Method Desc_

jni/stasm/hat.cpp:399–432

// doubles (and with a float form of HatFit) was slower.

VEC Hat::Desc_( // return HAT descriptor, Init_ must be called first
    const double x,    // in: x coord of center of patch (may be off image)
    const double y)    // in: y coord of center of patch (may be off image)
    const
{
    CV_Assert(magmat_.rows);         // verify that Hat::Init_ was called

#if _OPENMP // can't be static because multiple instances
    vec_double        mags, orients;
    vec_double        histbins;
#else       // static faster since size rarely changes
    static vec_double mags, orients; // the image patch grad mags and orientations
    static vec_double histbins;      // the histograms
#endif

    GetMagsAndOrients(mags, orients,
                      cvRound(x), cvRound(y), patchwidth_,
                      magmat_, orientmat_, pixelweights_);

    GetHistograms(histbins,
                  patchwidth_, mags, orients,
                  row_indices_, row_fracs_, col_indices_, col_fracs_);

    WrapHistograms(histbins);        // wrap 360 degrees back to 0

    VEC desc(GRIDHEIGHT * GRIDWIDTH * BINS_PER_HIST, 1); // the HAT descriptor

    CopyHistsToDesc(desc,
                    histbins);

    NormalizeDesc(desc);

    return desc;
}

} // namespace stasm