WO2011024193A2 - Electronically variable field of view (fov) infrared illuminator - Google Patents

Electronically variable field of view (fov) infrared illuminator Download PDF

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Publication number
WO2011024193A2
WO2011024193A2 PCT/IN2010/000497 IN2010000497W WO2011024193A2 WO 2011024193 A2 WO2011024193 A2 WO 2011024193A2 IN 2010000497 W IN2010000497 W IN 2010000497W WO 2011024193 A2 WO2011024193 A2 WO 2011024193A2
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WO
WIPO (PCT)
Prior art keywords
illuminator
camera
illumination
fov
microcontroller
Prior art date
Application number
PCT/IN2010/000497
Other languages
French (fr)
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WO2011024193A3 (en
Inventor
Natarajan Kannan
Original Assignee
Natarajan Kannan
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 Natarajan Kannan filed Critical Natarajan Kannan
Publication of WO2011024193A2 publication Critical patent/WO2011024193A2/en
Publication of WO2011024193A3 publication Critical patent/WO2011024193A3/en

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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
    • G08B13/19634—Electrical details of the system, e.g. component blocks for carrying out specific functions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/20—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means

Definitions

  • the present invention relates to an Infrared illuminator which is used with closed circuit TV cameras, fixed cameras with variable zoom and Pan- Tilt-Zoom (PTZ) cameras. Especially the present invention relates to an electronically variable field of view (FOV) Infrared illuminator.
  • FOV electronically variable field of view
  • IR illuminators presently available for CCTV applications have fixed manually adjustable or mechanically adjustable FOV and illumination depth control. These adjustable means have to be done at the time of installation or motorized adjustable means have to be equipped when the zoom level is changed. For example, incase of a fixed camera with variable zoom or PTZ camera, the IR illumination FOV (i.e. angle and depth of illumination) has to be varied to get a clear image. The intensity of illumination also has to be adjusted to avoid over- bright images.
  • US 2007/0242939 recites an adaptive illumination lightning system which describes a system with two LED lighting sources mechanically linked by hinge and to vary the angular movement between them to adjust illumination.
  • US 6158879 discloses an infrared reflector and illumination system which describes a system with infrared light source and specific reflector design to get uniform illumination.
  • US 4843283 discloses an infrared ray detector control illumination system which describes a system and an electronic circuit for illumination control with plurality of infrared detection systems located in plurality of adjacent scanning areas.
  • US 5739847 discloses a varied intensity and/or infrared auxiliary illumination of surveillance area which describes a system of varying illumination by varying power to a laser diode.
  • US 4948210 discloses an infrared illuminator which describes a system with laser source and cylindrical housing.
  • US 2005/0075628 discloses a variable intensity wide angle illuminator which describes a system of varying illumination which is optical cable based.
  • US patent document 4948210 discloses an Infrared zoom illuminator which describes a system with laser light source in cylindrical housing.
  • US 4914461 discloses a camera having illumination angle strobe device which describes a system with group of power lenses.
  • US 5486886 discloses a variable angle flash with linear drive which describes a system with motorized drive.
  • the principal object of the present invention is to invent an IR illuminator which is capable of electronically varying IR illumination depending upon the zoom level of camera.
  • Another main object of the present invention is to invent an IR illuminator wherein the FOV adjustment can be done automatically or manually from a remote control keyboard.
  • Yet another object of the present invention is to provide a single IR illuminator for most of the surveillance or security applications in sites of fixed/ PTZ CCTV cameras.
  • Still another main object of the invention is to obtain clear video images from fixed or PTZ CCTV cameras at night or in low light condition by using IR illuminator in accordance with the present invention, wherein clear images are obtained by purely electronic means without any moving parts.
  • the present invention relates to an electronically variable field of view (FOV) Infrared illuminator for PTZ camera's and CCTV camera's which is used in the field of surveillance systems.
  • FOV field of view
  • the proposed invention is put forward to eliminate many disadvantages in the prior art such as
  • the " IR illuminator in accordance with the present invention allows manual, automatic or dynamic adjustment of FOV light intensity by purely electronic means. Manual controls from a keyboard by a user or automatic adjustment based on the zoom of the camera are possible in the IR illuminator in accordance with the present invention.
  • the light intensity output can also be varied by user manually or automatically by the system by analyzing the video signal.
  • This IR illuminator can be fixed to a PTZ camera by including the aspect of illumination and in that case it can be called as PTZi camera.
  • the IR illuminator in accordance with the present invention can be used with PTZ cameras. Incase of PTZ cameras, the illuminator has to be fixed on the Pan/Tilt unit. In general, the IR illuminator has a variable illuminating angle and depth of illumination usually specified in meters. In the present invention Infrared source with this feature is achieved by purely electronic means and without any mechanical movement.
  • the illuminating light output can also be varied manually or automatically.
  • the IR illuminator is associated with the electronic circuits to carry out these functions such as variation of illuminating light output etc.
  • the control unit of the IR illuminator can be integrated in the housing of said illuminator or can be kept externally.
  • Fig: 1 shows a schematic representation of IR illuminator in accordance with the present invention attached with zoom or PTZ camera.
  • Fig: 1 shows the IR illuminator which contains multiple groups of IR- LED's, the different LED groups having different illumination angles ranging from a few degree to almost 180 degree.
  • the light output of each LED group is adjusted to get different FOV or depth and angle of illumination. These adjustments are carried out by suitably controlling the current through the LED group.
  • the LED group with wide beam angle for instance 120 degree
  • the narrow angle LED group say 10 degree beam angle
  • the current through different LED groups will be adjusted to get required illumination depths.
  • Each illuminator has electronic circuits for precise control.
  • the system also has a micro controller to receive commands from a remote control keyboard and to adjust the illumination.
  • the same micro controller can adjust FOV automatically depending on zoom level of the camera.
  • the same controller can analyze the video signal from the camera and adjust the illumination to get clear images.
  • the microcontroller and associated circuitry receive the video signal and serial zoom commands to perform the above function.
  • the IR illuminator is provided with a suitable cooling mechanism.
  • the illumination depth and angle or FOV can be adjusted manually using a remote keyboard as required.
  • the keyboard can be connected to the illuminator by suitable data linking schemes like RS 232/ RS 422/ 485 etc.
  • FOV or illumination is adjusted along with the presets for the PTZ camera.
  • this camera may be called as PTZi camera wherein i stands for illumination. So when camera moves from one position to another (presets), light output/ FOV also varies as per preset values.
  • the FOV will vary according to zoom ratios of the camera.
  • the control circuit After dynamically selecting FOV, the control circuit will adjust illumination, to get clear image by analyzing the video signal from the camera.
  • a suitable mechanism is provided to switch between day and night mode of operation.
  • the zoom commands and light control commands from the keyboard can be received by the control electronics.
  • the video signals are analyzed by control electronics for illumination control.
  • IR illuminator comprises of multiple groups of LED's and each LED group consists of a string of LED's connected in series. The number of LED's in a string depends on the intensity required and it can be varying up to 50 or more.
  • Each LED string is connected to a current driver in the control electronics.
  • Each group has its own current driver.
  • the current driver current can be controlled by a voltage, which can in turn be adjusted from a Digital to Analog converter, by the microcontroller.
  • the micro controller has serial port to receive data from the keyboard.
  • Another Analog circuit develops a voltage proportional to instantaneous brightness of the image and the microcontroller measures same through an Analog to Digital converter. Rest of processing is carried by the software inbuilt in the system.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)
  • Stroboscope Apparatuses (AREA)

