Encoding and decoding of MAC video signals

Details Encoding and decoding of MAC video signals Encoding and decoding of MAC video signals

1991-02-21

1992-03-17

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 11, H04N 712, H04N 920

Patent

active

050973207

ABSTRACT:
A MAC signal encoder, for encoding a video signal into MAC format, includes vertical sub-samplers for vertically sub-sampling color difference signals of the video signal, vertical filters that vertically filter the color difference signals prior to their vertical sub-sampling so as to limit their spectra to a band below the vertical Nyquist frequency of the sub-sampled color difference signals, a multiplexer that multiplexes together the filtered and sub-sampled color difference signals and luminance information of the video signal to produce a signal in MAC format, and a marker detector responsive to the video signal containing marker information indicating that the signal has previously been MAC encoded to inhibit the vertical filtering of the color difference signals by the vertical filters.

REFERENCES:
patent: 4811095 (1989-03-01), Harm
patent: 4908697 (1990-03-01), Tsinberg
patent: 4935813 (1990-06-01), Fonsalas
patent: 4965667 (1990-10-01), Trew et al.
patent: 4994899 (1991-02-01), Rhodes
patent: 5027206 (1991-01-01), Vreeswijk

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