Pulse or digital communications – Bandwidth reduction or expansion
Reexamination Certificate
2005-03-01
2009-08-25
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Bandwidth reduction or expansion
C375S240160, C375S240130, C375S240170, C375S240240
Reexamination Certificate
active
07580456
ABSTRACT:
Motion-compensated video coding that employs prediction-based directional fractional pixel motion estimation is described. The fractional pixel motion estimation uses prediction-based searching and directional searching to search for candidate sub-pixel motion vectors oriented in a certain direction. With prediction-based searching, sub-pixel motion vectors are predicted using two techniques—median prediction and up-layer prediction. The search may be terminated early if a sub-pixel motion vector with sufficiently minimum cost is found. If prediction-based searching does not produce such a sub-pixel motion vector, the directional searching examines points in the predicted direction, rather than all eight possible neighboring points, to reduce the number of search points. Because the prediction-based directional fractional pixel motion estimation does not involve examination of neighboring integer pixel points, it can be used with any integer pixel motion estimation algorithm.
REFERENCES:
patent: 2004/0264572 (2004-12-01), Sato et al.
patent: 2005/0207663 (2005-09-01), Zeng et al.
patent: 2006/0002474 (2006-01-01), Au et al.
Li Jiang
Li Shipeng
Lee & Hayes PLLC
Liu Shuwang
Microsoft Corporation
Timory Kabir A
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