Exercício 6 - Histograma

exercicio.java

package aulacompgrafica;

import ij.ImagePlus;
import ij.io.Opener;
import ij.process.ByteProcessor;
import ij.process.ColorProcessor;
import ij.process.ImageProcessor;
import java.awt.Color;

public class AulaCompGrafica {
    public static void main(String[] args) {
        new AulaCompGrafica().histogram();
    }
    
    public void histogram() {
        int histogram[] = new int[256];
        ImagePlus imp = new Opener().openImage("lena.bmp");
        ImageProcessor ip = imp.getProcessor();
        int width = imp.getWidth();
        int height = imp.getHeight();
        System.out.println(width);
        
        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                histogram[imp.getPixel(i, j)[0]]++;
            }
        }
        
        ImageProcessor ip2 = new ColorProcessor(256, 100);
        ip2.setColor(Color.GRAY);
        ip2.fill();
        
        int max = 0;
        
        for (int i = 0; i < 256; i++)
            if (histogram[i] > max)
                max = histogram[i];
        
        int factor, result;
        
        for (int i = 0; i < 256; i++) {
            if (histogram[i] == 0) {
                result = 0;
            } else {
                factor = ((100 * histogram[i]) / max);
                result = (100 * factor) / 100;
            }
            for (int j = 0; j < result; j++) {
//                System.out.println("plotando (" + i + ", " + j + ")");
                ip2.putPixel(i, 100 - j, Color.BLACK.getRGB());
            }
            
//            if (histogram[i] != 0) {
//                System.out.println("plotando: (" + i + ") " + result);
//            }
        }
        
        ImagePlus imp2 = new ImagePlus("Histogram", ip2);
        imp2.show();
    }
}