Patent · US Active

Signaling reference frame distances

US8085844B2 · kind B2 · utility

25Cited by

104References

19Claims

0Family size

Assignee

Microsoft Corporation · US

Inventors

Thomas W. Holcomb · Bothell, US
Kunal Mukerjee · Redmond, US
Chih-Lung Lin · Redmond, US

Key dates

Filing date	Nov 15, 2004
Grant date	Dec 27, 2011
Priority date	—
Expiry date	May 27, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/70
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Techniques and tools for signaling reference frame distances are described. For example, a video encoder signals a code for a reference frame distance for a current field-coded interlaced video frame. The code indicates a count of frames (e.g., bi-directionally predicted frames) between the current frame and a preceding reference frame. The code may be a variable length code signaled in the frame header for the current frame. The encoder may selectively signal the use of a default value for reference frame distances rather than signal a reference frame distance per frame. A video decoder performs corresponding parsing and decoding.

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