contrib/mul/vil3d/algo/vil3d_gauss_reduce.h File Reference

Functions to smooth and sub-sample 3D images in one direction. More...

#include <vil3d/vil3d_image_view.h>

Go to the source code of this file.

Defines
#define	VIL3D_GAUSS_REDUCE_INSTANTIATE(T)   extern "please include vil3d/vil3d_gauss_reduce.txx instead"
Functions
template<class T >
void	vil3d_gauss_reduce_i (const T *src_im, unsigned src_ni, unsigned src_nj, unsigned src_nk, vcl_ptrdiff_t s_i_step, vcl_ptrdiff_t s_j_step, vcl_ptrdiff_t s_k_step, T *dest_im, vcl_ptrdiff_t d_i_step, vcl_ptrdiff_t d_j_step, vcl_ptrdiff_t d_k_step)
	Smooth and subsample single plane src_im in i to produce dest_im.
template<class T >
void	vil3d_gauss_reduce (const vil3d_image_view< T > &src_im, vil3d_image_view< T > &dest_im, vil3d_image_view< T > &work_im1, vil3d_image_view< T > &work_im2)
	Smooth and subsample src_im to produce dest_im.
template<class T >
void	vil3d_gauss_reduce_ij (const vil3d_image_view< T > &src_im, vil3d_image_view< T > &dest_im, vil3d_image_view< T > &work_im1)
	Smooth and subsample src_im along i and j to produce dest_im.
template<class T >
void	vil3d_gauss_reduce_ik (const vil3d_image_view< T > &src_im, vil3d_image_view< T > &dest_im, vil3d_image_view< T > &work_im1)
	Smooth and subsample src_im along i and k to produce dest_im.
template<class T >
void	vil3d_gauss_reduce_jk (const vil3d_image_view< T > &src_im, vil3d_image_view< T > &dest_im, vil3d_image_view< T > &work_im1)
	Smooth and subsample src_im along j and k to produce dest_im.

---

Detailed Description

Functions to smooth and sub-sample 3D images in one direction.

These are not templated because

• Each type tends to need a slightly different implementation
• Let's not have too many templates.

  Author:

  Tim Cootes

Definition in file vil3d_gauss_reduce.h.

---

Define Documentation

#define VIL3D_GAUSS_REDUCE_INSTANTIATE

(

T

)

extern "please include vil3d/vil3d_gauss_reduce.txx instead"

Definition at line 67 of file vil3d_gauss_reduce.h.

---

Function Documentation

template<class T >

void vil3d_gauss_reduce	(	const vil3d_image_view< T > &	src_im,
		vil3d_image_view< T > &	dest_im,
		vil3d_image_view< T > &	work_im1,
		vil3d_image_view< T > &	work_im2
	)

Smooth and subsample src_im to produce dest_im.

Applies filter in i,j and k directions, then samples every other pixel. Resulting image is (ni+1)/2 x (nj+1)/2 x (nk+1)/2. An image can be reduced in-place, by having src_im and dest_im pointing to the same image.

Applies filter in i,j and k directions, then samples every other pixel. Resulting image is (ni+1)/2 x (nj+1)/2 x (nk+1)/2

Definition at line 47 of file vil3d_gauss_reduce.txx.

template<class T >

void vil3d_gauss_reduce_i	(	const T *	src_im,
		unsigned	src_ni,
		unsigned	src_nj,
		unsigned	src_nk,
		vcl_ptrdiff_t	s_i_step,
		vcl_ptrdiff_t	s_j_step,
		vcl_ptrdiff_t	s_k_step,
		T *	dest_im,
		vcl_ptrdiff_t	d_i_step,
		vcl_ptrdiff_t	d_j_step,
		vcl_ptrdiff_t	d_k_step
	)

Smooth and subsample single plane src_im in i to produce dest_im.

Applies 1-5-8-5-1 filter in i, then samples every other pixel. Fills [0,(ni+1)/2-1][0,nj-1][0,nk-1] elements of dest Assumes dest_im has sufficient data allocated.

By applying three times we can obtain a full gaussian smoothed and sub-sampled 3D image

Definition at line 25 of file vil3d_gauss_reduce.txx.

template<class T >

void vil3d_gauss_reduce_ij	(	const vil3d_image_view< T > &	src_im,
		vil3d_image_view< T > &	dest_im,
		vil3d_image_view< T > &	work_im1
	)

Smooth and subsample src_im along i and j to produce dest_im.

Applies filter in i,j directions, then samples every other pixel. Resulting image is (ni+1)/2 x (nj+1)/2 x nk

Definition at line 101 of file vil3d_gauss_reduce.txx.

template<class T >

void vil3d_gauss_reduce_ik	(	const vil3d_image_view< T > &	src_im,
		vil3d_image_view< T > &	dest_im,
		vil3d_image_view< T > &	work_im1
	)

Smooth and subsample src_im along i and k to produce dest_im.

Applies filter in i,k directions, then samples every other pixel. Resulting image is (ni+1)/2 x nj x (nk+1)/2

Definition at line 141 of file vil3d_gauss_reduce.txx.

template<class T >

void vil3d_gauss_reduce_jk	(	const vil3d_image_view< T > &	src_im,
		vil3d_image_view< T > &	dest_im,
		vil3d_image_view< T > &	work_im1
	)

Smooth and subsample src_im along j and k to produce dest_im.

Applies filter in j,k directions, then samples every other pixel. Resulting image is ni x (nj+1)/2 x (nk+1)/2

Definition at line 181 of file vil3d_gauss_reduce.txx.