CGAL 6.0 - Shape Detection
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CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap > Class Template Reference

#include <CGAL/Shape_detection/Region_growing/Region_growing.h>

Definition

template<typename NeighborQuery, typename RegionType, typename RegionMap = typename RegionType::Region_index_map>
class CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap >

Main class/entry point for running the region growing algorithm.

This version of the region growing algorithm enables to detect regions in a set of user-defined items

  • given a way to access neighbors of each item via the NeighborQuery parameter class and
  • control if items form a valid region type via the RegionType parameter class,
  • optional SeedRange defining the seeding order of items and skipping unnecessary items.
Template Parameters
NeighborQuerya model of NeighborQuery
RegionTypea model of RegionType
RegionMapa model of ReadWritePropertyMap whose key type is Item and value type is std::size_t.
Examples
Shape_detection/region_growing_circles_on_point_set_2.cpp, Shape_detection/region_growing_cylinders_on_point_set_3.cpp, Shape_detection/region_growing_lines_on_point_set_2.cpp, Shape_detection/region_growing_lines_on_segment_set.cpp, Shape_detection/region_growing_planes_on_point_set_3.cpp, Shape_detection/region_growing_planes_on_polygon_mesh.cpp, Shape_detection/region_growing_spheres_on_point_set_3.cpp, and Shape_detection/region_growing_with_custom_classes.cpp.

Types

using Item = typename RegionType::Item
 Item type.
 
using Region = std::vector< Item >
 
using Primitive_and_region = std::pair< typename Region_type::Primitive, Region >
 Primitive and region type.
 
using Region_map = RegionMap
 Item to region property map.
 

Initialization (RegionMap is the default type)

template<typename InputRange , typename ItemMap = Default>
 Region_growing (const InputRange &input_range, NeighborQuery &neighbor_query, RegionType &region_type, ItemMap item_map=ItemMap())
 initializes the region growing algorithm.
 
template<typename InputRange , typename SeedRange , typename ItemMap = Default>
 Region_growing (const InputRange &input_range, SeedRange &seed_range, NeighborQuery &neighbor_query, RegionType &region_type, ItemMap item_map=ItemMap())
 initializes the region growing algorithm.
 

Initialization (RegionMap is a user provided type)

template<typename InputRange , typename ItemMap = Default>
 Region_growing (const InputRange &input_range, NeighborQuery &neighbor_query, RegionType &region_type, Region_map rm, ItemMap item_map=ItemMap())
 initializes the region growing algorithm.
 
template<typename InputRange , typename SeedRange , typename ItemMap = Default>
 Region_growing (const InputRange &input_range, SeedRange &seed_range, NeighborQuery &neighbor_query, RegionType &region_type, Region_map rm, ItemMap item_map=ItemMap())
 initializes the region growing algorithm.
 

Detection

template<typename PrimitiveAndRegionOutputIterator = Emptyset_iterator>
PrimitiveAndRegionOutputIterator detect (PrimitiveAndRegionOutputIterator region_out=PrimitiveAndRegionOutputIterator())
 runs the region growing algorithm and fills an output iterator with the fitted primitive and their region.
 
const Region_mapregion_map ()
 provides a property map that provides the region index (or std::size_t(-1)) for each input element.
 

Unassigned Items

template<typename InputRange , typename ItemOutputIterator , typename ItemMap = Default>
ItemOutputIterator unassigned_items (const InputRange &input_range, ItemOutputIterator output, ItemMap item_map=ItemMap()) const
 fills an output iterator with all unassigned items.
 

Constructor & Destructor Documentation

◆ Region_growing() [1/4]

template<typename NeighborQuery , typename RegionType , typename RegionMap = typename RegionType::Region_index_map>
template<typename InputRange , typename ItemMap = Default>
CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap >::Region_growing ( const InputRange &  input_range,
NeighborQuery neighbor_query,
RegionType region_type,
ItemMap  item_map = ItemMap() 
)

initializes the region growing algorithm.

Template Parameters
InputRangea model of ConstRange
ItemMapa model of ReadablePropertyMap with InputRange::const_iterator as key type and Item as value type. A default can be deduced using the value type of InputRange and Item to be either CGAL::Dereference_property_map or CGAL::Identity_property_map.
Parameters
input_rangea range of input items for region growing.
neighbor_queryan instance of NeighborQuery that is used internally to access item's neighbors
region_typean instance of RegionType that is used internally to control if items form a valid region type
item_mapan instance of the property map to retrieve items from input values
Precondition
input_range.size() > 0

◆ Region_growing() [2/4]

template<typename NeighborQuery , typename RegionType , typename RegionMap = typename RegionType::Region_index_map>
template<typename InputRange , typename SeedRange , typename ItemMap = Default>
CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap >::Region_growing ( const InputRange &  input_range,
SeedRange &  seed_range,
NeighborQuery neighbor_query,
RegionType region_type,
ItemMap  item_map = ItemMap() 
)

initializes the region growing algorithm.

