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2009
Springer

Optimal Combination of SOM Search in Best-Matching Units and Map Neighborhood

9 years 11 months ago
Optimal Combination of SOM Search in Best-Matching Units and Map Neighborhood
Abstract. The distribution of a class of objects, such as images depicting a specific topic, can be studied by observing the best-matching units (BMUs) of the objects’ feature vectors on a Self-Organizing Map (SOM). When the BMU “hits” on the map are summed up, the class distribution may be seen as a two-dimensional histogram or discrete probability density. Due to the SOM’s topology preserving property, one is motivated to smooth the value field and spread out the values spatially to neighboring units, from where one may expect to find further similar objects. In this paper we study the impact of using more map units than just the single BMU of each feature vector in modeling the class distribution. We demonstrate that by varying the number of units selected in this way and varying the width of the spatial convolution one can find an optimal combination which maximizes the class detection performance.
Mats Sjöberg, Jorma Laaksonen
Added 27 Jul 2010
Updated 27 Jul 2010
Type Conference
Year 2009
Where WSOM
Authors Mats Sjöberg, Jorma Laaksonen
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