CGAL::Shape_detection::Region_growing< InputRange, NeighborQuery, RegionType, SeedMap > Class Template Reference

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

Definition

template<typename InputRange, typename NeighborQuery, typename RegionType, typename SeedMap = CGAL::Identity_property_map<std::size_t>>
class CGAL::Shape_detection::Region_growing< InputRange, NeighborQuery, RegionType, SeedMap >

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,
• the SeedMap property map enables to define the seeding order of items and skip unnecessary items.

Template Parameters

InputRange	must be a model of ConstRange.
NeighborQuery	must be a model of NeighborQuery.
RegionType	must be a model of RegionType.
SeedMap	must be an LvaluePropertyMap whose key and value types are std::size_t. Default is CGAL::Identity_property_map.

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_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.

Initialization
	Region_growing (const InputRange &input_range, NeighborQuery &neighbor_query, RegionType &region_type, const SeedMap seed_map=SeedMap())
	initializes the region growing algorithm. More...

Detection
template<typename OutputIterator >
OutputIterator	detect (OutputIterator regions)
	runs the region growing algorithm and fills an output iterator with the found regions. More...

Unassigned Items
template<typename OutputIterator >
OutputIterator	unassigned_items (OutputIterator output) const
	fills an output iterator with indices of all unassigned items. More...

Constructor & Destructor Documentation

Region_growing()

template<typename InputRange , typename NeighborQuery , typename RegionType , typename SeedMap = CGAL::Identity_property_map<std::size_t>>

CGAL::Shape_detection::Region_growing< InputRange, NeighborQuery, RegionType, SeedMap >::Region_growing	(	const InputRange &	input_range,
		NeighborQuery &	neighbor_query,
		RegionType &	region_type,
		const SeedMap	seed_map = SeedMap()
	)

initializes the region growing algorithm.

Parameters

input_range	a range of input items for region growing
neighbor_query	an instance of NeighborQuery that is used internally to access item's neighbors
region_type	an instance of RegionType that is used internally to control if items form a valid region type
seed_map	an instance of SeedMap property map that is used internally to set the order of items in the region growing processing queue. If it maps to std::size_t(-1), the corresponding item is skipped.

Precondition

input_range.size() > 0

Member Function Documentation

detect()

template<typename InputRange , typename NeighborQuery , typename RegionType , typename SeedMap = CGAL::Identity_property_map<std::size_t>>

template<typename OutputIterator >

OutputIterator CGAL::Shape_detection::Region_growing< InputRange, NeighborQuery, RegionType, SeedMap >::detect

(

OutputIterator

regions

)

runs the region growing algorithm and fills an output iterator with the found regions.

Template Parameters

OutputIterator

must be an output iterator whose value type is std::vector<std::size_t>.

Parameters

regions

an output iterator that stores regions, where each region is returned as a vector of indices of the items, which belong to this region

Returns

past-the-end position in the output sequence

Examples:

Shape_detection/region_growing_circles_on_point_set_2.cpp.

unassigned_items()

template<typename InputRange , typename NeighborQuery , typename RegionType , typename SeedMap = CGAL::Identity_property_map<std::size_t>>

template<typename OutputIterator >

OutputIterator CGAL::Shape_detection::Region_growing< InputRange, NeighborQuery, RegionType, SeedMap >::unassigned_items

(

OutputIterator

output

)

const

fills an output iterator with indices of all unassigned items.

Template Parameters

OutputIterator

must be an output iterator whose value type is std::size_t.

Parameters

output

an output iterator that stores indices of all items, which are not assigned to any region

Returns

past-the-end position in the output sequence