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Electronic image acquistion system with image optimization by intensity entropy analysis and feedback control

  • US 5,387,930 A
  • Filed: 01/25/1993
  • Issued: 02/07/1995
  • Est. Priority Date: 05/25/1990
  • Status: Expired due to Fees
First Claim
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1. An image acquisition system comprising:

  • (a) an electronic camera having a lens with a selectively adjustable aperture control;

    (b) an amplifier coupled to said camera to receive image data therefrom, said amplifier having selectively adjustable gain and offset controls;

    (c) a digitizer coupled to said amplifier to receive amplified image data therefrom; and

    (d) a processor coupled to said digitizer to receive digitized image data therefrom, said processor having outputs coupled to said amplifier gain and offset controls for selectively adjusting the same, and an output connected to said lens aperture control for selectively adjusting the same;

    (e) said processor being adapted to process said digitized image data received from said digitizer to calculate therefrom an intensity entropy of an image and, in response thereto, to provide outputs selectively to said amplifier gain and offset controls and said lens aperture control for selectively adjusting the same to optimize the acquired image information, said intensity entropy of said image being defined as Hn, where;

    ##EQU12## and n=the number of quantized intensity levels of the digitizer, andPi =the probability of the ith intensity level occurring in the image and is defined by pi =fi /N where f is the frequency of occurrence of the ith intensity level in the digitized image data and N is the total number of pixels in the digitized image data.

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