Template Parameters
InputRangea model of ConstRange
SeedRangea model of ConstRange with Item as value type
ItemMapa model of ReadablePropertyMap with InputRange::const_iterator as key type and Item as value type. A default can be deduced using the value type of InputRange and Item to be either CGAL::Dereference_property_map or CGAL::Identity_property_map.
Parameters
input_rangea range of input items for region growing
neighbor_queryan instance of NeighborQuery that is used internally to access item's neighbors
region_typean instance of RegionType that is used internally to control if items form a valid region type
seed_rangea vector of Item that is used as seeds for the region growing. Defaults to the full input_range.
item_mapan instance of the property map to retrieve items from input values
Precondition
input_range.size() > 0

◆ Region_growing() [3/4]

template<typename NeighborQuery , typename RegionType , typename RegionMap = typename RegionType::Region_index_map>
template<typename InputRange , typename ItemMap = Default>
CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap >::Region_growing ( const InputRange &  input_range,
NeighborQuery neighbor_query,
RegionType region_type,
Region_map  rm,
ItemMap  item_map = ItemMap() 
)

initializes the region growing algorithm.

Template Parameters
InputRangea model of ConstRange
ItemMapa model of ReadablePropertyMap with InputRange::const_iterator as key type and Item as value type. A default can be deduced using the value type of InputRange and Item to be either CGAL::Dereference_property_map or CGAL::Identity_property_map.
Parameters
input_rangea range of input items for region growing.
neighbor_queryan instance of NeighborQuery that is used internally to access item's neighbors
region_typean instance of RegionType that is used internally to control if items form a valid region type
item_mapan instance of the property map to retrieve items from input values
rmexternal property map that will be filled when calling detect()
Precondition
input_range.size() > 0

◆ Region_growing() [4/4]

template<typename NeighborQuery , typename RegionType , typename RegionMap = typename RegionType::Region_index_map>
template<typename InputRange , typename SeedRange , typename ItemMap = Default>
CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap >::Region_growing ( const InputRange &  input_range,
SeedRange &  seed_range,
NeighborQuery neighbor_query,
RegionType region_type,
Region_map  rm,
ItemMap  item_map = ItemMap() 
)

initializes the region growing algorithm.

Template Parameters
InputRangea model of ConstRange
SeedRangea model of ConstRange with Item as value type
ItemMapa model of ReadablePropertyMap with InputRange::const_iterator as key type and Item as value type. A default can be deduced using the value type of InputRange and Item to be either CGAL::Dereference_property_map or CGAL::Identity_property_map.
Parameters
input_rangea range of input items for region growing
neighbor_queryan instance of NeighborQuery that is used internally to access item's neighbors
region_typean instance of RegionType that is used internally to control if items form a valid region type
seed_rangea vector of Item that is used as seeds for the region growing. Defaults to the full input_range.
item_mapan instance of the property map to retrieve items from input values
rmexternal property map that will be filled when calling detect()
Precondition
input_range.size() > 0

Member Function Documentation

◆ detect()

template<typename NeighborQuery , typename RegionType , typename RegionMap = typename RegionType::Region_index_map>
template<typename PrimitiveAndRegionOutputIterator = Emptyset_iterator>
PrimitiveAndRegionOutputIterator CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap >::detect ( PrimitiveAndRegionOutputIterator  region_out = PrimitiveAndRegionOutputIterator())

runs the region growing algorithm and fills an output iterator with the fitted primitive and their region.

Template Parameters
PrimitiveAndRegionOutputIteratora model of OutputIterator whose value type is Primitive_and_region
Parameters
region_outan output iterator of type PrimitiveAndRegionOutputIterator.
Returns
past-the-end position in the output sequence

◆ region_map()

template<typename NeighborQuery , typename RegionType , typename RegionMap = typename RegionType::Region_index_map>
const Region_map & CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap >::region_map ( )

provides a property map that provides the region index (or std::size_t(-1)) for each input element.

Returns
Property map that maps each iterator of the input range to a region index.

◆ unassigned_items()

template<typename NeighborQuery , typename RegionType , typename RegionMap = typename RegionType::Region_index_map>
template<typename InputRange , typename ItemOutputIterator , typename ItemMap = Default>
ItemOutputIterator CGAL::Shape_detection::Region_growing< NeighborQuery, RegionType, RegionMap >::unassigned_items ( const InputRange &  input_range,
ItemOutputIterator  output,
ItemMap  item_map = ItemMap() 
) const

fills an output iterator with all unassigned items.

Template Parameters
ItemOutputIteratora model of OutputIterator whose value type is Item
InputRangea model of ConstRange
ItemMapa model of ReadablePropertyMap with InputRange::const_iterator as key type and Item as value type. A default can be deduced using the value type of InputRange and Item to be either CGAL::Dereference_property_map or CGAL::Identity_property_map.
Parameters
input_rangea range of input items for region growing
outputan iterator of type PrimitiveAndRegionOutputIterator.
item_mapan instance of the property map to retrieve items from input values
Returns
past-the-end position in the output sequence