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BoofCV is an open source Java library for real-time computer vision and robotics applications.
/*
* Copyright (c) 2011-2013, Peter Abeles. All Rights Reserved.
*
* This file is part of BoofCV (http://boofcv.org).
*
* 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.
*/
package boofcv.alg.transform.pyramid;
import boofcv.alg.filter.misc.AverageDownSampleOps;
import boofcv.struct.image.ImageSingleBand;
import boofcv.struct.pyramid.PyramidDiscrete;
/**
* Creates an image pyramid by down sampling square regions using {@link AverageDownSampleOps}.
*
* @author Peter Abeles
*/
@SuppressWarnings({"unchecked"})
public class PyramidDiscreteAverage extends PyramidDiscrete {
/**
*
* @param imageType Type of image processed
* @param saveOriginalReference If a reference to the full resolution image should be saved instead of copied.
* Set to false if you don't know what you are doing.
* @param scaleFactors Scale factor for each layer in the pyramid relative to the input layer
*/
public PyramidDiscreteAverage(Class imageType,
boolean saveOriginalReference, int... scaleFactors)
{
super(imageType,saveOriginalReference,scaleFactors);
}
@Override
public void process(T input) {
super.initialize(input.width,input.height);
if (scale[0] == 1) {
if (isSaveOriginalReference()) {
setFirstLayer(input);
} else {
getLayer(0).setTo(input);
}
} else {
AverageDownSampleOps.down(input, scale[0], getLayer(0));
}
for (int index = 1; index < getNumLayers(); index++) {
int width = scale[index]/scale[index-1];
AverageDownSampleOps.down(getLayer(index-1),width,getLayer(index));
}
}
/**
* The center of the sampling kernel is 1/2 the square region's width
*
* @param layer Layer in the pyramid
* @return offset
*/
@Override
public double getSampleOffset(int layer) {
return (scale[layer]-1)/2.0;
}
@Override
public double getSigma(int layer) {
return 0;
}
}
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