CA1048157A - Video thresholder - Google Patents

Video thresholder

Info

Publication number
CA1048157A
CA1048157A CA230,888A CA230888A CA1048157A CA 1048157 A CA1048157 A CA 1048157A CA 230888 A CA230888 A CA 230888A CA 1048157 A CA1048157 A CA 1048157A
Authority
CA
Canada
Prior art keywords
signal
peak
video signal
video
delayed
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
CA230,888A
Other languages
English (en)
French (fr)
Inventor
Melvin G. Wilson
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 CA1048157A publication Critical patent/CA1048157A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01—Shaping pulses
    • H03K5/08—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding
    • H03K5/082—Shaping pulses by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding with an adaptive threshold
    • 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
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Health & Medical Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Toxicology (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • Manipulation Of Pulses (AREA)
  • Picture Signal Circuits (AREA)
  • Dc Digital Transmission (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Measurement Of Current Or Voltage (AREA)
CA230,888A 1974-08-09 1975-07-07 Video thresholder Expired CA1048157A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US496235A US3912943A (en) 1974-08-09 1974-08-09 Video thresholder

Publications (1)

Publication Number Publication Date
CA1048157A true CA1048157A (en) 1979-02-06

Family

ID=23971803

Family Applications (1)

Application Number Title Priority Date Filing Date
CA230,888A Expired CA1048157A (en) 1974-08-09 1975-07-07 Video thresholder

Country Status (8)

Country Link
US (1) US3912943A (enExample)
JP (1) JPS541531B2 (enExample)
BR (1) BR7505040A (enExample)
CA (1) CA1048157A (enExample)
DE (1) DE2532358A1 (enExample)
FR (1) FR2281680A1 (enExample)
GB (1) GB1468624A (enExample)
IT (1) IT1039027B (enExample)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058705A (en) * 1976-02-05 1977-11-15 Cannon John W Magnetic card reader
DE2800759C3 (de) * 1978-01-09 1984-08-23 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Verfahren zur Umwandlung eines Videosignals in ein Zwei-Pegel-Signal
FR2425780A1 (fr) * 1978-05-12 1979-12-07 Cit Alcatel Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image
DE2837139C3 (de) * 1978-08-25 1982-02-25 Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel Verfahren und Schaltungsanordnung zur Impulsaufsteilung
JPS562728A (en) * 1979-06-21 1981-01-13 Matsushita Electric Ind Co Ltd Binary processing circuit
US4367721A (en) * 1979-08-08 1983-01-11 Ford Motor Company Signal detection circuit with self-adjusting threshold having modulated carrier input
US4496831A (en) * 1980-02-29 1985-01-29 Symbol Technologies, Inc. Portable laser scanning system and scanning methods
US4593186A (en) * 1980-02-29 1986-06-03 Symbol Technologies, Inc. Portable laser scanning system and scanning methods
SE448921B (sv) * 1980-10-08 1987-03-23 Ibm Svenska Ab Videosignaldetektor for detektering av inkommande analoga videosignaler fran en optisk dokumentlesare och for avgivande av digitala utgangssignaler
SE448922B (sv) 1980-10-21 1987-03-23 Ibm Svenska Ab Metod for behandling av videodata vid ett optiskt teckenidentifieringssystem jemte en anordning for teckenidentifiering i en optisk dokumentlesare
US4525747A (en) * 1981-08-06 1985-06-25 Toshiyuki Sakai Analog-to-digital image signal conversion
US4673805A (en) * 1982-01-25 1987-06-16 Symbol Technologies, Inc. Narrow-bodied, single- and twin-windowed portable scanning head for reading bar code symbols
US4409470A (en) 1982-01-25 1983-10-11 Symbol Technologies, Inc. Narrow-bodied, single-and twin-windowed portable laser scanning head for reading bar code symbols
JPS5952417A (ja) * 1982-09-16 1984-03-27 Toshiba Corp デ−タ抜取回路
FR2565746A1 (fr) * 1984-06-06 1985-12-13 Sud Sa Systemes Procede et dispositif de traitement d'un signal electrique analogique et application a la lecture de codes a barres
JPS62284519A (ja) * 1986-06-02 1987-12-10 Toshiba Corp 信号検出回路
ES2039493T3 (es) * 1987-04-22 1993-10-01 Abbott Laboratories Lectores y formatos de codigo optico.
JP3556274B2 (ja) * 1994-07-13 2004-08-18 富士通株式会社 二値化回路及びそれを用いたバーコードリーダ
US8155437B2 (en) * 2007-09-07 2012-04-10 CVISION Technologies, Inc. Perceptually lossless color compression

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885551A (en) * 1955-11-30 1959-05-05 Ibm Variable voltage level discriminator varying with the input voltage level
US3566281A (en) * 1968-05-21 1971-02-23 Ibm Electric pulse wave clipping circuitry
US3804979A (en) * 1969-10-31 1974-04-16 W Knowles Detection devices for image analysis systems
US3708678A (en) * 1970-10-30 1973-01-02 Servo Corp Variable threshold circuit

Also Published As

Publication number Publication date
GB1468624A (en) 1977-03-30
US3912943A (en) 1975-10-14
FR2281680A1 (fr) 1976-03-05
FR2281680B1 (enExample) 1978-06-09
JPS5141924A (enExample) 1976-04-08
JPS541531B2 (enExample) 1979-01-25
DE2532358A1 (de) 1976-02-19
BR7505040A (pt) 1976-08-03
IT1039027B (it) 1979-12-10

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