lti::curvatureFeature Class Reference

The curvature feature is similar to the lti::orientationFeature, but instead of creating a histogram of the pixel orientations, a histogram of the curvature of a pixel will be done, considering also the "relevance" channel when constructing it. More...

#include <ltiCurvatureFeature.h>

Inheritance diagram for lti::curvatureFeature:

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List of all members.

Classes
class	parameters
	the parameters for the class curvatureFeature More...
Public Member Functions
	curvatureFeature ()
	curvatureFeature (const curvatureFeature &other)
virtual	~curvatureFeature ()
virtual const char *	getTypeName () const
bool	apply (const channel &orientation, const channel &relevance, dvector &dest) const
bool	apply (const channel &orientation, const channel &relevance, channel &dest) const
bool	apply (const channel &orientation, const channel &relevance, channel &dest, dvector &vct) const
curvatureFeature &	copy (const curvatureFeature &other)
curvatureFeature &	operator= (const curvatureFeature &other)
virtual functor *	clone () const
const parameters &	getParameters () const

Detailed Description

The curvature feature is similar to the lti::orientationFeature, but instead of creating a histogram of the pixel orientations, a histogram of the curvature of a pixel will be done, considering also the "relevance" channel when constructing it.

All values in the relevance channel smaller than the relevanceThreshold will be ignored (will be marked with zero curvature).

The curvature is defined as the derivative of the tangent of a given contour. This will be approximated here using the differences of orientation between the neighbour pixels.

Constructor & Destructor Documentation

lti::curvatureFeature::curvatureFeature ( )

default constructor

lti::curvatureFeature::curvatureFeature ( const curvatureFeature & other )

copy constructor

Parameters:

other

the object to be copied

virtual lti::curvatureFeature::~curvatureFeature ( ) [virtual]

destructor

Member Function Documentation

bool lti::curvatureFeature::apply	(	const channel &	orientation,
		const channel &	relevance,
		channel &	dest,
		dvector &	vct
	)			const

Computes a curvature channel and the corresponding feature vector from the given orientation and relevance channels.

Parameters:

	orientation	channel with the angle of the tangent for all pixels
	relevance	channel with a "relevance"-degree for the orientation channel. Values of 0 mean, the angle in the orientation channel has to be ignored, and 1 that the value in the orientation channel is reliable.
	dest	channel with the curvature value computed for each pixel.
	vct	feature vector

Returns:: true if apply successful or false otherwise.

bool lti::curvatureFeature::apply	(	const channel &	orientation,
		const channel &	relevance,
		channel &	dest
	)			const

Computes a curvature channel from the given orientation and relevance channels.

Parameters:

	orientation	channel with the angle of the tangent for all pixels
	relevance	channel with a "relevance"-degree for the orientation channel. Values of 0 mean, the angle in the orientation channel has to be ignored, and 1 that the value in the orientation channel is reliable.
	dest	channel with the curvature value computed for each pixel.

Returns:: true if apply successful or false otherwise.

bool lti::curvatureFeature::apply	(	const channel &	orientation,
		const channel &	relevance,
		dvector &	dest
	)			const

compute the feature vector

Parameters:

	orientation	channel with the angle of the tangent for all pixels
	relevance	channel with a "relevance"-degree for the orientation channel. Values of 0 mean, the angle in the orientation channel has to be ignored, and 1 that the value in the orientation channel is reliable.
	dest	feature vector.