Revision 5f23fb0b6e1d50d996ac54daaa7e637e5d8decaf authored by Software Heritage on 05 May 2020, 00:00:00 UTC, committed by Software Heritage on 27 June 2020, 00:00:00 UTC
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lib_sift.h
/**
* @file lib_sift.h
* @brief The SIFT algorithmic chain
*
*
* @author Ives Rey-Otero <ivesreyotero@gmail.com>
*/
#ifndef _LIB_SIFT_H_
#define _LIB_SIFT_H_
#include <stdio.h>
#include <stdbool.h>
/** @brief the SIFT keypoint structure
*
* contains the position and orientation of the keypoint and the 128 descriptor
* from the original SIFT method.
*/
struct sift_keypoint_std
{
float x;
float y;
float scale;
float orientation;
unsigned char descriptor[128];
};
/** @brief: compute the keypoints of an image (position, scale and orientation)
* Does not extract the SIFT descriptor
*
* x input image of dimensions w \times h
* n points to the integer that stores the number of extracted keypoints.
*/
struct sift_keypoint_std* sift_compute_points(const float* x, int w, int h,
int* n);
/** @brief: compute the descriptors of a given set of oriented keypoints
*
* The oriented keypoints are provided by the user as a flat list of keypoint
* structure.
*/
void sift_fill_descriptors(const float *x, int w, int h,
struct sift_keypoint_std *k, int n);
/** @brief: compute the descriptors of a given set of oriented keypoints
*
* The keypoints are provided by the user as a flat list of keypoint structure.
* The routine computes one principal orientation and one descriptor per keypoint.
*/
void sift_find_ori_and_fill_descriptors(const float *x, int w, int h,
struct sift_keypoint_std *k, int n);
/** @brief: compute keypoints and their descriptors (The standard SIFT method)
*/
struct sift_keypoint_std *sift_compute_features(const float *x, int w, int h,
int *n);
// input and output of SIFT features
struct sift_keypoint_std *sift_read_from_file(const char *filename, int *n);
// Read SIFT keypoints location (x, y, sigma) from a file
struct sift_keypoint_std *sift_read_keyslocation_from_file(char *filename, int *n);
void sift_write_to_file(const char *filename, const struct sift_keypoint_std *k, int n, bool binary);
void fprintf_keypoint_std(FILE* f, const struct sift_keypoint_std* k, int n);
#endif
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