Abstract

The present invention relates to an infrared (IR) illuminator which is used with closed circuit TV cameras, fixed cameras with variable zoom and Pan-Tilt-Zoom (PTZ) cameras. Especially the present invention relates to an electronically variable field of view (FOV) infrared illuminator. The IR illuminator in accordance with the present invention allows manual, automatic or dynamic adjustment of FOV light intensity by purely electronic means. Manual controls from a keyboard by a user or automatic adjustment based on the zoom of the camera are possible in the IR illuminator in accordance with the present invention. The light intensity output can also be varied by user manually or automatically by the system by analyzing the video signal.

Description

ELECTRONICALLY VARIABLE FIELD OF VIEW (FOV) INFRARED ILLUMINATOR
Field of the Invention
The present invention relates to an Infrared illuminator which is used with closed circuit TV cameras, fixed cameras with variable zoom and Pan- Tilt-Zoom (PTZ) cameras. Especially the present invention relates to an electronically variable field of view (FOV) Infrared illuminator.
Background of the Invention
IR illuminators presently available for CCTV applications have fixed manually adjustable or mechanically adjustable FOV and illumination depth control. These adjustable means have to be done at the time of installation or motorized adjustable means have to be equipped when the zoom level is changed. For example, incase of a fixed camera with variable zoom or PTZ camera, the IR illumination FOV (i.e. angle and depth of illumination) has to be varied to get a clear image. The intensity of illumination also has to be adjusted to avoid over- bright images.
Known prior art methods are disclosed in the following patent documents. For instance US 6,585,395 discloses a variable beam light emitting diode light source system which describes a system to vary beam angles mechanically/ manually by using a screw.
US 2007/0242939 recites an adaptive illumination lightning system which describes a system with two LED lighting sources mechanically linked by hinge and to vary the angular movement between them to adjust illumination.
US 6158879 discloses an infrared reflector and illumination system which describes a system with infrared light source and specific reflector design to get uniform illumination.
US 4843283 discloses an infrared ray detector control illumination system which describes a system and an electronic circuit for illumination control with plurality of infrared detection systems located in plurality of adjacent scanning areas.
US 5739847 discloses a varied intensity and/or infrared auxiliary illumination of surveillance area which describes a system of varying illumination by varying power to a laser diode. US 4948210 discloses an infrared illuminator which describes a system with laser source and cylindrical housing.
US 2005/0075628 discloses a variable intensity wide angle illuminator which describes a system of varying illumination which is optical cable based.
US patent document 4948210 discloses an Infrared zoom illuminator which describes a system with laser light source in cylindrical housing.
US 4914461 discloses a camera having illumination angle strobe device which describes a system with group of power lenses.
US 5486886 discloses a variable angle flash with linear drive which describes a system with motorized drive.
None of the prior patent documents proposed a scheme which dynamically and electronically varies FOV of IR illumination depending on the zoom level of camera. More specifically none of the prior art patent documents disclose the FOV adjustment which can be done automatically or manually from a remote control keyboard.
Further in the known art, multiple models of IR illuminators have to be used depending on the application site of camera installed, with the adjustment being carried out by manual or mechanical or motorized means. Indeed there exists a need for a system which uses just one model of IR illuminator for most of surveillance and security applications in sites of fixed/ PTZ CCTV cameras.
Object of the Invention The principal object of the present invention is to invent an IR illuminator which is capable of electronically varying IR illumination depending upon the zoom level of camera. Another main object of the present invention is to invent an IR illuminator wherein the FOV adjustment can be done automatically or manually from a remote control keyboard.
Yet another object of the present invention is to provide a single IR illuminator for most of the surveillance or security applications in sites of fixed/ PTZ CCTV cameras.
Still another main object of the invention is to obtain clear video images from fixed or PTZ CCTV cameras at night or in low light condition by using IR illuminator in accordance with the present invention, wherein clear images are obtained by purely electronic means without any moving parts.
Summary of the Invention
The present invention relates to an electronically variable field of view (FOV) Infrared illuminator for PTZ camera's and CCTV camera's which is used in the field of surveillance systems. The proposed invention is put forward to eliminate many disadvantages in the prior art such as
1) Manually and mechanically adjustable FOV and light output
2) Moving parts for FOV adjustment.
