core/vil/algo/vil_blob.cxx File Reference

Finds connected regions in a boolean image. More...

#include "vil_blob.h"
#include <vcl_algorithm.h>
#include <vcl_cassert.h>

Go to the source code of this file.

Functions
void	vil_blob_labels (const vil_image_view< bool > &src_binary, vil_blob_connectivity conn, vil_image_view< unsigned > &dest_label)
	Produce a label image that enumerates all disjoint blobs in a binary image.
void	vil_blob_labels_to_edge_labels (const vil_image_view< unsigned > &src_label, vil_blob_connectivity conn, vil_image_view< unsigned > &dest_label)
	Set all non-blob-edge pixels in a blob label image to zero.
void	vil_blob_labels_to_regions (const vil_image_view< unsigned > &src_label, vcl_vector< vil_blob_region > &dest_regions)
	Convert a label image into a list of chorded regions.
void	vil_blob_labels_to_pixel_lists (const vil_image_view< unsigned > &src_label, vcl_vector< vil_blob_pixel_list > &dest_pixel_lists)
	Convert a label image (or an edge label image) into a set of pixel lists.

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Detailed Description

Finds connected regions in a boolean image.

Author:

Ian Scott

Definition in file vil_blob.cxx.

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Function Documentation

void vil_blob_labels	(	const vil_image_view< bool > &	src_binary,
		vil_blob_connectivity	conn,
		vil_image_view< unsigned > &	dest_label
	)

Produce a label image that enumerates all disjoint blobs in a binary image.

Definition at line 81 of file vil_blob.cxx.

void vil_blob_labels_to_edge_labels	(	const vil_image_view< unsigned > &	src_label,
		vil_blob_connectivity	conn,
		vil_image_view< unsigned > &	dest_label
	)

Set all non-blob-edge pixels in a blob label image to zero.

A 4-conn edge is a 4-conn area itself, and not just those pixels which have dissimilar 4-conn neighbours.

Definition at line 197 of file vil_blob.cxx.

void vil_blob_labels_to_pixel_lists	(	const vil_image_view< unsigned > &	src_label,
		vcl_vector< vil_blob_pixel_list > &	dest_pixel_lists
	)

Convert a label image (or an edge label image) into a set of pixel lists.

Convert a label image into a list of pixel lists.

A blob label value of n will be returned in dest_pixels_lists[n-1]. Note that pixel lists are not ordered.

Definition at line 275 of file vil_blob.cxx.

void vil_blob_labels_to_regions	(	const vil_image_view< unsigned > &	src_label,
		vcl_vector< vil_blob_region > &	dest_regions
	)

Convert a label image into a list of chorded regions.

A blob label value of n will be returned in dest_regions[n-1].

Definition at line 247 of file vil_blob.cxx.