Extended algorithm to construct a quadtree from Freeman chain code in four directions

Image Analysis and Stereology

Eva Zupančič¹  Andrej Nerat¹  Borut Žalik¹  Damjan Strnad¹ 

[1] University of Maribor,Faculty of Electrical Engineering and Computer Science;

关键词: chain code;    quadtree;    chain code to quadtree conversion;    space filling curve;    z-order curve;   

DOI  :  10.5566/ias.2095

来源: DOAJ

【 摘 要 】

This paper introduces improvements to the algorithm that was proposed in 2001 by Chen and Chen. The algorithm constructs a quadtree directly from Freeman chain code in four directions. We have improved the algorithm in two ways: Firstly, a time efficient solution using the space filling Z-order curve is proposed for a self-intersection case that was not considered by Chen and Chen. Secondly, the algorithm is expanded to handle geometric objects containing holes. The computational efficiency of the extended algorithm was confirmed by the experiments.

【 授权许可】

Unknown