The Norbert Wiener Center Seminar
UPCOMING TALK
Title: Fast multiscale edge-detection in medical ultrasound signals
Speaker: Preben Nas
ROOM: Math Building, Room 1311
Contact:
Abstract
The topic for the presentation is a fast space-scale filtering procedure and
edge-detection algorithm for medical ultrasound signals. The edge-detector
both detects and determines the precise location of major edges in such
signals, without corrupting the representation with redundant information.
It is well-known that the continuous wavelet-transform and its maxima-lines
effectively can be used to detect edges in noisy signals. Maxima-lines are
obtained by computing the wavelet-transform at several close scales.
However to reduce computational complexity and save time we suggest a
time-scale filtering procedure which uses only a few distinct scales. The
construction of the procedure is based on a study of maxima-lines
corresponding to edges typical for medical ultrasound signals. This allows
us to meet the demand of speed, but not on the expense of reliability.
The connection-procedure has been applied together with an edge-detector on
several medical ultrasound signals. Our results show that we achieve good
separation between noise and major edges in such signals.
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