Patent · US Active

Adaptive B-picture quantization control

US7974340B2 · kind B2 · utility

14Cited by

168References

16Claims

0Family size

Assignee

Microsoft Corporation · US

Inventors

Minghui Xia · Bellevue, US
Chih-Lung Lin · Redmond, US

Key dates

Filing date	Apr 7, 2006
Grant date	Jul 5, 2011
Priority date	—
Expiry date	Feb 11, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/61
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The present application is directed to techniques and tools for adapting the quantizer as well as the quantization step size used during video encoding. For example, a video encoder uses a non-uniform quantizer (having a relatively large dead zone ratio) for B-picture types, but uses a uniform quantizer for other types of pictures. In many encoding scenarios, this helps the encoder control bit rate for the B-picture types instead of resorting to higher quantization step sizes, which improves overall quality for the B-picture types.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.