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Document security system

  • US 5,355,411 A
  • Filed: 02/11/1993
  • Issued: 10/11/1994
  • Est. Priority Date: 08/14/1990
  • Status: Expired due to Fees
First Claim
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1. A security system for encoding documents with a signature representative of a user, said security system comprising:

  • signal recording means for reading a sample signature and for digitally encoding said sample signature to produce a digitally encoded signature that cannot be read directly by the unaided eye;

    digital data compression means coupled to said signal recording means for compressing the digitally encoded signature into a compressed signature with a reduced amount of data of 160 bytes or less, said digital data compression means including means for setting a usage size of the signature and means for setting a level of digital data to fit into said usage size, scanning means for scanning said signature on a line by line basis to produce a scanned image, means for determining and removing multiple dots from said scanned image and storage means for storing a number of dots and a number of dot displacements, counting and storage means for counting and storing increment values and a number and position of stray dots, comparison means for comparing a total dot count in said compressed digitised signature with said digital level, and scaling means for scaling the image size of the signature by a target or dot count in vertical and horizontal directions;

    recording means for magnetically recording the compressed signature on a magnetic stripe of a document;

    signal reading means including magnetic stripe reading means for reading a compressed signature so stored on a magnetic stripe; and

    display means coupled to the signal reading means for visually displaying the compressed signature so that a visual compression between the compressed signature and a further sample signature provided by a user may be made to verify the identity of the user.

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