/*
* Encog(tm) Core v3.0 - Java Version
* http://www.heatonresearch.com/encog/
* http://code.google.com/p/encog-java/
* Copyright 2008-2011 Heaton Research, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.util.downsample;
import java.awt.Image;
import java.awt.image.PixelGrabber;
import org.encog.EncogError;
/**
* Downsample an image using a simple intensity scale. Color information is
* discarded.
*
* @author jheaton
*/
public class SimpleIntensityDownsample extends RGBDownsample {
/**
* Called to downsample the image and store it in the down sample component.
*
* @param image
* The image to downsample.
* @param height
* The height to downsample to.
* @param width
* THe width to downsample to.
* @return The downsampled image.
*/
@Override
public double[] downSample(final Image image, final int height,
final int width) {
processImage(image);
final double[] result = new double[height * width * 3];
final PixelGrabber grabber = new PixelGrabber(image, 0, 0,
getImageWidth(), getImageHeight(), true);
try {
grabber.grabPixels();
} catch (final InterruptedException e) {
throw new EncogError(e);
}
setPixelMap((int[]) grabber.getPixels());
// now downsample
int index = 0;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
downSampleRegion(x, y);
result[index++] = (getCurrentRed() + getCurrentBlue()
+ getCurrentGreen()) / 3;
}
}
return result;
}
}