Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1989-04-07
1991-04-09
Chin, Tommy P.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 30, 358 36, H04N 967, H04N 978
Patent
active
050069276
ABSTRACT:
A composite digital video signal encoder comprises crosstalk measuring filters for measuring crosstalk between luminance and chrominance components of a composite digital video signal, a vertical comb filter and a vertical/temporal filter each operative to separate one of the luminance and chrominance components from the composite signal, a mixer for mixing output signals produced by the vertical and vertical/temporal filters, and a mixer control means responsive to the measured crosstalk to control the mixing ratio of the mixer in a sense to reduce cross effects in the mixed output signal resulting from the crosstalk.
REFERENCES:
patent: 4205335 (1980-05-01), Nakagawa
patent: 4870482 (1989-09-01), Yasuki
"The Filtering of Luminance and Chrominance Signals to Avoid Cross-Color in a PAL Color System," J. O. Drewery, BBC Eng., 104/8, Sep. 1976.
"Hardware Investigations into High Quality Digital PAL Decoding and Encoding for the Component Video Environment," D. M. Creed, IBC 1984.
"Improvements to NTSC by Multidimensional Filtering", Dubois, et al., SMPTE Journal, Jun. 1988.
Creed David M.
Lawlor Robert J. D.
Wilkinson James H.
Chin Tommy P.
Frommer William S.
Sinderbrand Alvin
Sony Corporation
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