3) Need to have multiple models of illuminators with different FOV/ depth of illumination etc.
The" IR illuminator in accordance with the present invention allows manual, automatic or dynamic adjustment of FOV light intensity by purely electronic means. Manual controls from a keyboard by a user or automatic adjustment based on the zoom of the camera are possible in the IR illuminator in accordance with the present invention. The light intensity output can also be varied by user manually or automatically by the system by analyzing the video signal. This IR illuminator can be fixed to a PTZ camera by including the aspect of illumination and in that case it can be called as PTZi camera.
The IR illuminator in accordance with the present invention can be used with PTZ cameras. Incase of PTZ cameras, the illuminator has to be fixed on the Pan/Tilt unit. In general, the IR illuminator has a variable illuminating angle and depth of illumination usually specified in meters. In the present invention Infrared source with this feature is achieved by purely electronic means and without any mechanical movement.
In the present invention the illuminating light output can also be varied manually or automatically. The IR illuminator is associated with the electronic circuits to carry out these functions such as variation of illuminating light output etc. The control unit of the IR illuminator can be integrated in the housing of said illuminator or can be kept externally.
Brief description of the drawing
Fig: 1 shows a schematic representation of IR illuminator in accordance with the present invention attached with zoom or PTZ camera.
Detailed description of the Invention
Fig: 1 shows the IR illuminator which contains multiple groups of IR- LED's, the different LED groups having different illumination angles ranging from a few degree to almost 180 degree. Depending on the requirement, the light output of each LED group is adjusted to get different FOV or depth and angle of illumination. These adjustments are carried out by suitably controlling the current through the LED group.
When the zoom lens is in wide angle mode, the LED group with wide beam angle (for instance 120 degree) will be driven to have higher intensity compared to others. Similarly for Tele zoom, the narrow angle LED group (say 10 degree beam angle) will be driven to have a higher intensity and depending upon the zoom ratio, the current through different LED groups will be adjusted to get required illumination depths.
There can be plurality of illuminators associated with one video camera. Each illuminator has electronic circuits for precise control. The system also has a micro controller to receive commands from a remote control keyboard and to adjust the illumination. The same micro controller can adjust FOV automatically depending on zoom level of the camera. The same controller can analyze the video signal from the camera and adjust the illumination to get clear images. The microcontroller and associated circuitry receive the video signal and serial zoom commands to perform the above function. The IR illuminator is provided with a suitable cooling mechanism.
The illumination depth and angle or FOV can be adjusted manually using a remote keyboard as required. The keyboard can be connected to the illuminator by suitable data linking schemes like RS 232/ RS 422/ 485 etc. In the case of PTZ cameras, FOV or illumination is adjusted along with the presets for the PTZ camera. For this application, this camera may be called as PTZi camera wherein i stands for illumination. So when camera moves from one position to another (presets), light output/ FOV also varies as per preset values.
In automatic mode for both fixed/ PTZi application, the FOV will vary according to zoom ratios of the camera. After dynamically selecting FOV, the control circuit will adjust illumination, to get clear image by analyzing the video signal from the camera. A suitable mechanism is provided to switch between day and night mode of operation.
The zoom commands and light control commands from the keyboard can be received by the control electronics. The video signals are analyzed by control electronics for illumination control. IR illuminator comprises of multiple groups of LED's and each LED group consists of a string of LED's connected in series. The number of LED's in a string depends on the intensity required and it can be varying up to 50 or more. Each LED string is connected to a current driver in the control electronics. Each group has its own current driver. The current driver current can be controlled by a voltage, which can in turn be adjusted from a Digital to Analog converter, by the microcontroller. The micro controller has serial port to receive data from the keyboard. Another Analog circuit develops a voltage proportional to instantaneous brightness of the image and the microcontroller measures same through an Analog to Digital converter. Rest of processing is carried by the software inbuilt in the system. Advantages of the Invention
1. Manually and mechanically adjustable FOV and light output is replaced with automatic or dynamic adjustment of FOV and light intensity by purely electronic means.
2. Moving parts for FOV adjustment are eliminated.
3. In the present invention, there is no need to have multiple models of illuminators with different FOV, depth of illumination etc.

