vil_gauss_reduce.txx File Reference

---

Detailed Description

Functions to smooth and sub-sample image in one direction.

Author:

Tim Cootes

Definition in file vil_gauss_reduce.txx.

#include "vil_gauss_reduce.h"
#include <vcl_cassert.h>
#include <vil/vil_bilin_interp.h>
#include <vil/vil_plane.h>
#include <vil/vil_convert.h>

Go to the source code of this file.

Defines
#define	VIL_GAUSS_REDUCE_INSTANTIATE(T)
Functions
template<class T>
void	vil_gauss_reduce (const vil_image_view< T > &src_im, vil_image_view< T > &dest_im, vil_image_view< T > &work_im)
	Smooth and subsample src_im to produce dest_im.
template<class T>
void	vil_gauss_reduce_2_3 (const vil_image_view< T > &src_im, vil_image_view< T > &dest_im, vil_image_view< T > &work_im)
	Smooth and subsample src_im to produce dest_im (2/3 size).
template<class T>
void	vil_gauss_reduce_121 (const vil_image_view< T > &src_im, vil_image_view< T > &dest_im)
	Smooth and subsample src_im to produce dest_im.
unsigned char	l_round (double x, unsigned char)
	An optimisable rounding function.
signed char	l_round (double x, signed char)
double	l_round (double x, double)
float	l_round (double x, float)
template<class T>
void	vil_gauss_reduce_general_plane (const vil_image_view< T > &src, vil_image_view< T > &dest, vil_image_view< T > &worka, vil_image_view< T > &workb, const vil_gauss_reduce_params &params)
	Smooth and subsample src_im to produce dest_im.
template<class T>
void	vil_gauss_reduce_general (const vil_image_view< T > &src, vil_image_view< T > &dest, vil_image_view< T > &worka, vil_image_view< T > &workb, const vil_gauss_reduce_params &params)
	Smooth and subsample src_im by an arbitrary factor to produce dest_im.
template<class T>
void	vil_gauss_reduce_1plane (const T *src_im, unsigned src_ni, unsigned src_nj, vcl_ptrdiff_t s_x_step, vcl_ptrdiff_t s_y_step, T *dest_im, vcl_ptrdiff_t d_x_step, vcl_ptrdiff_t d_y_step)
	Smooth and subsample single plane src_im in x to produce dest_im.
template<class T>
void	vil_gauss_reduce_121_1plane (const T *src_im, unsigned src_ni, unsigned src_nj, vcl_ptrdiff_t s_x_step, vcl_ptrdiff_t s_y_step, T *dest_im, vcl_ptrdiff_t d_x_step, vcl_ptrdiff_t d_y_step)
	Smooth and subsample single plane src_im in x to produce dest_im using 121 filter in x and y.
template<class T>
void	vil_gauss_reduce_2_3_1plane (const T *src_im, unsigned src_ni, unsigned src_nj, vcl_ptrdiff_t s_x_step, vcl_ptrdiff_t s_y_step, T *dest_im, vcl_ptrdiff_t d_x_step, vcl_ptrdiff_t d_y_step)
	Smooth and subsample single plane src_im in x, result is 2/3rd size.

---

Define Documentation

#define VIL_GAUSS_REDUCE_INSTANTIATE (  T   )

Value: template void vil_gauss_reduce(const vil_image_view<T >& src, \ vil_image_view<T >& dest, \ vil_image_view<T >& work_im); \ template void vil_gauss_reduce_2_3(const vil_image_view<T >& src, \ vil_image_view<T >& dest, \ vil_image_view<T >& work_im); \ template void vil_gauss_reduce_121(const vil_image_view<T >& src, \ vil_image_view<T >& dest); \ template void vil_gauss_reduce_general(const vil_image_view<T >& src_im, \ vil_image_view<T >& dest_im, \ vil_image_view<T >& worka, \ vil_image_view<T >& workb, \ const vil_gauss_reduce_params& params) Definition at line 463 of file vil_gauss_reduce.txx.

