WO2007069892A1 - Système d'appareils photo - Google Patents

Système d'appareils photo Download PDF

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Publication number
WO2007069892A1
WO2007069892A1 PCT/NL2006/000638 NL2006000638W WO2007069892A1 WO 2007069892 A1 WO2007069892 A1 WO 2007069892A1 NL 2006000638 W NL2006000638 W NL 2006000638W WO 2007069892 A1 WO2007069892 A1 WO 2007069892A1
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WO
WIPO (PCT)
Prior art keywords
camera
threshold level
level
output
operative state
Prior art date
Application number
PCT/NL2006/000638
Other languages
English (en)
Inventor
Johannes Petrus Marinus Cornelis Van Schijndel
Original Assignee
Internova Holding Bvba
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 Internova Holding Bvba filed Critical Internova Holding Bvba
Priority to EP06835661A priority Critical patent/EP1972133A1/fr
Publication of WO2007069892A1 publication Critical patent/WO2007069892A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
    • 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
    • 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

Definitions

  • the present invention relates in general to a camera system, suitable for guarding and/or monitoring objects. More particularly, the present invention relates to a camera system for placement ' outside, for guarding and/or monitoring buildings, particularly houses and business premises.
  • a camera system that produces image signals, particularly video images, of the guarded object, wherein the camera system is arranged outside this building.
  • the camera system may be directed to entrances of this building, such as doors or windows, but the camera may also be directed to a part of the terrain surrounding the building concerned, such as a garden.
  • the video images provided by the camera system may be stored locally, or may be transferred to a central storage location. It is also possible that the camera system is provided with image processing software for detecting movement, so that the camera can be used as a movement detector in a guarding system.
  • combi-cameras provide better images then a night view camera, but the quality is less then the quality of a day view camera. In dark conditions, combi-cameras provide better images then a day view camera, but the quality is less then the quality of a night view camera.
  • combi-cameras An important problem in the case of combi-cameras is that during the day use must be made of an IR-filter, but not during the night. To this end, a combi-camera has a displacement mechanism for the IR-filter, which mechanism is controlled by a light sensor. A problem with such mechanism is that it is susceptible to wear: preferably, a camera system should not have movable parts. Moveable parts are susceptible to wear and can fail .
  • the present invention aims to provide a camera system capable of providing image signals of very high quality, both during the night and during the day, without the necessity of moving parts.
  • a camera system comprises two digital cameras, the one camera being a day view camera and the other being a night view camera. Further, the camera system comprises at least one light sensor. When there is sufficient light (during the day) the day view camera is used. When it is dark (during the evening or the night) the night view camera is used. Thus, in all light conditions this system always has the good properties of day view cameras and night view cameras and the bad properties of day view cameras and night view cameras are eliminated.
  • the two cameras may be on continuously, and only one is used depending on the light conditions. Preferably, however, the camera which is not in use is switched off. Thereby, the useful life of the individual cameras is increased.
  • a camera When a camera is switched on from its OFF-state, it takes some time before it is operational. For a stable functioning it is of particular importance that the camera has a certain operational temperature . In order to avoid the delay caused by this, it is preferred that a camera is first switched STANDBY before it is switched on.
  • the system therefore distinguishes two different light intensity thresholds.
  • the day view camera is switched to STANDBY.
  • the night view camera is switched ON and the image signals of the day view camera are used.
  • the night view camera may be switched off.
  • the system again distinguishes two different light intensity thresholds.
  • the night view camera is switched to STANDBY.
  • the night view camera is switched ON and the image signals of the night view camera are used.
  • the day view camera can by switched off.
  • an IR-light source is switched on in the case of dark conditions.
  • Figure 2 schematically shows a block diagram of the. camera system
  • Figure 3 is a graphical representation illustrating the operation of a camera system according to the present invention
  • Figure 4 is a graphical representation illustrating the operation of an other embodiment of a camera system according to the present invention.
  • FIGS IA and IB show schematic perspective views of a camera system 1 according to the present invention.
  • the system 1 comprises a housing 100, with a front wall 101, a rear wall 102, side walls 103 and 104, a floor 105, and a shielding cap 106.
  • Figure IB shows the housing 100 with the shielding cap 106 removed, so that it can be seen that two digital video cameras are arranged in the interior of the housing 100, a first camera 10 and a second camera 20.
  • Each camera 10, 20 has a corresponding lens system 111, 121.
