ConvolveImage.h

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// -*- LSST-C++ -*-

/*
 * LSST Data Management System
 * Copyright 2008, 2009, 2010 LSST Corporation.
 *
 * This product includes software developed by the
 * LSST Project (http://www.lsst.org/).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the LSST License Statement and
 * the GNU General Public License along with this program.  If not,
 * see <http://www.lsstcorp.org/LegalNotices/>.
 */

#ifndef LSST_AFW_MATH_CONVOLVEIMAGE_H
#define LSST_AFW_MATH_CONVOLVEIMAGE_H

#include <limits>
#include <sstream>

#include "lsst/pex/exceptions.h"
#include "lsst/afw/geom.h"
#include "lsst/afw/image/Image.h"
#include "lsst/afw/image/MaskedImage.h"
#include "lsst/afw/math/Kernel.h"

namespace lsst {
namespace afw {
namespace math {

    class ConvolutionControl {
    public:
        ConvolutionControl(
                bool doNormalize = true,    
                bool doCopyEdge = false,    
                int maxInterpolationDistance = 10  
                )
        :
            _doNormalize(doNormalize),
            _doCopyEdge(doCopyEdge),
            _maxInterpolationDistance(maxInterpolationDistance)
        { }

        bool getDoNormalize() const { return _doNormalize; }
        bool getDoCopyEdge() const { return _doCopyEdge; }
        int getMaxInterpolationDistance() const { return _maxInterpolationDistance; };

        void setDoNormalize(bool doNormalize) {_doNormalize = doNormalize; }
        void setDoCopyEdge(bool doCopyEdge) { _doCopyEdge = doCopyEdge; }
        void setMaxInterpolationDistance(int maxInterpolationDistance) {
            _maxInterpolationDistance = maxInterpolationDistance; }

    private:
        bool _doNormalize;  
        bool _doCopyEdge;   
        int _maxInterpolationDistance;  
    };

    template <typename OutImageT, typename InImageT>
    void scaledPlus(
            OutImageT &outImage,
            double c1,
            InImageT const &inImage1,
            double c2,
            InImageT const &inImage2);

    template <typename OutImageT, typename InImageT>
    inline typename OutImageT::SinglePixel convolveAtAPoint(
            typename InImageT::const_xy_locator inImageLocator,
            typename lsst::afw::image::Image<lsst::afw::math::Kernel::Pixel>::const_xy_locator kernelLocator,
            int kWidth,
            int kHeight);

    template <typename OutImageT, typename InImageT>
    inline typename OutImageT::SinglePixel convolveAtAPoint(
            typename InImageT::const_xy_locator inImageLocator,
            std::vector<lsst::afw::math::Kernel::Pixel> const& kernelColList,
            std::vector<lsst::afw::math::Kernel::Pixel> const& kernelRowList);

    template <typename OutImageT, typename InImageT, typename KernelT>
    void convolve(
            OutImageT& convolvedImage,
            InImageT const& inImage,
            KernelT const& kernel,
            ConvolutionControl const& convolutionControl = ConvolutionControl());

    template <typename OutImageT, typename InImageT, typename KernelT>
    void convolve(
            OutImageT& convolvedImage,
            InImageT const& inImage,
            KernelT const& kernel,
            bool doNormalize,
            bool doCopyEdge = false);

    template <typename ImageT>
    typename ImageT::SinglePixel edgePixel(
            lsst::afw::image::detail::Image_tag
    ) {
        typedef typename ImageT::SinglePixel SinglePixelT;
        return SinglePixelT(
            std::numeric_limits<SinglePixelT>::has_quiet_NaN ?
                std::numeric_limits<SinglePixelT>::quiet_NaN() : 0);
    }

    template <typename MaskedImageT>
    typename MaskedImageT::SinglePixel edgePixel(
            lsst::afw::image::detail::MaskedImage_tag
    ) {
        typedef typename MaskedImageT::Image::Pixel ImagePixelT;
        typedef typename MaskedImageT::Variance::Pixel VariancePixelT;

        return typename MaskedImageT::SinglePixel(
            std::numeric_limits<ImagePixelT>::has_quiet_NaN ?
                std::numeric_limits<ImagePixelT>::quiet_NaN() : 0,
            MaskedImageT::Mask::getPlaneBitMask("NO_DATA"),
            std::numeric_limits<VariancePixelT>::infinity());
    }
}}}   // lsst::afw::math

/*
 * Define inline functions
 */

template <typename OutImageT, typename InImageT>
inline typename OutImageT::SinglePixel lsst::afw::math::convolveAtAPoint(
        typename InImageT::const_xy_locator inImageLocator, 
        lsst::afw::image::Image<lsst::afw::math::Kernel::Pixel>::const_xy_locator kernelLocator,
        int kWidth,     
        int kHeight)    
{
    typename OutImageT::SinglePixel outValue = 0;
    for (int kRow = 0; kRow != kHeight; ++kRow) {
        for (lsst::afw::image::Image<lsst::afw::math::Kernel::Pixel>::const_xy_locator kEnd =
            kernelLocator + lsst::afw::image::detail::difference_type(kWidth, 0);
            kernelLocator != kEnd; ++inImageLocator.x(), ++kernelLocator.x()) {
            typename lsst::afw::math::Kernel::Pixel const kVal = kernelLocator[0];
            if (kVal != 0) {
                outValue += *inImageLocator*kVal;
            }
        }

        inImageLocator  += lsst::afw::image::detail::difference_type(-kWidth, 1);
        kernelLocator += lsst::afw::image::detail::difference_type(-kWidth, 1);
    }

    return outValue;
}

template <typename OutImageT, typename InImageT>
inline typename OutImageT::SinglePixel lsst::afw::math::convolveAtAPoint(
        typename InImageT::const_xy_locator inImageLocator,   
        std::vector<lsst::afw::math::Kernel::Pixel> const &kernelXList,  
        std::vector<lsst::afw::math::Kernel::Pixel> const &kernelYList)  
{
    typedef typename std::vector<lsst::afw::math::Kernel::Pixel>::const_iterator k_iter;

    typedef typename OutImageT::SinglePixel OutT;
    OutT outValue = 0;
    for (k_iter kernelYIter = kernelYList.begin(), yEnd = kernelYList.end();
         kernelYIter != yEnd; ++kernelYIter) {

        OutT outValueY = 0;
        for (k_iter kernelXIter = kernelXList.begin(), xEnd = kernelXList.end();
             kernelXIter != xEnd; ++kernelXIter, ++inImageLocator.x()) {
            typename lsst::afw::math::Kernel::Pixel const kValX = *kernelXIter;
            if (kValX != 0) {
                outValueY += *inImageLocator*kValX;
            }
        }

        double const kValY = *kernelYIter;
        if (kValY != 0) {
            outValue += outValueY*kValY;
        }

        inImageLocator += lsst::afw::image::detail::difference_type(-kernelXList.size(), 1);
    }

    return outValue;
}


#endif // !defined(LSST_AFW_MATH_CONVOLVEIMAGE_H)