Imaging apparatus and control circuit of imaging device

Details Imaging apparatus and control circuit of imaging device Imaging apparatus and control circuit of imaging device

2005-07-22

2008-11-25

Ye, Lin (Department: 2622)

Television

Camera, system and detail

Optics

C348S229100

Reexamination Certificate

active

07456899

ABSTRACT:
In exposure control of an imaging apparatus, if a vertical scanning period is enlarged to increase an exposure time when the exposure time reaches an upper limit value, there occurs a problem in that a frame rate is reduced. Accordingly, when a subject is dark, an auto exposure control circuit sets the vertical scanning period V to a standard value Vst, increases the exposure time E to the upper limit value Emax (P60) and then increases a gain α of an AGC circuit (P62). If the image is still dark even when the gain α reaches the upper limit value α max, the auto exposure control circuit switches the vertical scanning period V to an enlarged value Vex and thus more increases the exposure time E (P64).

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