  • the front wall 101 is provided with two viewing openings 110, 120 arranged next to each other, for the respective cameras 10, 20.
  • the cameras 10, 20 are arranged within the housing 100 in such a way that their respective viewing lines are substantially mutually parallel, wherein the first camera 10 is arranged to "look" outside through the first viewing opening 110 while the second camera 20 is arranged to "look" outside through the second viewing opening 120.
  • a transparent plate is accommodated, for instance glass or plastic, on the one hand closing the viewing opening 110, 120 concerned and on the other hand being transparent to the relevant part of the light spectrum.
  • the figures IA and IB also show that two viewing openings 171, 172 are arranged in the front wall 101 for in this case two light sensors. In other embodiments, there may be more then two light sensors present, but it is also possible that there is only one light sensor present. Further, it is not necessary that a light sensor is arranged in the front wall 101, although this is preferred.
  • FIG. 2 schematically shows a block diagram of a preferred embodiment of the camera system 1.
  • the first camera 10 has three operative states, i.e. a first operative state (OFF) in which the camera is out of operation, a second operative state (ON) in which the camera is fully operational, and a third operative state (STANDBY) in which the camera is ready to become fully operational but consumes less energy then in the ON-state.
  • the first camera 10 is a controllable camera, and has a control input 10a for receiving a first control signal SCl.
  • the first camera 10 is arranged, in response to the control signal SCl, to operate in either its ON-state, or its OFF-state, or its STANDBY-state .
  • the first camera 10 has a signal output 10b for providing a video output signal SVl.
  • the camera system 1 further has a control device 2 , with a first control output 11 for providing the first control signal SCl.
  • the control device 2 may for instance be a suitably programmed microprocessor, and will in the following also be indicated by the phrase "controller".
  • the second camera 20 has three possible operative states OFF, ON and STANDBY, a control input 20a for receiving a control signal SC2, and an output terminal 20b for providing a video signal SV2, and the controller 2 has a second control output 12 for providing the second control signal SC2.
  • the camera system 1 has a system output 3 for outputting an image signal SV, provided by either the first camera 10 or the second camera 20.
  • the camera system 1 comprises a controllable switch 30, of which a first input 31 is coupled to the signal output 10b of the first camera 10, of which a second input 32 is coupled to the signal output 20b of the second camera 20, and of which an output 33 is coupled to the system output 3.
  • the switch 30 is of a type that is switchable between a first operative state in which its output 33 is connected to the first input 31, and a second operative state in which its output 33 is connected to its second input 32.
  • the controllable switch 30 as a control input 34, and is adapted to set either its first operative state or its second operative state in response to receiving a third control signal SC3 at its control input 34.
  • the controller 2 has a third control output 13 for providing the third control signal SC3.
  • the camera system 1 further has a switchable infrared light source 40, which is switchable on or off in response to fourth control signal SC4, which is provided by the controller 2 at a fourth control output 14. It is noted that suitable controllable infrared light sources are known per se, and that a more detailed explanation of the construction and operation of the infrared light source 40 is not necessary here.
  • the two cameras 10 and 20 are mutually not identical, but are specially designed for mutually different light conditions.
  • the first camera 10 is specially designed for circumstances with sufficient ambient light, and for that reason will be indicated by the phrase "day view camera”, while the second camera 20 is specially designed for dark circumstances, i.e. circumstances with only very little or no ambient light, and for that reason will be indicated by the phrase "night view camera” .
  • the day view camera 10 typically is a colour camera provided with an infrared filter
  • the night view camera typically is a monochromatic camera without an infrared filter.
  • the cameras typically may have a CCD-chip as light-sensitive element, but cameras with other light-sensitive elements are also suitable for use.
  • the controller 2 is adapted to generate its control signals SCl, SC2, SC3 , SC4, for the cameras 10, 20, the switch 30 and the infrared light source 40 on the basis of the amount of ambient light.
  • the camera system 1 comprises at least one light sensor 70, which provides a light signal SL, and the controller 2 has a sensor input 17 for receiving the measuring signal SL of the sensor 70
  • the controller 2 is adapted to provide its output signals depending on whether the ambient light level is above or below predetermined threshold levels.
  • the camera system 1 has a signal light sensor 70, of which the output signal is representative for the detected light intensity, and the controller 2 is adapted to compare the measuring signal received with predetermined reference values.
