Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-07-15
1985-03-12
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358147, 358260, 358287, H04N 712
Patent
active
045048606
ABSTRACT:
A method and an apparatus for transmitting an image in which the image is sampled at a first plurality of points. The samples are then subjected to a two-dimensional unitary transform to produce a second plurality of transform coefficients, the second plurality being smaller than the first plurality and being obtained either by selection or truncation of the transform to provide the coefficients containing only the lower frequency components of the image. The transform coefficients are transmitted and on receipt converted by the inverse transform to a second plurality of image samples. Suitable transforms include the Hadamard and the discrete cosine. The image transmission is described as part of a viewdata system.
REFERENCES:
patent: 4179709 (1979-12-01), Workman
patent: 4189748 (1980-02-01), Reis
patent: 4224678 (1980-09-01), Lynch et al.
patent: 4242733 (1980-12-01), Deal
patent: 4242734 (1980-12-01), Deal
patent: 4245330 (1981-01-01), Rebourg
patent: 4261043 (1981-04-01), Robinson et al.
Clarke Roger J.
Fenn Brian A.
Ngan King N.
Nicol Richard C.
British Telecommunications
Coles Edward L.
Martin John C.
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