feature Struct Reference

Detailed Description

Structure to represent an affine invariant image feature.

The fields x, y, a, b, c represent the affine region around the feature:

a(x-u)(x-u) + 2b(x-u)(y-v) + c(y-v)(y-v) = 1

Definition at line 52 of file imgfeatures.h.

#include <sift-hess/imgfeatures.h>

Public Attributes
double	x
	x coord More...
double	y
	y coord More...
double	a
	Oxford-type affine region parameter. More...
double	b
	Oxford-type affine region parameter. More...
double	c
	Oxford-type affine region parameter. More...
double	scl
	scale of a Lowe-style feature More...
double	ori
	orientation of a Lowe-style feature More...
int	d
	descriptor length More...
double	descr [FEATURE_MAX_D]
	descriptor More...
int	type
	feature type, OXFD or LOWE More...
int	category
	all-purpose feature category More...
struct feature *	fwd_match
	matching feature from forward image More...
struct feature *	bck_match
	matching feature from backmward image More...
struct feature *	mdl_match
	matching feature from model More...
CvPoint2D64f	img_pt
	location in image More...
CvPoint2D64f	mdl_pt
	location in model More...
void *	feature_data
	user-definable data More...

Member Data Documentation

a

double feature::a

Oxford-type affine region parameter.

Definition at line 56 of file imgfeatures.h.

b

double feature::b

Oxford-type affine region parameter.

Definition at line 57 of file imgfeatures.h.

bck_match

struct feature* feature::bck_match

matching feature from backmward image

Definition at line 66 of file imgfeatures.h.

c

double feature::c

Oxford-type affine region parameter.

Definition at line 58 of file imgfeatures.h.

category

int feature::category

all-purpose feature category

Definition at line 64 of file imgfeatures.h.

d

int feature::d

descriptor length

Definition at line 61 of file imgfeatures.h.

Referenced by mrpt::vision::CFeatureExtraction::convertCvSeqInCFeatureList(), and mrpt::vision::CFeatureExtraction::insertCvSeqInCFeatureList().

descr

double feature::descr[FEATURE_MAX_D]

descriptor

Definition at line 62 of file imgfeatures.h.

Referenced by mrpt::vision::CFeatureExtraction::convertCvSeqInCFeatureList(), and mrpt::vision::CFeatureExtraction::insertCvSeqInCFeatureList().

feature_data

void* feature::feature_data

user-definable data

Definition at line 70 of file imgfeatures.h.

fwd_match

struct feature* feature::fwd_match

matching feature from forward image

Definition at line 65 of file imgfeatures.h.

img_pt

CvPoint2D64f feature::img_pt

location in image

Definition at line 68 of file imgfeatures.h.

Referenced by mrpt::vision::CFeatureExtraction::my_scale_space_extrema().

mdl_match

struct feature* feature::mdl_match

matching feature from model

Definition at line 67 of file imgfeatures.h.

mdl_pt

CvPoint2D64f feature::mdl_pt

location in model

Definition at line 69 of file imgfeatures.h.

ori

double feature::ori

orientation of a Lowe-style feature

Definition at line 60 of file imgfeatures.h.

Referenced by mrpt::vision::CFeatureExtraction::convertCvSeqInCFeatureList(), and mrpt::vision::CFeatureExtraction::insertCvSeqInCFeatureList().

scl

double feature::scl

scale of a Lowe-style feature

Definition at line 59 of file imgfeatures.h.

Referenced by mrpt::vision::CFeatureExtraction::convertCvSeqInCFeatureList(), mrpt::vision::CFeatureExtraction::insertCvSeqInCFeatureList(), and mrpt::vision::CFeatureExtraction::my_adjust_for_img_dbl().

type

int feature::type

feature type, OXFD or LOWE

Definition at line 63 of file imgfeatures.h.

x

double feature::x

x coord

Definition at line 54 of file imgfeatures.h.

Referenced by mrpt::vision::CFeatureExtraction::convertCvSeqInCFeatureList(), mrpt::vision::CFeatureExtraction::insertCvSeqInCFeatureList(), and mrpt::vision::CFeatureExtraction::my_scale_space_extrema().

y

double feature::y

y coord

Definition at line 55 of file imgfeatures.h.

Referenced by mrpt::vision::CFeatureExtraction::convertCvSeqInCFeatureList(), mrpt::vision::CFeatureExtraction::insertCvSeqInCFeatureList(), and mrpt::vision::CFeatureExtraction::my_scale_space_extrema().