  • the light sensor is a sensor with a build-in threshold level, in which case the sensor provides an output signal with a first value if the detected light level is less then the threshold value concerned and has a second value if the detected level is higher then the threshold value concerned.
  • the comparison of the ambient light level with the predetermined threshold value in that case is therefore not executed by the controller but by the light sensor. Then, for each threshold value a separate light sensor is required, and for each light sensor the controller must have a signal input.
  • Figure 3 is a graphical representation illustrating the operation of an example of the camera system 1.
  • the horizontal axis represents time.
  • the ambient light intensity LN is set along the vertical axis in arbitrary units .
  • the operation will be explained for a scenario in the morning in which case the surroundings change from dark to light.
  • the increasing ambient light level is indicated with a curve 71 at the left hand side in the figure.
  • the ambient light level LN is lower than a first threshold level Ll.
  • the night view camera 20 is ON, the day view camera 10 is OUT, and the switch 30 is in its second switching state, so that the output signal SV2 of the second camera 20 is provided as output signal SV at the system output 3.
  • the controller 2 switches the day view camera 10 on, and switches the switch 30 to its first switch state, so that the system output 3 outputs the image signal SVl of the first camera 10.
  • the night view camera 20 can now be switched off.
  • the controller can switch off the night view camera 30 simultaneously with switching the day view camera 10 on, but it is also possible that the night view camera 20 is switched off a brief time later.
  • the controller 2 may implement a predetermined time delay, but it is also possible that the night view camera is switched off when the ambient light level LN passes a third threshold level L3 higher than the second threshold value L2 as illustrated in figure 4 at time t3.
  • controller 2 executes the switching of the switch 30 somewhat later than the switching on of the day view camera 10, for instance by implementing a predetermined time delay.
  • curve 72 illustrates the decreasing ambient light level LN.
  • the controller 2 switches the night view camera 20 STANDBY.
  • the controller 2 switches the night view camera 20 ON and the controller 2 switches the switch 30 to its second switching state.
  • the day view camera 10 can be switched off, either simultaneously with the switching of the switch 30, or at a somewhat later time t8.
  • a constant time delay may be implemented, or the day view camera 10 is only switched off when the ambient light level LN decreases below a threshold level L8 lower then the seventh threshold level L7.
  • the switch 30 may be switched to its second switching state simultaneously with the switching of the night view camera 20 or after a short time delay.
  • the threshold levels Ll and L2 used in the case of increasing light intensity are equal to the light levels L7 and L6 used in the case of decreasing light levels.
  • the second light level L2 is chosen equal to the seventh threshold level L7.
  • switching from the night view camera 20 to the day view camera 10 in the case of increasing light intensity takes place at the same light level L2/L7 as the switching from the day view camera 10 to the night view camera 20 in the case of decreasing light intensity.
  • the seventh threshold level L7 is lower than the second threshold level L2.
  • the controller 2 may switch ON the infrared light source 40 simultaneously with switching the night view camera 20 ON, i.e. at the time t7 when the decreasing light level LN passes the seventh threshold level L7. Then, switching OFF of the infrared light source 40 can take place simultaneously with switching the night view camera 20 OFF, i.e. at the time t2 when the increasing light level LN passes the second threshold level L2 , or at somewhat later time t3. Switching the infrared light source 40 is then coupled to the ON switching of the night view camera 20. However, it is also possible that the infrared light source 40 is already switched on during the twilight period, i.e. when the decreasing light level LN passes the sixth threshold value L6.
  • switching of the infrared light source 40 may be coupled to the switching of the night view camera 20 STANDBY/OFF. Then, as long as the night view camera 20 is STANDBY, the day view camera 10 already profits from the light emitted by the infrared light source 40.
  • the controller 2 is provided with a hysteresis facility to prevent undesirable switching behaviour. For instance, when the increasing light level LN passes the first threshold level Ll at time tl and the day view camera 10 is switched to its STANDBY state, it is possible that the ambient light level LN fluctuates, so that a short time later the ambient light level LN again decreases to below the first threshold level Ll.
  • the day view camera 10 could be switched again to its OFF state. Such frequently switching hither and back, however, is undesirable.
  • the controller 2 has a build- in time delay, which stops a switching back from the standby state to the off state during a predetermined time, and also the controller 2 may be provided with a build-in delay which stops the switching back from the ON state to the STANDBY state during a predetermined time.
  • the signal of the light level sensor 70 is averaged over a longer time, for instance an averaging time of 5 minutes, causing fast fluctuations to have little or no influence.
