auxiliary Namespace Reference

An auxiliary interface functions for armadillo library. More...

Classes
class	circular_buffer
	A minimal implementation of circular buffer class. More...
class	fetch_error
	defines fetch error exception More...
class	image_fetcher
	An implementation of image fetcher. More...
class	Size
	Template class for size type. More...
class	Image
	A template image class. More...

Enumerations
enum	border_type {   constant, reflect, replicate, warp,   reflect101, transparent }
	Various border types, image boundaries are denoted with '|'. More...

Functions
char	PathSeparator ()
template<typename pixel_type >
Image< pixel_type >	blur (const Image< pixel_type > &img, const mat &h)
	Gaussian blur with given blur kernel. More...
template<typename T1 , typename T2 >
void	integral (const arma::Mat< T1 > &A, arma::Mat< T2 > &I)
	Compute integral. More...
template<typename T1 , typename T2 , typename T3 >
void	integral (const Image< T1 > &img, Image< T2 > &sum, Image< T3 > &sqsum)
	Compute integral images. More...
arma::uword	borderInterpolate (int p, int n, border_type type=reflect101)
	Computes the location of an extrapolated pixel. More...
template<typename T1 , typename T2 >
void	pyrDown (const T1 &in, T2 &out)
	Blurs an image and downsamples it. This function performs the downsampling step of the Gaussian pyramid construction. First, it convolves the source image with the kernel: \[ \frac{1}{256} \begin{bmatrix} 1 & 4 & 6 & 4 & 1 \\ 4 & 16 & 24 & 16 & 4 \\ 6 & 24 & 36 & 24 & 6 \\ 4 & 16 & 24 & 16 & 4 \\ 1 & 4 & 6 & 4 & 1 \end{bmatrix} \] Then, it downsamples the image by rejecting even rows and columns. More...

Detailed Description

An auxiliary interface functions for armadillo library.

Enumeration Type Documentation

enum auxiliary::border_type

Various border types, image boundaries are denoted with '|'.

Enumerator
constant	iii | abcde | iii with some specified 'i'
reflect	cba | abcde | edc
replicate	aaa | abcde | eee
warp	cde | abcde | abc
reflect101	dcb | abcde | dcb
transparent	not specified

Function Documentation

template<typename pixel_type >

Image<pixel_type> auxiliary::blur ( const Image< pixel_type > &  img, const mat &  h  )

inline

Gaussian blur with given blur kernel.

Parameters

img	An input image.
h	The blur kernel.

Returns

The blurred image.

arma::uword auxiliary::borderInterpolate ( int  p, int  n, border_type  type = reflect101  )

inline

Computes the location of an extrapolated pixel.

Parameters

p	0-based coordinate of the extrapolated pixel along one of the axes.
n	Length of the array along the corresponding axis.
type	Border type, one of the border_type.

template<typename T1 , typename T2 >

void auxiliary::integral	(	const arma::Mat< T1 > &	A,
		arma::Mat< T2 > &	I
	)

Compute integral.

template<typename T1 , typename T2 , typename T3 >

void auxiliary::integral	(	const Image< T1 > &	img,
		Image< T2 > &	sum,
		Image< T3 > &	sqsum
	)

Compute integral images.

Parameters

[in]	img	input image
[out]	sum	integral image
[out]	sqsum	squared integral image

char auxiliary::PathSeparator ( )

inline

template<typename T1 , typename T2 >

void auxiliary::pyrDown	(	const T1 &	in,
		T2 &	out
	)

Blurs an image and downsamples it.
This function performs the downsampling step of the Gaussian pyramid construction.
First, it convolves the source image with the kernel:

\[ \frac{1}{256} \begin{bmatrix} 1 & 4 & 6 & 4 & 1 \\ 4 & 16 & 24 & 16 & 4 \\ 6 & 24 & 36 & 24 & 6 \\ 4 & 16 & 24 & 16 & 4 \\ 1 & 4 & 6 & 4 & 1 \end{bmatrix} \]

Then, it downsamples the image by rejecting even rows and columns.

Parameters

in
out

Note

This function is preliminary; it is not yet fully optimized.

See Also

PyrDownVec_32s8u in pyramid.cpp of OpenCV