algorithms.hpp

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#ifndef ALGORITHMS_HPP
#define ALGORITHMS_HPP

#include <vigra/multi_array.hxx>
#include <vigra/matrix.hxx>

#include "point.hpp"
#include "types.hpp"

namespace sift {
    namespace alg {
        const vigra::MultiArray<2, f32_t> convolveWithGauss(const vigra::MultiArray<2, f32_t>&, 
                f32_t);

        const vigra::MultiArray<2, f32_t> reduceToNextLevel(const vigra::MultiArray<2, f32_t>&, 
                f32_t);

        const vigra::MultiArray<2, f32_t> increaseToNextLevel(const vigra::MultiArray<2, f32_t>&,
                f32_t);

        const vigra::MultiArray<2, f32_t> dog(const vigra::MultiArray<2, f32_t>&, 
                const vigra::MultiArray<2, f32_t>&);

        const vigra::Matrix<f32_t> foDerivative(const std::array<vigra::MultiArray<2, f32_t>, 3>&, const Point<u16_t, u16_t>&);

        const vigra::Matrix<f32_t> soDerivative(const std::array<vigra::MultiArray<2, f32_t>, 3>&, const Point<u16_t, u16_t>&);

        f32_t gradientMagnitude(const vigra::MultiArray<2, f32_t>&, const Point<u16_t, u16_t>&);

        f32_t gradientOrientation(const vigra::MultiArray<2, f32_t>&, const Point<u16_t, u16_t>&);

        const std::array<f32_t, 36> orientationHistogram36(const vigra::MultiArray<2, f32_t>&, 
                const vigra::MultiArray<2, f32_t>& , const vigra::MultiArray<2, f32_t>&);

        const std::vector<f32_t> orientationHistogram8(const vigra::MultiArray<2, f32_t>&,
                const vigra::MultiArray<2, f32_t>&, const vigra::MultiArray<2, f32_t>&);

        f32_t vertexParabola(const Point<u16_t, f32_t>&, const Point<u16_t, f32_t>&, 
                const Point<u16_t, f32_t>&);

        std::array<Point<f32_t, f32_t>, 4> rotateShape(const Point<u16_t, u16_t>&, f32_t, const u16_t, const u16_t);

        void normalizeVector(std::vector<f32_t>&);
    }
}
#endif //ALGORITHMS_HPP