import ij.*;
import ij.process.*;
import ij.gui.*;
import java.awt.*;
import ij.plugin.filter.*;

public class Laplace_2018_11_07 implements PlugInFilter {
  ImagePlus imp;

  public int setup(String arg, ImagePlus imp) {
    this.imp = imp;
    return DOES_ALL;
  }

  public void run(ImageProcessor ip) {
    int width = ip.getWidth();
    int height = ip.getHeight();
    
    ImageProcessor copy = ip.duplicate();
    
    int[][] L ={{1,1,1},{1,-8,1},{1,1,1}};
    
    for(int m = 1; m < width - 1; m++) {
      for(int n = 1; n < height - 1; n++) {
        int p = 0;
        for(int i = -1; i <= 1; i++) {
          for(int j = -1; j <= 1; j++) {  
            int I = copy.getPixel(m-i,n-j);
            p += I * L[i+1][j+1];
          }
        }
        p = p*10 + 128; // Irgendein Faktor
        ip.putPixel(m,n,p);      
      }  
    }
  }

}