WO2002071309A3 - Apparatus and method for decoding damaged optical codes - Google Patents

Apparatus and method for decoding damaged optical codes

Info

Publication number
WO2002071309A3
WO2002071309A3 PCT/US2002/001209 US0201209W WO02071309A3 WO 2002071309 A3 WO2002071309 A3 WO 2002071309A3 US 0201209 W US0201209 W US 0201209W WO 02071309 A3 WO02071309 A3 WO 02071309A3
Authority
WO
WIPO (PCT)
Prior art keywords
symbol
missing
error
reader
enhances
Prior art date
Application number
PCT/US2002/001209
Other languages
French (fr)
Other versions
WO2002071309A2 (en
Inventor
Alex Roustaei
Wenji Xia
Dennis G Priddy
Original Assignee
Symagery Microsystems Inc
Alex Roustaei
Wenji Xia
Dennis G Priddy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Symagery Microsystems Inc, Alex Roustaei, Wenji Xia, Dennis G Priddy filed Critical Symagery Microsystems Inc
Priority to AU2002234256A priority Critical patent/AU2002234256A1/en
Priority to EP02701058A priority patent/EP1466290A2/en
Publication of WO2002071309A2 publication Critical patent/WO2002071309A2/en
Publication of WO2002071309A3 publication Critical patent/WO2002071309A3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10792—Special measures in relation to the object to be scanned
    • G06K7/10801—Multidistance reading
    • G06K7/10811—Focalisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/1098—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices the scanning arrangement having a modular construction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
    • G06K7/1404—Methods for optical code recognition
    • G06K7/146—Methods for optical code recognition the method including quality enhancement steps
    • G06K7/1473—Methods for optical code recognition the method including quality enhancement steps error correction

Abstract

An improved optical code (101, 102, 103) reading system and method that enhances the ability of a reader to locate a symbol within a field of view and enhances the error-correcting properties of the encoding scheme commonly used in 2D bar codes (101, 102, 103). The reader offsets the effects of damaged finder patterns and missing symbol perimeters and, thereafter, detects high-level symbol information such as the code type, symbol size, and the number of rows and columns in the symbol. The reader then identifies those missing portions of a damaged symbol and marks each missing data bit location with a predetermined indicator. A decoding algorithm then interprets the missing bit indicator as an error of known location (e.g., an 'erasure'), thereby nearly doubling the error correcting strength of all bar codes employing the Reed-Solomon error correction scheme.
PCT/US2002/001209 2001-03-05 2002-01-15 Apparatus and method for decoding damaged optical codes WO2002071309A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2002234256A AU2002234256A1 (en) 2001-03-05 2002-01-15 Apparatus and method for decoding damaged optical codes
EP02701058A EP1466290A2 (en) 2001-03-05 2002-01-15 Apparatus and method for decoding damaged optical codes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/801,111 2001-03-05
US09/801,111 US6685095B2 (en) 1998-05-05 2001-03-05 Apparatus and method for decoding damaged optical codes

Publications (2)

Publication Number Publication Date
WO2002071309A2 WO2002071309A2 (en) 2002-09-12
WO2002071309A3 true WO2002071309A3 (en) 2004-07-29

Family

ID=25180214

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/001209 WO2002071309A2 (en) 2001-03-05 2002-01-15 Apparatus and method for decoding damaged optical codes

Country Status (4)

Country Link
US (1) US6685095B2 (en)
EP (1) EP1466290A2 (en)
AU (1) AU2002234256A1 (en)
WO (1) WO2002071309A2 (en)

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Also Published As

Publication number Publication date
US6685095B2 (en) 2004-02-03
WO2002071309A2 (en) 2002-09-12
EP1466290A2 (en) 2004-10-13
AU2002234256A1 (en) 2002-09-19
US20020041712A1 (en) 2002-04-11

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