Image signal coder operating at reduced spatial resolution

Details Image signal coder operating at reduced spatial resolution Image signal coder operating at reduced spatial resolution

1995-06-07

1998-12-29

Couso, Yon J.

Image analysis

Image compression or coding

Transform coding

382248, G06K 936

Patent

active

058548580

ABSTRACT:
An image processing system operates at reduced resolution to reduce computational complexity while remaining fully compatible with full resolution decoders. A video input signal is subsampled and encoded at the resulting lower resolution. The encoded signal is filled with zero terms to produce an encoded signal having the same number of terms as a full resolution encoded signal. In a motion-compensated hybrid coder, the decoder section also includes a subsampling system, so that the reconstructed video signal is produced at the same resulting lower resolution. The encoder section and the decoder section are each inverse functions of the other, eliminating a drift problem associated with prior systems.

REFERENCES:
patent: 4553165 (1985-11-01), Bayer
patent: 5089889 (1992-02-01), Sugiyama
patent: 5398078 (1995-03-01), Masuda et al.
patent: 5544091 (1996-08-01), Watanabe
patent: 5552829 (1996-09-01), Kim et al.
patent: 5557330 (1996-09-01), Astle
patent: 5592569 (1997-01-01), Li

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