H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/7
H04N 5/38 (2006.01) G06T 9/00 (2006.01) H04N 1/417 (2006.01)
Patent
CA 1118091
D/75629/75629Q1/75629Q2/76001/76001Q BLOCK LENGTH MULTIPLE PLUS RUN LENGTH RESIDUE CODES FOR RUN LENGTH ENCODING ABSTRACT OF THE DISCLOSURE A fractionally difference modulated binary video signal having a raster scan format and containing some scan lines of difference modulated picture elements and other scan lines of unmodulated picture elements is compressed by a truncated run length encoder which converts black terminated white runs into run length message codes, non-terminating black picture elements into individual message bits, and unterminated white runs into end-of-line message codes. No distinction is made between the difference modulated and un- modulated picture elements while generating the run length message codes and the individual message bits, but different end-of-line message codes are generated in response to the unterminated white runs of difference modulated and unmudulated picture elements, thereby providing a scan line-by-scan line indication of whether the picture elements are difference modulated or not. A block length multiple plus run length residue code format is employed for encoding the black terminated white runs, whereby runs in excess of a predetermined block length are represented by a block length multiple code plus, for any runs which are not integer multiples of the block length, run length residue codes. Shorter black terminated white runs are repre- sented merely by run length residue codes.
291838
Sim & Mcburney
Xerox Corporation
LandOfFree
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