GB1281075A - Optical reading systems - Google Patents

Optical reading systems

Info

Publication number
GB1281075A
GB1281075A GB41862/69A GB4186269A GB1281075A GB 1281075 A GB1281075 A GB 1281075A GB 41862/69 A GB41862/69 A GB 41862/69A GB 4186269 A GB4186269 A GB 4186269A GB 1281075 A GB1281075 A GB 1281075A
Authority
GB
United Kingdom
Prior art keywords
document
mirror
character
multifacet
lens
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.)
Expired
Application number
GB41862/69A
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Publication of GB1281075A publication Critical patent/GB1281075A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06E—OPTICAL COMPUTING DEVICES; COMPUTING DEVICES USING OTHER RADIATIONS WITH SIMILAR PROPERTIES
    • G06E3/00—Devices not provided for in group G06E1/00, e.g. for processing analogue or hybrid data
    • G06E3/001—Analogue devices in which mathematical operations are carried out with the aid of optical or electro-optical elements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/88—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Multimedia (AREA)
  • Character Input (AREA)

Abstract

1281075 Character recognition COMPAGNIE FRANCAISE THOMSON HOUSTON-HOTCHKISS BRANDT 21 Aug 1969 [21 Aug 1968] 41862/69 Heading G4R In a character recognition system, the symbols on a document to be read are selected in turn by a multifacet rotary mirror and presented for simultaneous optical comparison with different reference characters, the highest correlation being detected by a unit having automatic threshold regulation. The comparison uses a correlator for each reference. Each correlator is followed by a respective lens and photodiode, the photodiodes feeding the unit referred to, which is transistorized, to identify the character to a computer which is also supplied with the character location. The multifacet mirror reflects each character in a line on the (stationary) document, in turn through a lens to an image multiplier, then the document is moved incrementally to bring the next line into position. Alternatively, the document is stationary throughout and an incrementally rotating mirror selects the lines in turn for supply to the multifacet mirror. Alternatively, the document moves continuously and the rotation axis of the multifacet mirror is skewed to compensate. Defocussing at the line ends is compensated by cyclic translation of the last-mentioned lens, or by using a corrector lens with a cylindrical curve adjacent the document, or by the document to a concave cylindrical surface by suction. The image multiplier uses plane mirrors arranged on a paraboloidal surface or lenses arranged on a spherical surface.
GB41862/69A 1968-08-21 1969-08-21 Optical reading systems Expired GB1281075A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR163628 1968-08-21

Publications (1)

Publication Number Publication Date
GB1281075A true GB1281075A (en) 1972-07-12

Family

ID=8653904

Family Applications (1)

Application Number Title Priority Date Filing Date
GB41862/69A Expired GB1281075A (en) 1968-08-21 1969-08-21 Optical reading systems

Country Status (4)

Country Link
DE (1) DE1939826A1 (en)
FR (1) FR1586433A (en)
GB (1) GB1281075A (en)
NL (1) NL6912737A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538413A1 (en) * 1984-12-29 1986-07-03 Jenoptik Jena Gmbh, Ddr 6900 Jena ARRANGEMENT FOR EVALUATING TWO-DIMENSIONAL OBJECT TEMPLATES
DE3810639A1 (en) * 1987-07-17 1989-01-26 Jenoptik Jena Gmbh MICROSCOPE ARRANGEMENT FOR PARALLEL VISUAL AND OPTOELECTRONIC ANALYSIS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538413A1 (en) * 1984-12-29 1986-07-03 Jenoptik Jena Gmbh, Ddr 6900 Jena ARRANGEMENT FOR EVALUATING TWO-DIMENSIONAL OBJECT TEMPLATES
DE3810639A1 (en) * 1987-07-17 1989-01-26 Jenoptik Jena Gmbh MICROSCOPE ARRANGEMENT FOR PARALLEL VISUAL AND OPTOELECTRONIC ANALYSIS

Also Published As

Publication number Publication date
NL6912737A (en) 1970-02-24
DE1939826A1 (en) 1970-11-19
FR1586433A (en) 1970-02-20

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee