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WO1992003808A1 - Dispositif de surveillance destine plus particulierement a etre utilise pour voir les plaques mineralogiques des vehicules - Google Patents

Dispositif de surveillance destine plus particulierement a etre utilise pour voir les plaques mineralogiques des vehicules Download PDF

Info

Publication number
WO1992003808A1
WO1992003808A1 PCT/GB1991/001405 GB9101405W WO9203808A1 WO 1992003808 A1 WO1992003808 A1 WO 1992003808A1 GB 9101405 W GB9101405 W GB 9101405W WO 9203808 A1 WO9203808 A1 WO 9203808A1
Authority
WO
WIPO (PCT)
Prior art keywords
camera
light
illuminator
pulses
plates
Prior art date
Application number
PCT/GB1991/001405
Other languages
English (en)
Inventor
Philip Galbraith
Richard James Harris
Original Assignee
The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland
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 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland filed Critical The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland
Priority to BR919106764A priority Critical patent/BR9106764A/pt
Priority to JP3513975A priority patent/JPH06503662A/ja
Publication of WO1992003808A1 publication Critical patent/WO1992003808A1/fr
Priority to GB939302128A priority patent/GB9302128D0/en
Priority to FI930681A priority patent/FI930681L/fi
Priority to KR1019930700452A priority patent/KR930701801A/ko
Priority to NO93930553A priority patent/NO930553L/no

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
    • G08G1/054—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed photographing overspeeding vehicles
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
    • G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors

