CN102695042B - Imageing sensor supervisory control system and method for supervising - Google Patents
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Abstract
A kind of imageing sensor supervisory control system and method for supervising, described method for supervising comprises: adopt low frame per second monitoring mode to monitor guarded region; Entering guarded region when finding that there is moving object, adopting high frame per second monitoring mode to monitor guarded region, and selectivity light filling is carried out to the guarded region under high frame per second monitoring mode.When guarded region being monitored owing to adopting low frame per second monitoring mode, the time for exposure of often taking piece image can be elongated, make the monitor image signal intensity obtained can become very large, even if do not need to carry out light filling in darker environment yet, power consumption can be reduced, and also can obtain high-quality monitoring image, also can see guarded region clearly; When discovery moving object enters guarded region, convert high frame per second monitoring mode again to monitor guarded region, and carry out optionally light filling, thus can ensure effectively to monitor the moving object of guarded region, round-the-clock monitoring can be realized, can power consumption be reduced again.
Description
Technical field
The present invention relates to monitoring technique, particularly a kind of imageing sensor supervisory control system and method for supervising.
Background technology
Present many public places and private site are all provided with the supervisory control system that imageing sensor, pyroelectric infrared sensor etc. are formed, described supervisory control system is utilized to monitor territory, limit area under one's jurisdiction, when finding that there is people and entering guarded region, supervisory control system sends warning, reminds the region of Security Personnel to correspondence to check.
Described pyroelectric infrared sensor is the detecting element be made up of the material of high Seebeck coefficient (as lithium tantalate), utilize described pyroelectric infrared sensor that the infrared radiation received is transformed into faint voltage signal, through amplifying backward outer output, thus the action of people in certain limit can be detected, and then give the alarm.Described pyroelectric infrared sensor is owing to adopting passive detection, and therefore power consumption is very low, and device cost is very low.But described pyroelectric infrared sensor also has a lot of shortcoming, first poor anti jamming capability, when various thermal source (as toy) appears in the monitoring range of pyroelectric infrared sensor, the supervisory control system utilizing described pyroelectric infrared sensor to make also can be reported by mistake, bring very large inconvenience to the work of Security Personnel, cause the waste of human resources; And infrared being easy to that human body sends is blocked, thus cannot detect; When ambient temperature and human body temperature similar time, pyroelectric infrared sensor will be malfunctioning, cannot give the alarm.
And adopt the supervisory control system based on imageing sensor, because monitoring imageing sensor cost is higher, cannot high-density installation be realized.And traditional monitoring imageing sensor is normally monitored guarded region under high frame per second monitoring mode, the frame per second of existing imageing sensor is generally 25fps or 30fps, owing to being only more than or equal to 25fps, monitoring image information is just coherent, be conducive to realizing the real-time monitoring to guarded region, but the image sensor sensitivity under high frame per second monitoring mode is lower, when dark, need the very strong infrared light of a direct subsidy could realize effective monitoring, but this can increase system cost, make system power dissipation greatly increase simultaneously.
More supervising devices about having image sensing cell please refer to the Chinese patent literature that application number is 200810188857.5.
Summary of the invention
The problem that the present invention solves is to provide a kind of imageing sensor supervisory control system and method for supervising, can reduce power consumption and can realize round-the-clock monitoring again.
For solving the problem, technical solution of the present invention provides a kind of method for supervising, comprising:
Low frame per second monitoring mode is adopted to monitor guarded region;
Entering guarded region when finding that there is moving object, adopting high frame per second monitoring mode to monitor guarded region, and selectivity light filling is carried out to the guarded region under high frame per second monitoring mode.
Optionally, also comprise: ambient light intensity is detected.
Optionally, at interval of a period of time, ambient light intensity is detected, if the ambient light intensity obtained recently is lower than standard light line strength, low frame per second monitoring mode is then adopted to monitor guarded region, when discovery moving object enters guarded region, higher frame per second monitoring mode is adopted to monitor guarded region; If the ambient light intensity obtained recently is equal to or higher than standard light line strength, then high frame per second monitoring mode is adopted to monitor guarded region.
