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'imageInfo
- 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
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; CALCULATING OR 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)
- Measurement Of Current Or Voltage (AREA)
- Analogue/Digital Conversion (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.
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 |
DE19792918318 DE2918318A1 (de) | 1978-05-12 | 1979-05-07 | Autoadaptativer analog-digitalwandler fuer die bildanalyse |
NL7903558A NL7903558A (nl) | 1978-05-12 | 1979-05-07 | Inrichting, met automatische aanpassing, voor de om- zetting van een beeldanalysesignaal in tweezinnig signaal. |
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 |
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 |
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 |
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)
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)
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 (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3415950A (en) * | 1965-03-29 | 1968-12-10 | Ibm | Video quantizing system |
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 |
-
1978
- 1978-05-12 FR FR7814216A patent/FR2425780A1/fr active Granted
-
1979
- 1979-04-26 BE BE1/9371A patent/BE875863A/fr not_active IP Right Cessation
- 1979-05-07 DE DE19792918318 patent/DE2918318A1/de not_active Withdrawn
- 1979-05-07 NL NL7903558A patent/NL7903558A/xx not_active Application Discontinuation
- 1979-05-08 GB GB7915779A patent/GB2020942B/en not_active Expired
- 1979-05-10 LU LU81244A patent/LU81244A1/fr unknown
- 1979-05-11 CA CA327,576A patent/CA1126389A/fr not_active Expired
- 1979-05-11 US US06/038,142 patent/US4247873A/en not_active Expired - Lifetime
- 1979-05-11 JP JP5855979A patent/JPS54149511A/ja active Pending
- 1979-05-11 IT IT68006/79A patent/IT1118664B/it active
Patent Citations (2)
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 |
---|---|
NL7903558A (nl) | 1979-11-14 |
GB2020942B (en) | 1982-10-27 |
US4247873A (en) | 1981-01-27 |
CA1126389A (fr) | 1982-06-22 |
IT1118664B (it) | 1986-03-03 |
IT7968006A0 (it) | 1979-05-11 |
LU81244A1 (fr) | 1979-12-07 |
GB2020942A (en) | 1979-11-21 |
FR2425780B1 (fr) | 1980-09-05 |
DE2918318A1 (de) | 1979-11-15 |
BE875863A (fr) | 1979-10-26 |
JPS54149511A (en) | 1979-11-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |