IntensityDescriptorExtractor Class Reference

Extracts mean-normalized intensity patch around a pixel. More...

Public Member Functions
const int *	getDescriptorIndexOffsets () const
int	getDescriptorLength () const
int	getDescriptorStride () const
	IntensityDescriptorExtractor (int raw_gray_stride, int feature_window_size)
void	populateDescriptorAligned (uint8_t *image, int x, int y, uint8_t *descriptor) const
void	populateDescriptorInterp (uint8_t *image, float x, float y, uint8_t *descriptor) const
void	populateDescriptorsAligned (uint8_t *image, const KeypointData *keypoints, int num_keypoints, uint8_t *descriptors) const
void	populateDescriptorsInterp (uint8_t *image, const KeypointData *keypoints, int num_keypoints, uint8_t *descriptors) const

Detailed Description

Extracts mean-normalized intensity patch around a pixel.

Constructor & Destructor Documentation

IntensityDescriptorExtractor ( int  raw_gray_stride, int  feature_window_size  )

inline

Parameters

raw_gray_stride	specifies the number of bytes separating each row of the input image.
feature_window_size	the size of the descriptor window.

Member Function Documentation

void populateDescriptorInterp	(	uint8_t *	image,
		float	x,
		float	y,
		uint8_t *	descriptor
	)		const

Computes a single descriptor using bilinear interpolation at every point on the descriptor. This performs 4 floating point multiplications for every pixel in the descriptor.

Assumes that the output parameter is 16-byte aligned.

void populateDescriptorAligned	(	uint8_t *	image,
		int	x,
		int	y,
		uint8_t *	descriptor
	)		const

Computes a single descriptor. Assumes that the output parameter descriptor is 16-byte aligned.

void populateDescriptorsInterp	(	uint8_t *	image,
		const KeypointData *	keypoints,
		int	num_keypoints,
		uint8_t *	descriptors
	)		const

Compute many descriptors using bilinear interpolation.

Parameters

image	input image used for descriptor computation.
keypoints	keypoints for descriptor computation.
num_keypoints	the number of keypoints.
descriptors	Must be 16-byte aligned and pre-allocated to num_keypoints * 16 * getDescriptorStride() bytes.

void populateDescriptorsAligned	(	uint8_t *	image,
		const KeypointData *	keypoints,
		int	num_keypoints,
		uint8_t *	descriptors
	)		const

Compute many descriptors.

Parameters

image	input image used for descriptor computation.
keypoints	keypoints for descriptor computation.
num_keypoints	the number of keypoints.
descriptors	Must be 16-byte aligned and pre-allocated to num_keypoints * 16 * getDescriptorStride() bytes.

int getDescriptorStride ( ) const

inline

Returns

the number of bytes that should separate descriptors in a vector of keypoint descriptors. This is usually a multiple of 16 so that each descriptor is 16-byte aligned.

const int* getDescriptorIndexOffsets ( ) const

inline

Returns

an array of offset indices indicating the image offset of each descriptor pixel from the descriptor center pixel.

int getDescriptorLength ( ) const

inline

Returns

the number of useful bytes in each descriptor.

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

• intensity_descriptor.hpp