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Public Attributes | List of all members
sfm::Sift::Keypoint Struct Reference

Representation of a SIFT keypoint. More...

#include <sift.h>

Public Attributes

int octave
 Octave index of the keypoint.
 
float sample
 Sample index.
 
float x
 Keypoint x-coordinate.
 
float y
 Keypoint y-coordinate.
 

Detailed Description

Representation of a SIFT keypoint.

The keypoint locations are relative to the resampled size in the image pyramid. To get the size relative to the input image, each of (ix,iy,x,y) need to be multiplied with 2^o, where o is the octave index of the keypoint. The octave index is -1 for the upsampled image, 0 for the input image and >0 for subsampled images. Note that the scale of the KP is already relative to the input image.

Definition at line 120 of file sift.h.

Member Data Documentation

◆ octave

int sfm::Sift::Keypoint::octave

Octave index of the keypoint.

Can be negative.

Definition at line 123 of file sift.h.

◆ sample

float sfm::Sift::Keypoint::sample

Sample index.

Initally integer in {0 ... S-1}, later in [-1,S].

Definition at line 125 of file sift.h.

◆ x

float sfm::Sift::Keypoint::x

Keypoint x-coordinate.

Initially integer, later sub-pixel.

Definition at line 127 of file sift.h.

◆ y

float sfm::Sift::Keypoint::y

Keypoint y-coordinate.

Initially integer, later sub-pixel.

Definition at line 129 of file sift.h.


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