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import java.applet.Applet;
import java.awt.Graphics;
import uebung.GdiImage;
public class LaplaceApplet extends Applet {
GdiImage image1; //Bild1
GdiImage image2; //Bild2
public void init() {
image1 = new GdiImage("lena.jpg"); //Bild1 laden
//Bildgröße ermitteln
int w = image1.getWidth();
int h = image1.getHeight();
//Bilddaten in 2-dimensionales Array speichern
int[][] pixels1 = image1.getPixels();
//Bild bearbeiten
for (int j = 0; j < h; j++) {
for (int i = 0; i < w; i++) {
int rgb = pixels1[j][i];
int r = (rgb >> 16) & 255;
int g = (rgb >> 8) & 255;
int b = rgb & 255;
int grau = (77 * r + 151 * g + 28 * b) / 256;
rgb = (grau << 16) + (grau << 8) + grau;
pixels1[j][i] = rgb;
}
}
//Bild bearbeiten...
//2-dimensionales Array zurückspeichern
image1.setPixels(pixels1);
image2 = new GdiImage("lena.jpg"); //Bild2 laden
//Laplace Operator auf Bild2 anwenden über Pixel von Bild1
int[][] pixels2 = image1.getPixels();
int[][] pixels2_neu = image1.getPixels();
int maske[][] = { { 0, 1, 0 }, { 1, -4, 1 }, { 0, 1, 0 } }; //Maske
for (int j = 1; j < pixels2.length - 1; j++) {
for (int i = 1; i < pixels2[i].length - 1; i++) {
int sum = 0;
for (int m = 0; m < 3; m++) {
for (int n = 0; n < 3; n++) {
sum += (pixels2[i + m - 1][j + n - 1] & 255)
* maske[m][n];
}
}
pixels2_neu[j][i] = sum; // Speicherung in einem neuen Feld!
}
}
//Unterprogramme
//Maximum und Minimum der Stärke der RGB-Werte berechnen
//hmax = Maximum der RGB-Werte --> Helligkeit
//hmin = Minimum der RGB-Werte --> Dunkelheit
int hmax = 0;
int hmin = 0;
for (int j = 1; j < h - 1; j++) {
for (int i = 1; i < w - 1; i++) {
if (hmax < pixels2_neu[j][i]) {
hmax = pixels2_neu[j][i];
}
if (hmin > pixels2_neu[j][i]) {
hmin = pixels2_neu[j][i];
}
}
}
//RGB-Stärke von jedem Pixel herausfinden
double v = 0;
for (int j = 1; j < h - 1; j++) {
for (int i = 1; i < w - 1; i++) {
v = 255 / (hmax - hmin);
int hpix = (int) (v * (pixels2_neu[j][i] - hmin));
int r = (hpix << 16);
int g = (hpix << 8);
int b = hpix;
hpix = r + g + b;
pixels2_neu[j][i] = hpix;
}
}
image2.setPixels(pixels2_neu);
}
public void paint(Graphics g) {
//Bild zeichnen
int posX1 = 20;
int posY1 = 20;
g.drawImage(image1.getImage(), posX1, posY1, null);
//Bildgröße ermitteln
int w = image1.getWidth();
int h = image1.getHeight();
int posX2 = 40 + w;
int posY2 = 20;
g.drawImage(image2.getImage(), posX2, posY2, null);
//setSize(1100, 500);
setSize(((2 * w) + (3 * 20)), (h + (2 * 20)));
}
}
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