---

Function Documentation

float l_round (  double  x, float  )  [inline]

Definition at line 147 of file vil_gauss_reduce.txx.

double l_round (  double  x, double  )  [inline]

Definition at line 144 of file vil_gauss_reduce.txx.

signed char l_round (  double  x, signed  char )  [inline]

Definition at line 123 of file vil_gauss_reduce.txx.

unsigned char l_round (  double  x, unsigned  char )  [inline]

An optimisable rounding function. Definition at line 120 of file vil_gauss_reduce.txx.

template<class T> void vil_gauss_reduce (  const vil_image_view< T > &  src_im, vil_image_view< T > &  dest_im, vil_image_view< T > &  work_im )  [related]

Smooth and subsample src_im to produce dest_im. Applies filter in x and y, then samples every other pixel. work_im provides workspace Definition at line 19 of file vil_gauss_reduce.txx.

template<class T> void vil_gauss_reduce_121 (  const vil_image_view< T > &  src_im, vil_image_view< T > &  dest_im )  [related]

Smooth and subsample src_im to produce dest_im. Applies filter in x and y, then samples every other pixel. Definition at line 94 of file vil_gauss_reduce.txx.

template<class T> void vil_gauss_reduce_121_1plane (  const T *  src_im, unsigned  src_ni, unsigned  src_nj, vcl_ptrdiff_t  s_x_step, vcl_ptrdiff_t  s_y_step, T *  dest_im, vcl_ptrdiff_t  d_x_step, vcl_ptrdiff_t  d_y_step )

Smooth and subsample single plane src_im in x to produce dest_im using 121 filter in x and y. Smoothes with a 3x3 filter and subsamples Definition at line 328 of file vil_gauss_reduce.txx.

template<class T> void vil_gauss_reduce_1plane (  const T *  src_im, unsigned  src_nx, unsigned  src_ny, vcl_ptrdiff_t  s_x_step, vcl_ptrdiff_t  s_y_step, T *  dest_im, vcl_ptrdiff_t  d_x_step, vcl_ptrdiff_t  d_y_step )

Smooth and subsample single plane src_im in x to produce dest_im. Applies 1-5-8-5-1 filter in x, then samples every other pixel. Fills [0,(nx+1)/2-1][0,ny-1] elements of dest Assumes dest_im has sufficient data allocated. This is essentially a utility function, used by mil_gauss_pyramid_builder By applying twice we can obtain a full gaussian smoothed and sub-sampled 2D image. Definition at line 281 of file vil_gauss_reduce.txx.

template<class T> void vil_gauss_reduce_2_3 (  const vil_image_view< T > &  src_im, vil_image_view< T > &  dest_im, vil_image_view< T > &  work_im )  [related]

Smooth and subsample src_im to produce dest_im (2/3 size). Applies filter in x and y, then samples every other pixel. work_im provides workspace Definition at line 57 of file vil_gauss_reduce.txx.

template<class T> void vil_gauss_reduce_2_3_1plane (  const T *  src_im, unsigned  src_ni, unsigned  src_nj, vcl_ptrdiff_t  s_x_step, vcl_ptrdiff_t  s_y_step, T *  dest_im, vcl_ptrdiff_t  d_x_step, vcl_ptrdiff_t  d_y_step )

Smooth and subsample single plane src_im in x, result is 2/3rd size. Applies alternate 1-3-1, 1-1 filter in x, then samples every other pixel. Fills [0,(2*ni+1)/3-1][0,nj-1] elements of dest Note, 131 filter only an approximation Definition at line 407 of file vil_gauss_reduce.txx.

template<class T> void vil_gauss_reduce_general (  const vil_image_view< T > &  src_im, vil_image_view< T > &  dest_im, vil_image_view< T > &  worka, vil_image_view< T > &  workb, const vil_gauss_reduce_params &  params )

Smooth and subsample src_im by an arbitrary factor to produce dest_im. Parameters: worka  provide workspace to avoid repetitive memory alloc and free workb  provide workspace to avoid repetitive memory alloc and free Definition at line 252 of file vil_gauss_reduce.txx.

template<class T> void vil_gauss_reduce_general_plane (  const vil_image_view< T > &  src, vil_image_view< T > &  dest, vil_image_view< T > &  worka, vil_image_view< T > &  workb, const vil_gauss_reduce_params &  params )

Smooth and subsample src_im to produce dest_im. Applies 5 pin filter in x and y, then samples every other pixel. Assumes dest_im has sufficient data allocated Definition at line 157 of file vil_gauss_reduce.txx.

---