import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.*;
public class ReadWatermark
{
static final int pWidth=352; // Pattern width
static final int pHeight=240; // Pattern height
static final int pxWidth=4; // Bit width
static final int pxHeight=5; // Bit height
static final int bWidth=88; // Bits table width
static final int bHeight=48; // Bits table height
static final int Black=0xFF000000; // Black = 0
static final int White=0xFFFFFFFF; // White = 1
static final String filenameSrc = "pattern.bmp"; // Stores the filename
public static byte[][] getPatternBits(BufferedImage image)
{
byte barcode[][] = new byte[bWidth][bHeight]; // Stores the bits
for (int y=0, i=0; y<pWidth; y+=pxWidth, i++)
for (int x=0, j=0; x<pHeight; x+=pxHeight, j++)
if (image.getRGB(y+1,x)==Black)
// we check y+1 to target correctly (see pattern)
barcode[i][j]=0; // got black
else
barcode[i][j]=1; // got white
return barcode;
}
public static BufferedImage readImage(File file)
{
try
{
return (ImageIO.read(file));
}
catch (IOException e)
{
return (null);
}
}
public static void main(String[] args)
{
byte barcode[][]; // Stores the bits
File fileSrc = new File(filenameSrc); // Create file reference
BufferedImage imageSrc=readImage(fileSrc); // Read file
if (imageSrc==null)
System.exit(1); // no file found
barcode=getPatternBits(imageSrc); // Get bits
for (int i=bWidth-1; i>=0; i--)
{ // Print the pattern (1 row here is 1 column there, right to left)
for (int j=bHeight-1; j>=0; j--)
System.out.print(barcode[i][j]);
System.out.println();
}
}
}
