Apparatus for modulating the output of a CCD camera
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United States of America Patent
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Nov 10, 1992
Grant Date -
N/A
app pub date -
Feb 26, 1990
filing date -
Feb 26, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for automatically adjusting the exposure of video images of the type that are commonly generated during endoscopic examination of tissue. The output of a video amplifier is detected and compared with an ideal value. A corresponding adjustment of amplifier gain is determined and such adjustment compared with a predetermined optimum range of amplifier gain. In the event that the calculated adjustment lies within such optimum range, the gain of the amplifier is adjusted accordingly. In the event that the optimum range is exceeded by the absolute value of the calculated adjustment, the exposure time of the camera sensor and the gain of the amplifier are adjusted in opposite senses whereby the amplifier is continuously operated within its optimum range.
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