[Bluej-discuss] Chapter 11 - Imageviewer Smooth Filter

[Mark Wallsgrove]

Afternoon everyone,

I am just reading through chapter 11 on page 343 and I have become stuck on
a task. The idea is to create a smooth filter for an image. My filter
doesn't smooth lol.. I have programmed what they asked for, get the average
of 9 pixels and set the middle pixel to that average. This creates a very
distasteful image.

Here is my code for the filter:

[CODE]
import java.awt.Color;
import java.util.ArrayList;
/**
 * Write a description of class SmoothFilter here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class SmoothFilter extends Filter
{
    /**
     * Constructor for objects of class SmoothFilter
     */
    public SmoothFilter(String name)
    {
        super(name);
    }

    /**
     * Apply this filter to an image
     * @param image The image to apply the filter to
     */
    public OFImage apply(OFImage image){
        //Create new image
        OFImage newImage = new OFImage(image);
        //Get height and width
        int w = image.getWidth();
        int h = image.getHeight();
        //Loops
        for(int y = 0; y < h; y++){
            for(int x = 0; x < w; x++){
                newImage.setPixel(x, y, getNewPixel(image, x, y));

            }
        }
        return newImage;
    }
    /**
     * return the modified pixel
     * @param image Image to take a sample from
     * @return the new pixel
     */
    private Color getNewPixel(OFImage image, int x, int y){
        //Create new list
        int averagePix = 0;
        int counter = 0;
        for(int cy = 0; cy < 3; cy++){
            for(int cx = 0; cx < 3; cx++){
                if(((x-1)+cx > -1) && ((x-1)+cx < image.getWidth())){
                    if(((y-1)+cy > -1) && ((y-1)+cy < image.getHeight())){
                        averagePix +=
image.getPixel(x-1+cx,y-1+cy).getRGB(); 
                        counter++;
                        //System.out.println("Coords: "+  (y-1+cy) +" :: y=
"+ y +" cy= "+ cy +" \n "+ (x-1+cx));
                        //System.exit(0);
                    }
                }
            }
        }
        return (new Color(averagePix / counter));
    }
}
[/CODE]


Could anyone else give me a clue for what I am meant to be programming..
ie.. whats the sudo code. I think I might have got the wrong idea. The txt
for that question isn't worded correctly I don't think.

Thanks for any help given..
All the best
Mark