/*
* Copyright 2013 Alibaba.com All right reserved. This software is the
* confidential and proprietary information of Alibaba.com ("Confidential
* Information"). You shall not disclose such Confidential Information and shall
* use it only in accordance with the terms of the license agreement you entered
* into with Alibaba.com.
*/
package com.alibaba.simpleimage.analyze.sift.scale;
import java.util.ArrayList;
import com.alibaba.simpleimage.analyze.sift.ImagePixelArray;
/**
* 类Pyramid.java的实现描述：TODO 类实现描述
*
* @author axman 2013-6-27 上午11:29:45
*/
public class Pyramid {
public ArrayList<OctaveSpace> octaves; // 该塔中一共有几个8度空间
public int buildOctaves(ImagePixelArray source, float scale, int levelsPerOctave, float octaveSigm, int minSize) {
this.octaves = new ArrayList<OctaveSpace>();
OctaveSpace downSpace = null;
ImagePixelArray prev = source;
while (prev != null && prev.width >= minSize && prev.height >= minSize) {
OctaveSpace osp = new OctaveSpace();
// Create both the gaussian filtered images and the DOG maps
osp.makeGaussianImgs(prev, scale, levelsPerOctave, octaveSigm);
osp.makeGaussianDiffImgs();
octaves.add(osp);
prev = osp.getLastGaussianImg().halved();
if (downSpace != null) downSpace.up = osp;
osp.down = downSpace;
downSpace = osp;
scale *= 2.0;
}
return (octaves.size());
}
}