Definitions

  • This invention relates to surveillance apparatus which is particularly intended for use in viewing vehicle numoer-plates in covert night-surveillance operations.
  • a surveillance apparatus comprising an illuminator for emitting a series of high-energy pulses of light, and a camera operating in synchronism with the illumina ⁇ tor to receive said nulses of light.
  • this light is infra-red light outside the range visible to the human eye; in the infra-red (IR) range of the spectrum, light is invisible to the human eye at 940nm or 880nm or possibly 820nm, and light-radiation of these wavelen chs can be provided by suitable LED or laser sources.
  • said illuminator comprises an array of light- emitting diodes (LEDs) or a source of laser light
  • said camera comprises a shuttered TV camera which will usually be of miniature size.
  • the illuminator and the (miniature) camera may be combined in a small package, which is attractive to covert sur ⁇ veillance operations, and it is preferred to position the illuminator close to the camera lens so as to minimise the included angle between incident and reflected light.
  • the TV camera is of t e (usual) kind which receives visible light, it is desirable to provide for adjustable back-focus to accommodate the difference between the focal points of the camera lens for visible light and for IR light.
  • Figure 1 is a graph showing ( ⁇ m) wavelengths of light emitted from a conventional incandescent light source having a filament temperature of about 3000°K,
  • Figure 2 is a similar graph showing the wavelengths of (I.R.) light emitted from a 940nm illuminator; and, Figure 3 is a diagramatic view showing apparatus according to the present invention for viewing or reading vehicle number-plates, and illustrating the operation of the apparatus.
  • the light energy transmitted from a source 10 such as the 3000 * K bulb ( Figure 1) contains a substantial degree of visible light, and some IR light.
  • a source 10 such as the 3000 * K bulb
  • the light energy is conventionally in the range of about 840 to lOOOnm; LEDs suitable for the present invention have a centre wavelength of 940nm or 880nm, with a spectral width of, typically, 50nm ( Figure 2).
  • the apparatus comprises the illuminator or light-energy source 10 which, suitably, has an array of standard 940nm LEDs transmitting IR light which is invisible to the human eye, as indicated above with reference to Figure 2.
  • the array may comprise about 40 to 400 LEDs, depending on the required specification of the apparatus, and one LED which has proved satisfac ⁇ tory is the AEG TSIP5201 having a continuous rating of 00mA.
  • a camera 12 is employed in conjunction with the LED illum ⁇ inator, in viewing a car number-plate 13, and has electri ⁇ cal connection 14 with the illuminator.
  • the camera com ⁇ prises a shuttered TV camera having a CCD sensor which is sensitive to IR light, behind a lens unit 15, and records and/or transmits to a possibly-remote V monitor (not shown) video signals derived from the illumination of the number-plate by the LED array 11.
  • a 'shuttered' TV camera has an integration time (while picture inform ⁇ ation is being accumulated) which is shorter than its field period.
  • Shuttering may be achieved electronically or mechanically, or by means of an electro-optical shut ⁇ ter, but it is preferable that the shuttering operation is silent, as occurs with electronic shuttering.
  • the standard 50 per second, field periods for a (U.K.) TV camera are 20mS, but the camera may be shuttered to 1mS for each field which would result in the camera registering only 1/20 of the total light-energy from a broadband continuous source operating for 20mS.
  • the camera can receive a comparable amount of energy during each shuttering period.
  • the aforementioned LEDs TSIP5201 have a cont ⁇ inuous rating of 100mA, but the driving circuits in the illuminator 10 feed high-energy pulses of about 1000mA, or possibly more, at a rate of 50 pulses per second with each pulse having a duration of 1mS; as a result, the camera receives at least 50% of the energy from broadband illumination without the restriction of shuttering.
  • a rate of 60 pulses per second would be appropriate if, for example, U.S. system TV monitors were to be employed with U.S. system cameras (12).
  • the focal point of any lens, for IR light lies behind the focal point for visible light.
  • the PEARPOINT P176 camera is particularly suitable for use in the apparatus of the present invent ⁇ ion, as it incorporates motorised back-focus which facil ⁇ itates initial set up for each operation; this camera also provides high sensitivity, extended IR sensitivity up to 1100nm, high resolution and a selectable (on/off) shutter.
  • the LEDs emit high energy due to high-peak 1000mA pulses of a duration of about ImS in synchronism with the cameras "open" periods of 1mS.
  • This illumination is sufficient for reading car number- plates at night, under normal conditions.
  • the disadvan ⁇ tage which car headlamps can cause is substantially reduced as the level of energy received by the camera from the steady light produced by the headlamps during each period of 1mS, effectively of chopped waveform, is much less than the energy level received during those periods from the high-peak pulses generated by the LEDs.
  • a band-pass filter may be introduced into the optical path 16 to the camera; this filter is centered on the peak output wavelength of the LEDs (in the IR band) and has a bandwidth which passes most of the LED energy but rejects light of other wavelengths such as the remai ⁇ ning energy emitted from t ⁇ e broadband vehicle headlamps.
  • the light energy fed to the camera by the LED pulses can be changed on a field-by-field basis, to provide images of the number-plate which will then appear brighter or dimmer. These images are produced at very short intervals of time, and may subsequently be selected to facilitate the reading of a number-plate which may be unclear due to poor reflectivity caused by, for exam ⁇ ple, dirt on the plate.
  • the camera will usually have a fixed iris, and the pulse energy may be changed by varying amplitude or duration, and it is to be noted that reduction of duration, say from 1mS in stages to 0.3mS, has the added advantage of reducing possible blurring caused by movement of the vehicle.
  • the camera shuttering time may be changed on a field- by-field basis, to reduce yet further the counter-effect of headlamps.
  • Vehicle number-plates (12) in many countries including U.K. are of a type which give very high reflectance, provided that the illuminator 10 and camera 12 are very close together. As shown in Figure 3, appropriate arrange ⁇ ment of the illuminator array 11 and the camera lens 15 can reduce below 5° the included angle ⁇ between the incident beam 17 and the reflected beam 16. This narrow angle can result in a reduction in the amount of illumination required.
  • the apparatus is useful in viewing vehicle number-plates during the dark, and also during dawn and dusk, and may operate continuously to cover daylight hours. It will be appreciated that, for daylight use, and also in non-covert operations such as traffic surveys, the question of visibility may be of little importance and pulsed illuminators in the spectral bands of wavelengths shorter than IR may be employed.
  • the illuminator and TV camera can be of small size, possibly packaged in the form of a cube having sides of the order of 100mm.
  • the power required for the LED illuminator may be as low as 7 or 8 watts and, operating at 12 volts, permits battery operation.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)
  • Stroboscope Apparatuses (AREA)
  • Traffic Control Systems (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

