FR2425780A1 - Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image - Google Patents

Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image

Info

Publication number
FR2425780A1
FR2425780A1 FR7814216A FR7814216A FR2425780A1 FR 2425780 A1 FR2425780 A1 FR 2425780A1 FR 7814216 A FR7814216 A FR 7814216A FR 7814216 A FR7814216 A FR 7814216A FR 2425780 A1 FR2425780 A1 FR 2425780A1
Authority
FR
France
Prior art keywords
analysis signal
nothing
self
decision threshold
modulation
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
FR7814216A
Other languages
English (en)
Other versions
FR2425780B1 (fr
Inventor
Jean-Claude Decuyper
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.)
Nokia Inc
Original Assignee
Nokia 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 Nokia Inc filed Critical Nokia Inc
Priority to FR7814216A priority Critical patent/FR2425780A1/fr
Priority to BE1/9371A priority patent/BE875863A/fr
Priority to DE19792918318 priority patent/DE2918318A1/de
Priority to NL7903558A priority patent/NL7903558A/xx
Priority to GB7915779A priority patent/GB2020942B/en
Priority to LU81244A priority patent/LU81244A1/fr
Priority to CA327,576A priority patent/CA1126389A/fr
Priority to IT68006/79A priority patent/IT1118664B/it
Priority to JP5855979A priority patent/JPS54149511A/ja
Priority to US06/038,142 priority patent/US4247873A/en
Publication of FR2425780A1 publication Critical patent/FR2425780A1/fr
Application granted granted Critical
Publication of FR2425780B1 publication Critical patent/FR2425780B1/fr
Granted legal-status Critical Current

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/04—Measuring peak values or amplitude or envelope of AC or of pulses
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/28—Quantising the image, e.g. histogram thresholding for discrimination between background and foreground patterns

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Analogue/Digital Conversion (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

L'INVENTION CONCERNE UN CONVERTISSEUR AUTO-ADAPTATIF EN TOUT OU RIEN D'UN SIGNAL ANALOGIQUE D'ANALYSE D'IMAGE FONCTIONNANT PAR COMPARAISON DU SIGNAL D'ANALYSE AVEC UN SEUIL DE DECISION ET CORRECTION RELATIVE PREALABLE DU SEUIL DE DECISION ET DES NIVEAUX DE MODULATION DU SIGNAL D'ANALYSE A PARTIR D'UNE DETECTION DES CRETES DE MODULATION DU SIGNAL D'ANALYSE. SELON L'INVENTION, CHACUNE DES VALEURS DE CRETE DETECTEE SUCCESSIVEMENT EST TRAITEE EN LUI APPLIQUANT UNE DECROISSANCE LENTE PUIS UNE DECROISSANCE RAPIDE SI LE NIVEAU DE MODULATION SE MAINTIENT A UN NIVEAU INFERIEUR AU SEUIL DE DECISION PENDANT UNE DUREE CORRESPONDANT A UNE DIZAINE DE POINTS D'IMAGE REPRESENTES DANS LE SIGNAL D'ANALYSE. APPLICATION: TRANSMISSION DE SIGNAUX DE FAC-SIMILES.
FR7814216A 1978-05-12 1978-05-12 Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image Granted FR2425780A1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
FR7814216A FR2425780A1 (fr) 1978-05-12 1978-05-12 Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image
BE1/9371A BE875863A (fr) 1978-05-12 1979-04-26 Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image
NL7903558A NL7903558A (nl) 1978-05-12 1979-05-07 Inrichting, met automatische aanpassing, voor de om- zetting van een beeldanalysesignaal in tweezinnig signaal.
DE19792918318 DE2918318A1 (de) 1978-05-12 1979-05-07 Autoadaptativer analog-digitalwandler fuer die bildanalyse
GB7915779A GB2020942B (en) 1978-05-12 1979-05-08 Self-adaptive two valve converter of an analogue image analysis signal
LU81244A LU81244A1 (fr) 1978-05-12 1979-05-10 Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image
CA327,576A CA1126389A (fr) 1978-05-12 1979-05-11 Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image
IT68006/79A IT1118664B (it) 1978-05-12 1979-05-11 Convertitore autoadattivo in tutto o niente per signali di analisi di un immagine particolarmente di facsimile
JP5855979A JPS54149511A (en) 1978-05-12 1979-05-11 Automatic picture analysis signal existence adaptive converter
US06/038,142 US4247873A (en) 1978-05-12 1979-05-11 Self-adaptive, all-or-nothing converter of an analog image analysis signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7814216A FR2425780A1 (fr) 1978-05-12 1978-05-12 Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image

Publications (2)

Publication Number Publication Date
FR2425780A1 true FR2425780A1 (fr) 1979-12-07
FR2425780B1 FR2425780B1 (fr) 1980-09-05

