Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-05-31
1986-02-25
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358167, 358 37, 358166, H04N 964
Patent
active
045730709
ABSTRACT:
Noise reduction on a video signal is achieved by an adaptive filter system which is capable of automatic changes in filter parameters. This inventive concept includes an automatic method of independently changing both the width and center frequency of the teeth of a comb type bandpass envelope of the filter, as well as adjusting the amplitude response of the filter, independent of the bandpass characteristics, in order to closely match the filter bandpass response to the power spectrum of the video signal being processed, thus rejecting noise in those portions of the spectrum not being used by the video signal. The filter system herein disclosed also provides an adaptive spatial processing of the video signal thus further improving said signal by enhancing detail in the image and by smoothing low amplitude noise in relatively detail free areas of the picture.
REFERENCES:
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patent: 4050084 (1977-09-01), Rossi
patent: 4058836 (1977-11-01), Drewery
patent: 4064530 (1977-12-01), Kaiser
patent: 4072984 (1978-02-01), Kaiser
patent: 4090221 (1978-05-01), Connor
patent: 4107736 (1978-08-01), Lowry
patent: 4107739 (1978-08-01), Rossi
patent: 4194219 (1980-03-01), Drewery
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A Digital Noise Reducer for Encoded NTSC Signals, by R. H. McMann, S. Kreinik, J. K. Moore, A. Kaiser and J. Rossi--1977, Digital Video.
Comb Filter Improvement with Spurious Chroma Deletion, by Arthur Kaiser, Jan. 1977, SMPTE Journal, vol. 86, No. 1.
Theoretical Improvement in Signal to Noise Ratio of Television Signals by Equivalent Comb Filter Technique, by Murray J. Stateman and Murray B. Ritterman of Sylvania Electric Products, Inc.
Recent Advances in the Synthesis of Comb Filters, by Warren D. White and A. E. Ruvin of Airborne Instruments Laboratory, Inc.
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