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

Detailed Description

Author

Andrea Vedaldi

Brian Fulkerson

Function Documentation

_vl_dsift_alloc_buffers()

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.

_vl_dsift_free_buffers()

static void _vl_dsift_free_buffers ( VlDsiftFilter *  self )

static

Parameters

self	DSIFT filter.

_vl_dsift_new_kernel()

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.

_vl_dsift_normalize_histogram()

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.

_vl_dsift_update_buffers()

void _vl_dsift_update_buffers

(

VlDsiftFilter *

self

)

_vl_dsift_with_flat_window()

void _vl_dsift_with_flat_window ( VlDsiftFilter *  self )

inline

Parameters

self	DSIFT filter object.

_vl_dsift_with_gaussian_window()

void _vl_dsift_with_gaussian_window ( VlDsiftFilter *  self )

inline

Parameters

self	DSIFT filter.

vl_dsift_delete()

void vl_dsift_delete

(

VlDsiftFilter *

self

)

Parameters

self	DSIFT filter.

vl_dsift_new()

VlDsiftFilter* vl_dsift_new	(	int	imWidth,
		int	imHeight
	)

Parameters

imWidth	width of the image.
imHeight	height of the image

Returns

new filter.

vl_dsift_new_basic()

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.

vl_dsift_process()

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

Parameters

self	DSIFT filter.
im	image data.