Bell Communications Research, Inc.

Fure-Ching Jeng

Didier J LeGall

A preprocessing method and circuit is utilized to convert a video sequence between a high resolution interlaced format used when the video sequence is read out of a storage medium and a low resolution progressive format suitable for compression encoding at a low bit rate. In accordance with the inventive format conversion preprocessing algorithm, the video sequence in the high resolution interlaced format is first processed by a linear filter with a diamond-shaped passband in y-t space. The output of the linear filter is processed by a non-linear filter and the resulting signal is then decimated to produce the video signal in the low resolution progressive format. The inventive preprocessing algorithm serves to eliminate aliasing, noise, and jerkiness of motion from the sequence in the low resolution progressive format.

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Belle Mead, NJ, United States of America

Fure-Ching Jeng