Apparatus and process for improving visibility of object within visual field

  • US 4,692,798 A
  • Filed: 01/07/1985
  • Issued: 09/08/1987
  • Est. Priority Date: 01/09/1984
  • Status: Expired due to Term
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First Claim
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1. An apparatus comprising:

  • means for casting visible light toward a reflective object at a frequency of no less than the critical fusion frequency;

    means for picking up an image of the object and outputting image data in accordance with the picked-up image;

    a light-intensity sensor monitoring the intensity of a light incident on said image pickup means and outputting a signal representing the level of the intensity of the incident light;

    an optical shutter of liquid crystal filtering the incident light;

    a light-intensity control circuit opening and shutting said optical shutter in accordance with the frequency of the casting of the visible light and controlling a duty cycle of said optical shutter in response to a level of said signal so as to control an effective transmissivity of said optical shutter;

    means for generating a picture signal in accordance with the image data; and

    means for displaying a picture of the object in response to the picture signal.

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