GaussianWindow.h

/*
 
MIT License
 
Copyright (c) 2017 FMI Open Development / Markus Peura, first.last@fmi.fi
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
/*
Part of Rack development has been done in the BALTRAD projects part-financed
by the European Union (European Regional Development Fund and European
Neighbourhood Partnership Instrument, Baltic Sea Region Programme 2007-2013)
*/
#ifndef GaussianWindow_H_
#define GaussianWindow_H_
 
#include "Window.h"
//#include "WindowOp.h"
//#include "SlidingWindow.h"
 
namespace drain
{
 
namespace image
{
 
class GaussianWindowConf : public WindowConfig {
 
public:
 
    double radius;
 
};
 
 
template <bool DIR=true, class R=WindowCore>
class GaussianStripe : public Window<GaussianWindowConf,R> { // consider scaleWeight
 
public:
 
    typedef float value_t;
 
    GaussianStripe(int n, double radius = 1.0) : Window<GaussianWindowConf,R>(DIR?n:1, DIR?1:n), weightSum(0), value(0), scaleResult(1.0) {
        this->conf.radius = radius;
        w = 0.0;
        sumW = 0.0;
    };
 
    virtual
    ~GaussianStripe(){};
 
    virtual inline
    void setImageLimits() const {
        this->coordinateHandler.set(this->src.getConf());
        //this->src.adjustCoordinateHandler(this->coordinateHandler);
    }
 
 
    void initialize(){
 
        drain::Logger mout(getImgLog(), "GaussianStripe", __FUNCTION__);
 
        this->setImageLimits();
        this->setLoopLimits();
 
        //const int n = this->conf.width*this->conf.height; // width*1 or 1*height
        // (DIR?this->conf.width:this->conf.height);
        const int n    = std::max(this->conf.frame.width, this->conf.frame.height); // width*1 or 1*height
        const int bias = std::min(this->iRange.min, this->jRange.min);
        lookUp.resize(n);
        //weightSum = 0.0;
        value_t f;
        const double radiusAbs  = this->conf.radius * static_cast<value_t>(n)*0.5;
        const double radiusAbs2 = radiusAbs*radiusAbs;
        if (radiusAbs <= 0.0){
            mout.error("Zero radius2: " , radiusAbs );
        }
 
        int iNorm;
        mout.debug("frame:" , this->conf.frame );
        for (int i = 0; i < n; ++i) {
            iNorm = (i + bias);
            f = exp2(-static_cast<double>(iNorm*iNorm) / radiusAbs2);
            lookUp[i]  = f;
            weightSum += f;
            mout.debug(i , '\t' , iNorm , '\t' , f , '\t' , weightSum );
        }
        mout.debug("weightSum = " , weightSum );
 
        scaleResult = this->src.getScaling().getScale() / this->dst.getScaling().getScale();
        mout.debug("scale = " , scaleResult );
 
        //this->coordinateHandler.setLimits(srcWidth, srcHeight);
        //this->coordinateHandler.setLimits(this->src.getWidth(), this->src.getHeight());
 
    }
 
 
    // Copied from sliding window
    void setSize(size_t width = 1){
        this->Window<GaussianWindowConf,R>::setSize(width, 1);
    }
 
protected:
 
    virtual
    void setSize(size_t width, size_t height){
        drain::Logger mout(getImgLog(), "SlidingStripe", __FUNCTION__);
        if (height > 1)
            mout.warn("horz stripe, height(" , height , ") discarded" );
        Window<GaussianWindowConf,R>::setSize(width, 1);
    }
 
 
protected:
 
    std::vector<value_t> lookUp;
 
 
    virtual
    void write() {
        this->dst.put(this->location, value);
    };
 
protected:
 
    // Truncated sum of the gaussian weights (typically close to 1.0)
    value_t weightSum;
 
    mutable
    value_t value;
 
    value_t scaleResult;
    // value_t scaleResultWeight;  // consider!
 
    virtual
    void update(); // = 0;
 
    mutable
    Point2D<int> locationTmp;
 
    // Weighted version only:
    value_t w;
    value_t sumW;
 
};
 
 
 
template <bool DIR=true>
class GaussianStripeWeighted : public GaussianStripe<DIR, WeightedWindowCore> {
 
public:
 
    GaussianStripeWeighted(int n, double radius=1.0) : GaussianStripe<DIR, WeightedWindowCore>(n, radius) {
    };
 
protected:
 
    virtual
    inline
    void write(){
        this->dst.put(this->location, this->value);
        this->dstWeight.put(this->location, this->weightSum);
    };
 
 
};
 
 
}  // image::
 
}  // drain::
 
#endif
 
// Drain