vil_line_filter< Type > Class Template Reference

Find line-like structures in a 2D image. More...

#include <vil_line_filter.h>

Public Member Functions
void	light_lines_3x3 (vil_image_view< vxl_byte > &line_dir, vil_image_view< float > &line_str, const vil_image_view< Type > &image, float edge_thresh=0.1f)
	Find line like structures in image (light lines on dark backgrounds). More...
void	dark_lines_3x3 (vil_image_view< vxl_byte > &line_dir, vil_image_view< float > &line_str, const vil_image_view< Type > &image, float edge_thresh=0.1f)
	Find line like structures in image (dark lines on light backgrounds). More...
void	light_lines_5x5 (vil_image_view< vxl_byte > &line_dir, vil_image_view< float > &line_str, const vil_image_view< Type > &image, float edge_thresh=0.1f)
	Find line like structures in image (light lines on dark backgrounds). More...
void	dark_lines_5x5 (vil_image_view< vxl_byte > &line_dir, vil_image_view< float > &line_str, const vil_image_view< Type > &image, float edge_thresh=0.1f)
	Find line like structures in image (dark lines on light backgrounds). More...

Detailed Description

template<class Type>
class vil_line_filter< Type >

Find line-like structures in a 2D image.

Generates two images: line_str contains line strength at each pixel, essentially the difference between the average of the pixels on the line and the average of those nearby off the line. and line_dir contains value indicating direction [0,4] 0 = Undefined, 1 = horizontal, 2 = 45 degrees etc

Definition at line 19 of file vil_line_filter.h.

Member Function Documentation

dark_lines_3x3()

template<class Type >

void vil_line_filter< Type >::dark_lines_3x3	(	vil_image_view< vxl_byte > &	line_dir,
		vil_image_view< float > &	line_str,
		const vil_image_view< Type > &	image,
		float	edge_thresh = 0.1f
	)

Find line like structures in image (dark lines on light backgrounds).

Find line like structures in image (dark lines on bright backgrounds).

On exit line_str contains line strength at each pixel, line_dir contains value indicating direction [0,4] 0 = Undefined, 1 = horizontal, 2 = 45 degrees etc This version looks for dark lines on a light background only.

On exit line_str contains line strength at each pixel, line_dir contains value indicating direction [0,4] 0 = Undefined, 1 = horizontal, 2 = 45 degrees etc

Definition at line 115 of file vil_line_filter.hxx.

dark_lines_5x5()

template<class Type >

void vil_line_filter< Type >::dark_lines_5x5	(	vil_image_view< vxl_byte > &	line_dir,
		vil_image_view< float > &	line_str,
		const vil_image_view< Type > &	image,
		float	edge_thresh = 0.1f
	)

Find line like structures in image (dark lines on light backgrounds).

On exit line_str contains line strength at each pixel, line_dir contains value indicating direction [0,4] 0 = Undefined, 1 = horizontal, 2 = 45 degrees etc This version looks for dark lines on a light background only using a 5x5 filter

Definition at line 317 of file vil_line_filter.hxx.

light_lines_3x3()

template<class Type >

void vil_line_filter< Type >::light_lines_3x3	(	vil_image_view< vxl_byte > &	line_dir,
		vil_image_view< float > &	line_str,
		const vil_image_view< Type > &	image,
		float	edge_thresh = 0.1f
	)

Find line like structures in image (light lines on dark backgrounds).

On exit line_str contains line strength at each pixel, line_dir contains value indicating direction [0,4] 0 = Undefined, 1 = horizontal, 2 = 45 degrees etc This version looks for light lines on a dark background only.

Definition at line 22 of file vil_line_filter.hxx.

light_lines_5x5()

template<class Type >

void vil_line_filter< Type >::light_lines_5x5	(	vil_image_view< vxl_byte > &	line_dir,
		vil_image_view< float > &	line_str,
		const vil_image_view< Type > &	image,
		float	edge_thresh = 0.1f
	)

Find line like structures in image (light lines on dark backgrounds).

On exit line_str contains line strength at each pixel, line_dir contains value indicating direction [0,4] 0 = Undefined, 1 = horizontal, 2 = 45 degrees etc This version looks for light lines on a dark background only using a 5x5 filter

On exit line_str contains line strength at each pixel, line_dir contains value indicating direction [0,4] 0 = Undefined, 1 = horizontal, 2 = 45 degrees etc This version looks for light lines on a dark background only.

Definition at line 209 of file vil_line_filter.hxx.

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The documentation for this class was generated from the following files:

• core/vil/algo/vil_line_filter.h
• core/vil/algo/vil_line_filter.hxx