Dispositif de surveillance destiné plus particulièrement à voir les plaques minéralogiques des véhicules au cours d'opérations effectuées de nuit et en secret, ledit dispositif comprenant une source lumineuse (10) pourvue d'un système de diodes (11) électroluminescentes ou d'une source de lumière laser, et une caméra de télévision fermée, de préférence miniature. La source lumineuse émet une série d'impulsions à crêtes élevées de lumière infra-rouge (17) située hors de la gamme visible par l'÷il humain, qui sont réfléchies par la plaque minéralogique et que reçoit la caméra qui fonctionne en synchronisme avec la source lumineuse. On place, de préférence, la source lumineuse (10) près de l'objectif de la caméra (15) afin de minimiser l'angle de dégagement (Υ) existant entre la lumière incidente (17) et la lumière réfléchie (16).
PCT/GB1991/001405 1990-08-17 1991-08-19 Dispositif de surveillance destine plus particulierement a etre utilise pour voir les plaques mineralogiques des vehicules WO1992003808A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BR919106764A BR9106764A (pt) 1990-08-17 1991-08-19 Aparelho de vigilancia e aparelho para observacao de placas numericas de veiculo em operacoes de vigilancia noturna escondidas
JP3513975A JPH06503662A (ja) 1990-08-17 1991-08-19 特に自動車ナンバープレートの観察に使用するための監視装置
GB939302128A GB9302128D0 (en) 1990-08-17 1993-02-03 Surveillance apparatus particularly for use in viewing vehicle number-plates
FI930681A FI930681L (fi) 1990-08-17 1993-02-16 Saerskilt foer granskning av registerplaotarna pao fordon avsedd oevervakningsanordning
KR1019930700452A KR930701801A (ko) 1990-08-17 1993-02-17 차량용 번호판 관찰용 감시장치
NO93930553A NO930553L (no) 1990-08-17 1993-02-17 Overvaakningsanordning, saerlig for betraktning av kjoeretoeynummerskilt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9018174.4 1990-08-17
GB909018174A GB9018174D0 (en) 1990-08-17 1990-08-17 Apparatus for reading vehicle number-plates

Publications (1)

Publication Number Publication Date
WO1992003808A1 true WO1992003808A1 (fr) 1992-03-05

Family

ID=10680886

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001405 WO1992003808A1 (fr) 1990-08-17 1991-08-19 Dispositif de surveillance destine plus particulierement a etre utilise pour voir les plaques mineralogiques des vehicules

Country Status (10)

Country Link
EP (1) EP0543904A1 (fr)
JP (1) JPH06503662A (fr)
KR (1) KR930701801A (fr)
AU (1) AU8409091A (fr)
BR (1) BR9106764A (fr)
CA (1) CA2089356A1 (fr)
FI (1) FI930681L (fr)
GB (3) GB9018174D0 (fr)
HK (1) HK1007042A1 (fr)
WO (1) WO1992003808A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013023A1 (fr) * 1994-10-24 1996-05-02 Combitech Traffic Systems Ab Dispositif destine a l'identification de vehicules au niveau d'une station de controle
US6832728B2 (en) 2001-03-26 2004-12-21 Pips Technology, Inc. Remote indicia reading system
US6902299B2 (en) 2003-02-27 2005-06-07 Cantronic Systems Inc. Long distance illuminator
US8218822B2 (en) 2007-05-14 2012-07-10 Pips Technology, Inc. Apparatus and method for recognizing the state of origin of a vehicle license plate
US8842182B2 (en) 2009-12-22 2014-09-23 Leddartech Inc. Active 3D monitoring system for traffic detection
KR101452004B1 (ko) * 2006-09-25 2014-10-22 토니 메이어 미세회절 감시용 조명장치
US8908159B2 (en) 2011-05-11 2014-12-09 Leddartech Inc. Multiple-field-of-view scannerless optical rangefinder in high ambient background light
US9235988B2 (en) 2012-03-02 2016-01-12 Leddartech Inc. System and method for multipurpose traffic detection and characterization
US9378640B2 (en) 2011-06-17 2016-06-28 Leddartech Inc. System and method for traffic side detection and characterization
US10488492B2 (en) 2014-09-09 2019-11-26 Leddarttech Inc. Discretization of detection zone
USRE49342E1 (en) 2007-12-21 2022-12-20 Leddartech Inc. Distance detection method and system

