Chapter04 Representation & Description.ppt

chain codes
Chapter 4
Representation & Description
Chain codes are used to represent a boundary by a connected sequence of straight-line segments of specified length and direction. Typically, this representation is based on 4- and 8-connectivity of the segments.
Chapter 4
Representation & Description
Polygonal approximations
Signature
There are three types of polygonal approximations:
Minimum perimeter polygons
Merging techniques
Splitting techniques
Signatures are 1-D functional description of a boundary and may be generated in various ways. One of the simplest is to plot the distance from the centroid to the boundary as a function of angle.
Chapter 4
Representation & Description
Chapter 4
Representation & Description
Euler number
E=C-H
Where H is the number of holes and C is the ponents i