Digital television signal compression apparatus

Facsimile and static presentation processing – Static presentation processing – Attribute control

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358 13, 358137, H04N 1104, H04N 1120

Patent

active

052530418

ABSTRACT:
A preprocessor for conditioning interlace-scan video signals for frame based compression, includes apparatus to accept fields of interlace-scanned video and provide fields of interlace-scanned luminance and chrominance component signals. The fields of interlace-scanned luminance component are combined into respective frames of luminance signal and applied to compressor apparatus for further processing. The fields of interlace scanned chrominance components are independently processed at the field level to generate lines of chrominance values which are interstitial to the lines of the original chrominance values and at a lesser pixel and line density. The independently processed fields of interlace-scanned chrominance signals are combined into respective frames of chrominance component signals and applied to compressor circuitry for further processing. Performing the chrominance signal interpolation and subsampling at the field level tends to eliminate a majority of color distortions around moving images. Receiver apparatus is configured to perform post decompression processing to generate frame data having the original pixel and line density.

REFERENCES:
patent: 5122875 (1992-06-01), Raychaudhuri
patent: 5146325 (1992-09-01), Ng
International Organization for Standardization, ISO-IEC JTC1/SC2/WG11 "Coding of Moving Pictures and Associated Audio," ISO-IEC JTC1/SC2/WG11 MPEG 90/176 Rev. 2, Dec. 18, 1990.
Regis Saint Girons et al., "Proposal Package Description for MPEG Phase 2" Nov. 1991 (This is a communication to the International Organization for Standardization Moving Picture Experts Group).

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