import ij.ImagePlus;
import ij.plugin.filter.PlugInFilter;
import ij.process.ImageProcessor;


public class Binomialfilter_4hp implements PlugInFilter {
	ImagePlus imp;


	public void run(ImageProcessor ip) {
		int w = ip.getWidth();
		int h = ip.getHeight();
		double [][] binomial = {{-1/256.0, -4/256.0, -6/256.0, -4/256.0, -1/256.0},
	             {-4/256.0, -16/256.0, -24/256.0, -16/256.0, -4/256.0},
	             {-6/256.0, -24/256.0, 220/256.0, -24/256.0, -6/256.0},
	             {-4/256.0, -16/256.0, -24/256.0, -16/256.0, -4/256.0},
	             {-1/256.0, -4/256.0, -6/256.0, -4/256.0, -1/256.0}
		};
		ImageProcessor copy = ip.duplicate();

		for(int u = 2; u< w-3; u++)
		{
			for (int v = 2; v < h-3; v++)
			{
				double sum = 0;
				for(int j=-2; j<=2; j++){
					for(int i = -2; i<=2; i++){
						int p = copy.getPixel(u+i, v+j);
						double c = binomial[j+2][i+2];
						sum = sum + c * p;
					}
				}
				int q = (int) sum;
				ip.putPixel(u, v, q);
			}
		}
	}

	public int setup(String arg0, ImagePlus imp) {

		return DOES_8G;
	}

}