Photography – Exposure control circuit
Reexamination Certificate
2007-06-12
2010-02-23
Perkey, W. B. (Department: 2862)
Photography
Exposure control circuit
C396S246000, C348S221100
Reexamination Certificate
active
07668452
ABSTRACT:
An automatic exposure control apparatus employed by an image sensor module including a lens unit, an image sensing unit having a shutter, and an image signal processing unit, the apparatus including: a brightness calculator extracting average brightness of a image signal; a brightness adjustment determiner determining whether to fix or adjust a speed of the shutter based on the average brightness; an adjustment path controller controlling the speed of the shutter by using the brightness error; a digital filter filtering the brightness error; a shutter speed adjuster adjusting a present shutter speed value by using one of the brightness error and the filtered brightness; and a shutter speed controller controlling a speed of the shutter by using the adjusted shutter speed value.
REFERENCES:
patent: 4739409 (1988-04-01), Baumeister
patent: 4899191 (1990-02-01), Maruyama
patent: 4951077 (1990-08-01), Kaneko et al.
patent: 5650944 (1997-07-01), Kise
patent: 2001/0028796 (2001-10-01), Yamanaka et al.
patent: 2003-153073 (2003-05-01), None
Kang Bong Soon
Kim Hyun Sik
Kim Joo Hyun
Kim Kang Joo
Kim Tae Eung
Perkey W. B.
Samsung Electro-Mechanics Co. Ltd.
Smith Linda B
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