Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1980-09-08
1982-06-15
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 942
Patent
active
043353959
ABSTRACT:
Demodulated luminance (Y) and chrominance (U, V) signals are stored in field stores 1 to m each with line outputs 1 to n. Output lines are formed by summing the producs of the line outputs with weighting coefficients which are specified for each line in the output standards. Separate sets of coefficients for luminance and chrominance are stored in respective memories. The chrominance sets are arranged to reduce the vertical and temporal resolution of the chrominance information. This has the beneficial effect of reducing cross-color interference. In the implementation shown the signals are stored as time multiplexed digital samples YYYUV (i.e. with one pair of chrominance samples to three luminance samples) and the luminance and chrominance coefficient sets for the current output line are stored as a.sub.11 to a.sub.mn and b.sub.11 to b.sub.mn respectively in buffer registers. A switching waveform controls electronic switches to apply a.sub.11 to a.sub.mn to multipliers when Y samples are presented and to apply b.sub.11 to b.sub.mn when U or V samples are presented.
REFERENCES:
patent: 4106053 (1978-08-01), Maxemchuk
patent: 4240101 (1980-12-01), Michael et al.
British Broadcasting Corporation
Murray Richard
O'Connell Robert F.
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