BE898990A - DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL INTO A TWO-LEVEL SIGNAL - Google Patents

DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL INTO A TWO-LEVEL SIGNAL

Info

Publication number
BE898990A
BE898990A BE0/212445A BE212445A BE898990A BE 898990 A BE898990 A BE 898990A BE 0/212445 A BE0/212445 A BE 0/212445A BE 212445 A BE212445 A BE 212445A BE 898990 A BE898990 A BE 898990A
Authority
BE
Belgium
Prior art keywords
signal
converting
video signal
document
analogue video
Prior art date
Application number
BE0/212445A
Other languages
French (fr)
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of BE898990A publication Critical patent/BE898990A/en

Links

Classifications

    • 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

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Picture Signal Circuits (AREA)
  • Collating Specific Patterns (AREA)

Abstract

Pour cette conversion, le signal vidéo obtenu par exploration d'un document est fourni, avec un signal de référence, à un circuit de comparaison. Pour éviter que le signal de sortie de ce circuit soit influencé par des irrégularités éventuelles du document, et pour limiter la perte d'information lorsque le document comporte des zones grises ou colorées, le signal de référence est formé par la somme des versions pondérées d'au moins deux signaux de référence auxiliaires. Application : dispositifs d'exploration d'empreintes digitales.For this conversion, the video signal obtained by scanning a document is supplied, with a reference signal, to a comparison circuit. To prevent the output signal from this circuit from being influenced by possible irregularities in the document, and to limit the loss of information when the document contains gray or colored areas, the reference signal is formed by the sum of the weighted versions of '' at least two auxiliary reference signals. Application: fingerprint scanning devices.

BE0/212445A 1983-02-24 1984-02-22 DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL INTO A TWO-LEVEL SIGNAL BE898990A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL8300686A NL8300686A (en) 1983-02-24 1983-02-24 DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL TO A TWO-VALUE SIGNAL.

Publications (1)

Publication Number Publication Date
BE898990A true BE898990A (en) 1984-08-22

Family

ID=19841468

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/212445A BE898990A (en) 1983-02-24 1984-02-22 DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL INTO A TWO-LEVEL SIGNAL

Country Status (6)

Country Link
JP (1) JPS59161973A (en)
BE (1) BE898990A (en)
DE (1) DE3403792A1 (en)
FR (1) FR2541838B1 (en)
GB (1) GB2135852B (en)
NL (1) NL8300686A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0681258B2 (en) * 1988-12-05 1994-10-12 三菱電機株式会社 Image data binarization circuit
JP2809447B2 (en) * 1989-01-21 1998-10-08 株式会社リコー Image processing device
JPH05244419A (en) * 1991-11-25 1993-09-21 Eastman Kodak Co System and method for deciding 2-gray scale adaptive threshold value
FR2812985B1 (en) 2000-08-11 2003-08-22 Atmel Grenoble Sa DEMODULATION CIRCUIT OF A LOGIC SIGNAL TRANSMITTED BY ANALOGUE CHANNELS

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE323559C (en) * 1919-03-18 1920-07-29 Oscar Mey Device for the arbitrary selection of the workers to be checked in industrial and commercial enterprises
US3500073A (en) * 1966-09-15 1970-03-10 Phonocopy Inc Analog to binary signal processor
US3566281A (en) * 1968-05-21 1971-02-23 Ibm Electric pulse wave clipping circuitry
CA974607A (en) * 1971-12-13 1975-09-16 Bendix Corporation (The) System for converting modulated signals to squarewave outputs
US3869698A (en) * 1973-11-29 1975-03-04 Mohawk Data Sciences Corp Optical character recognition video amplifier and digitizer
FR2437125A1 (en) * 1978-09-21 1980-04-18 Cit Alcatel DEVICE FOR PROCESSING AN IMAGE ANALYSIS SIGNAL

Also Published As

Publication number Publication date
FR2541838B1 (en) 1987-10-09
JPS59161973A (en) 1984-09-12
JPH0439828B2 (en) 1992-06-30
GB2135852B (en) 1987-05-07
DE3403792A1 (en) 1984-08-30
GB8404411D0 (en) 1984-03-28
FR2541838A1 (en) 1984-08-31
GB2135852A (en) 1984-09-05
NL8300686A (en) 1984-09-17

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN

Effective date: 19920228