dsift.c File Reference

Dense SIFT - Definition. More...

#include "dsift.h"
#include "pgm.h"
#include "mathop.h"
#include "imopv.h"
#include <math.h>
#include <string.h>

Functions
float *	_vl_dsift_new_kernel (int binSize, int numBins, int binIndex, double windowSize)
	Initialize new convolution kernel.
float	_vl_dsift_normalize_histogram (float *begin, float *end)
	Normalize histogram.
static void	_vl_dsift_free_buffers (VlDsiftFilter *self)
	Free internal buffers.
void	_vl_dsift_update_buffers (VlDsiftFilter *self)
	Updates internal buffers to current geometry.
static void	_vl_dsift_alloc_buffers (VlDsiftFilter *self)
	Allocate internal buffers.
VlDsiftFilter *	vl_dsift_new (int imWidth, int imHeight)
	Create a new DSIFT filter.
VlDsiftFilter *	vl_dsift_new_basic (int imWidth, int imHeight, int step, int binSize)
	Create a new DSIFT filter (basic interface)
void	vl_dsift_delete (VlDsiftFilter *self)
	Delete DSIFT filter.
void	_vl_dsift_with_gaussian_window (VlDsiftFilter *self)
	Process with Gaussian window.
void	_vl_dsift_with_flat_window (VlDsiftFilter *self)
	Process with flat window.
void	vl_dsift_process (VlDsiftFilter *self, float const *im)
	Compute keypoints and descriptors.

---

Detailed Description

Author:

Andrea Vedaldi

Brian Fulkerson

---

Function Documentation

static void _vl_dsift_alloc_buffers ( VlDsiftFilter *  self )

static

Parameters:

self	DSIFT filter.

The function (re)allocates the internal buffers in accordance with the current image and descriptor geometry.

static void _vl_dsift_free_buffers ( VlDsiftFilter *  self )

static

Parameters:

self	DSIFT filter.

float* _vl_dsift_new_kernel	(	int	binSize,
		int	numBins,
		int	binIndex,
		double	windowSize
	)

Parameters:

binSize
numBins
binIndex	negative to use flat window.
windowSize

Returns:

a pointer to new filter.

float _vl_dsift_normalize_histogram ( float *  begin, float *  end  )

inline

Parameters:

begin	first element of the histogram.
end	last plus one element of the histogram.

The function divides the specified histogram by its l2 norm.

void _vl_dsift_update_buffers

(

VlDsiftFilter *

self

)

void _vl_dsift_with_flat_window ( VlDsiftFilter *  self )

inline

Parameters:

self	DSIFT filter object.

void _vl_dsift_with_gaussian_window ( VlDsiftFilter *  self )

inline

Parameters:

self	DSIFT filter.

void vl_dsift_delete

(

VlDsiftFilter *

self

)

Parameters:

self	DSIFT filter.

VlDsiftFilter* vl_dsift_new	(	int	imWidth,
		int	imHeight
	)

Parameters:

imWidth	width of the image.
imHeight	height of the image

Returns:

new filter.

VlDsiftFilter* vl_dsift_new_basic	(	int	imWidth,
		int	imHeight,
		int	step,
		int	binSize
	)

Parameters:

imWidth	width of the image.
imHeight	height of the image.
step	sampling step.
binSize	bin size.

Returns:

new filter.

The descriptor geometry matches the standard SIFT descriptor.

void vl_dsift_process	(	VlDsiftFilter *	self,
		float const *	im
	)

Parameters:

self	DSIFT filter.
im	image data.