Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-05-17
1991-04-23
Brittion, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, H04N 7133
Patent
active
050104020
ABSTRACT:
A video signal compression apparatus in which a video signal having a non-matrix pixel arrangement is separated into a plurality of partial images each having a matrix pixel arrangement. The partial images thus separated are interpolated into those containing low-frequency components and those having high-frequency components. The partial images having low-frequency components are coded by an orthogonal transformation while those having high-frequency components are coded by a non-linear quantization or orthogonal transformation. The amount of data is adaptively assigned from the code length of the partial images having high-frequency components to those having low-frequency components, thus effectively utilizing the orthogonal transormation coding which has a great compression effect on a video signal having a non-matrix pixel arrangement. Further, by virtue of a comparatively small amount of data for the signal of high frequency region, the signal of low frequency region having a comparatively great amount of information can be assigned with a greater amount of data thereby to improve the compression efficiency.
REFERENCES:
patent: 4302775 (1981-11-01), Widergren
patent: 4965667 (1990-10-01), Trew
Brittion Howard W.
Matsushita Electric - Industrial Co., Ltd.
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