AU2510792A - Method and apparatus for compensation for non-uniform illumination - Google Patents

Method and apparatus for compensation for non-uniform illumination

Info

Publication number
AU2510792A
AU2510792A AU25107/92A AU2510792A AU2510792A AU 2510792 A AU2510792 A AU 2510792A AU 25107/92 A AU25107/92 A AU 25107/92A AU 2510792 A AU2510792 A AU 2510792A AU 2510792 A AU2510792 A AU 2510792A
Authority
AU
Australia
Prior art keywords
compensation
uniform illumination
illumination
uniform
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.)
Abandoned
Application number
AU25107/92A
Other languages
English (en)
Inventor
Govind Shah
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.)
United Parcel Service of America Inc
Original Assignee
United Parcel Service of America Inc
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 United Parcel Service of America Inc filed Critical United Parcel Service of America Inc
Publication of AU2510792A publication Critical patent/AU2510792A/en
Abandoned 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
    • G06K7/10544—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
    • G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Artificial Intelligence (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Length Measuring Devices By Optical Means (AREA)
AU25107/92A 1991-08-23 1992-08-24 Method and apparatus for compensation for non-uniform illumination Abandoned AU2510792A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74919091A 1991-08-23 1991-08-23
US749190 1991-08-23

Publications (1)

Publication Number Publication Date
AU2510792A true AU2510792A (en) 1993-03-16

Family

ID=25012662

Family Applications (1)

Application Number Title Priority Date Filing Date
AU25107/92A Abandoned AU2510792A (en) 1991-08-23 1992-08-24 Method and apparatus for compensation for non-uniform illumination

Country Status (2)

Country Link
AU (1) AU2510792A (fr)
WO (1) WO1993004442A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5780834A (en) * 1995-05-15 1998-07-14 Welch Allyn, Inc. Imaging and illumination optics assembly
US5784102A (en) * 1995-05-15 1998-07-21 Welch Allyn, Inc. Optical reader having improved interactive image sensing and control circuitry
US6122408A (en) * 1996-04-30 2000-09-19 Siemens Corporate Research, Inc. Light normalization method for machine vision
US6670988B1 (en) 1999-04-16 2003-12-30 Eastman Kodak Company Method for compensating digital images for light falloff and an apparatus therefor
US6546197B2 (en) 2000-03-15 2003-04-08 Fuji Photo Film Co., Ltd. Method and apparatus of correcting image data picked up from photographic film
US7268924B2 (en) 2001-01-22 2007-09-11 Hand Held Products, Inc. Optical reader having reduced parameter determination delay
GB2372392A (en) * 2001-02-16 2002-08-21 Hewlett Packard Co Improvements to image capture
JP2003087653A (ja) 2001-09-06 2003-03-20 Ricoh Co Ltd 撮像装置
US8628015B2 (en) 2008-10-31 2014-01-14 Hand Held Products, Inc. Indicia reading terminal including frame quality evaluation processing

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4314281A (en) * 1979-10-12 1982-02-02 Xerox Corporation Shading compensation for scanning apparatus
US4430748A (en) * 1981-09-21 1984-02-07 Xerox Corporation Image thresholding system

Also Published As

Publication number Publication date
WO1993004442A1 (fr) 1993-03-04

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