Java Array Normalize normalise(double[] A)

Description

Scale array values into a 8bit (between 0 and 255).

License

Open Source License

Parameter

Parameter	Description
A	the a

Declaration

public static void normalise(double[] A) 

Method Source Code

//package com.java2s;
/*//from w  w  w  .  j  a v a 2  s . c  o  m
 * This file is part of TiPi (a Toolkit for Inverse Problems and Imaging)
 * developed by the MitiV project.
 *
 * Copyright (c) 2014 the MiTiV project, http://mitiv.univ-lyon1.fr/
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

public class Main {
    /**
     * Scale array values into a 8bit (between 0 and 255).
     *
     * @param A the a
     */
    public static void normalise(double[] A) {
        int L = A.length;
        double N = sum(abs2(A, 0));
        for (int i = 0; i < L; i++) {
            A[i] = A[i] / N;
        }
    }

    /**
     * Sum of the values in the array
     */
    public static double sum(double a[]) {
        int size = a.length;
        double sum = 0;
        for (int i = 0; i < size; i++) {
            sum += a[i];
        }
        return sum;
    }

    /**
     * Sum of the values in the array
     */
    public static double sum(double a[], int begin, int end) {
        double sum = 0;
        for (int i = begin; i <= end; i++) {
            sum += a[i];
        }
        return sum;
    }

    /**
     * Sum of the values in the array
     */
    public static long sum(long array[]) {
        int size = array.length;
        long sum = 0;
        for (int i = 0; i < size; i++) {
            sum += array[i];
        }
        return sum;
    }

    /**
     * Sum of the values in the array
     */
    public static double sum(double array[][]) {
        int H = array.length;
        double sum = 0;
        for (int i = 0; i < H; i++) {
            sum += sum(array[i]);
        }
        return sum;
    }

    /**
     * Sum of the values in the array
     */
    public static double sum(double array[][][]) {
        int D = array.length;
        double sum = 0;
        for (int k = 0; k < D; k++) {
            sum += sum(array[k]);
        }
        return sum;
    }

    /**
     * Returns the squared absolute value of a 2d array (complex).
     *
     * @param IN array
     * @return square absolute value.
     */
    public static double[][] abs2(double[][] IN) {
        int H = IN.length;
        int W = IN[0].length / 2;
        double[][] OUT = new double[H][W];
        for (int i = 0; i < H; i++) {
            OUT[i] = abs2(IN[i], 1);
        }
        return OUT;
    }

    /**
     * Returns the squared absolute value of 1d array.
     *
     * @param IN array
     * @return square absolute value.
     */
    public static double[] abs2(double[] x, int isComplex) {
        if (isComplex == 1) {
            int L = x.length / 2;
            double[] y = new double[L];
            for (int i = 0; i < L; i++) {
                y[i] = x[2 * i] * x[2 * i] + x[2 * i + 1] * x[2 * i + 1];
            }
            return y;
        } else {
            int L = x.length;
            double[] y = new double[L];
            for (int i = 0; i < L; i++) {
                y[i] = x[i] * x[i];
            }
            return y;
        }
    }

    /**
     * Returns the squared absolute value of 1d array.
     *
     * @param IN array
     * @return square absolute value.
     */
    public static double[] abs2(double[] x, int begin, int end, int isComplex) {
        //TODO regarder taille
        if (isComplex == 1) {
            int L = x.length / 2;
            double[] y = new double[L];
            for (int i = begin; i < end; i++) {
                y[i] = x[2 * i] * x[2 * i] + x[2 * i + 1] * x[2 * i + 1];
            }
            return y;
        } else {
            int L = end - begin + 1;
            double[] y = new double[L];
            for (int i = 0; i < L; i++) {
                y[i] = x[i + begin] * x[i + begin];
            }
            return y;
        }
    }
}

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