WO1996029827A1 - Varied intensity and/or infrared auxiliary illumination of surveillance area - Google Patents

Varied intensity and/or infrared auxiliary illumination of surveillance area Download PDF

Info

Publication number
WO1996029827A1
WO1996029827A1 PCT/US1996/003333 US9603333W WO9629827A1 WO 1996029827 A1 WO1996029827 A1 WO 1996029827A1 US 9603333 W US9603333 W US 9603333W WO 9629827 A1 WO9629827 A1 WO 9629827A1
Authority
WO
WIPO (PCT)
Prior art keywords
source
view
field
illumination
light source
Prior art date
Application number
PCT/US1996/003333
Other languages
French (fr)
Inventor
Charles J. Tranchita
Paul D. LANG
Ronald B. Jones
Original Assignee
Northrop Grumman Corporation
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 Northrop Grumman Corporation filed Critical Northrop Grumman Corporation
Priority to AU53082/96A priority Critical patent/AU5308296A/en
Publication of WO1996029827A1 publication Critical patent/WO1996029827A1/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19634—Electrical details of the system, e.g. component blocks for carrying out specific functions
    • G08B13/19636—Electrical details of the system, e.g. component blocks for carrying out specific functions pertaining to the camera
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation

Definitions

  • This invention relates to enhancing the illumination of surveillance fields of view for video and/or photographic recording of activity, such as in the vicinity of automatic teller machines (ATMs) and other areas.
  • ATMs automatic teller machines
  • Disclosure of Invention Objects of the invention include provision of adequate illumination of the field of view of a surveillance recorder, and assurance of proper balance of illumination and sensitivity to yield a recognizable pattern of the recorded image of someone in the field of view of a surveillance recorder.
  • the field of surveillance recording including video records (both digital and analog) and photographic records will be referred to, for convenience only, as video records.
  • video records both digital and analog
  • photographic records will be referred to, for convenience only, as video records.
  • the field of view of a video camera utilized for security surveillance is illuminated with high intensity infrared radiation thereby to adequately illuminate objects and faces near the camera (such as a user or an attacker near an ATM), adequately to record the characteristics thereof despite the amount or variation in background illumination (such as from the sun and remote lighting) .
  • the intensity of illumination of a surveillance field of view is constantly varied with respect to time so that for any one subject, video records will be made at various levels of illumination, thereby enhancing the capability to distinguish features of the subject.
  • the illumination is varied as between bright and dark backgrounds, thereby assuring an adequate general level of illumination (in sunlight) without excessive illumination (at night).
  • the invention provides a much greater assurance of being able to recognize individuals in the field of a view of a video camera, both in daylight and at night, without unduly impairing the ability of subjects of the 5video record to see sufficiently to use an ATM machine and avoid threats in the area.
  • the invention is extremely simple and capable of being implemented in a variety of configurations to suit indoor and outdoor surveillance areas, in confined and open spaces, in lOexisting as well as new installations.
  • FIG. 1 is a simplified schematic block diagram of an exemplary embodiment of the invention.
  • Fig. 2 is a front elevation view of a camera lens 20employing the invention, taken on the line 2-2 of Fig. 1.
  • Fig. 3 is a simplified illustration of the timing of the embodiment of Fig. 1.
  • Fig. 4 is a stylized illustration of the invention viewing a surveillance object at an ATM.
  • a light source 10 which may be a laser diode or one or more LEDs, illuminates a plurality of optical fibers 11 which may be split so as to feed additional optical fibers 12, to conduct the
  • the source 10 may be an infrared laser, such as an Opto Power Corp. OPC-A001.
