Java- how to resize an image by expanding a pixel diagonaly

Question

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import java.awt.image.WritableRaster;

public class drim {
   public static void drimage() {
      try {
         BufferedImage input =
            ImageIO.read( new File( "/root/project/de.jpg" ));
         int w = input.getWidth();
         int h = input.getHeight();
         int h1 = h * 2;
         int w1 = w * 2;
         BufferedImage im = new BufferedImage( w1, h1,
            BufferedImage.TYPE_BYTE_BINARY );
         WritableRaster raster = im.getRaster();
         for( int i = 0; i < w; i++ ) {
            for( int j = 0; j < h; j++ ) {
               int rgb = input.getRGB( i, j );
               if( rgb == -1 ) {
                  raster.setSample( i * 2, j * 2, 0, 1 );
                  raster.setSample( i * 2, ( j * 2 ) + 1, 0, 0 );
                  raster.setSample( ( i * 2 ) + 1, j * 2, 0, 0 );
                  raster.setSample( ( i * 2 ) + 1, ( j * 2 ) + 1, 0, 1 );
               } else {
                  raster.setSample( i * 2, j * 2, 0, 0 );
                  raster.setSample( i * 2, ( j * 2 ) + 1, 0, 1 );
                  raster.setSample( ( i * 2 ) + 1, j * 2, 0, 1 );
                  raster.setSample( ( i * 2 ) + 1, ( j * 2 ) + 1, 0, 0 );
               }
            }
         }
         ImageIO.write( im, "JPG", new File( "/root/project/dde.jpg" ) );
      }
      catch( Exception e )
      {
         e.printStackTrace();
      }
   }

   public static void main( String[] args ) throws IOException {
      drimage();
   }
}

The above given is a java code for resizing the image by substituting each pixel by a group of 4 pixels keeping the diagonal pixel in the group with the same color as in the original image.The images we consider is a binary image with black and white colors. But the problem now is how to retrieve the original image from the resized image. Please help us.

Java- how to resize an image by expanding a pixel diagonaly

Answers (1)

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