/*#******************************************************************************
** IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
**
** By downloading, copying, installing or using the software you agree to this license.
** If you do not agree to this license, do not download, install,
** copy or use the software.
**
**
** bioinspired : interfaces allowing OpenCV users to integrate Human Vision System models. Presented models originate from Jeanny Herault's original research and have been reused and adapted by the author&collaborators for computed vision applications since his thesis with Alice Caplier at Gipsa-Lab.
** Use: extract still images & image sequences features, from contours details to motion spatio-temporal features, etc. for high level visual scene analysis. Also contribute to image enhancement/compression such as tone mapping.
**
** Maintainers : Listic lab (code author current affiliation & applications) and Gipsa Lab (original research origins & applications)
**
**  Creation - enhancement process 2007-2011
**      Author: Alexandre Benoit (benoit.alexandre.vision@gmail.com), LISTIC lab, Annecy le vieux, France
**
** Theses algorithm have been developped by Alexandre BENOIT since his thesis with Alice Caplier at Gipsa-Lab (www.gipsa-lab.inpg.fr) and the research he pursues at LISTIC Lab (www.listic.univ-savoie.fr).
** Refer to the following research paper for more information:
** Benoit A., Caplier A., Durette B., Herault, J., "USING HUMAN VISUAL SYSTEM MODELING FOR BIO-INSPIRED LOW LEVEL IMAGE PROCESSING", Elsevier, Computer Vision and Image Understanding 114 (2010), pp. 758-773, DOI: http://dx.doi.org/10.1016/j.cviu.2010.01.011
** This work have been carried out thanks to Jeanny Herault who's research and great discussions are the basis of all this work, please take a look at his book:
** Vision: Images, Signals and Neural Networks: Models of Neural Processing in Visual Perception (Progress in Neural Processing),By: Jeanny Herault, ISBN: 9814273686. WAPI (Tower ID): 113266891.
**
** The retina filter includes the research contributions of phd/research collegues from which code has been redrawn by the author :
** _take a look at the retinacolor.hpp module to discover Brice Chaix de Lavarene color mosaicing/demosaicing and the reference paper:
** ====> B. Chaix de Lavarene, D. Alleysson, B. Durette, J. Herault (2007). "Efficient demosaicing through recursive filtering", IEEE International Conference on Image Processing ICIP 2007
** _take a look at imagelogpolprojection.hpp to discover retina spatial log sampling which originates from Barthelemy Durette phd with Jeanny Herault. A Retina / V1 cortex projection is also proposed and originates from Jeanny's discussions.
** ====> more informations in the above cited Jeanny Heraults's book.
**
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**               For Open Source Computer Vision Library
**
** Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
** Copyright (C) 2008-2011, Willow Garage Inc., all rights reserved.
**
**               For Human Visual System tools (bioinspired)
** Copyright (C) 2007-2011, LISTIC Lab, Annecy le Vieux and GIPSA Lab, Grenoble, France, all rights reserved.
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#include "precomp.hpp"

#include "parvoretinafilter.hpp"

// @author Alexandre BENOIT, benoit.alexandre.vision@gmail.com, LISTIC : www.listic.univ-savoie.fr, Gipsa-Lab, France: www.gipsa-lab.inpg.fr/

#include <iostream>
#include <cmath>

namespace cv
{
namespace bioinspired
{
//////////////////////////////////////////////////////////
//                 OPL RETINA FILTER
//////////////////////////////////////////////////////////

// Constructor and Desctructor of the OPL retina filter

ParvoRetinaFilter::ParvoRetinaFilter(const unsigned int NBrows, const unsigned int NBcolumns)
:BasicRetinaFilter(NBrows, NBcolumns, 3),
 _photoreceptorsOutput(NBrows*NBcolumns),
 _horizontalCellsOutput(NBrows*NBcolumns),
 _parvocellularOutputON(NBrows*NBcolumns),
 _parvocellularOutputOFF(NBrows*NBcolumns),
 _bipolarCellsOutputON(NBrows*NBcolumns),
 _bipolarCellsOutputOFF(NBrows*NBcolumns),
 _localAdaptationOFF(NBrows*NBcolumns)
{
    // link to the required local parent adaptation buffers
    _localAdaptationON=&_localBuffer;
    _parvocellularOutputONminusOFF=&_filterOutput;
    // (*_localAdaptationON)=&_localBuffer;
    // (*_parvocellularOutputONminusOFF)=&(BasicRetinaFilter::TemplateBuffer);

    // init: set all the values to 0
    clearAllBuffers();


#ifdef OPL_RETINA_ELEMENT_DEBUG
    std::cout<<"ParvoRetinaFilter::Init OPL retina filter at specified frame size OK\n"<<std::endl;
#endif

}

ParvoRetinaFilter::~ParvoRetinaFilter()
{

#ifdef OPL_RETINA_ELEMENT_DEBUG
    std::cout<<"ParvoRetinaFilter::Delete OPL retina filter OK"<<std::endl;
#endif
}

////////////////////////////////////
// functions of the PARVO filter
////////////////////////////////////

// function that clears all buffers of the object
void ParvoRetinaFilter::clearAllBuffers()
{
    BasicRetinaFilter::clearAllBuffers();
    _photoreceptorsOutput=0;
    _horizontalCellsOutput=0;
    _parvocellularOutputON=0;
    _parvocellularOutputOFF=0;
    _bipolarCellsOutputON=0;
    _bipolarCellsOutputOFF=0;
    _localAdaptationOFF=0;
}

