CA930865A - Dynamic discrimination reference level generator for a parallel channel optical document scanner - Google Patents

Dynamic discrimination reference level generator for a parallel channel optical document scanner

Info

Publication number
CA930865A
CA930865A CA087586A CA87586A CA930865A CA 930865 A CA930865 A CA 930865A CA 087586 A CA087586 A CA 087586A CA 87586 A CA87586 A CA 87586A CA 930865 A CA930865 A CA 930865A
Authority
CA
Canada
Prior art keywords
reference level
channel optical
parallel channel
document scanner
level generator
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.)
Expired
Application number
CA087586A
Inventor
P. Segar Lawrence
E. Hall Richard
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Application granted granted Critical
Publication of CA930865A publication Critical patent/CA930865A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G06V30/16—Image preprocessing
    • G06V30/162—Quantising the image signal
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Character Input (AREA)
  • Image Analysis (AREA)
CA087586A 1969-08-01 1970-07-08 Dynamic discrimination reference level generator for a parallel channel optical document scanner Expired CA930865A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US84683469A 1969-08-01 1969-08-01

Publications (1)

Publication Number Publication Date
CA930865A true CA930865A (en) 1973-07-24

Family

ID=25299071

Family Applications (1)

Application Number Title Priority Date Filing Date
CA087586A Expired CA930865A (en) 1969-08-01 1970-07-08 Dynamic discrimination reference level generator for a parallel channel optical document scanner

Country Status (4)

Country Link
CA (1) CA930865A (en)
DE (1) DE2038054C3 (en)
FR (1) FR2057695A5 (en)
GB (1) GB1280915A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2103449B (en) * 1981-06-29 1985-05-30 Nippon Telegraph & Telephone Method and apparatus for gray level signal processing
JPH08329180A (en) * 1995-06-05 1996-12-13 Asahi Optical Co Ltd Data symbol reader

Also Published As

Publication number Publication date
DE2038054A1 (en) 1971-02-04
DE2038054C3 (en) 1978-06-29
FR2057695A5 (en) 1971-05-21
DE2038054B2 (en) 1977-11-17
GB1280915A (en) 1972-07-12

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