Automatic gain control device for electronic endoscope

Details Automatic gain control device for electronic endoscope Automatic gain control device for electronic endoscope

2007-07-24

2007-07-24

Ometz, David (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S229100, C348S241000

Reexamination Certificate

active

10446849

ABSTRACT:
An automatic gain control device for an electronic endoscope is provided and comprises a controllable gain amplifier, an A/D converter, a histogram circuit, and a CPU. The controllable gain amplifier amplifies image signals from an imaging device. Amplified image signals from the controllable gain amplifier are input to the A/D converter. A histogram of the amplified image signals from the controllable gain amplifier is produced by the histogram circuit when an image taken in a white-balance test accessory is taken. By using the CPU, the gain of the controllable gain amplifier is adjusted in accordance with the determination of whether a saturated pixel exists for signals in the tolerance range of the A/D converter, so that a linear region of the image signals from the controllable gain amplifier substantially coincides with the tolerance range.

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