Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-12-23
1991-03-19
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
352135, 352136, H04N 712
Patent
active
050015605
ABSTRACT:
A method and apparatus for decoding and receiving a sequence of image frames employ selectively a measure of motion displacement for generating a motion compensated image and filter selection data. The motion compensated image, together with an error signal, provides the receiver with full detail regarding the next frame of a sequence. In some instances, however, the motion displacement data is inaccurate for portions of the next image frame. In those instances, the method and apparatus determine from the filter selection data that filtering of a portion of a previously received image provides a lower error energy for the resulting prediction of the image. If a lower error energy is not achieved by low-pass filtering, the data from the communications path regarding the motion displacement enables the receiver to reconstruct at least a block portion of the image frame.
REFERENCES:
patent: 4628344 (1986-12-01), Glenn
patent: 4692801 (1987-09-01), Ninomiya et al.
patent: 4811092 (1989-03-01), Achiha et al.
patent: 4858026 (1989-08-01), Richards
Groody James J.
Kostak Victor R.
PicTel Corporation
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