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HxRgbLogMag.h

/*
 *  Copyright (c) 2001, University of Amsterdam, The Netherlands.
 *  All rights reserved.
 *
 *  Author(s):
 *  Jan-Mark Geusebroek (mark@science.uva.nl)
 *
 */

#ifndef HxRgbLogMag_h
#define HxRgbLogMag_h

#include "HxTagList.h"
#include "HxClassName.h"
#include "HxColConvert.h"

#include <cmath>

template<class ValT, class ValDoubleT>
class HxRgbLogMag
{
public:
    typedef ValDoubleT ArithTypeDouble;

                        HxRgbLogMag(HxTagList& tags)
                            {
                                _lowVal = HxGetTag(tags, "lowVal", double(0));
                                _highVal = HxGetTag(tags, "highVal", double(255));
                                _lowVal -= 1.0;
                                _factor = 255.0/::log(_highVal-_lowVal);
                            }

    int                 doIt(const ValT& pixV)
                            {
                                double v = ::log(pixV.x()-_lowVal);
                                int x = (int) (v*_factor);
                                return (255 << 24) | (x << 16) | (x << 8) | x;
                            }

    int                 doItDouble(const ValDoubleT& pixV)
                            {
                                double v = ::log(pixV.x()-_lowVal);
                                int x = (int) (v*_factor);
                                return (255 << 24) | (x << 16) | (x << 8) | x;
                            }

    static HxString     className()
                            { return HxString("LogMagnitude"); }

private:
    double              _lowVal;
    double              _highVal;
    double              _factor;
};


#endif

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