE;}return oldValue | 0X1;}static String analysisHideInfo(BmpImageInfo imageInfo) {if (imageInfo.getBfOffBits() == BmpImageInfo.DEFAULT_BF_OFF_BITS) {return "";}StringBuilder binStrBuilder = new StringBuilder(imageInfo.blue[0].length << 3);StringBuilder wordBin = new StringBuilder(16);int cnt = 0;flag:for (int i = 0; i < imageInfo.getImageHeight(); i++) {for (int j = 0; j < imageInfo.getImageWidth(); j++) {wordBin.append(imageInfo.blue[i][j] & 0X1);if (++cnt >= 16) {if (isEndWithAppend(binStrBuilder, wordBin)) {break flag;}cnt = 0;}wordBin.append(imageInfo.green[i][j] & 0X1);if (++cnt >= 16) {if (isEndWithAppend(binStrBuilder, wordBin)) {break flag;}cnt = 0;}wordBin.append(imageInfo.red[i][j] & 0X1);if (++cnt >= 16) {if (isEndWithAppend(binStrBuilder, wordBin)) {break flag;}cnt = 0;}}}return toString(binStrBuilder.toString());}/*** 添加内容,并判断是否结束** @param binStrBuilder 二进制串* @param wordBin       一个字的二进制串* @return true:结束;false:否*/private static boolean isEndWithAppend(StringBuilder binStrBuilder, StringBuilder wordBin) {if (END_BINARY_STR.equals(wordBin.toString())) {return true;}binStrBuilder.append(wordBin);wordBin.delete(0, 16);return false;}/*** 解析bmp图片*/static BmpImageInfo analysisBmpImage(File file) {BmpImageInfo imageInfo = new BmpImageInfo();if (!isWindowOperatingSystem()) {System.out.println("非windows操作系统,终止");return imageInfo;}if (null == file) {return imageInfo;}try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file))) {bis.read(imageInfo.fileHeader);if (!imageInfo.isBmpType()) {System.out.println("非bmp类型文件");return imageInfo;}bis.read(imageInfo.informationHeader);if (!imageInfo.is24BitCount()) {System.out.println("非24位bmp类型文件");return imageInfo;}if (imageInfo.getBfOffBits() > BmpImageInfo.DEFAULT_BF_OFF_BITS) {System.out.println("bmp文件偏移超过默认偏移量,可能存在隐藏信息");bis.skip(imageInfo.getBfOffBits() - BmpImageInfo.DEFAULT_BF_OFF_BITS);}if (!imageInfo.initBitmapDataArr()) {System.out.println("初始化位图数据矩阵失败,可能未读取信息头数据");return imageInfo;}int imageWidth = imageInfo.getImageWidth();// 通过计算得到每行计算机需要填充的字符数。// 为什么要填充？这是因为windows系统在扫描数据的时候，每行都是按照4个字节的倍数来读取的。// 因为图片是由每个像素点组成。而每个像素点都是由3个颜色分量来构成的，而每个分量占据1个字节。// 因此在内存存储中实际图片数据每行的长度是width*3int skipCount = getSkipCount(imageWidth);int imageHeight = imageInfo.getImageHeight();// 这里需要注意，因为根据bmp的保存格式。// 位图数据中height的值如果是正数的话:// 那么数据就是按从下到上，从左到右的顺序来保存。这个称之为倒向位图。// 反之就是按从上到下，从左到右的顺序来保存。这个则称之为正向位图。if (imageHeight < 0) {// todo 大多数BMP位图是倒向的位图，imageHeight是正值,所以负值的情况暂未实现return null;}for (int i = imageHeight - 1; i >= 0; i--) {for (int j = 0; j < imageWidth; j++) {// 这里遍历的时候，一定要注意本来像素是有RGB来表示，// 但是在存储的时候由于windows是小段存储，所以在内存中是BGR顺序。imageInfo.blue[i][j] = bis.read();imageInfo.green[i][j] = bis.read();imageInfo.red[i][j] = bis.read();}// 跳过每一行的补0项 ,网上有些是在j==0时进行跳过,表示傻傻不明白bis.skip(skipCount);}} catch (IOException e) {e.printStackTrace();}return imageInfo;}/*** 获取填充的补0数** @param width 图像像素宽度* @return 跳过数目*/private static int getSkipCount(int width) {int skipCount = 0;int m = width * 3 % 4;if (m != 0) {skipCount = 4 - m;}return skipCount;}/*** 保存bmp图片** @param imageInfo BmpImageInfo 实例* @param file      保存文件*/static void saveBmpImage(BmpImageInfo imageInfo, File file) {if (null == imageInfo || null == file) {return;}try (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file))) {bos.write(imageInfo.fileHeader);bos.write(imageInfo.informationHeader);int bfOffBits = imageInfo.getBfOffBits();// 写入多余的偏移量if (bfOffBits > BmpImageInfo.DEFAULT_BF_OFF_BITS) {bos.write(new byte[bfOffBits - BmpImageInfo.DEFAULT_BF_OFF_BITS]);}int height = imageInfo.getImageHeight();int width = imageInfo.getImageWidth();int skipCount = getSkipCount(width);for (int h = height - 1; h >= 0; h--) {for (int w = 0; w < width; w++) {int blue = imageInfo.blue[h][w];int green = imageInfo.green[h][w];int red = imageInfo.red[h][w];bos.write(blue);bos.write(green);bos.write(red);}if (skipCount > 0) {bos.write(new byte[skipCount]);}}} catch (IOException e) {e.printStackTrace();}}private static boolean isWindowOperatingSystem() {String osName = System.getProperty("os.name");return osName.startsWith("Window");}private static String[] PREFIX_POOL = {"0", "00", "000", "0000", "00000", "000000", "0000000", "00000000","000000000", "0000000000", "00000000000", "000000000000","0000000000000", "00000000000000", "000000000000000"};/*** 字符串转换成二进制流** @param str 字符串* @return 二进制流*/private static String toBinary(String str) {if (null == str || str.trim().length() == 0) {return null;}char[] strChar = str.toCharArray();StringBuilder result = new StringBuilder(strChar.length << 4);for (int i = 0; i < strChar.length; i++) {// 二进制ASCII码String s = Integer.toBinaryString(strChar[i]);// 补0if (s.length() < 16) {s = PREFIX_POOL[15 - s.length()].concat(s);}result.append(s);}return result.toString();}/*** 二进制流转换成字符串** @param binaryString 二进制流* @return 字符串*/private static String toString(String binaryString) {if (null == binaryString || binaryString.trim().length() == 0) {return null;}int len = binaryString.length();StringBuilder sb = new StringBuilder(len >> 4);int step = 16;for (int i = 0; i < len; i += step) {// 将ascll码强转成字符sb.append((char) (int) Integer.parseInt(binaryString.substring(i, i + step), 2));}return sb.toString();}
}