  • the optical fibers 12 may terminate in an annulus 13
  • the fibers may be selected from those readily available which have suitably shaped tips to provide about a 30° dispersion of radiation emanating from the tips thereof.
  • the infrared 5laser diode 10 may be operated in a manner to provide varying intensity of illumination by providing different operating voltages to it through selectively operated switches, such as a plurality of field effect transistor switches (FETs) 15-18, each applying a corresponding lOvoltage from a tap 21-24 of a voltage divider which includes a plurality of resistors 27-32 between a suitable DC source 33 and ground.
  • FETs field effect transistor switches
  • An oscillator 36 drives a counter 37, the output of which on a plurality of lines 38 is decoded by a decode
  • the voltage steps may be selected with respect to the particular source 10 used so as to provide correct variation of illumination, which may (in the example herein) range from 0.05 watts to 0.3 watts, as seen in Fig. 3.
  • the voltage steps may be selected with respect to the particular source 10 used so as to provide correct variation of illumination, which may (in the example herein) range from 0.05 watts to 0.3 watts, as seen in Fig. 3.
  • 25source of light 10 may be one or more LEDs, either infrared or otherwise, or any other suitable light source.
  • the power steps should be chosen so as to provide, with the highest voltage, adequate illumination to record distinguishable features of a
  • the invention may include the ability to shift the voltages by altering the voltage divider.
  • the resistor 27 may be shorted out by a FET 48 when it receives a signal on a line 49, power conditioned by an amplifier 50 in response to a photo cell 51 detecting a given brightness level in the surveillance field of view.
  • the photo cell 51 may be 5utilized to reduce the power provided to the infrared laser diode 10 during daylight; or it could be used to distinguish between the illumination outside of a gas station in a period when the gas station is in operation and the lights are on from the period after the gas lOstation is closed and most of the external lights are turned off.
  • There are numerous other ways to alter the illumination such as by having several ranges of alteration provided as a function of background lighting. If not useful, the variation in lighting provided by the
  • 15apparatus 48-51 need not be utilized. Or, an increase in the power level may be achieved by shorting out resistor at the upper end of the voltage divider, in a similar fashion.
  • the invention may of course be utilized with a
  • a diode or other light source may be mounted directly in front of a lens or other port which
  • the invention by utilizing infrared, provides adequate illumination without attracting attention to the source of the illumination, and without alarming or sun- blinding customers in the surveillance field of view.
  • the invention provides illumination where needed, to support video or photographic recording of the surveillance field of view.
  • the invention may preferably be used with a real ⁇ time movie camera (video or photographic), but may also be used with a camera which records images in time- interspersed frames (e.g., two frames per second); the 5term "surveillance camera” includes any such camera.
  • the invention may utilize an infrared filter 55 in front of the camera lens 14 to filter out visible illumination from background sources, and preferentially pass infrared illumination, thereby lOenhancing the desired image of an object in the field of view of a surveillance camera.

Abstract

Infrared radiation from a light source (10) such as a laser diode illuminates the field of view of a surveillance camera (14). The amount of illumination is varied in intervals (fig. 3), which may, for example, be about 3/4 of a second, by varying the power applied to the light source. The radiation may emanate from optical fibers (12) surrounding a camera lens (14), or through other ports. The power to the laser diode (10) may be altered in response to background light sensed by a photo cell (51).

