Notes

/**
* This program is designed to decode a secret text message hidden within a digital image
*
* @author Sijia Liang
* @version 7/31/2016
*
*/
import java.awt.*;
import turtlegraphics.*;
class HideMessage
{
public void decodeMessage(String stegoObj)
{
Picture stegoObj1 = new Picture(stegoObj);
Pixel targetPixel = new Pixel(stegoObj1, 0, 0);
Color pixelColor = null;

int totalValue = 0; //sets ascii value to 0
int bitValue = 0;
int preValue = 0;
int base = 1;
int y = 1;
int counter = 0;

while(bitValue != 225)
{
for(int x = ((8 * y) - 1); x >= ((y - 1)*8); x -= 1)
{
targetPixel = stegoObj1.getPixel(x,0);
pixelColor = targetPixel.getColor();
bitValue = pixelColor.getRed();
preValue = bitValue * base;
totalValue += preValue;
base = base * 2;
counter = counter + 1;

if(bitValue == 225)
{
break;
}

if(counter == (8 * y))
{
y += 1;
char message = (char) totalValue;
System.out.print(message);
totalValue = 0;
bitValue = 0;
preValue = 0;
base = 1;
}
//end of increasing counter
}
//end of stopping loop
}
//end of loop
stegoObj1.show();
}
//end of converting binary to ascii/words
}
public class HideMessageTester
{
public static void main(String[] args)
{
String stegoObj = "C:\Users\School-pc\Desktop\CP1 Course Files\Module 8\Mod08 Documents\SecretMessage.bmp";
//Picture stegoObject = new Picture("C:\Users\School-pc\Desktop\CP1 Course Files\Module 8\Mod08 Documents\SecretMessage.bmp");
HideMessage stego = new HideMessage();

stego.decodeMessage(stegoObj);


}
//end of main method
}
//end of class