程序操作步骤:

file-->open,在文本域输入要保存的文本信息,LSB-->hide,file-->save, file-->open(打开刚才保存的文件),LSB-->show.

效果图:

1.打开bmp文件

-----------------------------原始版本效果图--------------------------------

Java_最不重要位替换(LSB)基于24位BMP图片相关推荐

基于STM32的BMP图片解码灰度化以及缩放
平台:STM32F1+FATFS+SD卡基于STM32的BMP图片处理处理结果原图 test.bmp 灰度图 gray.bmp 缩放 zoom.bmp 代码实现调试过程遇到的几个问题双线性插 ...
ip后面的斜杠24是什么意思？（/24）（子网掩码）（32位中的前24位为1，即255.255.255.0，用二进制表示为：11111111.11111111.11111111.00000000）
是子网掩码,表示32位中的前24位为1,即255.255.255.0,用二进制表示为:11111111.11111111.11111111.00000000 参考文章:ip地址后面的斜杠24是什么意思 ...
32位全彩色和24位全彩色有啥区别
32位真彩其实是不准确的说法,严格的说,只有24位真彩色,颜色数为2的24次方也就是1677万色左右,由于这已经是人眼能分辨的颜色极限,所以叫做真彩色.32位色是和24位真彩色颜色数相同,只不过增加了 ...
matlab实现基于24位真彩色BMP图像的文件信息隐藏方法（实验内容）
提示:文章写完后,目录可以自动生成,如何生成可参考右边的帮助文档文章目录一.24位真彩色BMP图像 1.简介 2.文件格式二.算法(四种) 三.matlab实现 1.图像文件尾部添加信息 2.位 ...
node 16位转24位_同时将24位和32位BMP图像顺时针旋转90度
上一次我们将24位的皮卡丘旋转了90度,但是后来改需求了...要求把32位的.bmp文件也能够旋转90度.上次就懵逼的我继续懵逼,只好继续转向CSDN求助. 浏览了各种求助帖(还找到了数年前的信科大一 ...
32位真彩色与24位真彩色区别
真彩色是指图像中的每个像素值都分成R.G.B三个基色分量,每个基色分量直接决定其基色的强度,这样产生的色彩称为真彩色.真彩色图像是一种用三个或更多字节描述像素的计算机图像存储方式. 真彩色-表示方法 ...
32位全彩色与24位全彩色有啥区别
真彩色是指图像中的每个像素值都分成R.G.B三个基色分量,每个基色分量直接决定其基色的强度,这样产生的色彩称为真彩色.真彩色图像是一种用三个或更多字节描述像素的计算机图像存储方式. 计算 ...
基于24位Δ-ΣADC和FPGA的高精度数据采集系统开发
欢迎订阅<FPGA学习入门100例教程>.<MATLAB学习入门100例教程> 目录一.理论基础二.核心程序三.测试结果一.理论基础
【图片位深度改变】24位深度转8位深度
代码如下: """ 2020.09.26:alian 改变图片的位深度 """ from PIL import Image import n ...

Java_最不重要位替换(LSB)基于24位BMP图片

注:保存后图片变形问题已解决于2019/6/22 日

Java_最不重要位替换(LSB)基于24位BMP图片相关推荐

最新文章

热门文章

Java_最不重要位替换(LSB)基于24位BMP图片

注:保存后图片变形问题已解决 于2019/6/22 日

Java_最不重要位替换(LSB)基于24位BMP图片相关推荐

最新文章

热门文章

注:保存后图片变形问题已解决于2019/6/22 日