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2257257A (en) * 1991-06-21 1993-01-06 Christopher Ian Hughes Security apparatus
DE4225074C1 (de) * 1992-07-29 1994-02-03 Nsm Ag Vorrichtung zur Steuerung des Verschlusses einer von einer Lichtquelle mit Licht beaufschlagten CCD-Kamera
FR2749117B1 (fr) * 1996-05-21 1998-07-31 Christophel Claude Camera video notamment destinee a la telesurveillance dans l'obscurite
JP2000339589A (ja) 1999-05-25 2000-12-08 Fujitsu Ltd 車両の交通安全補助システムおよび記録媒体
GB2354898B (en) * 1999-07-07 2003-07-23 Pearpoint Ltd Vehicle licence plate imaging
FR2797081B1 (fr) * 1999-07-29 2002-10-31 Positive Procede d'identification d'un vehicule automobile immatricule et appareil d'identification de vehicule automobile correspondant
GB9927623D0 (en) * 1999-11-24 2000-01-19 Koninkl Philips Electronics Nv Illumination source
JP3979499B2 (ja) * 2001-07-18 2007-09-19 ヒュンジャエ テック カンパニー リミテッド 監視車両を利用した被監視車両の車両番号の自動認識システム及び方法
IL160318A0 (en) 2001-08-16 2004-07-25 Optidtech Optical Identificati Electro-optic reader for retro-reflective bar codes
DE10205250B4 (de) * 2002-02-08 2006-11-09 Funkwerk Plettac Electronic Gmbh Optisches Bandsperrenfilter und elektronische Überwachungskamera mit einem solchen Filter
GB2404107A (en) * 2003-07-16 2005-01-19 British Broadcasting Corp Flash-based keying
US20120002045A1 (en) * 2007-08-08 2012-01-05 Mayer Tony Non-retro-reflective license plate imaging system
DE102007049637B4 (de) * 2007-10-17 2015-10-15 Audi Ag Verfahren zum Betreiben eines Leuchtsystems und eines Bilderfassungssystems eines Fahrzeugs sowie Objekterfassungssystem für ein Fahrzeug
GB201012178D0 (en) * 2010-07-20 2010-09-01 Telemactics Technology Llp Indicia identifying system

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0104437A2 (fr) * 1982-08-30 1984-04-04 Fiorello Sodi Appareillage pour relèvements et enregistrements d'infractions au code de la route avec emploi d'énergie de type lumineux dans les bandes contigues à la bande visible
GB2142738A (en) * 1983-07-02 1985-01-23 Shirley Developments Limited Stroboscope
EP0178015A1 (fr) * 1984-10-05 1986-04-16 Telecommunications Radioelectriques Et Telephoniques T.R.T. Systéme d'observation nocturne semi-actif à intensification de lumière

