Median Filters - Optical Implementation Using Symbolic Substitution

S. Antony; P. A. Ramamoorthy; T. A. Grogan

doi:10.1117/12.942119

18 January 1988 Median Filters - Optical Implementation Using Symbolic Substitution

S. Antony, P. A. Ramamoorthy, T. A. Grogan

Proceedings Volume 0829, Applications of Digital Image Processing X; (1988) https://doi.org/10.1117/12.942119
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

An optical implementation of median filters for optical digital signal and image processing is proposed. The two properties of median filters, namely, the threshold decomposition and the stacking property are taken advantage of in our design of the median filter. The thresholder decomposes the incoming signal into a set of binary sequences by thresholding the input signal at various thresholding levels. These binary sequences are then applied to a set of binary median filters, the output of which are added together one sample at a time using the summing lens. Data is coded using light polarization and the binary median filters are implemented via symbolic substitution logic (SSL). The optical implementation offers an increased throughput by taking full advantage of the parallelism offered by SSL and the inherent massive parallelism of optics.

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S. Antony, P. A. Ramamoorthy, and T. A. Grogan "Median Filters - Optical Implementation Using Symbolic Substitution", Proc. SPIE 0829, Applications of Digital Image Processing X, (18 January 1988); https://doi.org/10.1117/12.942119

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KEYWORDS

Digital filtering

Binary data

Optical filters

Electronic filtering

Symbolic substitution

Signal processing

Solid state lighting

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