Format conversion preprocessing method and circuit

Details Format conversion preprocessing method and circuit Format conversion preprocessing method and circuit

1990-10-03

1991-09-17

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358138, H04N 701

Patent

active

050499939

ABSTRACT:
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.

REFERENCES:
patent: 4621286 (1986-11-01), Reitmeier
patent: 4829367 (1989-05-01), Dubois
patent: 4829378 (1989-05-01), LeGall
"Description of Reference Model 8 (RM8)", Document 525, CCITT SG XV, Working Party XV/4 Specialist Group for Visual Telephony, 1989.

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