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details Edgel Class Reference VIGRA

#include "vigra/edgedetection.hxx"


Public Attributes

float x
float y
float strength
float orientation


Detailed Description


Helper class that stores edgel attributes.


Member Data Documentation


float orientation

 

The edgel's orientation. This is the angle between the x-axis and the edge, so that the bright side of the edge is on the right. The angle is measured counter-clockwise in radians like this:

  edgel axis
      \  (bright side)
 (dark \
 side)  \ /__ 
         \\  \ orientation angle
          \  |
           +------------> x-axis
           |
           |
           |
           |
    y-axis V

So, for example a vertical edge with its dark side on the left has orientation PI/2, and a horizontal edge with dark side on top has orientation 0. Obviously, the edge's orientation changes by PI if the contrast is reversed.


float strength

 

The edgel's strength (magnitude of the gradient vector).


float x

 

The edgel's sub-pixel x coordinate.


float y

 

The edgel's sub-pixel y coordinate.


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

© Ullrich Köthe (koethe@informatik.uni-hamburg.de)
Cognitive Systems Group, University of Hamburg, Germany

html generated using doxygen and Python
VIGRA 1.2.0 (7 Aug 2003)