Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2005-12-27
2010-11-30
Haskins, Twyler L (Department: 2625)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240240, C375S213000, C375S213000
Reexamination Certificate
active
07843998
ABSTRACT:
The invention is related to entropy coding/decoding of transform coefficient data in video compression systems. For entropy coding coefficients representing a block in a video image, a preferred embodiment of the present invention introduces events combining the position of the last non-zero coefficient in the block with whether the absolute value is greater than 1. Further, no information from outside the macroblock is used to decide what VLC to use. Coefficients are typically coded by starting in a Run-mode and continuing in Level-mode when the first coefficient with absolute value >1 is found.
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Haskins Twyler L
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Pachol Nicholas C
Tandberg Telecom AS
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