CA2044463A1 - Binary image processing for decoding self-clocking glyph shape codes - Google Patents

Binary image processing for decoding self-clocking glyph shape codes

Info

Publication number
CA2044463A1
CA2044463A1 CA2044463A CA2044463A CA2044463A1 CA 2044463 A1 CA2044463 A1 CA 2044463A1 CA 2044463 A CA2044463 A CA 2044463A CA 2044463 A CA2044463 A CA 2044463A CA 2044463 A1 CA2044463 A1 CA 2044463A1
Authority
CA
Canada
Prior art keywords
decoding
image processing
codes
binary image
glyph shape
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2044463A
Other languages
French (fr)
Other versions
CA2044463C (en
Inventor
Dan S. Bloomberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Publication of CA2044463A1 publication Critical patent/CA2044463A1/en
Application granted granted Critical
Publication of CA2044463C publication Critical patent/CA2044463C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G06K7/14—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
    • G06K7/1408—Methods for optical code recognition the method being specifically adapted for the type of code
    • G06K7/143—Glyph-codes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
    • G06K19/06037—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking multi-dimensional coding
    • 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
    • G06K7/01—Details
    • G06K7/016—Synchronisation of sensing process
    • G06K7/0166—Synchronisation of sensing process by means of clock-signals derived from the code marks, e.g. self-clocking code
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition
    • G06V30/22—Character recognition characterised by the type of writing
    • G06V30/224—Character recognition characterised by the type of writing of printed characters having additional code marks or containing code marks

Abstract

Binary image processing techniques are provided for decoding bitmap image space representations of self-clocking glyph shape codes of various types (e.g., codes presented as original or degraded images, with one or a plurality of bits encoded in each glyph, while preserving the discriminability of glyphs that encode different bit values) and for tracking the number and locations of the ambiguities (sometimes referred to herein as "errors") that are encountered during the decoding of such codes. A substantial portion of the image processing that is performed in the illustrated embodiment of this invention is carried out through the use of morphological filtering operations because of the parallelism that is offered by such operations.
Moreover, the error detection that is performed in accordance with this invention may be linked to or compared against the error statistics from one or more alternative decoding process, such as the convolution filtering process that is disclosed herein, to increase the reliability of the decoding that is obtained.
CA002044463A 1990-07-31 1991-06-12 Binary image processing for decoding self-clocking glyph shape codes Expired - Fee Related CA2044463C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US560659 1990-07-31
US07/560,659 US5168147A (en) 1990-07-31 1990-07-31 Binary image processing for decoding self-clocking glyph shape codes

Publications (2)

Publication Number Publication Date
CA2044463A1 true CA2044463A1 (en) 1992-02-01
CA2044463C CA2044463C (en) 1998-04-14

Family

ID=24238765

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002044463A Expired - Fee Related CA2044463C (en) 1990-07-31 1991-06-12 Binary image processing for decoding self-clocking glyph shape codes

Country Status (5)

Country Link
US (1) US5168147A (en)
EP (1) EP0469868B1 (en)
JP (1) JPH0778818B2 (en)
CA (1) CA2044463C (en)
DE (1) DE69129136T2 (en)

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JPH04233677A (en) 1992-08-21
EP0469868A3 (en) 1993-07-07
DE69129136D1 (en) 1998-04-30
CA2044463C (en) 1998-04-14
JPH0778818B2 (en) 1995-08-23
EP0469868A2 (en) 1992-02-05
EP0469868B1 (en) 1998-03-25
US5168147A (en) 1992-12-01

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