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imgfeatures.h File Reference
#include <mrpt/otherlibs/do_opencv_includes.h>
Include dependency graph for imgfeatures.h:

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Classes

struct  feature
 
Structure to represent an affine invariant image feature. More...
 

Macros

#define FEATURE_OXFD_COLOR   CV_RGB(255, 255, 0)
 
#define FEATURE_LOWE_COLOR   CV_RGB(255, 0, 255)
 
#define FEATURE_MAX_D   128
 max feature descriptor length More...
 

Enumerations

enum  feature_type { FEATURE_OXFD, FEATURE_LOWE }
 FEATURE_OXFD
FEATURE_LOWE. More...
 
enum  feature_match_type { FEATURE_FWD_MATCH, FEATURE_BCK_MATCH, FEATURE_MDL_MATCH }
 FEATURE_FWD_MATCH
FEATURE_BCK_MATCH
FEATURE_MDL_MATCH. More...
 

Functions

int import_features (char *filename, int type, struct feature **feat)
 
Reads image features from file. More...
 
int export_features (char *filename, struct feature *feat, int n)
 
Exports a feature set to a file formatted depending on the type of features, as specified in the feature struct's type field. More...
 
void draw_features (IplImage *img, struct feature *feat, int n)
 
Displays a set of features on an image More...
 
double descr_dist_sq (struct feature *f1, struct feature *f2)
 
Calculates the squared Euclidian distance between two feature descriptors. More...
 

Macro Definition Documentation

◆ FEATURE_LOWE_COLOR

#define FEATURE_LOWE_COLOR   CV_RGB(255, 0, 255)

Definition at line 38 of file imgfeatures.h.

◆ FEATURE_MAX_D

#define FEATURE_MAX_D   128

max feature descriptor length

Definition at line 41 of file imgfeatures.h.

◆ FEATURE_OXFD_COLOR

#define FEATURE_OXFD_COLOR   CV_RGB(255, 255, 0)

Definition at line 37 of file imgfeatures.h.

Enumeration Type Documentation

◆ feature_match_type

FEATURE_FWD_MATCH
FEATURE_BCK_MATCH
FEATURE_MDL_MATCH.

Enumerator
FEATURE_FWD_MATCH 
FEATURE_BCK_MATCH 
FEATURE_MDL_MATCH 

Definition at line 29 of file imgfeatures.h.

◆ feature_type

FEATURE_OXFD
FEATURE_LOWE.

Enumerator
FEATURE_OXFD 
FEATURE_LOWE 

Definition at line 22 of file imgfeatures.h.

Function Documentation

◆ descr_dist_sq()

double descr_dist_sq ( struct feature f1,
struct feature f2 
)


Calculates the squared Euclidian distance between two feature descriptors.

Parameters
f1first feature
f2second feature
Returns
Returns the squared Euclidian distance between the descriptors of f1 and f2.

◆ draw_features()

void draw_features ( IplImage *  img,
struct feature feat,
int  n 
)


Displays a set of features on an image

Parameters
imgimage on which to display features
featarray of Oxford-type features
nnumber of features

◆ export_features()

int export_features ( char *  filename,
struct feature feat,
int  n 
)


Exports a feature set to a file formatted depending on the type of features, as specified in the feature struct's type field.

Parameters
filenamename of file to which to export features
featfeature array
nnumber of features
Returns
Returns 0 on success or 1 on error

◆ import_features()

int import_features ( char *  filename,
int  type,
struct feature **  feat 
)


Reads image features from file.

The file should be formatted as from the code provided by the Visual Geometry Group at Oxford or from the code provided by David Lowe.

Parameters
filenamelocation of a file containing image features
typedetermines how features are input. If type is FEATURE_OXFD, the input file is treated as if it is from the code provided by the VGG at Oxford: http://www.robots.ox.ac.uk:5000/~vgg/research/affine/index.html

If type is FEATURE_LOWE, the input file is treated as if it is from David Lowe's SIFT code: http://www.cs.ubc.ca/~lowe/keypoints
featpointer to an array in which to store imported features
Returns
Returns the number of features imported from filename or -1 on error



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