Image analysis – Image compression or coding – Interframe coding
Reexamination Certificate
2008-05-13
2008-05-13
Chen, Wenpeng (Department: 2624)
Image analysis
Image compression or coding
Interframe coding
C382S238000, C382S239000
Reexamination Certificate
active
07373004
ABSTRACT:
An apparatus for constant quality rate control in moving picture compression. First, a total activity measure for the current picture to be encoded in a set of consecutive pictures is calculated. Based on the total activity measure of the current picture and an activity-to-complexity ratio of a previously encoded picture of the same type in the set of consecutive pictures, a complexity measure of the current picture is estimated. Thus, an instantaneous complexity measure is updated using the complexity measure and then an instantaneous rate is calculated. A target bit budget is allocated to the current picture depending on the instantaneous rate, the complexity measure and the instantaneous complexity measure. After encoding, the activity-to-complexity ratio for the just encoded picture is computed based on the total activity measure, actual bits consumed by the picture and the average of actual quantization step sizes used to encode the picture.
REFERENCES:
patent: 5287200 (1994-02-01), Sullivan et al.
patent: 5301032 (1994-04-01), Hong et al.
patent: 5317397 (1994-05-01), Odaka et al.
patent: 5323187 (1994-06-01), Park
patent: 5404174 (1995-04-01), Sugahara
patent: 5802213 (1998-09-01), Gardos
patent: 5933532 (1999-08-01), Mihara
patent: 5969764 (1999-10-01), Sun et al.
patent: 6181742 (2001-01-01), Rajagopalan et al.
patent: 6188792 (2001-02-01), Chujoh et al.
patent: 6222881 (2001-04-01), Walker
patent: 6542549 (2003-04-01), Tan et al.
patent: 6678322 (2004-01-01), Mihara
patent: 7095784 (2006-08-01), Chang et al.
Chang Yung-Ching
Chen Chia-Chieh
Wang Teng-Kai
Birch & Stewart Kolasch & Birch, LLP
Chen Wenpeng
Ge Yuzhen
Silicon Integrated Systems Corp.
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