/**
* resize parvo retina filter object (resize all allocated buffers
* @param NBrows: the new height size
* @param NBcolumns: the new width size
*/
void ParvoRetinaFilter::resize(const unsigned int NBrows, const unsigned int NBcolumns)
{
    BasicRetinaFilter::resize(NBrows, NBcolumns);
    _photoreceptorsOutput.resize(NBrows*NBcolumns);
    _horizontalCellsOutput.resize(NBrows*NBcolumns);
    _parvocellularOutputON.resize(NBrows*NBcolumns);
    _parvocellularOutputOFF.resize(NBrows*NBcolumns);
    _bipolarCellsOutputON.resize(NBrows*NBcolumns);
    _bipolarCellsOutputOFF.resize(NBrows*NBcolumns);
    _localAdaptationOFF.resize(NBrows*NBcolumns);

    // link to the required local parent adaptation buffers
    _localAdaptationON=&_localBuffer;
    _parvocellularOutputONminusOFF=&_filterOutput;

    // clean buffers
    clearAllBuffers();
}

// change the parameters of the filter
void ParvoRetinaFilter::setOPLandParvoFiltersParameters(const float beta1, const float tau1, const float k1, const float beta2, const float tau2, const float k2)
{
    // init photoreceptors low pass filter
    setLPfilterParameters(beta1, tau1, k1);
    // init horizontal cells low pass filter
    setLPfilterParameters(beta2, tau2, k2, 1);
    // init parasol ganglion cells low pass filter (default parameters)
    setLPfilterParameters(0, tau1, k1, 2);

}

// update/set size of the frames

// run filter for a new frame input
// output return is (*_parvocellularOutputONminusOFF)
const std::valarray<float> &ParvoRetinaFilter::runFilter(const std::valarray<float> &inputFrame, const bool useParvoOutput)
{
    _spatiotemporalLPfilter(get_data(inputFrame), &_photoreceptorsOutput[0]);
    _spatiotemporalLPfilter(&_photoreceptorsOutput[0], &_horizontalCellsOutput[0], 1);
    _OPL_OnOffWaysComputing();

    if (useParvoOutput)
    {
        // local adaptation processes on ON and OFF ways
        _spatiotemporalLPfilter(&_bipolarCellsOutputON[0], &(*_localAdaptationON)[0], 2);
        _localLuminanceAdaptation(&_parvocellularOutputON[0], &(*_localAdaptationON)[0]);

        _spatiotemporalLPfilter(&_bipolarCellsOutputOFF[0], &_localAdaptationOFF[0], 2);
        _localLuminanceAdaptation(&_parvocellularOutputOFF[0], &_localAdaptationOFF[0]);

        //// Final loop that computes the main output of this filter
        //
        //// loop that makes the difference between photoreceptor cells output and horizontal cells
        //// positive part goes on the ON way, negative pat goes on the OFF way
        register float *parvocellularOutputONminusOFF_PTR=&(*_parvocellularOutputONminusOFF)[0];
        register float *parvocellularOutputON_PTR=&_parvocellularOutputON[0];
        register float *parvocellularOutputOFF_PTR=&_parvocellularOutputOFF[0];

        for (register unsigned int IDpixel=0 ; IDpixel<_filterOutput.getNBpixels() ; ++IDpixel)
            *(parvocellularOutputONminusOFF_PTR++)= (*(parvocellularOutputON_PTR++)-*(parvocellularOutputOFF_PTR++));
    }
    return (*_parvocellularOutputONminusOFF);
}

void ParvoRetinaFilter::_OPL_OnOffWaysComputing() // WARNING : this method requires many buffer accesses, parallelizing can increase bandwith & core efficacy
{
    // loop that makes the difference between photoreceptor cells output and horizontal cells
    // positive part goes on the ON way, negative pat goes on the OFF way

#ifdef MAKE_PARALLEL
        cv::parallel_for_(cv::Range(0,_filterOutput.getNBpixels()), Parallel_OPL_OnOffWaysComputing(&_photoreceptorsOutput[0], &_horizontalCellsOutput[0], &_bipolarCellsOutputON[0], &_bipolarCellsOutputOFF[0], &_parvocellularOutputON[0], &_parvocellularOutputOFF[0]));
#else
    float *photoreceptorsOutput_PTR= &_photoreceptorsOutput[0];
    float *horizontalCellsOutput_PTR= &_horizontalCellsOutput[0];
    float *bipolarCellsON_PTR = &_bipolarCellsOutputON[0];
    float *bipolarCellsOFF_PTR = &_bipolarCellsOutputOFF[0];
    float *parvocellularOutputON_PTR= &_parvocellularOutputON[0];
    float *parvocellularOutputOFF_PTR= &_parvocellularOutputOFF[0];
    // compute bipolar cells response equal to photoreceptors minus horizontal cells response
    // and copy the result on parvo cellular outputs... keeping time before their local contrast adaptation for final result
    for (register unsigned int IDpixel=0 ; IDpixel<_filterOutput.getNBpixels() ; ++IDpixel)
    {
        float pixelDifference = *(photoreceptorsOutput_PTR++) -*(horizontalCellsOutput_PTR++);
        // test condition to allow write pixelDifference in ON or OFF buffer and 0 in the over
        float isPositive=(float) (pixelDifference>0.0f);

        // ON and OFF channels writing step
        *(parvocellularOutputON_PTR++)=*(bipolarCellsON_PTR++) = isPositive*pixelDifference;
        *(parvocellularOutputOFF_PTR++)=*(bipolarCellsOFF_PTR++)= (isPositive-1.0f)*pixelDifference;
    }
#endif
}
}// end of namespace bioinspired
}// end of namespace cv
