Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1990-02-26
1992-11-10
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358209, 35821315, 358 98, H04N 314, H04N 5335, H04N 530
Patent
active
051629135
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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Article: Imaide et al., "Long-Exposure Video Camera With Digital Memory", IEEE International Conference on Consumer Electronics (1988), p. 2.
A copy of the European Search Report is also enclosed.
Chatenever David
Harris Ralph D.
Stokes Randal E.
Groody James J.
Kramsky Elliott N.
Medical Concepts Inc.
Metjahic Safet
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