convolution.h

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#pragma once
 
#include <pcl/filters/filter.h>
#include <pcl/pcl_base.h>
#include <pcl/pcl_macros.h>
#include <pcl/point_types.h>
 
namespace pcl {
 
/// Point cloud containing edge information.
struct EIGEN_ALIGN16 PointXYZIEdge {
  PCL_ADD_POINT4D; // preferred way of adding a XYZ+padding
  float magnitude;
  float direction;
  float magnitude_x;
  float magnitude_y;
  PCL_MAKE_ALIGNED_OPERATOR_NEW // make sure our new allocators are aligned
};                              // enforce SSE padding for correct memory alignment
 
/// A 2D convolution class.
template <typename PointT>
class Convolution : public Filter<PointT> {
public:
  using Filter<PointT>::input_;
 
  /**
   * Extra pixels are added to the input image so that convolution can be performed over
   * the entire image.
   *
   * (kernel_height/2) rows are added before the first row and after the last row
   * (kernel_width/2) columns are added before the first column and after the last
   * column border options define what values are set for these extra rows and columns
   *
   * Assume that the three rows of right edge of the image looks like this:
   *    .. 3 2 1
   *    .. 6 5 4
   *    .. 9 8 7
   *
   * BOUNDARY_OPTION_CLAMP : the extra pixels are set to the pixel value of the boundary
   * pixel. This option makes it seem as if it were:
   *    .. 3 2 1| 1 1 1 ..
   *    .. 6 5 4| 4 4 4 ..
   *    .. 9 8 7| 7 7 7 ..
   *
   * BOUNDARY_OPTION_MIRROR : the input image is mirrored at the boundary. This option
   * makes it seem as if it were:
   *    .. 3 2 1| 1 2 3 ..
   *    .. 6 5 4| 4 5 6 ..
   *    .. 9 8 7| 7 8 9 ..
   *
   * BOUNDARY_OPTION_ZERO_PADDING : the extra pixels are simply set to 0. This option
   * makes it seem as if it were:
   *    .. 3 2 1| 0 0 0 ..
   *    .. 6 5 4| 0 0 0 ..
   *    .. 9 8 7| 0 0 0 ..
   *
   * Note that the input image is not actually extended in size. Instead, based on these
   * options, the convolution is performed differently at the border pixels.
   */
  enum BOUNDARY_OPTIONS_ENUM {
    BOUNDARY_OPTION_CLAMP,
    BOUNDARY_OPTION_MIRROR,
    BOUNDARY_OPTION_ZERO_PADDING
  };
 
  Convolution() { boundary_options_ = BOUNDARY_OPTION_CLAMP; }
 
  /** \brief Sets the kernel to be used for convolution
   * \param[in] kernel convolution kernel passed by reference
   */
  inline void
  setKernel(const pcl::PointCloud<PointT>& kernel)
  {
    kernel_ = kernel;
  }
 
  /**
   * \param[in] boundary_options enum indicating the boundary options to be used for
   * convolution
   */
  inline void
  setBoundaryOptions(BOUNDARY_OPTIONS_ENUM boundary_options)
  {
    boundary_options_ = boundary_options;
  }
 
  /** \brief Performs 2D convolution of the input point cloud with the kernel.
   * Uses clamp as the default boundary option.
   * \param[out] output Output point cloud passed by reference
   */
  void
  filter(pcl::PointCloud<PointT>& output);
 
protected:
  /** \brief This is an over-ride function for the pcl::Filter interface. */
  void
  applyFilter(pcl::PointCloud<PointT>&) override
  {}
 
private:
  BOUNDARY_OPTIONS_ENUM boundary_options_;
  pcl::PointCloud<PointT> kernel_;
};
} // namespace pcl
 
#include <pcl/2d/impl/convolution.hpp>
 
POINT_CLOUD_REGISTER_POINT_STRUCT(pcl::PointXYZIEdge,                //
                                  (float, x, x)                      //
                                  (float, y, y)                      //
                                  (float, z, z)                      //
                                  (float, magnitude, magnitude)      //
                                  (float, direction, direction)      //
                                  (float, magnitude_x, magnitude_x)  //
                                  (float, magnitude_y, magnitude_y)) //