DC coefficient signaling at small quantization step sizes

Details DC coefficient signaling at small quantization step sizes DC coefficient signaling at small quantization step sizes

2004-07-17

2010-06-15

Banks Harold, Marsha D (Department: 2621)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240180, C375S240230

Reexamination Certificate

active

07738554

ABSTRACT:
Described tools and techniques relate to signaling for DC coefficients at small quantization step sizes. The techniques and tools can be used in combination or independently. For example, a tool such as a video encoder or decoder processes a VLC that indicates a DC differential for a DC coefficient, a FLC that indicates a value refinement for the DC differential, and a third code that indicates the sign for the DC differential. Even with the small quantization step sizes, the tool uses a VLC table with DC differentials for DC coefficients above the small quantization step sizes. The FLCs for DC differentials have lengths that vary depending on quantization step size.

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