Description

VARIED INTENSITY AND/OR INFRARED AUXILIARY ILLUMINATION OF SURVEILLANCE AREA
Technical Field This invention relates to enhancing the illumination of surveillance fields of view for video and/or photographic recording of activity, such as in the vicinity of automatic teller machines (ATMs) and other areas.
Background Art Recording of surveillance scenes is commonly used to deter criminal activity and to assist in apprehending the person responsible for the crime. Inside of banks and stores, video cameras have been guite successful in assisting the apprehension, and therefore useful as deterrents. On the other hand, recorded surveillance in the vicinity of automatic teller machines has been less successful. The scene monitored by a video camera at an ATM is typically poorly lit for video/photographic purposes. The field of interest is typically back lit and/or underexposed in that the sun or remote lights adequately illuminate the background scene, but not the face of an ATM user or an attacker near the ATM. In bright sunlight, for instance, the camera automatic gain control (AGC) may reduce sensitivity below that which provides an adequate definition of a face near the ATM. Even with additional illumination, it frequently happens that the video or photographic record will be overexposed, or underexposed, despite the use of AGC and reasonable illumination. The problem could be solved by bright spotlights shining on the area where the ATM user (or other subject) would normally be while operating the machine, but this will make customers extremely uncomfortable, and sun- blind the user to the extent of making it difficult to read the prompts and indicia while using the machine, and difficult to see an oncoming attacker or other threat.
Disclosure of Invention Objects of the invention include provision of adequate illumination of the field of view of a surveillance recorder, and assurance of proper balance of illumination and sensitivity to yield a recognizable pattern of the recorded image of someone in the field of view of a surveillance recorder. As used herein, the field of surveillance recording including video records (both digital and analog) and photographic records will be referred to, for convenience only, as video records. Thus, although the invention is described and claimed in terms of video cameras, recordings and playback, such terms will include photographic equivalents thereof.
According to the present invention, the field of view of a video camera utilized for security surveillance is illuminated with high intensity infrared radiation thereby to adequately illuminate objects and faces near the camera (such as a user or an attacker near an ATM), adequately to record the characteristics thereof despite the amount or variation in background illumination (such as from the sun and remote lighting) . In accordance with the invention, the intensity of illumination of a surveillance field of view is constantly varied with respect to time so that for any one subject, video records will be made at various levels of illumination, thereby enhancing the capability to distinguish features of the subject.
In further accord with the invention, the illumination is varied as between bright and dark backgrounds, thereby assuring an adequate general level of illumination (in sunlight) without excessive illumination (at night). The invention provides a much greater assurance of being able to recognize individuals in the field of a view of a video camera, both in daylight and at night, without unduly impairing the ability of subjects of the 5video record to see sufficiently to use an ATM machine and avoid threats in the area. The invention is extremely simple and capable of being implemented in a variety of configurations to suit indoor and outdoor surveillance areas, in confined and open spaces, in lOexisting as well as new installations.
Other objects, features and advantages of the present invention will become more apparent in the light of the following detailed description of exemplary embodiments thereof, as illustrated in the accompanying lδdrawing.
Brief Description of the Drawings Fig. 1 is a simplified schematic block diagram of an exemplary embodiment of the invention.
Fig. 2 is a front elevation view of a camera lens 20employing the invention, taken on the line 2-2 of Fig. 1. Fig. 3 is a simplified illustration of the timing of the embodiment of Fig. 1.
Fig. 4 is a stylized illustration of the invention viewing a surveillance object at an ATM.
25 Best Mode for Carrying Out the Invention
Referring to Fig. 1, a light source 10, which may be a laser diode or one or more LEDs, illuminates a plurality of optical fibers 11 which may be split so as to feed additional optical fibers 12, to conduct the
301ight from the source 10 and radiate it toward a surveillance field of view (to the right of Fig. 1), as seen in Fig. 4. The source 10 may be an infrared laser, such as an Opto Power Corp. OPC-A001. As seen in Fig. 2, the optical fibers 12 may terminate in an annulus 13
