Patents Assigned to Rapicom Inc.
  • Automatic illumination compensation circuit
    Patent number: 4133008
    Abstract: A compensation circuit for use in a document reproduction system for correcting variations in white level occurring between different documents and due to nonuniformity of the scanning process including a variable voltage gain amplifier for compensatingly modifying the output of an image scanner and having a gain control system which drives the white level amplifier gain to a predetermined level so that the scanner output is made independent of certain well known causes of nonuniformity.
    Type: Grant
    Filed: March 14, 1977
    Date of Patent: January 2, 1979
    Assignee: Rapicom Inc.
    Inventor: James G. Tisue