Location: MATH 1311
Time: 2:00 PM
Day: Tuesday
Organizers:
Enrico Au-Yeung enrico(a)math(.)umd(.)edu
Ben Lauser blauser(a)math(.)umd(.)edu Nate Strawn nstr@wn(a)m@th

Related Seminars:

• Center for Scientific Computation and Mathematical Modeling
• Signals and Information Group
• Information and Coding Theory
• Communication and Signal Processing Laboratory
• SIAM Washington-Baltimore Section
• Neuroscience and Cognitive Science Program

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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