Reference Manual

Ange Clément

This package provides methods to extract a feature graph from three-dimensional surface data. A feature graph is a data structure that represent the sharp lines on the surface. The goal of the feature detection methods is to construct lines that can be used for future mesh generation.

Introduced in: CGAL 6.2
BibTeX: cgal:c-fg-26a
License: GPL

The feature graph is extracted in multiple steps. First, a sharpness evaluation is conducted on the surface elements. Then, from this measure, smooth elements are discarded, and a graph thinning process generates lines that are guaranteed to be positioned along the highest values of the measure. Finally, the result is refined with a correction step and an optimization phase to ensure the correct placement of lines and corners along estimated normals.

Classified Reference Pages

Concepts

Concepts representing the input surfaces:

• FeatureImage_3
• FaceListGraph

Secondary concepts:

• SharpnessEstimator
• NormalEstimator

Feature graph creation functors

• CGAL::Feature_graph::Detect_sharp_features_on_labeled_image()
• CGAL::Feature_graph::Detect_sharp_features_on_surface()

Parameter classes

• CGAL::Feature_graph::Regularization_parameters_on_image
• CGAL::Feature_graph::Regularization_parameters_on_surface
• CGAL::Feature_graph::Optimization_parameters_on_image
• CGAL::Feature_graph::Optimization_parameters_on_surface

Sharpness estimators

• CGAL::Feature_graph::AmbrosioTortorelli_on_image::Sharpness_functor
• CGAL::Feature_graph::Sharpness_estimator::Sharpness_estimator_on_surface

Normal estimators

• CGAL::Feature_graph::AmbrosioTortorelli_on_image::Normal_functor
• CGAL::Feature_graph::Normal_estimator::Normal_estimator_on_surface

Modules
	Concepts
	Feature Graph Detector
	The functors in this group allows to extract the feature graph from different types of surfaces.
	Sharpness Estimator
	The functors in this group allows to estimate the sharpness on surfaces.
	Normal Estimator
	The functors in this group allows to estimate the normal on surfaces.
	Parameter Class
	The classes in this group provide various parameters for the feature detection.

Classes
struct	CGAL::Feature_graph::AmbrosioTortorelli_on_image< Vector_3 >
	Class that evaluates the Ambriosio-Tortorelli normals and sharpness measure from an image. More...