VL::Detail Namespace Reference

Functions
std::istream &	operator>> (std::istream &is, _cmnt &manip)
	Extract a comment from a stream.
void	copy (pixel_t *dst, pixel_t const *src, int width, int height)
	Copy an image.
void	copyAndUpsampleRows (pixel_t *dst, pixel_t const *src, int width, int height)
	Copy an image upsampling two times.
void	copyAndDownsample (pixel_t *dst, pixel_t const *src, int width, int height, int d)
	Copy and downasample an image.
void	normalize_histogram (VL::float_t *L_begin, VL::float_t *L_end)
Variables
int const	expnTableSize = 256
VL::float_t const	expnTableMax = VL::float_t(25.0)
VL::float_t	expnTable [expnTableSize+1]
struct VL::Detail::buildExpnTable	_buildExpnTable
class VL::Detail::_cmnt	cmnt

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Function Documentation

void VL::Detail::copy	(	pixel_t *	dst,
		pixel_t const *	src,
		int	width,
		int	height
	)

Copy an image.

Parameters:

	dst	output imgage buffer.
	src	input image buffer.
	width	input image width.
	height	input image height.

Definition at line 258 of file sift.cc.

Referenced by basic_netbuf< charT, traits >::in_sync(), and VL::Sift::process().

void VL::Detail::copyAndDownsample	(	pixel_t *	dst,
		pixel_t const *	src,
		int	width,
		int	height,
		int	d
	)

Copy and downasample an image.

The image is downsampled d times, i.e. reduced to 1/2^d of its original size. The parameters width and height are the size of the input image. The destination image is assumed to be floor(width/2^d) pixels wide and floor(height/2^d) pixels high.

Parameters:

	dst	output imgage buffer.
	src	input image buffer.
	width	input image width.
	height	input image height.
	d	downsampling factor.

Definition at line 306 of file sift.cc.

Referenced by VL::Sift::process().

void VL::Detail::copyAndUpsampleRows	(	pixel_t *	dst,
		pixel_t const *	src,
		int	width,
		int	height
	)

Copy an image upsampling two times.

The destination buffer must be at least as big as two times the input buffer. Bilinear interpolation is used.

Parameters:

	dst	output imgage buffer.
	src	input image buffer.
	width	input image width.
	height	input image height.

Definition at line 275 of file sift.cc.

Referenced by VL::Sift::process().

void VL::Detail::normalize_histogram	(	VL::float_t *	L_begin,
		VL::float_t *	L_end
	)

Normalizes in norm L_2 a descriptor.

Definition at line 1197 of file sift.cc.

Referenced by VL::Sift::computeKeypointDescriptor().

std::istream& VL::Detail::operator>>	(	std::istream &	is,
		_cmnt &	manip
	)

Extract a comment from a stream.

The function extracts a block of consecutive comments from an input stream. A comment is a sequence of whitespaces, followed by a `#' character, other characters and terminated at the next line ending. A block of comments is just a sequence of comments.

Definition at line 88 of file sift.cc.

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Variable Documentation

struct VL::Detail::buildExpnTable VL::Detail::_buildExpnTable

class VL::Detail::_cmnt VL::Detail::cmnt

Comment eater istream manipulator

VL::float_t VL::Detail::expnTable

Definition at line 60 of file sift.cc.

Referenced by VL::fast_expn().

VL::float_t const VL::Detail::expnTableMax = VL::float_t(25.0)

Definition at line 59 of file sift.cc.

Referenced by VL::fast_expn().

int const VL::Detail::expnTableSize = 256

Definition at line 58 of file sift.cc.

Referenced by VL::fast_expn().