FR2398352A1 - Circuit de lecture optique - Google Patents
Circuit de lecture optiqueInfo
- Publication number
- FR2398352A1 FR2398352A1 FR7819404A FR7819404A FR2398352A1 FR 2398352 A1 FR2398352 A1 FR 2398352A1 FR 7819404 A FR7819404 A FR 7819404A FR 7819404 A FR7819404 A FR 7819404A FR 2398352 A1 FR2398352 A1 FR 2398352A1
- Authority
- FR
- France
- Prior art keywords
- reading circuit
- optical reading
- signal
- contrast
- center cell
- 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
-
- 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)
- Image Analysis (AREA)
- Character Input (AREA)
- Image Input (AREA)
- Automatic Focus Adjustment (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
Circuit de lecture optique. Le détecteur comprend un réseau de cellules photosensibles dont les signaux sont envoyés dans un registre à décalage. Un sous-réseau de 5 cellules sur 9 est formé par des sorties de ce registre recevant chacune une pondération spécifique. Le signal de la cellule centrale du sous-réseau avec une pondération unité est comparé à des sommations d'autres signaux pondérés de façon à déterminer si cette cellule centrale a enregistré un signal << blanc >> ou << noir >>. Ceci permet de tenir compte des facteurs de contraste et d'éviter les erreurs dues à un contraste trop faible. Peut être utilisé en particulier dans les détecteurs optiques pouvant être manipulés à la main.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/817,465 US4119947A (en) | 1977-07-20 | 1977-07-20 | Optical signal processor |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2398352A1 true FR2398352A1 (fr) | 1979-02-16 |
FR2398352B1 FR2398352B1 (fr) | 1984-05-04 |
Family
ID=25223145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7819404A Granted FR2398352A1 (fr) | 1977-07-20 | 1978-06-20 | Circuit de lecture optique |
Country Status (5)
Country | Link |
---|---|
US (1) | US4119947A (fr) |
JP (1) | JPS59872B2 (fr) |
DE (1) | DE2823679A1 (fr) |
FR (1) | FR2398352A1 (fr) |
GB (1) | GB1598596A (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5537092A (en) * | 1978-09-05 | 1980-03-14 | Ibm | Mode switch for setting threshold value |
FR2466153A1 (fr) * | 1979-09-21 | 1981-03-27 | Thomson Csf | Dispositif de decision noir ou blanc a seuil autoadaptatif pour systeme d'analyse de document et emetteur de telecopie comportant un tel dispositif |
US4298858A (en) * | 1980-03-27 | 1981-11-03 | The United States Of America As Represented By The Secretary Of The Air Force | Method and apparatus for augmenting binary patterns |
US4339745A (en) * | 1980-05-14 | 1982-07-13 | General Electric Company | Optical character recognition |
DE3019836A1 (de) * | 1980-05-23 | 1982-01-21 | Siemens AG, 1000 Berlin und 8000 München | Verfahren zum automatischen erkennen von bild- und text- oder graphikbereichen auf druckvorlagen |
FR2484111B1 (fr) * | 1980-06-06 | 1986-05-09 | Thomson Csf | Dispositif d'analyse optique d'un document et circuit de filtrage destine a un tel dispositif |
US4509195A (en) * | 1981-01-05 | 1985-04-02 | Morton Nadler | Process and device for the binarization of a pattern |
ES2140825T3 (es) * | 1995-01-31 | 2000-03-01 | United Parcel Service Inc | Procedimiento y aparato para separar el primer plano del fondo en imagenes que contienen texto. |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3496541A (en) * | 1961-08-28 | 1970-02-17 | Farrington Electronics Inc | Apparatus for recognizing characters by scanning them to derive electrical signals |
US3701099A (en) * | 1971-06-08 | 1972-10-24 | Ibm | Dynamic discrimination reference level generator for a parallel channel optical document scanner |
US3737855A (en) * | 1971-09-30 | 1973-06-05 | Ibm | Character video enhancement system |
US3747066A (en) * | 1971-08-23 | 1973-07-17 | Ocr Syst Inc | Optical scanner and signal processing system |
DE2634332A1 (de) * | 1975-08-01 | 1977-02-03 | Hitachi Ltd | Analog-digital-umsetzer mit variabler schwellenhoehe |
FR2330084A1 (fr) * | 1975-11-03 | 1977-05-27 | Elsag | Systeme electronique pour la lecture de symboles |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL268306A (fr) * | 1957-05-17 | |||
US3159815A (en) * | 1961-11-29 | 1964-12-01 | Ibm | Digitalization system for multi-track optical character sensing |
US3484747A (en) * | 1965-06-07 | 1969-12-16 | Recognition Equipment Inc | Digital-analog retina output conditioning |
US3889234A (en) * | 1972-10-06 | 1975-06-10 | Hitachi Ltd | Feature extractor of character and figure |
-
1977
- 1977-07-20 US US05/817,465 patent/US4119947A/en not_active Expired - Lifetime
-
1978
- 1978-05-12 GB GB19330/78A patent/GB1598596A/en not_active Expired
- 1978-05-31 DE DE19782823679 patent/DE2823679A1/de active Granted
- 1978-06-20 FR FR7819404A patent/FR2398352A1/fr active Granted
- 1978-06-26 JP JP53076609A patent/JPS59872B2/ja not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3496541A (en) * | 1961-08-28 | 1970-02-17 | Farrington Electronics Inc | Apparatus for recognizing characters by scanning them to derive electrical signals |
US3701099A (en) * | 1971-06-08 | 1972-10-24 | Ibm | Dynamic discrimination reference level generator for a parallel channel optical document scanner |
US3747066A (en) * | 1971-08-23 | 1973-07-17 | Ocr Syst Inc | Optical scanner and signal processing system |
US3737855A (en) * | 1971-09-30 | 1973-06-05 | Ibm | Character video enhancement system |
DE2634332A1 (de) * | 1975-08-01 | 1977-02-03 | Hitachi Ltd | Analog-digital-umsetzer mit variabler schwellenhoehe |
FR2330084A1 (fr) * | 1975-11-03 | 1977-05-27 | Elsag | Systeme electronique pour la lecture de symboles |
Non-Patent Citations (1)
Title |
---|
EXBK/75 * |
Also Published As
Publication number | Publication date |
---|---|
JPS59872B2 (ja) | 1984-01-09 |
DE2823679A1 (de) | 1979-02-01 |
GB1598596A (en) | 1981-09-23 |
US4119947A (en) | 1978-10-10 |
JPS5422130A (en) | 1979-02-19 |
DE2823679C2 (fr) | 1987-07-02 |
FR2398352B1 (fr) | 1984-05-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |