core/vil/vil_sample_grid_bilin.h File Reference

Bilinear grid sampling function for 2D images. More...

#include <vil/vil_image_view.h>

Go to the source code of this file.

Functions
template<class imType , class vecType >
void	vil_sample_grid_bilin (vecType *v, const vil_image_view< imType > &image, double x0, double y0, double dx1, double dy1, double dx2, double dy2, int n1, int n2)
	Sample grid from image, using bilinear interpolation.
template<class imType , class vecType >
void	vil_sample_grid_bilin_edgena (vecType *v, const vil_image_view< imType > &image, double x0, double y0, double dx1, double dy1, double dx2, double dy2, int n1, int n2)
	Sample grid from image, using bilinear interpolation.

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Detailed Description

Bilinear grid sampling function for 2D images.

Author:

Tim Cootes

The vil bicub source files were derived from the corresponding vil bilin files, thus the vil bilin/bicub source files are very similar. If you modify something in this file, there is a corresponding bicub file that would likely also benefit from the same change.

Definition in file vil_sample_grid_bilin.h.

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Function Documentation

template<class imType , class vecType >

void vil_sample_grid_bilin	(	vecType *	v,
		const vil_image_view< imType > &	image,
		double	x0,
		double	y0,
		double	dx1,
		double	dy1,
		double	dx2,
		double	dy2,
		int	n1,
		int	n2
	)

Sample grid from image, using bilinear interpolation.

Grid points are (x0+i.dx1+j.dx2,y0+i.dy1+j.dy2), where i=[0..n1-1], j=[0..n2-1] Vector v is filled with n1*n2*np elements, where np=image.nplanes()*image.ncomponents() v[0]..v[np-1] are the values from point (x0,y0) Samples are taken along direction (dx2,dy2) first, then along (dx1,dy1). Points outside image return zero.

Sample grid from image, using bilinear interpolation.

Profile points are along the line between p0 and p1 (in image co-ordinates). Vector v is resized to n*np elements, where np=image.n_planes(). v[0]..v[np-1] are the values from point p Points outside image return zero.

Definition at line 34 of file vil_sample_grid_bilin.txx.

template<class imType , class vecType >

void vil_sample_grid_bilin_edgena	(	vecType *	v,
		const vil_image_view< imType > &	image,
		double	x0,
		double	y0,
		double	dx1,
		double	dy1,
		double	dx2,
		double	dy2,
		int	n1,
		int	n2
	)

Sample grid from image, using bilinear interpolation.

Grid points are (x0+i.dx1+j.dx2,y0+i.dy1+j.dy2), where i=[0..n1-1], j=[0..n2-1] Vector v is filled with n1*n2*np elements, where np=image.nplanes()*image.ncomponents() v[0]..v[np-1] are the values from point (x0,y0) Samples are taken along direction (dx2,dy2) first, then along (dx1,dy1). Points outside image return NA.

Sample grid from image, using bilinear interpolation.

Profile points are along the line between p0 and p1 (in image co-ordinates). Vector v is resized to n*np elements, where np=image.n_planes(). v[0]..v[np-1] are the values from point p Points outside image return NA.

Definition at line 115 of file vil_sample_grid_bilin.txx.