WO2013060392A1 - Méthode de régulation d'un ensemble de refroidissement - Google Patents

Méthode de régulation d'un ensemble de refroidissement Download PDF

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Publication number
WO2013060392A1
WO2013060392A1 PCT/EP2011/071192 EP2011071192W WO2013060392A1 WO 2013060392 A1 WO2013060392 A1 WO 2013060392A1 EP 2011071192 W EP2011071192 W EP 2011071192W WO 2013060392 A1 WO2013060392 A1 WO 2013060392A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
cooling
control
cooling device
camera
Prior art date
Application number
PCT/EP2011/071192
Other languages
English (en)
Inventor
Olav BOITEN
Fedde BOUWMAN
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP11788465.0A priority Critical patent/EP2772046B1/fr
Publication of WO2013060392A1 publication Critical patent/WO2013060392A1/fr

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
    • 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
    • H04N23/60—Control of cameras or camera modules

Definitions

  • the invention provides for a method of controlling a cooling device for an image sensor of a camera, especially a dome camera, a cooling arrangement for performing such a method and a camera.
  • a sufficient cooling of the imaging sensor has to be guaranteed.
  • a dome camera is a monitoring camera used in a protective system.
  • the dome camera is incorporated within a hemispherical shaded dome made of plastics. Said dome is provided for protecting the camera against damage and vandalism.
  • Dome cameras have been used at flashpoints as well as in public means of transport both interior and exterior.
  • a main advantage of such a dome camera is that it is not possible to determine the orientation of the camera hidden by the shaded dome.
  • Document EP 1 729 269 A1 discloses a dome with optical correction for use in a vandal proof surveillance camera system.
  • the dome comprises a transparent optical material, which itself comprises an inner surface and an outer surface. Both surfaces are essentially rotational symmetrical and exhibit non-spherical shapes. Said dome is used in a vandal proof surveillance camera system comprising said dome and a camera being pivotably mounted inside the dome.
  • cooling devices as cooling fans, for example.
  • Passive cooling systems e.g. by a conductive path, can be used alternatively or additionally.
  • a main subject in developing a cooling control system is to increase the lifetime of the cooling device for an imaging sensor in an outdoor dome camera.
  • This device enables to maintain good sensor/image performance at high temperatures. It is to be noted that imaging sensor performance is temperature dependent, usually, the lower the better. In case only sensor temperature is used to switch on and off the cooling device, the time period the cooling device is switched on would be too long and therefore, the life time of the cooling device would be limited.
  • the invention provides for method of controlling the operation of a cooling device according to claim 1 and an cooling arrangement according to claim 8 comprising such a cooling device.
  • Subject matter of the dependent claims and the description define embodiments of the invention.
  • the control is performed based on a model of an acceptable image performance and the temperature of the imaging sensor. Increasing temperature means increasing noise, especially fixed pattern noise. Furthermore, sensor specific artefacts can occur.
  • the smart temperature management control can switch the cooling device based on a model of the sensor performance and the actual video gain, integration time, and temperature. This way an optimal balance can be achieved between cooling device life time and image quality.
  • the cooling arrangement forming a smart temperature management system is an enabler to reduce unnecessary on time of the cooling device.
  • the control can be done based on a model of the acceptable image performance against sensor and imaging parameters, e.g. sensor analogue gain AG, digital gain DG, integration time IT, and the sensor temperature T.
  • a parameter representing the image performance level (IPL) can be calculated:
  • IPL f(T, AG, DG, IT)
  • MINJPL e.g. by perception studies and/or measurements.
  • the smart temperature management system will try to keep the image performance level above the minimum image performance level by controlling the cooling device operation.
  • This control can be both continuous and in discrete steps, e.g. on/off.
  • a cooling device is switched off/on based on sensor temperature T, analog gain AG, digital gain DG and time.
  • the conditions for switching on the cooling device are:
  • IPLO IPL off threshold
  • the hysteresis h that can be considered in performing the method described is applied to prevent that the fan will not quickly switch off after switching on to cool the sensor.
  • This hysteresis typically is higher than the temperature delta the fan causes.
  • Input parameters like gain and integration time are temporally filtered to reduce the influence on the control algorithm due to temporary glitches or noise.
  • the system time based hysteresis is applied. After the cooling device was switched off or on, the cooling device will not be switched for a certain period of time. This is done to limit the amount of fan switches for a better lifetime of the cooling device.
