Bar code decoding with dynamically loadable data character sets

• US 5,563,399 A
• Filed: 10/02/1995
• Issued: 10/08/1996
• Est. Priority Date: 09/15/1994
• Status: Expired due to Term

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Metanetics Corporation
• Inventors: Wang, Ynjiun P.
• Primary Examiner(s): PITTS, HAROLD I
• Application Number:
  US08/537,459
• Time in Patent Office: 372 Days
• Field of Search: 235/462, 235/463
• US Class Current: 235/462.1
• CPC Class Codes: G06K 7/14 using light without selection of wavelength, e.g. sensing reflected white light G06K7/10831 - G06K7/1097 take precedence
• CPC Class Codes: G06K 7/1417 2D bar codes

Abstract

The reading and decoding of two-dimensional bar codes and other dataforms are simplified and field loading of different data character sets is enabled. Dynamic loading of new data character sets fully or partially superseding a factory installed default character set correlation listing is enabled by use of loadable correlation listings keyed to foreign language characters, symbols, words or phrases relevant to particular applications. The loadable correlation listings can be encoded into a two-dimensional bar code and loaded via a reading of the bar code by the bar code reader. Two or more correlation listings may be loaded into a bar code reader, with one of the correlation listings selected for decoding a particular bar code.

Claims

1. A method of decoding a 2-D bar code in a bar code reader, comprising the steps of:

(a) loading into said bar code reader, prior to step (e), a loadable correlation listing correlating decoded values of bar/space patterns to corresponding data characters;

(b) reading a plurality of bar/space patterns of said 2-D bar code;

(c) utilizing the results of step (b) to provide a decoded value for one said bar/space pattern;

(d) repeating step (c) for other bar/space patterns of said bar code to provide decoded values thereof; and

(e) utilizing said correlation listing to correlate each of a plurality of said decoded values as provided in steps (c) and (d) to a corresponding data character.

2. A method as in claim 1, wherein step (e) comprises:

(e) selectively utilizing one of said loadable correlation listing and a default correlation listing available in said bar code reader, to correlate each of a plurality of said decoded values as provided in steps (c) and (d) to a corresponding data character.

3. A method as in claim 1, wherein step (a) comprises loading said loadable correlation listing by reading a 2-D bar code containing said loadable correlation listing in encoded form.

4. A method as in claim 1, wherein step (a) comprises loading a plurality of said loadable correlation listings and step (e) comprises:

(e) selectively utilizing one of said loadable correlation listings to correlate each of a plurality of said decoded values as provided in steps (c) and (d) to a corresponding data character.

5. A method as in claim 4, wherein step (a) comprises loading said loadable correlation listings by reading a 2-D bar code containing said loadable correlation listings in encoded form.

6. A method as in claim 1, wherein said bar code comprises data bar/space patterns representative of data characters and instruction bar/space patterns representative of information relating to said data bar/space patterns, and step (e) is performed only with respect to a plurality of decoded values provided from said data bar/space patterns.

7. A method as in claim 6, additionally including the following step between steps (d) and (e):

(x) utilizing decoded values of said instruction bar/space patterns to provide information used to control the processing of said data bar/space patterns in said bar code reader.

8. A method of decoding a 2-D dataform in a dataform reader, comprising the steps of:

(a) reading a 2-D dataform containing a loadable correlation listing to load into said dataform reader, prior to step (c), a loadable correlation listing correlating bar/space patterns to corresponding data characters;

(b) reading a plurality of bar/space patterns of said 2-D dataform; and

(c) utilizing the results of step (b) and said correlation listing to correlate each of a plurality of said bar/space patterns to a corresponding data character.

9. A method as in claim 8, wherein step (c) comprises:

(c) utilizing the results of step (b) and a selected one of said loadable correlation listing and a default correlation listing available in said dataform reader, to correlate each of a plurality of said bar/space patterns to a corresponding data character.

10. A method as in claim 8, wherein said dataform comprises data bar/space patterns representative of data characters and instruction bar/space patterns representative of information relating to said data bar/space patterns, and step (c) is performed only with respect to a plurality of decoded values provided from said data bar/space patterns.

11. A method of decoding a 2-D dataform in a dataform reader, comprising the steps of:

(a) loading into said dataform reader, prior to step (c), a plurality of correlation listings, each correlating bar/space patterns to corresponding data characters;

(b) reading a plurality of bar/space patterns of said 2-D dataform; and

(c) utilizing the results of step (b) and a selected one of said correlation listings to correlate each of a plurality of said bar/space patterns to a corresponding data character.

12. A method as in claim 11, wherein step (a) comprises loading at least one of said correlation listings as a loadable correlation listing by reading a 2-D dataform containing said loadable correlation listing in encoded form.

13. A method as in claim 11, wherein step (a) comprises providing one of said correlation listings as a loadable correlation listing and one of said correlation listings as a default correlation listing stored in said dataform reader.

14. A method as in claim 13, wherein step (a) comprises loading said loadable correlation listing by reading a 2-D dataform containing said loadable correlation listing in encoded form.

15. A method as in claim 11, wherein said 2-D dataform comprises data bar/space patterns representative of data characters and instruction bar/space patterns representative of information relating to said data bar/space patterns, and step (c) is performed only with respect to a plurality of decoded values provided from said data bar/space patterns.