Method update

dlib/image_processing/correlation_tracker.h:177–211

        template <typename image_type>
        double update (
            const image_type& img,
            const drectangle& guess
        )
        {
            double psr = update_noscale(img, guess);

            // Now predict the scale change
            make_scale_space(img, Fs);
            for (unsigned long i = 0; i < Fs.size(); ++i)
                fft_inplace(Fs[i]);
            Gs = 0;
            for (unsigned long i = 0; i < Fs.size(); ++i)
                Gs += pointwise_multiply(Fs[i],conj(As[i]));
            Gs = pointwise_multiply(Gs, reciprocal(Bs+get_regularizer_scale()));
            ifft_inplace(Gs);
            const double pos = max_point_interpolated(real(Gs)).y();

            // update the rectangle's scale
            position *= std::pow(get_scale_pyramid_alpha(), pos-(double)get_num_scale_levels()/2);



            // Now update the scale filters
            make_scale_target_location_image(pos, Gs);
            Bs *= (1-get_nu_scale());
            for (unsigned long i = 0; i < Fs.size(); ++i)
            {
                As[i] = get_nu_scale()*pointwise_multiply(Gs, Fs[i]) + (1-get_nu_scale())*As[i];
                Bs += get_nu_scale()*(squared(real(Fs[i]))+squared(imag(Fs[i])));
            }


            return psr;
        }

        template <typename image_type>
        double update_noscale (