97 lines
2.9 KiB
Java
97 lines
2.9 KiB
Java
package io.gitlab.jfronny.ImgJava.imageProcessing;
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import io.gitlab.jfronny.ImgJava.util.MColor;
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import io.gitlab.jfronny.ImgJava.util.Picture;
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import java.awt.*;
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/**
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* Algorithmen zur Änderung der Pixelpositionen eines Pictures
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* z.B. drehen, spiegeln usw.
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*
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* @author Thomas Schaller
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* @version 1.1 (28.11.2019)
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*/
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public class UtilMatrix {
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public static Picture blurBox(Picture picture, int amount) {
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return applyMatrix(picture, new double[][]{
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new double[] {1, 1, 1},
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new double[] {1, 1, 1},
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new double[] {1, 1, 1}
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}, amount);
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}
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public static Picture blurGauss(Picture picture, int radius, int amount) {
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double sigma = radius / 2d;
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int bl = radius * 2 + 1;
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double[][] matrix = new double[bl][bl];
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for (int x = 0; x < bl; x++) {
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for (int y = 0; y < bl; y++) {
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matrix[x][y] = gauss(x - radius, y - radius, sigma);
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}
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}
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return applyMatrix(picture, matrix, amount);
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}
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private static double gauss(double dX, double dY, double stDev) {
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return Math.exp(-((dX * dX + dY * dY) / (2 * stDev * stDev))) / (2 * Math.PI * stDev * stDev);
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}
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public static Picture sharpen(Picture picture, int amount) {
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return applyMatrix(picture, new double[][]{
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new double[] {0, -1, 0},
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new double[] {-1, 5, -1},
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new double[] {0, -1, 0}
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}, amount);
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}
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public static Picture applyMatrix(Picture picture, double[][] matrix, int amount) {
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int w = picture.getWidth();
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int h = picture.getHeight();
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int mW = matrix.length;
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int mH = matrix[0].length;
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if ((mW % 2 != 1) || (mH % 2 != 1))
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throw new IndexOutOfBoundsException("matrix must not have round length");
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mW /= 2;
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mH /= 2;
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Color[][] pixel;
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Color[][] pixelNeu = picture.getPixelArray();
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for (int i = 0; i < amount; i++) {
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pixel = pixelNeu;
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pixelNeu = new Color[w][h];
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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pixelNeu[x][y] = pixel[x][y];
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MColor sum = new MColor();
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double gSum = 0;
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for (int dx = -mW; dx <= mW; dx++) {
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for (int dy = -mH; dy <= mH; dy++) {
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if (x + dx >= 0 && y + dy >= 0 && x + dx < w && y + dy < h) {
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double g = matrix[mW + dx][mH + dy];
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gSum += g;
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sum.addM(pixel[x + dx][y + dy], g);
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}
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}
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}
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pixelNeu[x][y] = sum.div(gSum).get();
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}
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}
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}
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picture.setPixelArray(pixelNeu);
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return picture;
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}
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}
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