lti::qmfEnergy Class Reference

The qmfEnergy is a functor for extraction of texture features. More...

#include <ltiQmfEnergy.h>

Inheritance diagram for lti::qmfEnergy:

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Collaboration diagram for lti::qmfEnergy:

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List of all members.

Classes
class	parameters
	the parameters for the class qmfEnergy More...
Public Member Functions
	qmfEnergy ()
	qmfEnergy (const parameters &param)
	qmfEnergy (const qmfEnergy &other)
virtual	~qmfEnergy ()
virtual const char *	getTypeName () const
bool	apply (const image &src, dvector &feature) const
bool	apply (channel &srcdest) const
bool	apply (const channel &src, channel &dest) const
bool	apply (const channel &src, dvector &dest) const
qmfEnergy &	copy (const qmfEnergy &other)
virtual functor *	clone () const
const parameters &	getParameters () const
Protected Member Functions
void	getChannels (const channel &chnl, std::vector< channel > &chnls) const
void	padChannel (const int &levels, const channel &chnl, channel &padchnl) const

Detailed Description

The qmfEnergy is a functor for extraction of texture features.

As described in Alvarado et. al. "Axon2 - A visual object recognition system for non-rigid objects" SPPAM 2001.

The channel will be separated using a QMF-Bank in several frecuency channels. After that the "energy" is calculated by applying the square function to each pixel. The resulting energy subchannels can be filtered using the so called "powerFilter". All channels are merged by upsampling the "smaller" resolutions or alternativelly by downsampling the higher resolutions.

The resulting images can be convolved with a gaussian kernel. The last optional step for the qmfEnergy is to apply the square root to each pixel.

From the resulting image an histogram can be generated.

Constructor & Destructor Documentation

lti::qmfEnergy::qmfEnergy ( )

default constructor

lti::qmfEnergy::qmfEnergy ( const parameters & param )

Constructor with parameters.

lti::qmfEnergy::qmfEnergy ( const qmfEnergy & other )

copy constructor

Parameters:

other

the object to be copied

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

destructor

Member Function Documentation

bool lti::qmfEnergy::apply	(	const channel &	src,
		dvector &	dest
	)			const `[virtual]`

extract the histogram of the energy image calculated from the given channel.

operates on a copy of the given parameters.

Parameters:

	src	channel with the source data.
	dest	feature vector generated as a histogram of the energy image

Returns:: true if apply successful or false otherwise.

Reimplemented from lti::globalFeatureExtractor.

bool lti::qmfEnergy::apply	(	const channel &	src,
		channel &	dest
	)			const

generate the energy image of the given channel operates on a copy of the given parameters.

Parameters:

	src	channel with the source data.
	dest	channel where the resulting energy image be left.

Returns:: true if apply successful or false otherwise.

bool lti::qmfEnergy::apply ( channel & srcdest ) const

generate the energy image of the given channel operates on the given parameter.

Parameters:

srcdest

channel with the source data. The resulting energy image will be left here too.

Returns:: true if apply successful or false otherwise.

bool lti::qmfEnergy::apply	(	const image &	src,
		dvector &	feature
	)			const `[virtual]`

extract histogram of energy image for each color channel of the given image.

Parameters:

	src	image with the source data.
	feature	the feature vector generated by the concatenation of the feature vector for each separated color channel RGB.