Feature Class Reference

The feature class holds the information about a feature found in an image. More...

#include <fv.h>

Inheritance diagram for Feature:

List of all members.

Public Member Functions
	Feature ()
double	norm ()
	returns the norm of the feature descriptor.
Public Attributes
vector< float >	descriptor
float	orientation
	Orientation of the feature = atan2f( dy, dx ).
float	dx
	X derivative in a 16x16 region around the feature centre.
float	dy
	Y derivative in a 16x16 region around the feature centre.
float	magnitude
	Magnitude of the gradient = sqrt( dx^2 + dy^2 ).

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Detailed Description

The feature class holds the information about a feature found in an image.

The feature class holds the information about a feature found in an image. It inherits from the Coords class, so has an x() and y() denoting its position in the image. See the fvutil.h file for some utility functions that operate on features. Currently these are created by the featureTrack object.

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Constructor & Destructor Documentation

Feature::Feature (   )  [inline]

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Member Function Documentation

double Feature::norm (   )  [inline]

returns the norm of the feature descriptor.

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Member Data Documentation

vector<float> Feature::descriptor

128 element feature descriptor (SIFT "key") It can be considered to "match" another another feature by calculating typical euclidean distance.

float Feature::dx

X derivative in a 16x16 region around the feature centre.

float Feature::dy

Y derivative in a 16x16 region around the feature centre.

float Feature::magnitude

Magnitude of the gradient = sqrt( dx^2 + dy^2 ).

float Feature::orientation

Orientation of the feature = atan2f( dy, dx ).

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

• fv.h

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