  • the colling device is switched off/on based on sensor temperature T and/or digital gain DG and/or sensor analog gain SAG and/or sensor digital gain SDG and/or sensor integration time SIT and/or the sensor temperature T.
  • image performance level (IPL) and MINJPL are defined as:
  • IPL f T, DG, SAG, SDG, SIT
  • IPL (a + 2 ⁇ ( (T- b) / c )) * DG * SAG * SDG * SIT * d
  • IPLO (a + 2 ⁇ ( (T- b - h) / c )) * DG * SAG * SDG * SIT * d
  • different sensor or video system parameters or in system measurements can be used to determine the image quality at a certain temperature.
  • the method described allows for smartly controlling a cooling device of an imaging sensor in a camera to reduce the on time. Therefore, actively cooling the image sensor without excessively stressing the cooling device is possible. It is to be noted that any suitable cooling device, e.g. a cooling fan or a peltier cooler, can be used.
  • any suitable cooling device e.g. a cooling fan or a peltier cooler, can be used.
  • FIG. 1 shows an exemplary embodiment of a cooling control arrangement according to the invention in an overview
  • FIG. 1 shows the functional principal of the cooling control arrangement
  • Figure 3 shows a second embodiment of a cooling control arrangement
  • FIG. 1 shows an exemplary embodiment of the cooling control arrangement 10 forming the smart temperature management control system comprising cooling device 42 within a camera 40 and a control device 50, wherein the control device 50 is located outside the camera 40.
  • the cooling control management arrangement 10 comprises the cooling device 42 and the control device 50, that can be implemented as an algorithm.
  • the drawing shows a temperature sensor 12, a video level control 14 and a light sensor 16 for light measurement.
  • the temperature sensor 12 transmits a signal 18 representing the determined temperature of the imaging sensor 28 to a temperature management 20.
  • the termperature sensor 12 is located nearby the im- aging sensor 28. In a preferred embodiment the determined termperature depends from a measured temperature and an offset value.
  • the video level control 14 transmits signals 22, 24, 26 representing the integration time (IT), the analogue gain (AG), and the digital gain (DG) to the temperature management 20, an imaging sensor 28, and a video processing 30.
  • the light sensor transmits a sig- nal 32 representing the measured light to the video level control 14.
  • the temperature management 20 as part of the control device 50 controls operation of the cooling device 42, e.g. a cooling fan, within the camera 40 by a control signal 44.
  • the cooling device 42 is adapted to cool the imaging sensor 28 within the camera, especially within a housing of the camera 40. In the drawing, the imaging sensor 28 is shown twice for clarity reasons as indicated by the broken line.
  • Figure 2 shows operation of the cooling control arrangement in more detail in a blockdiagram.
  • a model 60 the control according to the invention is based on is created with help of the gain 62 (analogue and/or digital), the integration time IT 64, and the temperature 66. With help of the model 60 a parameter 68 representing the image performance level I PL is calculated. Furthermore, IPLO can be calculated as it is part of the model 60.
  • a control 70 using the I PL and a signal 72 representing the time generates a control signal 74 for controlling operation of the cooling device.
  • the control can be based on the model (60) of the acceptable image perform- ance against at least one sensor and/or imaging parameter and the temperature
  • FIG 3 shows a second embodiment of the cooling control arrangement 10 forming the smart temperature management control system comprising cooling device 42 within a camera 40 and a control device 50 within the camera.
  • the cooling control management arrangement 10 comprises the cooling device 42 and the control device 50, that can be implemented as an algorithm.
  • the drawing shows a temperature sensor 12, a video level control 14 and a light sensor 16 for light measurement.
  • the temperature sensor 12 transmits a signal 18 representing the determined temperature of the imaging sensor 28 to a temperature management 20.
  • the termperature sensor 12 is located nearby the imaging sensor 28. In this second embodiment the determined termperature depends from a measured temperature and an offset value.
  • the video level control 14 transmits signals 22, 24, 26 representing the integration time (IT) and/or the analogue gain (AG) and/or the digital gain (DG) to the temperature management 20 and/or an imaging sensor 28 and/or a video processing 30.
  • the light sensor transmits a signal 32 representing the measured light to the video level control 14. Additionally or as an alternative the signal 32 representing the measured light to the video level control 14 is based on the levels provided by the imaging sensor 28.
  • the temperature management 20 as part of the control device 50 controls operation of the cooling device 42, e.g. a cooling fan, within the camera 40 by a control signal 44.
  • the cooling device 42 is adapted to cool the imaging sensor 28 within the camera, especially within a housing of the camera 40. In the drawing, the imaging sensor 28 is shown twice for clarity reasons as indicated by the broken line.
  • the operation of the temperature management 20 according to the second embodiment is shown in figure 2.

