lti::orientationMap Class Reference

Generate an orientation map of a given channel. More...

#include <ltiOrientationMap.h>

Inheritance diagram for lti::orientationMap:

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Collaboration diagram for lti::orientationMap:

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List of all members.

Classes
class	parameters
	the parameters for the class orientationMap More...
Public Member Functions
	orientationMap ()
	orientationMap (const orientationMap &other)
virtual	~orientationMap ()
virtual const char *	getTypeName () const
bool	apply (const channel &src, channel &direction, channel &relevance) const
bool	apply (const channel8 &src, channel8 &direction, channel8 &relevance) const
orientationMap &	copy (const orientationMap &other)
virtual functor *	clone () const
const parameters &	getParameters () const
Protected Member Functions
channel &	ogdMap (const channel &src, channel &direction, channel &relevance) const
channel &	gradientMap (const channel &src, channel &direction, channel &relevance) const

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Detailed Description

Generate an orientation map of a given channel.

There are two modes for this functor:

• The first one is based on the gradient approximation of the channel values, which will consider the whole frequency spectrum for the orientation estimation.

• The second mode is base on some characteristics of the first order oriented gaussian derivative to calculate the direction with the maximal energy. The use of this steerable filters allows the consideration of just one frequency band. It is much slower than the gradient mode.

The result of the analysis are two channels:

In the gradient mode the first resulting channel contains the angle (in radians) of the local gradient. The second channel contains the magnitude of the gradient.

In the ogd mode the first channel will contain the angle (in radians) with the local maximal energy, and the second channel contains a relevance-ratio of the obtained direction.

Note that the return angle is always perpendicular to the edge direction.

The angular value lies between -Pi and Pi.

Warning:

: This functor is too old, maybe you are just looking for the lti::gradientFunctor in the polar coordinates mode.

See also:

orientationMap::parameters

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Constructor & Destructor Documentation

lti::orientationMap::orientationMap

(

)

default constructor

lti::orientationMap::orientationMap

(

const orientationMap &

other

)

copy constructor

Parameters:

other

the object to be copied

virtual lti::orientationMap::~orientationMap

(

)

[virtual]

destructor

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Member Function Documentation

bool lti::orientationMap::apply	(	const channel8 &	src,
		channel8 &	direction,
		channel8 &	relevance
	)			const

generate the orientation map

Parameters:

	src	channel8 with the source data.
	direction	channel8 where the direction will be left. The values will be between -Pi and Pi.
	relevance	channel8 with values between 0 and 1, which specify how relevant the direction information is.

Returns:

true if successful, false otherwise.

bool lti::orientationMap::apply	(	const channel &	src,
		channel &	direction,
		channel &	relevance
	)			const

generate the orientation map

Parameters:

	src	channel with the source data.
	direction	channel where the direction will be left. The values will be between -Pi and Pi.
	relevance	channel with values between 0 and 1, which specify how relevant the direction information is.

Returns:

true if successful, false otherwise.

virtual functor* lti::orientationMap::clone

(

)

const [virtual]

returns a pointer to a clone of this functor.

Implements lti::functor.

orientationMap& lti::orientationMap::copy

(

const orientationMap &

other

)

copy data of "other" functor.

Parameters:

other

the functor to be copied

Returns:

a reference to this functor object

Reimplemented from lti::functor.

const parameters& lti::orientationMap::getParameters

(

)

const

returns used parameters

Reimplemented from lti::transform.

virtual const char* lti::orientationMap::getTypeName

(

)

const [virtual]

returns the name of this type ("orientationMap")

Reimplemented from lti::transform.

channel& lti::orientationMap::gradientMap	(	const channel &	src,
		channel &	direction,
		channel &	relevance
	)			const [protected]

generate the orientation map

Parameters:

	src	channel with the source data.
	direction	channel where the direction will be left. The values will be between -Pi and Pi.
	relevance	channel with values between 0 and 1, which specify how relevant the direction information is.

Returns:

a reference to the direction.

channel& lti::orientationMap::ogdMap	(	const channel &	src,
		channel &	direction,
		channel &	relevance
	)			const [protected]

generate the orientation map

Parameters:

	src	channel with the source data.
	direction	channel where the direction will be left. The values will be between -Pi and Pi.
	relevance	channel with values between 0 and 1, which specify how relevant the direction information is.

Returns:

a reference to the direction.

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The documentation for this class was generated from the following file:

• ltiOrientationMap.h