US6182901B1
Expired / Lapsed
US
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Orientational disambiguation for self-clocking glyph codes
Assignee: Xerox Corp
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Filing: 1995-09-21
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Granted: 2001-02-06
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Expires: 2015-09-21
Abstract
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 two dimensional code field on the recording medium on centers that are spatially distributed in nominal accordance with a predetermined spatial formatting rule. The glyphs are defined by respective symbols that are selected from a finite set of optically discriminable symbols to encode the information. Further, there is at least one additional glyph pattern that is written on the recording medium in nominal accordance with the aforementioned spatial formatting rule, with this additional code pattern being discriminable from the data code and being selected to disambiguate data codes that are rotated and/or reflected.
Inventors
- 👤 David L. Hecht
- 👤 L. Noah Flores
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:21
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/14; G06K7/1404; G06K7/1408; G06K7/143; G06K19/00; G06K19/06; G06K19/06009; G06K19/06037
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
An optically readable record for storing encoded digital information; said record comprising a recording medium; a self-clocking data code pattern for encoding said information; said data code pattern 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 digital information; and at least one additional code pattern that is written on linearly aligned centers on said recording medium in nominal accordance with said spatial formatting rule, said additional code pattern being composed of glyphs which are selected from said finite set of symbols in accordance with a predetermined, asymmetric digital code sequence, whereby said asymmetric code sequence disambiguates between data codes that are rotated 0° and 180°, even though said data code pattern and said additional code pattern are composed of glyphs that provide a substantially uniform visual appearance.
Claim 2
Dependent Claim
172 words
An optically readable record for storing encoded digital information; said record comprising a recording medium; a self-clocking data code pattern for encoding said information; said data code pattern 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 digital information; and at least one additional code pattern that is written on linearly aligned centers on said recording medium in nominal accordance with said spatial formatting rule, said additional code pattern being composed of glyphs which are selected from said finite set of symbols in accordance with a predetermined, asymmetric digital code sequence, whereby said asymmetric code sequence disambiguates between data codes that are rotated 0° and 180°, even though said data code pattern and said additional code pattern are composed of glyphs that provide a substantially uniform visual appearance.
Claim 3
Dependent Claim
24 words
The record of claim 1 wherein said additional code pattern is further selected to also disambiguate data codes that are rotated 90° and 270°.
Claim 4
Dependent Claim
22 words
The record of claim 2 wherein said additional code pattern os further selected to also disambiguate mirror image transformed data code patterns.
Claim 5
Dependent Claim
28 words
The record of any of claims 1 - 3 wherein said glyphs are composed of elongated slash-like symbols that oriented at different angles to encode different digital values.
Claim 6
Dependent Claim
29 words
The record of claim 4 wherein said glyphs are oriented at +45° and −45° with respect to a vertical axis of said recording medium for encoding different binary values.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-02-06 | 2004-08-07 | 2005-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-02-06 | 2008-08-07 | 2009-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-02-06 | 2012-08-07 | 2013-02-06 | $7700.00 | Window Closed / Lapsed |