  • the eighth light level at which the day view camera 10 in the case of decreasing light level is switched to its OFF state is lower than the first threshold level Ll. Comparable remarks apply of course, mutatis mutandis, in relation to the STAND BY switching or OFF switching of the night view camera 20 around the sixth threshold level L6.
  • Figure 4 is a graphical illustration comparable to figure 3 of the operation of another embodiment of the camera system according to the present invention.
  • the controller 2 takes three successive threshold levels into account .
  • An increasing light level indicating the scenario in the morning is shown with curve 73 at the left hand side in figure 4, while a decreasing light level illustrating a scenario in the evening is shown with curve 74 at the right hand side in figure 4.
  • the day view camera 10 is OFF, the night view camera 20 is ON, and the switch 30 is in its second switching state.
  • the day view camera 10 is switched STANDBY.
  • the increasing light level LN subsequently passes the second threshold level L2 higher than the first threshold level Ll at a second time t2
  • the day view camera 10 is switched ON and the switch 30 is switched to its first switching state.
  • the switching of the switch 30 to its first switching state may happen somewhat later than switching the day view camera 10 on.
  • the night view camera 20 is now first switched back to its STANDBY state. Only when the increasing light level LN passes the third threshold value L3 higher then the second threshold value L2, the night view camera 20 is switched OFF.
  • switching the night view camera 20 from the ON state to the STANDBY state may take place simultaneously with switching the day view camera 10 from the STANDBY state to the ON state at time t2 , but it is also possible that switching the night view camera 20 occurs somewhat later.
  • the controller 2 may be provided with a timer, switching the night view camera 20 with a predetermined time delay after time t2, but it is also possible that switching the night view camera 20 STANDBY occurs on a time t4 when the increasing light level LN passes a fourth threshold level L4 higher than the second threshold level L2, as illustrated.
  • the operation is as follows. As long as the ambient light level LN is sufficiently high, the day view camera 10 is ON, the night view camera 20 is OFF, and the switch 30 is in its first switching state. When the ambient light level LN decreases to below a sixth threshold value L6, the night view camera 20 is switched STANDBY. When the decreasing light level LN subsequently passes a seventh threshold value L7 lower than the sixth threshold value L6, the night view camera 20 is switched ON and the switch 30 is switched to its second switching state. In this case, too, switching the switch 30 may take place with some delay.
  • the day view camera 10 may now be switched STANDBY. It is possible that this also takes place simultaneously with switching the night view camera 20 ON, or with switching the switch 30 to its second switching state if this happens later, but more in the illustrated variation the day view camera 10 is switched standby when the decreasing light level LN passes a ninth threshold value L9 lower than the seventh threshold value L7. In the border case, the ninth threshold level L9 thus is equal to the seventh threshold level L7. When subsequently the decreasing light level LN passes a tenth threshold level LlO lower than the ninth threshold level L9 at time tlO, the day view camera 10 is switched OFF.
  • the second threshold level L2, the fourth threshold level L4, the seventh threshold level L7, and the ninth threshold level L9 are mutually equal to each other
  • the fifth and sixth threshold level L5 and L6 are mutually equal to each other
  • the first and tenth threshold level Ll and LlO are mutually equal to each other.
  • the system distinguishes four ambient light conditions: a first condition “night” when the ambient light level LN is less than the first threshold value L1/L10; a second condition “twilight” when the ambient light level LN is between the first threshold value L1/L10 and the second threshold value L2/L4/L7/L9; a third condition “clouded” when -the ambient light level LN is between the second threshold value L2/L4/L7/L9 and the highest threshold value L5/L6; and the condition “daylight” when the ambient light level LN is above this highest threshold value L5/L6.
  • the switching moments in the case of decreasing light intensity do not coincide with the switching moments in the case of increasing light intensity. Therefore, it is preferred that the tenth threshold value LlO is somewhat lower than the first threshold value Ll, that the sixth threshold level L6 is somewhat lower than the fifth threshold level L5 , that the ninth threshold level L9 is somewhat lower than the second threshold level L2 , and that the seventh threshold level L7 is somewhat lower than the fourth threshold level L4.
  • the controller 2 may switch on the infrared light source 40 simultaneously with switching on the night view camera 20, i.e. at time t7.
  • the infrared light source 40 is already switched on earlier, simultaneously with switching the night view camera 20 STANDBY, i.e. on the sixth time t6.
  • Switching OFF of the infrared light source 40 may then take place simultaneously with the switching OFF of the night view camera 20, i.e. at the fifth time L5 , in which case undesirable switching behaviour of the infrared light source 40 is avoided if the fifth light level L5 is somewhat higher then the sixth light level L6.

