integral_image2D.h

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 * $Id: integral_image2D.h 4702 2012-02-23 09:39:33Z gedikli $
 */

#ifndef PCL_INTEGRAL_IMAGE2D_H_
#define PCL_INTEGRAL_IMAGE2D_H_

#include <vector>

namespace pcl
{
  template <typename DataType>
  struct IntegralImageTypeTraits
  {
    typedef DataType Type;
    typedef DataType IntegralType;
  };

  template <>
  struct IntegralImageTypeTraits<float>
  {
    typedef float Type;
    typedef double IntegralType;
  };

  template <>
  struct IntegralImageTypeTraits<char>
  {
    typedef char Type;
    typedef int IntegralType;
  };

  template <>
  struct IntegralImageTypeTraits<short>
  {
    typedef short Type;
    typedef long IntegralType;
  };

  template <>
  struct IntegralImageTypeTraits<unsigned short>
  {
    typedef unsigned short Type;
    typedef unsigned long IntegralType;
  };

  template <>
  struct IntegralImageTypeTraits<unsigned char>
  {
    typedef unsigned char Type;
    typedef unsigned int IntegralType;
  };

  template <>
  struct IntegralImageTypeTraits<int>
  {
    typedef int Type;
    typedef long IntegralType;
  };

  template <>
  struct IntegralImageTypeTraits<unsigned int>
  {
    typedef unsigned int Type;
    typedef unsigned long IntegralType;
  };

  template <class DataType, unsigned Dimension>
  class IntegralImage2D
  {
    public:
      static const unsigned second_order_size = (Dimension * (Dimension + 1)) >> 1;
      typedef Eigen::Matrix<typename IntegralImageTypeTraits<DataType>::IntegralType, Dimension, 1> ElementType;
      typedef Eigen::Matrix<typename IntegralImageTypeTraits<DataType>::IntegralType, second_order_size, 1> SecondOrderType;

      IntegralImage2D (bool compute_second_order_integral_images)
        : width_ (1)
        , height_ (1)
        , compute_second_order_integral_images_ (compute_second_order_integral_images)
      {
      }

      virtual
      ~IntegralImage2D () { }

      void 
      setSecondOrderComputation (bool compute_second_order_integral_images);

      void
      setInput (const DataType * data,
                unsigned width, unsigned height, unsigned element_stride, unsigned row_stride);

      inline ElementType
      getFirstOrderSum (unsigned start_x, unsigned start_y, unsigned width, unsigned height) const;

      inline SecondOrderType
      getSecondOrderSum (unsigned start_x, unsigned start_y, unsigned width, unsigned height) const;

      inline unsigned
      getFiniteElementsCount (unsigned start_x, unsigned start_y, unsigned width, unsigned height) const;
    private:
      typedef Eigen::Matrix<typename IntegralImageTypeTraits<DataType>::Type, Dimension, 1> InputType;

      void
      computeIntegralImages (const DataType * data, unsigned row_stride, unsigned element_stride);

      std::vector<ElementType, Eigen::aligned_allocator<ElementType> > first_order_integral_image_;
      std::vector<SecondOrderType, Eigen::aligned_allocator<SecondOrderType> > second_order_integral_image_;
      std::vector<unsigned> finite_values_integral_image_;

      unsigned width_;
      unsigned height_;

      bool compute_second_order_integral_images_;
   };

  template <class DataType>
  class IntegralImage2D <DataType, 1>
  {
    public:
      static const unsigned second_order_size = 1;
      typedef typename IntegralImageTypeTraits<DataType>::IntegralType ElementType;
      typedef typename IntegralImageTypeTraits<DataType>::IntegralType SecondOrderType;

      IntegralImage2D (bool compute_second_order_integral_images)
        : width_ (1), height_ (1), compute_second_order_integral_images_ (compute_second_order_integral_images)
      {
      }

      virtual
      ~IntegralImage2D () { }

      void
      setInput (const DataType * data,
                unsigned width, unsigned height, unsigned element_stride, unsigned row_stride);

      inline ElementType
      getFirstOrderSum (unsigned start_x, unsigned start_y, unsigned width, unsigned height) const;

      inline SecondOrderType
      getSecondOrderSum (unsigned start_x, unsigned start_y, unsigned width, unsigned height) const;

      inline unsigned
      getFiniteElementsCount (unsigned start_x, unsigned start_y, unsigned width, unsigned height) const;
    private:
    //  typedef typename IntegralImageTypeTraits<DataType>::Type InputType;

      void
      computeIntegralImages (const DataType * data, unsigned row_stride, unsigned element_stride);

      std::vector<ElementType, Eigen::aligned_allocator<ElementType> > first_order_integral_image_;
      std::vector<SecondOrderType, Eigen::aligned_allocator<SecondOrderType> > second_order_integral_image_;
      std::vector<unsigned> finite_values_integral_image_;

      unsigned width_;
      unsigned height_;

      bool compute_second_order_integral_images_;
   };
 }

#include <pcl/features/impl/integral_image2D.hpp>

#endif    // PCL_INTEGRAL_IMAGE2D_H_