Dilation algorithm for a linear quadtree
Image and Vision Computing
Algorithm to expand regions represented by linear quadtrees
Image and Vision Computing
Analysis and applications of hierarchical data structures
Analysis and applications of hierarchical data structures
Applications of spatial data structures: Computer graphics, image processing, and GIS
Applications of spatial data structures: Computer graphics, image processing, and GIS
The design and analysis of spatial data structures
The design and analysis of spatial data structures
An effective way to represent quadtrees
Communications of the ACM
Digital Picture Processing
Efficient computation and data structures for graphics.
Efficient computation and data structures for graphics.
Efficient Regular Data Structures and Algorithms for Location and Proximity Problems
FOCS '99 Proceedings of the 40th Annual Symposium on Foundations of Computer Science
Database and Representation Issues in Geographic Information Systems (GIS)
W2GIS '09 Proceedings of the 9th International Symposium on Web and Wireless Geographical Information Systems
Multidimensional data structures for spatial applications
Algorithms and theory of computation handbook
GbRPR'05 Proceedings of the 5th IAPR international conference on Graph-Based Representations in Pattern Recognition
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A one-pass algorithm that performs region expansion in images represented by quadtrees is presented. The algorithm changes to black those white pixels within a specified distance of any black mode in the image. The algorithm yields a significant improvement over previous approaches by reducing both the number of black nodes that must be considered for expansion and the number of nodes that must be inserted as a result of the expansion. The reductions are achieved by introducing the concepts of a merging cluster and a vertex set. Empirical tests show that the execution time of this algorithm generally decreases as the radius of expansion increases, whereas in previous approaches the execution time generally increased with the radius of expansion.