Global addressability for self-clocking glyph codes

• US 5,453,605 A
• Filed: 12/22/1993
• Issued: 09/26/1995
• Est. Priority Date: 12/22/1993
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Petrie, Glen W., Hecht, David L.
• Primary Examiner(s): Hajec, Donald
• Assistant Examiner(s): Le, Thien Minh
• Application Number:
  US08/172,508
• Time in Patent Office: 643 Days
• Field of Search: 235/467, 235/470, 235/454, 235/456, 235/494, 365/234
• US Class Current: 235/494
• CPC Class Codes: G06K 19/06037 multi-dimensional coding
• CPC Class Codes: G06K 7/143 Glyph-codes

Abstract

An optically readable record for storing encoded information comprises (1) a recording medium, (2) a self-clocking data code for encoding the information, with this data code being composed of glyphs that are written in a bounded two dimensional code field on the recording medium on centers that are spatially distributed in nominal accordance with a predetermined spatial formatting rule, and the glyphs being defined by respective symbols that are selected from a finite set of optically discriminable symbols to encode the information, and (3) a self-clocking address pattern written on the recording medium to extend across the code field along at least one axis, with this address pattern being composed of a unique glyph pattern that disambiguates spatial position within the address pattern to a subpattern precision.

Claims

1. An optically readable record for storing encoded information;

said record comprising

a recording medium;

a self-clocking data code for encoding said information;

said data code being composed of glyphs that are written in a bounded two dimensional code field on said recording medium on centers that are spatially distributed in nominal accordance with a predetermined spatial formatting rule;

said glyphs being defined by respective symbols that are selected from a finite set of optically discriminable symbols to encode said information; and

a self-clocking address pattern written on said recording medium to extend accross said code field along at least one axis;

said address pattern being composed of a glyph pattern that disambiguates logical position within said address pattern to a subpattern precision.

2. The record of claim 1 wherein

said glyphs are composed of elongated slash-like symbols that oriented at different angles to encode different digital values.

3. The record of claim 2 wherein

said glyphs are oriented at +45°

and -45°

with respect to a vertical axis of said recording medium for encoding different binary values.

7. The record of any of claims 1-6 wherein

said address pattern disambiquates said logical position by reference to a feature of said code field.

8. The record of any of claim 7 wherein

said feature is a boundary of said code field.

9. The record of any of claims 1-6 wherein

said address pattern disambiquates said logical position by reference to a feature of said address pattern.

10. The record of any of claims 1-6 wherein

said address pattern disambiquates said logical position by reference to digital code values that are encoded by said address pattern.

4. An optically readable record for storing encoded information;

said record comprising

a recording medium;

a self-clocking data code for encoding said information;

said data code being composed of glyphs that are written in a two dimensional code field on said recording medium on centers that are spatially distributed in nominal accordance with a predetermined spatial formatting rule;

said glyphs being defined by respective symbols that are selected from a finite set of optically discriminable symbols to encode said information; and

a self-clocking address pattern written on said recording medium to extend across said code field longitudinally and transversely;

said address pattern being composed of a recognizeable glyph pattern that disambiguates logical position within said address pattern to a subpattern precision.

5. The record of claim 4 wherein

said glyphs are composed of elongated slash-like symbols that oriented at different angles to encode different digital values.

6. The record of claim 5 wherein

said glyphs are oriented at +45°

and -45°

with respect to a vertical axis of said recording medium for encoding different binary values.