System for the compatible processing of a progressively scanned

Details System for the compatible processing of a progressively scanned System for the compatible processing of a progressively scanned

1993-10-22

1995-08-01

Kostak, Victor R.

Television

Bandwidth reduction system

Format type

348913, 348429, H04N 7015

Patent

active

054383684

ABSTRACT:
A system is disclosed for the compatible transmission of a 16:9 progressive scan television signal by means of a letterbox formatted line interlaced signal. The letterbox edge bands contain a vertical helper signal representing the difference between a predicted progressive line and adjacent interlaced lines. Improved resolution of a progressive image at a progressive 16:9 receiver is facilitated by specially arranged half band filters in the transmitter/coder and inverse half band filtering in the receiver. Alternatively, when ordinary low pass filtering is used in the coder prior to interlaced subsampling, the fidelity of a reproduced image is improved using, an approximate simulation of such coder low pass filtering in the decoder together with a correction signal derived therefrom. An image reproduced at the progressive 16:9 receiver can more closely resemble the transmitter source signal by interative processing of the receiver correction signal.

REFERENCES:
patent: 5208670 (1993-05-01), Sugimori et al.
patent: 5227879 (1993-07-01), Mogita et al.

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