FR2444977A1 - Circuit de detection autoregulateur - Google Patents

Circuit de detection autoregulateur

Info

Publication number
FR2444977A1
FR2444977A1 FR7930850A FR7930850A FR2444977A1 FR 2444977 A1 FR2444977 A1 FR 2444977A1 FR 7930850 A FR7930850 A FR 7930850A FR 7930850 A FR7930850 A FR 7930850A FR 2444977 A1 FR2444977 A1 FR 2444977A1
Authority
FR
France
Prior art keywords
self
marking point
microfilm
value
difference value
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
FR7930850A
Other languages
English (en)
Other versions
FR2444977B3 (fr
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.)
VISUAL SYSTEMS CORP
Original Assignee
VISUAL SYSTEMS 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 VISUAL SYSTEMS CORP filed Critical VISUAL SYSTEMS CORP
Publication of FR2444977A1 publication Critical patent/FR2444977A1/fr
Application granted granted Critical
Publication of FR2444977B3 publication Critical patent/FR2444977B3/fr
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
    • G06K17/0016—Selecting or retrieving of images by means of their associated code-marks, e.g. coded microfilm or microfiche
    • G06K17/0019—Selecting or retrieving of images by means of their associated code-marks, e.g. coded microfilm or microfiche for images on filmstrips

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Image Analysis (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

La présente invention concerne un circuit pour détecter optiquement la présence des points de marquage apposés sur les images d'un microfilm, indépendamment des marques parasites et noircissures portées par le microfilm. Une première fonction d'autorégulation permet de former pour chaque image, par précalage, une valeur de fond absolue à partir du signal formé par un phototransistor recevant la lumière d'une source à travers le microfilm en dehors du point de marquage. On mesure, pour chaque image et à partir de la valeur de fond, la valeur de différence présentée par le signal au passage de chaque point de marquage. Un point de marquage n'est authentifié que si la valeur de différence est supérieure à une valeur de seuil prédéterminée. La valeur de seuil est autorégulée et égale à une partie de la valeur de différence correspondant au dernier point de marquage authentifié.
FR7930850A 1978-12-18 1979-12-17 Circuit de detection autoregulateur Granted FR2444977A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/970,228 US4219737A (en) 1978-12-18 1978-12-18 Self regulating microfilm frame detection circuit

Publications (2)

Publication Number Publication Date
FR2444977A1 true FR2444977A1 (fr) 1980-07-18
FR2444977B3 FR2444977B3 (fr) 1981-04-17

Family

ID=25516620

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7930850A Granted FR2444977A1 (fr) 1978-12-18 1979-12-17 Circuit de detection autoregulateur

Country Status (5)

Country Link
US (1) US4219737A (fr)
JP (1) JPS55112611A (fr)
DE (1) DE2951441A1 (fr)
FR (1) FR2444977A1 (fr)
GB (1) GB2040446A (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5945184A (ja) * 1982-09-09 1984-03-13 Sony Corp 熱昇華型感熱転写記録インクリボン
GB2143636A (en) * 1983-07-22 1985-02-13 Stephen Kenneth Buss A circuit arrangement and method for detecting markers in a microfilm scanner
CH664225A5 (de) * 1984-07-20 1988-02-15 Alos Ag Vorrichtung zum detektieren von optischen zeichen auf einem relativ zur vorrichtung bewegten filmtraeger.
US5137347A (en) * 1988-02-16 1992-08-11 Canon Kabushiki Kaisha Information retrieval apparatus
JPH01263637A (ja) * 1988-04-15 1989-10-20 Fuji Photo Film Co Ltd 写真フイルムの位置情報読取装置
JP2505528B2 (ja) * 1988-04-28 1996-06-12 富士写真フイルム株式会社 写真フイルムのバ―コ―ド読取装置
US5268563A (en) * 1988-04-28 1993-12-07 Fuji Photo Film Co., Ltd. Device for reading bar codes on photographic film
JP2892867B2 (ja) * 1991-08-23 1999-05-17 キヤノン株式会社 マーク検出装置
JP3250691B2 (ja) * 1993-06-30 2002-01-28 富士写真フイルム株式会社 マイクロフィルムリーダの画像傾き検出方法
JP4150942B2 (ja) * 1998-03-11 2008-09-17 ソニー株式会社 指紋画像処理装置及び指紋画像処理方法
US9176011B2 (en) * 2013-03-06 2015-11-03 Microchip Technology Incorporated Single wire analog output sensor architecture
CN109254487B (zh) * 2018-09-17 2021-02-19 苏州佳世达光电有限公司 投影装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3328590A (en) * 1963-12-11 1967-06-27 Sylvania Electric Prod Automatic gain control for ambient light effects
US3660670A (en) * 1970-12-21 1972-05-02 Eastman Kodak Co Document detecting and counting apparatus
US3789215A (en) * 1972-09-08 1974-01-29 Ibm Photosensitive document detector with automatic compensation
US4027154A (en) * 1975-12-29 1977-05-31 Bell & Howell Company Electronic document detector circuitry with feedback control
DE2736297A1 (de) * 1977-08-12 1979-02-22 Licentia Gmbh Verfahren und vorrichtung zur einstellung des arbeitspunkts bei einer schaltungsanordnung zur abtastung von optisch feststellbaren markierungen

Also Published As

Publication number Publication date
GB2040446A (en) 1980-08-28
FR2444977B3 (fr) 1981-04-17
DE2951441A1 (de) 1980-07-03
US4219737A (en) 1980-08-26
JPS55112611A (en) 1980-08-30

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