Java interpolate interpolate2D(final float wi, final float wj, final float x00, final float x10, final float x01, final float x11)

Description

Performs a fast linear interpolation in two dimensions i and j.

License

Open Source License

Parameter

Parameter	Description
wi	weight in i-direction, a weight of 0.0 corresponds to i, 1.0 to i+1
wj	weight in j-direction, a weight of 0.0 corresponds to j, 1.0 to j+1
x00	first anchor point located at (i,j)
x10	second anchor point located at (i+1,j)
x01	third anchor point located at (i,j+1)
x11	forth anchor point located at (i+1,j+1)

Return

the interpolated value

Declaration

public static float interpolate2D(final float wi, final float wj, final float x00, final float x10,
        final float x01, final float x11) 

Method Source Code

//package com.java2s;
/*//from  w  w  w . j  av  a  2 s. c  o  m
 * Copyright (C) 2010 Brockmann Consult GmbH (info@brockmann-consult.de)
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or (at your option)
 * any later version.
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see http://www.gnu.org/licenses/
 */

public class Main {
    /**
     * Performs a fast linear interpolation in two dimensions i and j.
     *
     * @param wi  weight in i-direction, a weight of 0.0 corresponds to i, 1.0 to i+1
     * @param wj  weight in j-direction, a weight of 0.0 corresponds to j, 1.0 to j+1
     * @param x00 first anchor point located at (i,j)
     * @param x10 second anchor point located at (i+1,j)
     * @param x01 third anchor point located at (i,j+1)
     * @param x11 forth anchor point located at (i+1,j+1)
     *
     * @return the interpolated value
     */
    public static float interpolate2D(final float wi, final float wj, final float x00, final float x10,
            final float x01, final float x11) {
        return x00 + wi * (x10 - x00) + wj * (x01 - x00) + wi * wj * (x11 + x00 - x01 - x10);
    }

    /**
     * Performs a fast linear interpolation in two dimensions i and j.
     *
     * @param wi  weight in i-direction, a weight of 0.0 corresponds to i, 1.0 to i+1
     * @param wj  weight in j-direction, a weight of 0.0 corresponds to j, 1.0 to j+1
     * @param x00 first anchor point located at (i,j)
     * @param x10 second anchor point located at (i+1,j)
     * @param x01 third anchor point located at (i,j+1)
     * @param x11 forth anchor point located at (i+1,j+1)
     *
     * @return the interpolated value
     */
    public static double interpolate2D(final double wi, final double wj, final double x00, final double x10,
            final double x01, final double x11) {
        return x00 + wi * (x10 - x00) + wj * (x01 - x00) + wi * wj * (x11 + x00 - x01 - x10);
    }
}

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8. interpolateBrightness(int a, int b, int c, int d)
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