Edge detection in multispectral images using the self-organizing map

Authors:
P. J. Toivanen;J. Ansamäki;J. P. S. Parkkinen;J. Mielikäinen
Affiliations:
Laboratory of Information Processing, Department of Information Technology, Lappeenrania Univesity of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland;Kouvola Business Department, Kymenlaakso Polytechnic, Salpausseläntie 57, FIN-45100 Kouvola, Finland;Department of Computer Science, University of Joensuu, P.O. Box 111, FIN-80101 Joensuu, Finland;Laboratory of Information Processing, Department of Information Technology, Lappeenrania Univesity of Technology, P.O. Box 20, FIN-53851 Lappeenranta, Finland
Venue:
Pattern Recognition Letters
Year:
2003

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Abstract

In this paper, two new methods for edge detection in multispectral images are presented. They are based on the use of the self-organizing map (SOM) and a grayscale edge detector. With the 2-dimensional SOM the ordering of pixel vectors is obtained by applying the Peano scan, whereas this can be omitted using the 1-dimensional SOM. It is shown that using the R-ordering based methods some parts of the edges may be missed. However, they can be found using the proposed methods. Using them it is also possible to find edges in images which consist of metameric colors. Finally, it is shown that the proposed methods find the edges properly from real multispectral airplane images The size of the SOM determines the amount of found edges. If the SOM is taught using a large color vector database, the same SOM can be utilized for numerous images.