mask_map.cpp

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 *  Point Cloud Library (PCL) - www.pointclouds.org
 *  Copyright (c) 2010-2011, Willow Garage, Inc.
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#include <pcl/recognition/mask_map.h>

#include <assert.h>

pcl::MaskMap::MaskMap ()
  : data_ (0), width_ (0), height_ (0)
{
}

pcl::MaskMap::MaskMap (const size_t width, const size_t height)
  : data_ (), width_ (width), height_ (height)
{
  data_.resize (width*height);
}  

pcl::MaskMap::~MaskMap ()
{
}

void
pcl::MaskMap::resize (const size_t width, const size_t height)
{
  data_.resize (width*height);
  width_ = width;
  height_ = height;
}


void
pcl::MaskMap::getDifferenceMask (const MaskMap & mask0,
                                 const MaskMap & mask1,
                                 MaskMap & diff_mask)
{
  const size_t width = mask0.getWidth ();
  const size_t height = mask0.getHeight ();

  assert (width == mask1.getWidth ());
  assert (height == mask1.getHeight ());

  diff_mask.resize (width, height);
  diff_mask.reset ();

  for (size_t row_index = 0; row_index < height; ++row_index)
  {
    for (size_t col_index = 0; col_index < width; ++col_index)
    {
      if (mask0 (col_index, row_index) != mask1 (col_index, row_index))
      {
        diff_mask (col_index, row_index) = 255;
      }
    }
  }
}


void
pcl::MaskMap::erode (MaskMap & eroded_mask) const
{
  const MaskMap & mask_in = *this;
  eroded_mask.resize (width_, height_);

  for (size_t row_index = 1; row_index < height_-1; ++row_index)
  {
    for (size_t col_index = 1; col_index < width_-1; ++col_index)
    {
      if (!mask_in.isSet (col_index, row_index-1) ||
          !mask_in.isSet (col_index-1, row_index) ||
          !mask_in.isSet (col_index+1, row_index) ||
          !mask_in.isSet (col_index, row_index+1))
      {
        eroded_mask.unset (col_index, row_index);
      }
      else
      {
        eroded_mask.set (col_index, row_index);
      }
    }
  }
}