Family

ID=9208214

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7814216A Granted FR2425780A1 (fr) 1978-05-12 1978-05-12 Convertisseur auto-adaptatif en tout ou rien d'un signal d'analyse d'image

Country Status (10)

Country Link
US (1) US4247873A (fr)
JP (1) JPS54149511A (fr)
BE (1) BE875863A (fr)
CA (1) CA1126389A (fr)
DE (1) DE2918318A1 (fr)
FR (1) FR2425780A1 (fr)
GB (1) GB2020942B (fr)
IT (1) IT1118664B (fr)
LU (1) LU81244A1 (fr)
NL (1) NL7903558A (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4337455A (en) * 1978-04-21 1982-06-29 Caere Corporation Apparatus for processing video signals received from an optical scanner
US4399469A (en) * 1980-04-23 1983-08-16 American Hoechst Corporation Imaging system and method with improved boundary detection
JPS5784670A (en) * 1980-11-17 1982-05-27 Fujitsu Ltd Video signal read-in system
JPS57188177A (en) * 1981-05-15 1982-11-19 Fuji Xerox Co Ltd Picture signal processing device
US4442544A (en) * 1981-07-09 1984-04-10 Xerox Corporation Adaptive thresholder
JPS5873280A (ja) * 1981-10-27 1983-05-02 Hitachi Ltd 信号２値化処理装置
US4674126A (en) * 1983-09-12 1987-06-16 Canon Kabushiki Kaisha Image signal processing apparatus
SE8404576L (sv) * 1983-09-23 1985-03-24 American Telephone & Telegraph Detaljdetektor for maskinvideo
JPS6079480A (ja) * 1983-10-07 1985-05-07 Fuji Xerox Co Ltd 画信号判別回路
US4600951A (en) * 1983-12-20 1986-07-15 At&T Technologies, Inc. Scanning sample, signal generation, data digitizing and retiming system
EP0360920B1 (fr) * 1988-09-30 1994-09-21 Computer Gesellschaft Konstanz Mbh Circuit pour obtenir le niveau de blanc pour le quantification en noir/blanc de signaux de balayage de photosenseurs simples
JPH02126771A (ja) * 1988-11-07 1990-05-15 Aisin Seiki Co Ltd 画像情報の２値化方法および装置
US5377282A (en) * 1991-09-19 1994-12-27 International Business Machines Corporation Optical inspection system utilizing dynamic analog-to-digital thresholding
US5396280A (en) * 1993-02-26 1995-03-07 International Business Machines, Corporation Analog video processing apparatus and method for eliminating background levels in the analog signal
ATA104797A (de) * 1997-06-17 1998-11-15 Siemens Ag Oesterreich Schaltungsanordnung zur binarisierung optischer muster

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2223701A1 (en) * 1973-03-30 1974-10-25 Thomson Csf T Vt Sa Signal processor for document analysis - detects the waveform gradients using electronic cct. with AND-NOT gates
US3912943A (en) * 1974-08-09 1975-10-14 Ibm Video thresholder

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3415950A (en) * 1965-03-29 1968-12-10 Ibm Video quantizing system
US3534334A (en) 1967-06-20 1970-10-13 Ibm Automatic control of a threshold in the digitization of an analog signal
GB1383740A (en) 1971-02-25 1974-02-12 Image Analysing Computers Ltd Detection devices for image analysis systems
US3723649A (en) * 1971-04-27 1973-03-27 Electronic Image Syst Corp Adaptive binary state decision system
US3696253A (en) * 1971-06-07 1972-10-03 Bell Telephone Labor Inc Peak-to-peak alternating current signal detector
US3934136A (en) * 1974-05-06 1976-01-20 Minnesota Mining And Manufacturing Company Threshold signal circuitry for scanning apparatus
US4001500A (en) * 1974-11-21 1977-01-04 Xerox Corporation Amplifier for use in a document scanning system
US3976833A (en) * 1974-11-21 1976-08-24 Xerox Corporation Amplifier back-ground control apparatus for use in a document scanning system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2223701A1 (en) * 1973-03-30 1974-10-25 Thomson Csf T Vt Sa Signal processor for document analysis - detects the waveform gradients using electronic cct. with AND-NOT gates
US3912943A (en) * 1974-08-09 1975-10-14 Ibm Video thresholder

Also Published As

Publication number Publication date
IT1118664B (it) 1986-03-03
US4247873A (en) 1981-01-27
FR2425780B1 (fr) 1980-09-05
CA1126389A (fr) 1982-06-22
GB2020942B (en) 1982-10-27
BE875863A (fr) 1979-10-26
NL7903558A (nl) 1979-11-14
JPS54149511A (en) 1979-11-22
LU81244A1 (fr) 1979-12-07
DE2918318A1 (de) 1979-11-15
IT7968006A0 (it) 1979-05-11
GB2020942A (en) 1979-11-21

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