Method and apparatus for selecting a reference frame for...

Details Method and apparatus for selecting a reference frame for... Method and apparatus for selecting a reference frame for...

2006-11-29

2011-11-01

Philippe, Gims (Department: 2485)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C382S236000

Reexamination Certificate

active

08050324

ABSTRACT:
Method and apparatus for selecting a reference frame for motion estimation in a video encoder is described. In one example, motion estimation is performed on a current macroblock in a current frame with respect to a reference frame to obtain a motion vector, a sum of absolute difference (SAD), a global motion vector, and an average SAD. A first relative change of the motion vector with respect to the global motion vector is computed. A second relative change of the SAD with respect to the average SAD is computed. A functional based on the first relative change, the second relative change, a first parameter, and a second parameter is computed. The functional is compared with a threshold. The reference frame is selected if the functional satisfies the threshold.

REFERENCES:
patent: 6996177 (2006-02-01), Beuker
patent: 7227896 (2007-06-01), Sun
patent: 2007/0047653 (2007-03-01), Kim et al.
patent: 2010/0079606 (2010-04-01), Batur

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