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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>

 /* norm2 already taken in HxImageRep::getRgbPixels2d */

template<class ValT, class ValDoubleT>
class HxRgbLogMag
{
public:
                        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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