Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-02-21
1993-11-09
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, H04N 712
Patent
active
052607836
ABSTRACT:
A digital video encoder encodes a video frame into a differential video frame for transmission over a packet switched network. The video encoder includes an inter-frame encoder, an intra-frame encoder, and an encoding selector for selecting between the inter-frame and intra-frame encoder depending on the relative motion between the video frame being encoded and the previous video frame.
A composite frame combiner provides a composite intra/inter-frame encoded difference frame having one set of pixels encoded by the inter-frame encoder, and another set of pixels encoded by the intra-frame encoder. The set of intra-frame encoded pixels includes at least one square or rectangular pixel block, a vertical strip of pixel blocks, and a horizontal strip of pixel blocks.
Difference frames are encoded into separable data sets representing video information within a particular range of image resolution. A discrete cosine transform (DCT) is used to transform the difference pixels into corresponding DCT coefficients which are separable, by resolution, into the data sets providing coefficient layers.
A packetizer formats the data sets into asynchronous transfer mode (ATM) packets for transmission over network.
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patent: 4802006 (1989-01-01), Linuma et al.
patent: 4837618 (1989-06-01), Hatarc et al.
patent: 4942465 (1990-07-01), Ohta
Groody James J.
GTE Laboratories Incorporated
Lee Michael H.
Monks Lawrence E.
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