我试图改变图像像素的LSB值,使得它与字符串“abc”匹配但添加1或0与奇值的像素被返回0 不一致值值这里是代码:改变LSB的图像RGB值给予
public static void main(String[] args) {
BufferedImage img = null;
try {
img = ImageIO.read(new File("a.jpg"));
} catch (IOException ex) {
}
int pixel[] = img.getRGB(0, 0, img.getWidth(), img.getHeight(), null, 0, img.getWidth());
String s = "abc";
byte[] b = s.getBytes();
String f = "";
for (int i = 0; i < b.length; i++) {
f += Integer.toBinaryString(b[i]);
}
f.trim();
int[] newpixel = new int[pixel.length];
for (int i = 0; i < pixel.length; i++) {
if (i < f.length()) {
if (pixel[i] % 2 == 0) {
if (f.charAt(i) == '0') {
newpixel[i] = pixel[i];
}
if (f.charAt(i) == '1') {
newpixel[i] = pixel[i] + 1;
}
}
if (pixel[i] % 2 == 1) {
if (f.charAt(i) == '0') {
newpixel[i] = pixel[i] - 1;
}
if (f.charAt(i) == '1') {
newpixel[i] = pixel[i];
}
}
} else {
newpixel[i] = pixel[i];
}
}
o:
for (int i = 0; i < img.getWidth() * img.getHeight(); i++) {
if (i < f.length()) {
System.out.print(" " + f.charAt(i) + ":(" + pixel[i] + "," + newpixel[i] + ")");
} else {
break o;
}
}
}
并且输出是:
1:( - 11235948,-11235947)1:( - 11893363,0)0:( - 11893617,0) 0:( - 10577497,0)0:( - 11695976,-11695976)0:( - 12090996,-12090996)1:( - 11170168,-11170167)1:( - 10775924,-10775923)1:( - 972 0:( - 9658965,0)0:( - 9856341,0)0:( - 11236466,-11236466)1:( - 11564174,-11564173)0:( - 11431819,0)1: 10380136,-10380135)1:( - 10973290,-10973289)0:( - 12093056,-12093056)0:( - 10842985,0)0:( - 10118999,0)1:( - 11368034,-11368033)1: (-11630686,-11630685)
:但我认为你的代码会使代码的提取有点困难。你可以建议我如何提取字符串。 – 2014-10-29 16:20:11
我已经用提取snipet更新了答案。 – Reti43 2014-10-29 17:37:49
:在将newpixel写入jpg文件时,应该是什么颜色模型?我尝试了几乎所有类型的颜色模型,但提取并不成功,虽然我的代码在使用像素数组时工作正常。 – 2014-11-06 15:32:12