#include <CGAL/Classification/Label_set.h>

Definition

sets of Label used as input by classification algorithms.

Public Types
using	const_iterator = unspecified_type
	A random access constant iterator with value type `Label_handle`.

using	iterator = unspecified_type
	A random access iterator with value type `Label_handle`.

Constructors
	Label_set ()

	Label_set (std::initializer_list< const char * > labels)
	constructs a label set from a set of label names.

Modifications
Label_handle	add (const char *name, CGAL::IO::Color color, std::size_t standard_index=-1)
	adds a label.

Label_handle	add (const char *name)
	adds a label with default standard index and color.

bool	remove (Label_handle label)
	removes a label.

void	clear ()
	removes all labels.

Access
const_iterator	begin () const

iterator	begin ()

const_iterator	end () const

iterator	end ()

std::size_t	size () const
	returns how many labels are defined.

Label_handle	operator[] (std::size_t i) const
	returns the \(i^{th}\) label.

Validity
template<typename LabelIndexRange >
bool	is_valid_ground_truth (const LabelIndexRange &ground_truth, bool verbose=false) const
	checks the validity of the ground truth with respect to the label set.

Member Function Documentation

Label_handle CGAL::Classification::Label_set::add ( const char * name )

adds a label with default standard index and color.

This functions tries to map label names to standard ASPRS labels and automatically picks the standard_index and color of the label:

"unassigned" is given standard index 2 and color (0, 0, 0)
"ground" is given standard index 2 and color (186, 189, 182)
"low_vegetation" is given standard index 3 and color (78, 154, 6)
"medium_vegetation" is given standard index 4 and color (138, 226, 52)
"high_vegetation" is given standard index 5 and color (204, 255, 201)
"building" is given standard index 6 and color (245, 121, 0)
"noise" is given standard index 7 and color (128, 0, 0)
"reserved" is given standard index 8 and color (233, 185, 110)
"water" is given standard index 9 and color (114, 159, 207)
"rail" is given standard index 10 and color (136, 46, 25)
"road_surface" is given standard index 11 and color (56, 56, 56)
"reserved_2" is given standard index 12 and color (193, 138, 51)
"wire_guard" is given standard index 13 and color (37, 61, 136)
"wire_conductor" is given standard index 14 and color (173, 127, 168)
"transmission_tower" is given standard index 15 and color (136, 138, 133)
"wire_connect" is given standard index 16 and color (145, 64, 236)
"bridge_deck" is given standard index 17 and color (213, 93, 93)
"high_noise" is given standard index 18 and color (255, 0, 0)

If the name is not found, the label is given standard index std::size_t(-1) and a random color.

Note: Names are not used for identification: two labels in the same set can have the same name but not the same handle. Each call to add() generates a new distinct label.

Parameters

name	name of the label.

Label_handle CGAL::Classification::Label_set::add	(	const char *	name,
		CGAL::IO::Color	color,
		std::size_t	standard_index = `-1`
	)

adds a label.

Note: Names, standard indices and colors are not used for identification: two labels in the same set can have the same name, standard index or color, but not the same handle. Each call to add() generates a new distinct label.

Parameters

name	name of the label.
color	used to represent the label.
standard_index	standard index of the classification label (i.e. index in the ASPRS standard).

template<typename LabelIndexRange >

bool CGAL::Classification::Label_set::is_valid_ground_truth	(	const LabelIndexRange &	ground_truth,
		bool	verbose = `false`
	)		const

checks the validity of the ground truth with respect to the label set.

Parameters

ground_truth	range of label indices. This function checks that all these indices are either -1 (for unclassified) or a valid index of one of the labels. If at least one of the indices is out of range, this function returns `false`, otherwise it returns `true`.
verbose	if set to `true`, the number of inliers of each label, the number of unclassified items and the potential number of out-of-range items are displayed. Otherwise, this function does not display anything.

bool CGAL::Classification::Label_set::remove ( Label_handle label )

removes a label.

Parameters

label the handle to the label that must be removed.

Returns: true if the label was correctly removed, false if its handle was not found.