Apparatus for automatically regulating the supply of light to an

Details Apparatus for automatically regulating the supply of light to an Apparatus for automatically regulating the supply of light to an

1990-09-21

1992-07-21

Pellegrino, Stephen C.

Surgery

Truss

Perineal

358 98, A61B 104, H04N 718

Patent

active

051313812

ABSTRACT:
An apparatus for automatically regulating a light source for providing light for illuminating an object viewed by means of an endoscope equipped with a video camera, there is provided a signal processing device having a circuit for defining the density value of the video signal of each line of the camera image, by means of which circuit, the video signal emitted is passed to a comparator which compares it with a brightness threshold voltage which can be preset. A control signal for regulating the light source is determined by counting the image lines having a brightness exceeding the threshold voltage and linking the resultant count to a mathematical function. The actual value obtained from the video signal is independent of the area of the bright parts of the image and is, therefore, independent of the diameter of the image circle of the endoscope.

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