Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2007-08-07
2007-08-07
Rao, Anand (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240040
Reexamination Certificate
active
10443804
ABSTRACT:
An apparatus for variable bit 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. A statistical complexity measure is then calculated from the complexity measure of the current picture. 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 current picture, the activity-to-complexity ratio for the current picture is computed based on the total activity measure, actual bits consumed by the current picture and an average of actual quantization step sizes used to encode the current picture.
REFERENCES:
patent: 6181742 (2001-01-01), Rajagopalan et al.
patent: 6522693 (2003-02-01), Lu et al.
Chang Yung-Ching
Hsu Kuo-Ping
Yao Jo-Tan
Birch & Stewart Kolasch & Birch, LLP
Rao Anand
Silicon Integrated Systems Corp.
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