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

Abstract

L'invention concerne un système d'appareils photo (1) comprenant : un premier appareil photo (10) pour donner des premiers signaux d'image ; un second appareil photo (20) pour donner des seconds signaux d'image ; une sortie (3) pour sortir des signaux d'image ; et au moins un capteur de niveau de lumière (70) pour donner un signal de niveau de lumière qui est représentatif d’un niveau de lumière ambiante. Le système d'appareils photo est adapté, selon le signal de niveau de lumière du capteur de niveau de lumière, à sortir soit les premiers signaux d'image du premier appareil photo (10), soit les seconds signaux d'image du second appareil photo (20) au niveau de la sortie (3).
PCT/NL2006/000638 2005-12-15 2006-12-15 Système d'appareils photo WO2007069892A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06835661A EP1972133A1 (fr) 2005-12-15 2006-12-15 Système d'appareils photo

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1030678 2005-12-15
NL1030678A NL1030678C1 (nl) 2005-12-15 2005-12-15 Camerasysteem.

Publications (1)

Publication Number Publication Date
WO2007069892A1 true WO2007069892A1 (fr) 2007-06-21

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PCT/NL2006/000638 WO2007069892A1 (fr) 2005-12-15 2006-12-15 Système d'appareils photo

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EP (1) EP1972133A1 (fr)
NL (1) NL1030678C1 (fr)
WO (1) WO2007069892A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020102110A1 (fr) * 2018-11-13 2020-05-22 Magic Leap, Inc. Caméra ir basée sur les événements
US11809613B2 (en) 2018-11-12 2023-11-07 Magic Leap, Inc. Event-based camera with high-resolution frame output
US11889209B2 (en) 2019-02-07 2024-01-30 Magic Leap, Inc. Lightweight cross reality device with passive depth extraction
US11902677B2 (en) 2018-11-12 2024-02-13 Magic Leap, Inc. Patch tracking image sensor
US11985440B2 (en) 2018-11-12 2024-05-14 Magic Leap, Inc. Depth based dynamic vision sensor
US12013979B2 (en) 2019-02-07 2024-06-18 Magic Leap, Inc. Lightweight and low power cross reality device with high temporal resolution
US12041380B2 (en) 2019-11-11 2024-07-16 Magic Leap, Inc. Event-based IR camera

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220198200A1 (en) * 2020-12-22 2022-06-23 Continental Automotive Systems, Inc. Road lane condition detection with lane assist for a vehicle using infrared detecting device

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2001010129A1 (fr) * 1999-07-29 2001-02-08 Insight Technologies, Inc. Dba Scopus Optoelectronic Systems Systeme de cameras compact multi-usage comprenant des cameras et des emetteurs infrarouges
WO2003043316A1 (fr) * 2001-11-15 2003-05-22 Gin J M Jack Systeme de surveillance et de commande a camera double
WO2005043890A1 (fr) * 2003-10-09 2005-05-12 Stereonics Limited Dispositif d'imagerie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001010129A1 (fr) * 1999-07-29 2001-02-08 Insight Technologies, Inc. Dba Scopus Optoelectronic Systems Systeme de cameras compact multi-usage comprenant des cameras et des emetteurs infrarouges
WO2003043316A1 (fr) * 2001-11-15 2003-05-22 Gin J M Jack Systeme de surveillance et de commande a camera double
WO2005043890A1 (fr) * 2003-10-09 2005-05-12 Stereonics Limited Dispositif d'imagerie

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11809613B2 (en) 2018-11-12 2023-11-07 Magic Leap, Inc. Event-based camera with high-resolution frame output
US11902677B2 (en) 2018-11-12 2024-02-13 Magic Leap, Inc. Patch tracking image sensor
US11985440B2 (en) 2018-11-12 2024-05-14 Magic Leap, Inc. Depth based dynamic vision sensor
WO2020102110A1 (fr) * 2018-11-13 2020-05-22 Magic Leap, Inc. Caméra ir basée sur les événements
US11889209B2 (en) 2019-02-07 2024-01-30 Magic Leap, Inc. Lightweight cross reality device with passive depth extraction
US12013979B2 (en) 2019-02-07 2024-06-18 Magic Leap, Inc. Lightweight and low power cross reality device with high temporal resolution
US12041380B2 (en) 2019-11-11 2024-07-16 Magic Leap, Inc. Event-based IR camera

Also Published As

Publication number Publication date
EP1972133A1 (fr) 2008-09-24
NL1030678C1 (nl) 2006-02-06

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