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HxGauss1dImgGtor.h

/*
 *  Copyright (c) 2000, University of Amsterdam, The Netherlands.
 *  All rights reserved.
 *
 *  Author(s):
 *  Edo Poll (poll@wins.uva.nl)
 */

#ifndef HxGauss1dImgGtor_h
#define HxGauss1dImgGtor_h

#include "HxSubscribedImgGtor.h"
#include "HxPointZ.h"

/*

Generate separated (1d) Gaussian filter.
Taglist parameters are:

double sigma    : standard deviation of the filter
int derivative  : order of the derivative
double accuracy : truncation of the filter at accuracy*sigma; accuracy=3.0
                  implies a 99\% filter mass criterion. Half width of the
                  filter will be accuracy*sigma, unless "size" is specified.
int maxSize     : maximum size the filter is allowed to be
int size        : optional size can be specified. Size can otherwise
                  be determined from paramaters.
*/

class HxGauss1dImgGtor : public HxSubscribedImgGtor 
{
public:
                            HxGauss1dImgGtor();
    virtual                 ~HxGauss1dImgGtor();

    virtual void            init(const HxTagList&);

    virtual HxSizes         domainSize() const;
    virtual HxVec3Double    get(int x, int y, int z);

private:
    double                  _sigma;
    int                     _derivative;
    double                  _accuracy;
    int                     _maxSize;
    int                     _size;

    int                     _filterSize; // actual size of the filter buffer
    double*                 _filter;

    static int              filterWidth(
                                double sigma, int deri,
                                double acc, int maxlen);
    int                     makeFilter(
                                double sigma, int deri, double acc,
                                int fsize,int maxfsize);
};

#endif

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