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Handwritten keyboardless entry computer system

  • US 4,972,496 A
  • Filed: 03/24/1987
  • Issued: 11/20/1990
  • Est. Priority Date: 07/25/1986
  • Status: Expired due to Term
First Claim
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1. A microprocessor-based process for recognition, translation and display of Handwritten Symbols and execution of Editing Functions and other commands comprising the steps of:

  • (a) Creating a personalized database for each individual user of the process by having the user initially input a Handwritten Symbol for each character corresponding with a Font Symbol to be displayed or Editing Function or other command to be executed;

    (b) Determining a unique set of Stroke characteristics to characterize each such symbol and storing it in the database;

    (c) Writing or drawing Handwritten Symbols on a computer screen with a stylus;

    (d) Digitizing each Handwritten Symbol to identify the x, y coordinates of a multiplicity of Points into Strokes defining the Handwritten Symbol;

    (e) Processing the digitized characteristics of each Stroke of a Handwritten Symbol to determine the predetermined characteristics of the Handwritten Symbol;

    (f) Each of steps (b) and (e) comprising a determination of the (i) length of the Stroke, (ii) average slope of the Stroke, (iii) the Stroke centroid'"'"'s height above base line, (iv) rate of change in slope of Stroke and (v) comparison of the location of the centroid of each Stroke with the centroid of the Handwritten Symbol;

    (g) Searching the data base to find a "hit," a perfect or the closest correspondence to the characteristics of a Font Symbol;

    (h) Displaying the Font Symbol or performing the Editing Function or other command most closely associated with the "hit" characteristics.

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