Image histogram - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Effect

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Description

Image histogram

Demo Code


//package com.java2s;

import java.awt.geom.Point2D;

import java.util.ArrayList;

import java.util.List;

public class Main {
    public static List<Point2D.Float> histogram(int[][] image) {
        int w = image[0].length;
        int h = image.length;
        int dV = 1;
        int L = (256 / dV);
        int[] histogram = new int[L];
        List<Point2D.Float> points = new ArrayList<>();

        for (int i = 0; i < L; i++) {
            histogram[i] = 0;//from   w ww  .j  ava2 s .c o m
        }

        for (int y = 0; y < h; y++) {
            for (int x = 0; x < w; x++) {
                int b = image[y][x];
                int index = b / dV;
                histogram[index]++;
            }
        }

        for (int i = 0; i < histogram.length; i++) {
            points.add(new Point2D.Float(i * dV, histogram[i]));
        }

        return points;
    }
}

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