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DE3404396A1 (de) * 1984-02-08 1985-08-14 Dornier Gmbh, 7990 Friedrichshafen Vorrichtung und verfahren zur aufnahme von entfernungsbildern
EP0181412A1 (fr) * 1984-11-10 1986-05-21 Tele-Security-Foto Überwachungsanlagen GmbH Système de prise de vues de télévision
WO1987000384A1 (fr) * 1985-06-25 1987-01-15 Matsusita Electric Works, Ltd. Dispositif de surveillance utilisant la noctovision pour un systeme d'interphones
IT1221607B (it) * 1987-08-25 1990-07-12 Fiorello Sodi Impianto per la rilevazione e la registrazione di infrazioni alle regole di disciplina stradale,con l'impiego di laser
GB2212689B (en) * 1987-11-17 1992-01-02 Ferranti Plc Television camera system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0104437A2 (fr) * 1982-08-30 1984-04-04 Fiorello Sodi Appareillage pour relèvements et enregistrements d'infractions au code de la route avec emploi d'énergie de type lumineux dans les bandes contigues à la bande visible
GB2142738A (en) * 1983-07-02 1985-01-23 Shirley Developments Limited Stroboscope
EP0178015A1 (fr) * 1984-10-05 1986-04-16 Telecommunications Radioelectriques Et Telephoniques T.R.T. Systéme d'observation nocturne semi-actif à intensification de lumière

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996013023A1 (fr) * 1994-10-24 1996-05-02 Combitech Traffic Systems Ab Dispositif destine a l'identification de vehicules au niveau d'une station de controle
US6832728B2 (en) 2001-03-26 2004-12-21 Pips Technology, Inc. Remote indicia reading system
US6902299B2 (en) 2003-02-27 2005-06-07 Cantronic Systems Inc. Long distance illuminator
KR101452004B1 (ko) * 2006-09-25 2014-10-22 토니 메이어 미세회절 감시용 조명장치
US9202373B2 (en) 2006-09-25 2015-12-01 Bosch Security Systems Bv Micro-diffractive surveillance illuminator
US8218822B2 (en) 2007-05-14 2012-07-10 Pips Technology, Inc. Apparatus and method for recognizing the state of origin of a vehicle license plate
USRE49950E1 (en) 2007-12-21 2024-04-30 Leddartech Inc. Distance detection method and system
USRE49342E1 (en) 2007-12-21 2022-12-20 Leddartech Inc. Distance detection method and system
US8842182B2 (en) 2009-12-22 2014-09-23 Leddartech Inc. Active 3D monitoring system for traffic detection
USRE48763E1 (en) 2011-05-11 2021-10-05 Leddartech Inc. Multiple-field-of-view scannerless optical rangefinder in high ambient background light
USRE47134E1 (en) 2011-05-11 2018-11-20 Leddartech Inc. Multiple-field-of-view scannerless optical rangefinder in high ambient background light
US8908159B2 (en) 2011-05-11 2014-12-09 Leddartech Inc. Multiple-field-of-view scannerless optical rangefinder in high ambient background light
US9378640B2 (en) 2011-06-17 2016-06-28 Leddartech Inc. System and method for traffic side detection and characterization
USRE48914E1 (en) 2012-03-02 2022-02-01 Leddartech Inc. System and method for multipurpose traffic detection and characterization
US9235988B2 (en) 2012-03-02 2016-01-12 Leddartech Inc. System and method for multipurpose traffic detection and characterization
USRE50261E1 (en) 2012-03-02 2025-01-07 Leddartech Inc. System and method for multipurpose traffic detection and characterization
US10488492B2 (en) 2014-09-09 2019-11-26 Leddarttech Inc. Discretization of detection zone

Also Published As

Publication number Publication date
CA2089356A1 (fr) 1992-02-18
AU8409091A (en) 1992-03-17
GB9302128D0 (en) 1993-04-28
GB9018174D0 (en) 1990-10-03
FI930681A0 (fi) 1993-02-16
JPH06503662A (ja) 1994-04-21
KR930701801A (ko) 1993-06-12
HK1007042A1 (en) 1999-03-26
GB2248994A (en) 1992-04-22
GB2248994B (en) 1995-04-05
FI930681L (fi) 1993-02-16
EP0543904A1 (fr) 1993-06-02
GB9117967D0 (en) 1991-10-09
BR9106764A (pt) 1993-06-29

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