/*
* Geotoolkit.org - An Open Source Java GIS Toolkit
* http://www.geotoolkit.org
*
* (C) 2012, Geomatys
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*/
package org.geotoolkit.image.interpolation;
import java.awt.Point;
import java.awt.image.DataBuffer;
import java.awt.image.WritableRaster;
import javax.media.jai.RasterFactory;
import org.geotoolkit.image.iterator.PixelIteratorFactory;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
/**
* Test Lanczos class.
*
* Todo : find how compute max and min values from interpolate boundary.
*
* @author Rémi Marechal (Geomatys).
*/
public class LanczosTest extends InterpolationTest {
private int miny, minx, width, height;
private WritableRaster rastertest;
public LanczosTest() {
miny = -1;
minx = -2;
width = 4;
height = 4;
double val = -55;
rastertest = RasterFactory.createBandedRaster(DataBuffer.TYPE_DOUBLE, width, height, 1, new Point(minx, miny));
for (int y = miny; y < miny + height; y++) {
for (int x = minx; x < minx + width; x++) {
rastertest.setSample(x, y, 0, val++);
}
}
pixIterator = PixelIteratorFactory.createDefaultIterator(rastertest);
interpol = new LanczosInterpolation(pixIterator, 2);
}
/**
* <p>Test interpolate method from biCubic class.<br/><br/>
*
* Verify that interpolation at Integer pixel position equal pixel position.<br/>
* Verify that none-integer pixels position interpolation is between minimum and maximum interpolation values.<br/><br/>
*
* To find minimum and maximum values :<br/>
* - Compute pixels interpolation at nearest integer pixel position and get maximum and minimum values.<br/>
* - Find interpolation roots, get roots interpolation values if its possible,<br/>
* and get maximum and minimum values from previous maximum and minimum.</p>
*/
@Test
public void globalTest() {
// pixIterator.moveTo(0, -1, 0);
double interpolXDeb, interpolXEnd, interpolYDeb, interpolYEnd;
for (int y = miny; y < miny + height-1; y++) {
for (int x = minx; x < minx + width-1; x++) {
// interpolation verification at integer pixel position.
interpolXDeb = interpol.interpolate(x, y, 0);
assertTrue(Math.abs(rastertest.getSampleDouble(x, y, 0) - interpolXDeb) <= 1E-12);
interpolXEnd = interpol.interpolate(x+1, y, 0);
assertTrue(Math.abs(rastertest.getSampleDouble(x+1, y, 0) - interpolXEnd) <= 1E-12);
interpolYDeb = interpol.interpolate(x, y+1, 0);
assertTrue(Math.abs(rastertest.getSampleDouble(x, y+1, 0) - interpolYDeb) <= 1E-12);
interpolYEnd = interpol.interpolate(x+1, y+1, 0);
assertTrue(Math.abs(rastertest.getSampleDouble(x+1, y+1, 0) - interpolYEnd) <= 1E-12);
}
}
}
}