Gradient.h

// Gradient feature extraction class interface
// Written by Sergey G. Kosov in 2015 for Project X
#pragma once

#include "ILocalFeatureExtractor.h"

namespace DirectGraphicalModels { namespace fex
{
    const static float GRADIENT_MAX_VALUE = 255 * sqrtf(2);
    // ================================ Gradient Class ==============================
    class CGradient : public ILocalFeatureExtractor
    {
    friend class CHOG;
    public:
        DllExport CGradient(const Mat &img) : ILocalFeatureExtractor(img) {}
        DllExport virtual ~CGradient(void) {}

        DllExport virtual Mat get(void) const {return get(m_img);}

        DllExport static Mat get(const Mat &img, float mid = GRADIENT_MAX_VALUE);

    protected:
        static Mat getDerivativeX(const Mat &img);
        static Mat getDerivativeY(const Mat &img);
    };
} }