||It has been suggested that this article be merged into Morphological skeleton. (Discuss) Proposed since April 2013.|
Let , and consider the eight composite structuring elements, composed by:
- and ,
and the three rotations of each by , , and . The corresponding composite structuring elements are denoted .
For any i between 1 and 8, and any binary image X, define
The thinning of an image A is obtained by cyclically iterating until convergence: