Mobile communications terminal for compensating automatic...

Details Mobile communications terminal for compensating automatic... Mobile communications terminal for compensating automatic...

2006-03-03

2008-09-30

Fuller, Rodney E (Department: 2862)

Photography

Exposure control circuit

Having plural photocells

C396S241000, C348S364000

Reexamination Certificate

active

07430371

ABSTRACT:
A method for compensating an automatic exposure of a camera in a mobile communication terminal. The method includes determining a presumptive error value based on an average luminance value of an input current image frame and a particular target luminance value, selecting a convergent coefficient value based on the determined presumptive error value, determining a weight value of an adaptive filter based on the determined convergent coefficient value, and determining an exposure value for a next image frame based on the selected weight value, the determined presumptive error value and the exposure value of the current image frame.

REFERENCES:
patent: 5703644 (1997-12-01), Mori et al.
patent: 2004/0066464 (2004-04-01), Ueyama
patent: 2005/0068428 (2005-03-01), Uchida
patent: 2006/0062092 (2006-03-01), Ueyama

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