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

Abstract

L'invention concerne une méthode de régulation d'un dispositif de refroidissement (42) et un ensemble de refroidissement comprenant un tel dispositif de refroidissement (42). Selon la méthode, une régulation est effectuée en fonction d'un modèle d'une performance d'imagerie acceptable et de la température du capteur d'imagerie (28).
PCT/EP2011/071192 2011-10-27 2011-11-28 Méthode de régulation d'un ensemble de refroidissement WO2013060392A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11788465.0A EP2772046B1 (fr) 2011-10-27 2011-11-28 Méthode de régulation d'un ensemble de refroidissement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/EP2011/068866 WO2013060373A1 (fr) 2011-10-27 2011-10-27 Procédé de commande d'un agencement de refroidissement
EPPCT/EP2011/068866 2011-10-27

Publications (1)

Publication Number Publication Date
WO2013060392A1 true WO2013060392A1 (fr) 2013-05-02

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/EP2011/068866 WO2013060373A1 (fr) 2011-10-27 2011-10-27 Procédé de commande d'un agencement de refroidissement
PCT/EP2011/071192 WO2013060392A1 (fr) 2011-10-27 2011-11-28 Méthode de régulation d'un ensemble de refroidissement

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/068866 WO2013060373A1 (fr) 2011-10-27 2011-10-27 Procédé de commande d'un agencement de refroidissement

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112601000B (zh) * 2020-12-07 2022-03-25 南昌黑鲨科技有限公司 用于摄像头的减噪系统、方法及计算机可读存储介质

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1008973A1 (fr) * 1998-11-20 2000-06-14 Sony Corporation Caméra vidéo
US20050083419A1 (en) * 2003-10-21 2005-04-21 Konica Minolta Camera, Inc. Image sensing apparatus and image sensor for use in image sensing apparatus
US20050099515A1 (en) * 2002-08-22 2005-05-12 Olympus Optical Company, Ltd. Image pickup system
EP1729269A1 (fr) 2005-06-02 2006-12-06 Robert Bosch Gmbh Dôme avec une correction optique
US20070071343A1 (en) * 2005-09-29 2007-03-29 Jay Zipnick Video acquisition with integrated GPU processing
US7280141B1 (en) * 2003-09-23 2007-10-09 Pixim Inc Fixed pattern noise subtraction in a digital image sensor
JP2008011233A (ja) * 2006-06-29 2008-01-17 Fujifilm Corp 撮影装置
US20080158378A1 (en) * 2007-01-03 2008-07-03 Samsung Electronics Co., Ltd. Image sensor having temperature sensor and driving method thereof
US20100103295A1 (en) * 2008-10-23 2010-04-29 Kabushiki Kaisha Toshiba Imaging Device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1008973A1 (fr) * 1998-11-20 2000-06-14 Sony Corporation Caméra vidéo
US20050099515A1 (en) * 2002-08-22 2005-05-12 Olympus Optical Company, Ltd. Image pickup system
US7280141B1 (en) * 2003-09-23 2007-10-09 Pixim Inc Fixed pattern noise subtraction in a digital image sensor
US20050083419A1 (en) * 2003-10-21 2005-04-21 Konica Minolta Camera, Inc. Image sensing apparatus and image sensor for use in image sensing apparatus
EP1729269A1 (fr) 2005-06-02 2006-12-06 Robert Bosch Gmbh Dôme avec une correction optique
US20070071343A1 (en) * 2005-09-29 2007-03-29 Jay Zipnick Video acquisition with integrated GPU processing
JP2008011233A (ja) * 2006-06-29 2008-01-17 Fujifilm Corp 撮影装置
US20080158378A1 (en) * 2007-01-03 2008-07-03 Samsung Electronics Co., Ltd. Image sensor having temperature sensor and driving method thereof
US20100103295A1 (en) * 2008-10-23 2010-04-29 Kabushiki Kaisha Toshiba Imaging Device

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