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Instantiation of an in/out operation : Image to histogram

The file HxDetector/Global/HxImageToHistogram.c provides a complete overview of all that is needed to make a hisogram of an image:

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

#include "HxImageToHistogram.h"
#include "HxImgFtorInOut.h"
#include "HxIncludedSigs.h"

template<class ValT>
class HxInOutHistogram
{
public:
    typedef HxTagPixOpOut       DirectionCategory;
    typedef HxTagTransInVar     TransVarianceCategory;
    typedef HxTag1Phase         PhaseCategory;

                        HxInOutHistogram(HxTagList&);

    void                doIt(const ValT& pixV);

    static HxString     className();

private:
    HxHistogram*        _hist;
    int                 _getDim;
};

template<class ValT>
HxInOutHistogram<ValT>::HxInOutHistogram(HxTagList& tags)
{
    _hist = HxGetTag(tags, "histogram", (HxHistogram*)0);
    _getDim = HxGetTag<int>(tags, "getDim");
}

template<class ValT>
inline void
HxInOutHistogram<ValT>::doIt(const ValT& pixV)
{
    if (_getDim <= 0)
        _hist->insertVal(pixV);
    else
        _hist->insertVal(((ValT) pixV).getValue(_getDim));
}

template<class ValT>
HxString
HxInOutHistogram<ValT>::className()
{
    return HxString("histogram");
}

template<class ImgSigT>
struct HxInstantiatorHistogram
{
    HxImgFtorInOut<ImgSigT, HxInOutHistogram<typename ImgSigT::ArithType> > f;
};

HxAlwaysInstantiateHistogram::HxAlwaysInstantiateHistogram()
{
}

namespace HxImageToHistogram_c {
static HxInstantiatorHistogram<HxImageSig2dByte>           f001;
static HxInstantiatorHistogram<HxImageSig2dShort>          f002;
static HxInstantiatorHistogram<HxImageSig2dInt>            f003;
static HxInstantiatorHistogram<HxImageSig2dFloat>          f004;
static HxInstantiatorHistogram<HxImageSig2dDouble>         f005;
static HxInstantiatorHistogram<HxImageSig2dVec2Byte>       f006;
static HxInstantiatorHistogram<HxImageSig2dVec2Short>      f007;
static HxInstantiatorHistogram<HxImageSig2dVec2Int>        f008;
static HxInstantiatorHistogram<HxImageSig2dVec2Float>      f009;
static HxInstantiatorHistogram<HxImageSig2dVec2Double>     f010;
static HxInstantiatorHistogram<HxImageSig2dVec3Byte>       f011;
static HxInstantiatorHistogram<HxImageSig2dVec3Short>      f012;
static HxInstantiatorHistogram<HxImageSig2dVec3Int>        f013;
static HxInstantiatorHistogram<HxImageSig2dVec3Float>      f014;
static HxInstantiatorHistogram<HxImageSig2dVec3Double>     f015;
static HxInstantiatorHistogram<HxImageSig3dByte>           f016;
static HxInstantiatorHistogram<HxImageSig3dShort>          f017;
static HxInstantiatorHistogram<HxImageSig3dInt>            f018;
static HxInstantiatorHistogram<HxImageSig3dFloat>          f019;
static HxInstantiatorHistogram<HxImageSig3dDouble>         f020;
};


HxHistogram
HxImageToHistogram(HxImageRep im, int getDim, double lowBin,
    double highBin, int nBin)
{
    int nDim = (getDim <= 0) ? im.pixelDimensionality() : 1;
    HxHistogram hist = HxHistogram(REAL_VALUE, nDim, lowBin, highBin, nBin,
                                                     lowBin, highBin, nBin,
                                                     lowBin, highBin, nBin);

    HxTagList tags;
    HxAddTag(tags, "histogram", &hist);
    HxAddTag(tags, "getDim", getDim);

    im.exportOp("histogram", tags);

    return hist;
}

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