Truncated run length encoding for fractionally difference modula

Details Truncated run length encoding for fractionally difference modula Truncated run length encoding for fractionally difference modula

1976-12-29

1978-05-30

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

340347DD, H04N 712

Patent

active

040926770

ABSTRACT:
A binary video signal having a raster scan format is fractionally difference modulated to limit the inter-scan line propagation of decoding errors. The fractionally difference modulated video signal is then encoded using different end-of-line message codes to distinguish between unterminated white runs of difference modulated and unmodulated picture elements, thereby providing a scan line-by-scan line indication of whether the picture elements are difference modulated or not and avoiding the need for distinguishing between the difference modulated and unmodulated picture elements while converting black terminated white runs and non-terminating black picture elements into run length message codes and individual message bits, respectively.

REFERENCES:
patent: 3830964 (1974-08-01), Spencer
patent: 3916095 (1975-10-01), Weber
patent: 3937871 (1976-02-01), Robinson
patent: 3984833 (1976-10-01), Van Voorhis

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