35surrounding a lens 14 of a video camera. In such a case, the fibers may be selected from those readily available which have suitably shaped tips to provide about a 30° dispersion of radiation emanating from the tips thereof. In accordance with the invention, the infrared 5laser diode 10 may be operated in a manner to provide varying intensity of illumination by providing different operating voltages to it through selectively operated switches, such as a plurality of field effect transistor switches (FETs) 15-18, each applying a corresponding lOvoltage from a tap 21-24 of a voltage divider which includes a plurality of resistors 27-32 between a suitable DC source 33 and ground.
An oscillator 36 drives a counter 37, the output of which on a plurality of lines 38 is decoded by a decode
15circuit 39 so as to provide signals on related lines 42- 45 that, by successive operation of corresponding FETs 15-18 will provide steps of increasing voltage, which may be of 750 millisecond duration as illustrated in Fig. 3, or which may be adjusted to provide successive periods of
20varying illumination of any suitable length. The voltage steps may be selected with respect to the particular source 10 used so as to provide correct variation of illumination, which may (in the example herein) range from 0.05 watts to 0.3 watts, as seen in Fig. 3. The
25source of light 10 may be one or more LEDs, either infrared or otherwise, or any other suitable light source. In any case, the power steps should be chosen so as to provide, with the highest voltage, adequate illumination to record distinguishable features of a
30person in under the most dimly lit conditions of a particular surveillance field of view, and to provide, with the lowest voltage, an illumination sufficiently low so as to not to overexpose the same surveillance area at a time when it may be brightly lit.
35 If it is found to be useful, the invention may include the ability to shift the voltages by altering the voltage divider. For instance, the resistor 27 may be shorted out by a FET 48 when it receives a signal on a line 49, power conditioned by an amplifier 50 in response to a photo cell 51 detecting a given brightness level in the surveillance field of view. The photo cell 51 may be 5utilized to reduce the power provided to the infrared laser diode 10 during daylight; or it could be used to distinguish between the illumination outside of a gas station in a period when the gas station is in operation and the lights are on from the period after the gas lOstation is closed and most of the external lights are turned off. There are numerous other ways to alter the illumination, such as by having several ranges of alteration provided as a function of background lighting. If not useful, the variation in lighting provided by the
15apparatus 48-51 need not be utilized. Or, an increase in the power level may be achieved by shorting out resistor at the upper end of the voltage divider, in a similar fashion.
The invention may of course be utilized with a
20greater or lesser number of steps than in the example given herein; it may utilize continuously ramping power, by substituting a cyclic voltage ramp for the apparatus of Fig. 1; or it may utilize pulses of increasing steps synchronized with the camera vertical frame rate; and it
25may be altered in other respects, utilizing apparatus and techniques known to the art.
Instead of conducting radiation along the optical fibers 11, 12, a diode or other light source may be mounted directly in front of a lens or other port which
30overlooks the surveillance field of view.
The invention, by utilizing infrared, provides adequate illumination without attracting attention to the source of the illumination, and without alarming or sun- blinding customers in the surveillance field of view.
35The invention provides illumination where needed, to support video or photographic recording of the surveillance field of view. The invention may preferably be used with a real¬ time movie camera (video or photographic), but may also be used with a camera which records images in time- interspersed frames (e.g., two frames per second); the 5term "surveillance camera" includes any such camera.
As shown in Fig. 4, the invention may utilize an infrared filter 55 in front of the camera lens 14 to filter out visible illumination from background sources, and preferentially pass infrared illumination, thereby lOenhancing the desired image of an object in the field of view of a surveillance camera.
Thus, although the invention has been shown and described with respect to exemplary embodiments thereof, it should be understood by those skilled in the art that 15the foregoing and various other changes, omissions and additions may be made therein and thereto, without departing from the spirit and scope of the invention.

