Quantization control for variable bit depth

Details Quantization control for variable bit depth Quantization control for variable bit depth

2005-05-11

2011-10-25

Patel, Jay Au (Department: 2485)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240010, C375S240020, C375S240040, C375S240050, C375S240250, C375S240260

Reexamination Certificate

active

08045614

ABSTRACT:
The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSNof the quantization parameter QP, which function QSNhas been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth—a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).

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