Video picture compression

Details Video picture compression Video picture compression

1977-05-19

1979-05-01

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

041527194

ABSTRACT:
A video compressor including an analogue to digital converter for sampling an incoming video signal, a store for holding the sampled signal and a digital to analogue converter for reconverting the stored signal into analogue form.
A processor is provided for processing the video signal prior to conversion and storage. The processor includes means for reducing the frequency of a line locked sub-carrier waveform and means for maintaining the correct subcarrier line to line phasing whereby when predetermined ones of the samples are retained by the store, a compressed picture having correct phase and subcarrier relationships is provided.

REFERENCES:
bruch, "Transcoder PAL-NTSC . . . ", Telefunken-Zeitung, Jg. 37 (1964), Heft 2, pp. 115 and 131.

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