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A fast algorithm for level set-like active contours
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DOI：10.1016/S0167-8655(02)00374-4.png)
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This paper describes a fast algorithm for topology independent tracking of moving interfaces under curvature- and velocity field-dependent speed laws. This is usually done in the level set framework using the narrow-band algorithm, which accurately solves the level set equation but is too slow to use in real-time or near real-time image segmentation applications. In this paper we introduce a fast algorithm for tracking moving interfaces in a level set-like manner. The algorithm relies on two key components: First, it tracks the interface by scheduling point-wise propagation events using a heap sorted queue. Second, the local geometric properties of the interface are defined so that they can be efficiently updated in an incremental manner and so that they do not require the presence of the signed distance function. Finally examples are given that indicate that the algorithm is fast and accurate enough for near real-time segmentation applications. (C) 2002 Elsevier Science B.V. All rights reserved.
Keyword:
level set methods
active contours
image segmentation
medical image processing
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