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Scanning line filter

  • US 3,993,888 A
  • Filed: 10/29/1974
  • Issued: 11/23/1976
  • Est. Priority Date: 10/29/1974
  • Status: Expired due to Term
First Claim
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1. An image processing means for enhancing and digitizing images including:

  • photodiode detector array means defined by a plurality of pairs of diametrically located, radially extending pairs of elements surrounding a central element with each of said elements producing a current output proportional to light incident thereon;

    a plurality of preamplifier means for converting the current outputs of each of said pairs of elements and said central element into voltages which are supplied as output signals;

    minimum detector means connected to each of said preamplifier means for said pairs of elements and which produces an output signal representative of the least incident light on a pair of said pairs of elements;

    maximum detector means connected to each of said preamplifier means for said pairs of elements and which produces an output signal representative of the most incident light on a pair of said pairs of elements;

    averaging means connected to each of said preamplifier means for said pairs of elements and which produces an output signal equal to the average value of all of said pairs of elements with a predetermined gain;

    summing means for summing the output signals from said minimum detector means, said maximum detector means, said averaging means and said preamplifier means connected to said central element for producing an output signal which is representative of the sum of the signals supplied thereto; and

    comparator means connected to said summing means and producing a digital logic signal which is the binary representation of the output of said elements of said photodiode detector array means.

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