Claims

WHAT IS CLAIMED IS:
1. Apparatus for illuminating the field of view of a surveillance camera, comprising: an infrared light source; optics for coupling radiation emanating from said infrared light source to the field of view of a surveillance camera; and a source of power connected to said infrared light source for applying power, at varying power levels which vary with respect to time, to said infrared light source.
2. Apparatus according to claim 1 wherein said source of power comprises a plurality of switches, said switches being operated cyclically, one at a time, in a timed sequence to provide power at corresponding different power levels to said infrared light source.
3. Apparatus according to claim 1 wherein said source of power includes photo responsive means to adjust the amount of power provided to said infrared light source in response to the level of background illumination in the field of view of said surveillance camera.
4. Apparatus according to claim 1 wherein said infrared light source comprises a laser diode.
5. Apparatus according to claim 1 wherein said infrared light source comprises a light emitting diode.
6. Apparatus for illuminating the field of view of a surveillance camera, comprising: a variable intensity source of radiation; optics for coupling radiation emanating from said source to illuminate the field of view of a surveillance camera; and means for varying the intensity of radiation provided by said source.
7. Apparatus according to claim 6 wherein said source of radiation comprises a source of infrared radiation.
8. Apparatus according to claim 6 wherein said source of radiation comprises a laser diode.
9. Apparatus according to claim 6 wherein said source of radiation comprises a light emitting diode.
10. A method of recording successive frames of images in a surveillance field of view by means of a surveillance camera which method includes illuminating said field of view with a source of illumination, and varying the intensity of said illumination as a function of time at a rate with respect to the timing of said successive frames of recorded images to assure each subject being recorded in said successive frames at varying levels of exposure.
11. A method according to claim 10 comprising illuminating said field of view with a source of infrared illumination.
12. A method according to claim 10 comprising illuminating said field of view with a source which comprises a laser diode.
13. A method according to claim 10 comprising illuminating said field of view with a source which comprises a light emitting diode.
PCT/US1996/003333 1995-03-20 1996-03-12 Varied intensity and/or infrared auxiliary illumination of surveillance area WO1996029827A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU53082/96A AU5308296A (en) 1995-03-20 1996-03-12 Varied intensity and/or infrared auxiliary illumination of surveillance area

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/406,423 US5739847A (en) 1995-03-20 1995-03-20 Varied intensity and/or infrared auxiliary illumination of surveillance area
US08/406,423 1995-03-20

Publications (1)

Publication Number Publication Date
WO1996029827A1 true WO1996029827A1 (en) 1996-09-26

Family

ID=23607923

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/003333 WO1996029827A1 (en) 1995-03-20 1996-03-12 Varied intensity and/or infrared auxiliary illumination of surveillance area

Country Status (3)

Country Link
US (2) US5739847A (en)
AU (1) AU5308296A (en)
WO (1) WO1996029827A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2361994A (en) * 2000-05-06 2001-11-07 Astron Clinica Ltd Analysing skin histology
WO2005012786A3 (en) * 2003-07-29 2005-08-18 Extreme Cctv Inc A fibre optic laser illuminator for surveillance camera speed domes
GB2444951A (en) * 2006-12-14 2008-06-25 Camdeor Technology Co Ltd Surveillance camera with solar detector

