CalculateOptimalScale.cpp

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// -*- c-basic-offset: 4 -*-
#include "CalculateOptimalScale.h"

#include <panotools/PanoToolsInterface.h>


namespace HuginBase {

double CalculateOptimalScale::calcOptimalScale(PanoramaData& panorama)
{
    if (panorama.getNrOfImages() == 0)
        return 1;

    PanoramaOptions opt = panorama.getOptions();
    double scale = 0;

    for (unsigned i = 0; i < panorama.getNrOfImages(); i++) {
        double s = calcOptimalPanoScale(panorama.getSrcImage(i), opt);
        if (scale < s) {
            scale = s;
        }
    }

    return scale;
}


double CalculateOptimalScale::calcOptimalPanoScale(const SrcPanoImage & src,
                                                    const PanoramaOptions & dest)
{
    // calculate the input pixel per output pixel ratio at the panorama center.

    PTools::Transform transf;
    SrcPanoImage timg = src;
    timg.setRoll(0);
    timg.setPitch(0);
    timg.setYaw(0);
    timg.setX(0);
    timg.setY(0);
    timg.setZ(0);
    transf.createTransform(timg, dest);
    hugin_utils::FDiff2D imgp1;
    hugin_utils::FDiff2D imgp2;

    transf.transform(imgp1, hugin_utils::FDiff2D(0, 0));
    transf.transform(imgp2, hugin_utils::FDiff2D(1, 1));
    double dist = hugin_utils::norm(imgp2-imgp1);

    return dist / sqrt(2.0);

    /*
        // calculate average pixel density of each image
        // and use the highest one to calculate the width
        double density=0;
        double w = imgSize.x;
        switch (imgProj) {
            case Lens::RECTILINEAR:
                density = 1/RAD_TO_DEG(atan(2*tan(DEG_TO_RAD(v)/2)/w));
                break;
            case Lens::CIRCULAR_FISHEYE:
            case Lens::FULL_FRAME_FISHEYE:
                // if we assume the linear fisheye model: r = f * theta
                // then we get the same pixel density as for cylindrical and equirect
            case Lens::EQUIRECTANGULAR:
            case Lens::PANORAMIC:
                density = w / v;
                break;
        }
        // TODO: use density properly based on the output projection.
        double width = roundi(density * opt.getHFOV());
        */
}


} //namespace

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