contrib/brl/bseg/sdet/sdet_region_edge.h File Reference

An edge with extract information to support constructing regions from an edgel segmentation. More...

#include <vtol/vtol_edge_2d.h>
#include <vtol/vtol_edge_2d_sptr.h>
#include <vbl/vbl_ref_count.h>
#include <vcl_stlfwd.h>
#include "sdet_region_edge_sptr.h"

Go to the source code of this file.

Classes
class	sdet_region_edge

---

Detailed Description

An edge with extract information to support constructing regions from an edgel segmentation.

This class supports tracing of region boundaries in conjunction with the class EdgelIntensity. The sdet_region_edge maintains a list of region labels which the edge is adjacent to. Ideally, the edge is adjacent to only two regions, left and right, as shown below.

                      left_region_
             V1------------------------V2
                      right_region_
   

In practice, this restriction is too limiting. It is possible for an edge to be adjacent to more than two regions. For example:

      c c c
     o----\ c
    E  b b  \ c
     o------+ \ c
      c c c | a \ c
          c +----+ c
            c c c c
   

Note that edge E is adjacent to both regions a and b even though there is no intervening vertex at the transition between a and b. In order to preserve a separation between regions b and c, it is necessary to allow more than two labels (a,b) for a given edge.

Author:

J. L. Mundy - January 24, 1999

    Modifications
     Feb 10, 1999  - JLM Extended the concept of a sdet_region_edge
                         to represent a vertex, where the edge is NULL.
                         This extension permits the propagation of region labels
                         across junctions.
     March 7, 1999 - JLM Allowed more than two regions per edge.
     Sept 10, 2004 - PVr Added copy ctor with explicit vbl_ref_count init
   

Definition in file sdet_region_edge.h.