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5739847A (en) * 1995-03-20 1998-04-14 Northrop Grumman Corporation Varied intensity and/or infrared auxiliary illumination of surveillance area
CA2194027C (en) * 1996-12-24 2001-12-04 Richard Morgan Helms Imaging system using a data transmitting light source for subject illumination
US6104031A (en) * 1997-02-24 2000-08-15 Quantum Group, Inc. Surveillance systems
US6470233B1 (en) * 1997-09-26 2002-10-22 Gilbarco Inc. Fuel dispensing and retail system for preventing use of stolen transponders
US7883005B2 (en) * 1998-11-25 2011-02-08 Diebold, Incorporated Banking system controlled by data bearing records
US20040016796A1 (en) * 1998-11-25 2004-01-29 Diebold, Incorporated Automated banking apparatus and method
US6761308B1 (en) * 1998-11-25 2004-07-13 Diebold, Incorporated Automated merchant banking apparatus and method
AU5315700A (en) * 1999-06-02 2000-12-18 Cyclovision Technologies, Inc. Omni-directional security and lighting system
US20020171754A1 (en) * 2001-05-18 2002-11-21 I-Jen Lai Digital camera with multi-illuminating source
US6445293B1 (en) * 2001-07-17 2002-09-03 Smartmatics, Inc. Versatile camera system for secure document transactions
US6824317B2 (en) * 2001-11-21 2004-11-30 Thales Avionics, Inc. Universal security camera
ATE319263T1 (en) * 2002-03-11 2006-03-15 Inventio Ag VIDEO MONITORING SYSTEM USING 3-D SEMICONDUCTOR IMAGE SENSOR AND INFRA-RED LIGHT SOURCE
AU2003262960A1 (en) * 2002-09-20 2004-04-08 Bae Systems Information And Electronic Systems Integration Inc Front lens shutter mount for uniformity correction
US7174077B1 (en) * 2003-07-30 2007-02-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Fiber coupled laser diodes with even illumination pattern
US7236200B2 (en) * 2003-07-30 2007-06-26 Extreme Cctv International Inc. Slip ring laser illuminator for speed domes
FR2861526B1 (en) * 2003-10-27 2006-01-06 Hymatom LIGHTING DEVICE ASSOCIATED WITH A ROTATIONAL MOBILE VIDEO SURVEILLANCE CAMERA
US20070236343A1 (en) * 2004-09-23 2007-10-11 Becksted Albert M Surveillance network for unattended ground sensors
US20100039515A1 (en) * 2005-05-13 2010-02-18 Dietz Dan L Method and Apparatus for Alignment of a Trailer Hitch
US8838210B2 (en) * 2006-06-29 2014-09-16 AccuView, Inc. Scanned laser vein contrast enhancer using a single laser
JP5040776B2 (en) * 2008-03-31 2012-10-03 アイシン精機株式会社 Imaging device
US7991281B1 (en) * 2010-03-19 2011-08-02 Hewlett-Packard Development Company, L.P. Illumination source having programmable rise and fall times
CN102338973A (en) * 2010-07-16 2012-02-01 财团法人交大思源基金会 Illumination control module and camera provided with same
CN102375973B (en) * 2010-08-24 2013-04-03 汉王科技股份有限公司 Face recognition method and system, and infrared back light compensation method and system
US8908024B2 (en) * 2011-06-29 2014-12-09 Honeywell International Inc. System for detecting an item within a specified zone

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027334A (en) * 1975-10-10 1977-05-31 The United States Of America As Represented By The Secretary Of The Army Standby illuminator for remote controlled viewer
US4300167A (en) * 1980-02-07 1981-11-10 Circon Corporation Automatic iris control system
US4782386A (en) * 1986-03-08 1988-11-01 Richard Wolf Gmbh Video endoscope with a light source operable in a continuous or stroboscopic mode
US4843461A (en) * 1985-06-25 1989-06-27 Matsushita Electric Works, Ltd. Over-door interphone system provided with a night-vision monitoring device
US4881128A (en) * 1988-05-11 1989-11-14 Asahi Research Corporation Video camera and recorder system with illumination control features

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748383A (en) * 1971-04-05 1973-07-24 R Grossman Camera system for day and night use
US3816654A (en) * 1972-05-02 1974-06-11 Stromberg Carlson Corp Solid state camera tube embodying a fixed iris
US4052716A (en) * 1976-03-29 1977-10-04 Mortensen Tage A Fire and intruder detection and alarm apparatus
US4707595A (en) * 1985-01-30 1987-11-17 Meyers Brad E Invisible light beam projector and night vision system
KR890001908B1 (en) * 1985-09-19 1989-05-31 가부시끼가이샤 도시바 Endoscope apparatus with solid state image pickup device
US4805037A (en) * 1987-10-15 1989-02-14 Eastman Kodak Company Image recording system
US4866285A (en) * 1988-06-20 1989-09-12 Murasa International Infrared flash unit
US5130737A (en) * 1989-06-27 1992-07-14 Minolta Camera Kabushiki Kaisha Flash bracket photographing apparatus for a camera
US4991183A (en) * 1990-03-02 1991-02-05 Meyers Brad E Target illuminators and systems employing same
US5061997A (en) * 1990-06-21 1991-10-29 Rensselaer Polytechnic Institute Control of visible conditions in a spatial environment
US5550641A (en) * 1991-05-15 1996-08-27 Gentech Corporation System and method for rendering images
NL9200283A (en) * 1992-02-17 1993-09-16 Aritech Bv MONITORING SYSTEM.
US5577148A (en) * 1995-02-07 1996-11-19 Kamatani; Yasuo Laser scanning apparatus with interactive optical signal transmitting unit
US5739847A (en) * 1995-03-20 1998-04-14 Northrop Grumman Corporation Varied intensity and/or infrared auxiliary illumination of surveillance area

