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Conference paper - Peer-reviewed, 2005

Discrete 3D tools applied to 2D grey-level images

Sanniti Di Baja G, Nyström I, Borgefors G


2D grey-level images are interpreted as 3D binary images, where the grey-level plays the role of the third coordinate. In this way, algorithms devised for 3D binary images can be used to analyse 2D grey-level images. Here, we present three such algorithms. The first algorithm smoothes a 2D grey-level image by flattening its geometrical and grey-level peaks while simultaneously filling in geometrical and grey-level valleys, regarded as non significant in the problem domain. The second algorithm computes an approximation of the convex hull of a 2D grey-level object, by building a covering polyhedron closely fitting the corresponding object in a 3D binary image. The result obtained is convex both from the geometrical point of view and as concerns grey-levels. The third algorithm skeletonizes a 2D grey-level object by skeletonizing the top surface of the object in the corresponding 3D binary image

Published in

Lecture Notes in Computer Science
2005, volume: 3617, pages: 229-236


13th International Conference on Image Analysis and Processing - ICIAP 2005

Authors' information

Borgefors, Gunilla
Swedish University of Agricultural Sciences, Centre for Image Analysis
Sanniti di Baja, Gabriella
Nyström, Ingela

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