Java(TM) Boutique - Using Rasters for Image Processing, Part 2

Listing 6: Applying a BandCombineOp filter to a raster to obtain a cubist style image.


Listing-ul RasterBandCombineOp.java

import java.awt.*;
import java.awt.image.*;

class FilterRaster extends Frame{

Image IMG=null;
//the Image object used for obtain a BufferedImage object
BufferedImage BI=null;
//the BufferedImage object from witch the raster will be extracted

//the table of values
float[][] BC={{-1.0f,  2.0f, 20.0f},
                      {-2.0f, 1.0f, 0.0f},
                     {1.0f,  0.0f, -3.0f}                                          
                     };


    public FilterRaster(String title)
           {
           super(title);
           }

    void init()
           {       
           setLayout(null);
           setSize(250,210);  
           setVisible(true);
           }           
           
    void Filter()
           { 
           //loading the image
           Toolkit tk=Toolkit.getDefaultToolkit();
           IMG=tk.getImage("C:\\JEditor\\x\\raptor.jpg");
       
           MediaTracker mt = new MediaTracker(this);
           mt.addImage(IMG,1);
           try { mt.waitForAll(); 
                } catch (InterruptedException e) 
                             { System.out.println(e.getMessage());};
                             
           //getting the image dimension
           int W=IMG.getWidth(this);
           int H=IMG.getHeight(this);
           BI=new BufferedImage(W,H,BufferedImage.TYPE_INT_RGB);
           }
            
public void paint(Graphics g)
       {     
       Graphics2D g2D = BI.createGraphics();
       g2D.drawImage(IMG,0,0,this);       

       Graphics2D g2=(Graphics2D)g;              
                         
          
      //creating the raster
      Raster R=BI.getData();
               
      WritableRaster Q=null;   
      try{
         //apply the filter to the raster
         BandCombineOp BCOp=new BandCombineOp(BC,null);
         Q=BCOp.createCompatibleDestRaster(R);
         BCOp.filter(R,Q);
      }catch(IllegalArgumentException e)
           {System.out.println(e.getMessage());}       
           
      //convert the raster to a BufferedImage
      BufferedImage BIR=new BufferedImage(BI.getColorModel(),Q,false,null);    
      
       //drawing the raster
       g2.drawImage(BIR,null,30,45);
       }                 
  }

public class RasterBandCombineOp{
       public static void main(String[] args)
              {
              FilterRaster t=new FilterRaster("Raptor");
              t.Filter();
              t.init();
              }
}

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