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027334A (en) * 1975-10-10 1977-05-31 The United States Of America As Represented By The Secretary Of The Army Standby illuminator for remote controlled viewer
US4300167A (en) * 1980-02-07 1981-11-10 Circon Corporation Automatic iris control system
US4843461A (en) * 1985-06-25 1989-06-27 Matsushita Electric Works, Ltd. Over-door interphone system provided with a night-vision monitoring device
US4782386A (en) * 1986-03-08 1988-11-01 Richard Wolf Gmbh Video endoscope with a light source operable in a continuous or stroboscopic mode
US4881128A (en) * 1988-05-11 1989-11-14 Asahi Research Corporation Video camera and recorder system with illumination control features

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2361994A (en) * 2000-05-06 2001-11-07 Astron Clinica Ltd Analysing skin histology
GB2361994B (en) * 2000-05-06 2004-12-08 Astron Clinica Ltd Apparatus and methods for analysing skin histology
WO2005012786A3 (en) * 2003-07-29 2005-08-18 Extreme Cctv Inc A fibre optic laser illuminator for surveillance camera speed domes
GB2444951A (en) * 2006-12-14 2008-06-25 Camdeor Technology Co Ltd Surveillance camera with solar detector

Also Published As

Publication number Publication date
US5739847A (en) 1998-04-14
AU5308296A (en) 1996-10-08
US5973730A (en) 1999-10-26

Similar Documents

Publication Publication Date Title
US5739847A (en) Varied intensity and/or infrared auxiliary illumination of surveillance area
US7136513B2 (en) Security identification system
KR100948572B1 (en) Method and apparatus for inhibiting projection of selected areas of a projected image
US20070133844A1 (en) Security identification system
AU2002306508A1 (en) Method and apparatus for inhibiting projection of selected areas of a projected image
JPH05137064A (en) Television camera device
NL1029960C1 (en) Burglar alarm, plays pre=recorded warning message to potential burglar entering monitoring zone
KR100878491B1 (en) Camera monitor system and method for controling the same
WO1996029826A1 (en) Filtered auxiliary illumination of surveillance area
JPH0727030B2 (en) Movement detection device
WO1995006388A1 (en) Life extender and bright light protection for cctv camera system with image intensifier
JP4440351B2 (en) Color video camera, TV door phone and monitoring device
JP3919499B2 (en) Mask detection device and surveillance camera device
BE1016483A6 (en) DETECTION CAMERA.
JPH07244718A (en) Security unit
JP3651860B2 (en) Imaging display device
US7319219B2 (en) System for handling light for intensification by an image intensifier
JP3859670B2 (en) Imaging display device
US20220182529A1 (en) Remotely triggered infrared spotlight system and method of use
RU2345390C2 (en) Method of optoelectronic objects detection and device for its realisation
JPS63198484A (en) Auto iris television camera
JPH0578234B2 (en)
JP2549858Y2 (en) Condensation detector for camera case
KR0183763B1 (en) Back light correction method and monitoring camera using it
JPH0271397A (en) Picture monitoring device

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AU AZ BB BG BR BY CA CN CZ EE FI GE HU JP KG KR KZ LT LV MD MX NO NZ PL RO RU SG SI SK TJ TM TR UA UZ VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA