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Proceedings Paper

Real-Time Median-Window Filtering Of Video Signals
Author(s): William Swindell; Harrison H. Barrett
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Paper Abstract

Abstract. Several hardware methods for selecting the median value of a set of input signals are described. Two of the systems are based on the use of an analog multiplexer to select the channel containing the median value. The input levels are pairwise compared with comparators, and the comparator outputs provide logic levels to drive the address lines of a multiplexer. A third method involves the use of saturable amplifiers and a summing junction. An interesting feature of this system is that it can act as a median filter, a linear averaging filter, or a combination of the two. A circuit whose output automatically hunts around the median value is described next, and the final circuit relies on diode switching networks in the feedback loop of operational amplifiers to select the median input. Schematic circuits are provided.

Paper Details

Date Published: 27 February 1984
PDF: 6 pages
Proc. SPIE 0373, Transformations in Optical Signal Processing, (27 February 1984); doi: 10.1117/12.934543
Show Author Affiliations
William Swindell, University of Arizona (United States)
Harrison H. Barrett, University of Arizona (United States)

Published in SPIE Proceedings Vol. 0373:
Transformations in Optical Signal Processing
William T. Rhodes; James R. Fienup; Bahaa Saleh, Editor(s)

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