Claims

I claim:
1. An electronically variable field of view Infrared illuminator for camera comprising:
multiple groups of IR-LED's in different LED groups having different illumination angles in which illumination depth and angle of illumination (FOV) is varied by controlling the current through the said LED groups ;
an electronic circuit for current control;
a microcontroller to receive commands and to adjust the illumination;
wherein the said microcontroller adjusts FOV automatically depending on zoom level of said camera and said microcontroller analyzes the video signal from the said camera and adjusts the illumination to get clear image.
2. The illuminator as claimed in claim 1, wherein illumination is adjustable manually through a remote keyboard wherein the microcontroller receives commands from the said keyboard for adjusting the illumination.
3. The illuminator as claimed in claims 1 and 2, wherein said camera is PTZ camera.
4. The illuminator as claimed in claims 1 and 2, wherein said camera is fixed camera with variable zoom.
5. The illuminator as claimed in claims 1 and 2, wherein microcontroller controls FOV automatically, depending on the Zoom position of said camera.
6. The illuminator as claimed in claim 2, wherein keyboard is connected through RS232 or RS422 or RS485.
7. The illuminator as claimed in any of the preceding claims, wherein the microcontroller analyzes the video signal and optimizes the light intensity automatically to eliminate over blooming.
8. The illuminator as any one of the preceding claims, wherein the illuminator is mounted on pan and tilt mechanism for PTZ camera.
9. The illuminator as claimed in any one of the preceding claims, wherein each said LED group consists of a string of LED's connected in series.
10. The illuminator as claimed in claims 1 to 9, wherein each group of LED's are connected to a current driver in said electronic circuit, wherein current driver current is controlled by a voltage which in turn is adjusted through a Digital to Analog converter by the microcontroller.
11. A video camera comprising plurality of illuminators as claimed in any one of the preceding claims.
PCT/IN2010/000497 2009-08-20 2010-07-29 Electronically variable field of view (fov) infrared illuminator WO2011024193A2 (en)

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IN1981CH2009 2009-08-20

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