core/vil/algo/vil_median.h File Reference

Perform median filtering on images. More...

#include <vil/algo/vil_structuring_element.h>
#include <vil/vil_image_view.h>
#include <vcl_algorithm.h>

Go to the source code of this file.

Functions
template<class T , class Iter >
T	vil_sorted_value (const T *im, const vcl_ptrdiff_t *offset, Iter values, unsigned n, unsigned r)
	Return r-th sorted value of im[offset[k]].
template<class T >
T	vil_sorted_value (const vil_image_view< T > &image, unsigned plane, const vil_structuring_element &element, int i0, int j0, vcl_vector< T > &values, double r)
	Return (n*r)-th sorted value of pixels under element centred at (i0,j0).
template<class T >
void	vil_median (const vil_image_view< T > &src_image, vil_image_view< T > &dest_image, const vil_structuring_element &element)
	Computes median value of pixels under structuring element.

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Detailed Description

Perform median filtering on images.

Author:

Tim Cootes

Definition in file vil_median.h.

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Function Documentation

template<class T >

void vil_median	(	const vil_image_view< T > &	src_image,
		vil_image_view< T > &	dest_image,
		const vil_structuring_element &	element
	)

Computes median value of pixels under structuring element.

dest_image(i0,j0) is the median value of the pixels under the structuring element when it is centred on src_image(i0,j0)

Definition at line 15 of file vil_median.txx.

template<class T , class Iter >

T vil_sorted_value	(	const T *	im,
		const vcl_ptrdiff_t *	offset,
		Iter	values,
		unsigned	n,
		unsigned	r
	)		[inline]

Return r-th sorted value of im[offset[k]].

Values im[offset[k]] placed into values[k] then sorted. values should be a random access iterator into a container of T such that the range [values,values+n) is valid.

Definition at line 17 of file vil_median.h.

template<class T >

T vil_sorted_value	(	const vil_image_view< T > &	image,
		unsigned	plane,
		const vil_structuring_element &	element,
		int	i0,
		int	j0,
		vcl_vector< T > &	values,
		double	r
	)		[inline]

Return (n*r)-th sorted value of pixels under element centred at (i0,j0).

Parameters:

r	in [0,1].
values	used to store values sampled from image before sorting Checks boundary overlap

Definition at line 33 of file vil_median.h.