Television – Camera – system and detail – Combined image signal generator and general image signal...
Reexamination Certificate
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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Greenblum & Bernstein P.L.C.
Ometz David
PENTAX Corporation
Prabhakher Pritham D.
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