Optionally, at interval of a period of time, ambient light intensity is detected, when the ambient light intensity obtained recently is lower than standard light line strength, find that there is after moving object enters guarded region, adopt high frame per second monitoring mode, and light filling is carried out to guarded region; When the ambient light intensity obtained recently is equal to or higher than standard light line strength, find that there is after moving object enters guarded region, adopt high frame per second monitoring mode, to guarded region not light filling.
Optionally, after finding that there is moving object and entering guarded region, ambient light intensity being detected, when the ambient light intensity detected is lower than standard light line strength, when adopting high frame per second monitoring mode, light filling being carried out to guarded region; When the ambient light intensity detected is equal to or higher than standard light line strength, when adopting high frame per second monitoring mode, to guarded region not light filling.
Optionally, the described light for light filling is infrared light or visible ray.
Optionally, according to the ambient light intensity detected, the monitor image signal intensity collected by change time for exposure, picture signal gain, aperture size adjustment.
Optionally, according to the time, selectivity light filling is carried out to the guarded region under high frame per second monitoring mode.
Optionally, according to selection of time be adopt low frame per second monitoring mode guarded region is monitored, when discovery moving object enters guarded region, then adopt high frame per second monitoring mode to monitor guarded region, still adopt high frame per second monitoring mode to monitor guarded region.
Optionally, utilize background subtraction, frame differential method or optical flow method to detect the monitoring image obtained, judged whether that moving object enters guarded region.
Optionally, when moving object enters guarded region, give the alarm.
Optionally, according to the monitor image signal of high frame per second monitoring mode, judge whether moving object is illegally enter.
Optionally, the frame per second that described low frame per second monitoring mode adopts is less than 25fps.
Optionally, the frame per second that described low frame per second monitoring mode adopts is less than or equal to 1fps.
Optionally, the frame per second that described high frame per second monitoring mode adopts is more than or equal to 25fps.
Technical solution of the present invention additionally provides a kind of imageing sensor supervisory control system, comprising:
Image sensing cell, for obtaining the picture signal of guarded region;
Low frame per second monitoring unit, monitors under low frame per second monitoring mode for controlling image sensing cell;
High frame per second monitoring unit, monitors under high frame per second monitoring mode for controlling image sensing cell;
Motion detection unit, carries out motion detection to the picture signal obtained under low frame per second monitoring mode, and when detecting that moving object enters guarded region, motion detection unit outputs signal, and adopts high frame per second monitoring mode to monitor guarded region;
Light filling judging unit, needs to carry out light filling to guarded region for judging whether;
Light filling unit, the judged result according to light filling judging unit carries out light filling to guarded region;
Display unit, shows the monitor image signal of the low frame per second monitoring mode obtained or high frame per second monitoring mode.
Optionally, described light filling judging unit comprises light-metering unit, by detecting ambient light intensity, and ambient light intensity and standard light line strength is compared, and judges whether to need to carry out light filling to guarded region.
Optionally, described light filling judging unit comprises clock, by obtaining the current time, judges whether to carry out light filling to guarded region according to the described time.
Optionally, the described light for light filling is infrared ray or visible ray.
Optionally, the monitor image signal of acquisition by wire transmission mode or wireless transmission to display unit.
Optionally, described image sensing cell is cmos image sensing unit or ccd image sensing unit.
Optionally, the resolution of described image sensing cell is 240 × 320 or is less than 240 × 320.
Optionally, the Pixel Dimensions of described image sensing cell is equal to or greater than 12 μm × 12 μm.
Optionally, the frame per second that described low frame per second monitoring unit control image sensing cell adopts under low frame per second monitoring mode is less than 25fps.
Optionally, the frame per second that described low frame per second monitoring unit control image sensing cell adopts under low frame per second monitoring mode is less than or equal to 1fps.
Optionally, the frame per second that described high frame per second monitoring unit control image sensing cell adopts under high frame per second monitoring mode is more than or equal to 25fps.
Compared with prior art, the present invention has the following advantages:
The method for supervising of the embodiment of the present invention comprises: adopt low frame per second monitoring mode to monitor guarded region; Entering guarded region when finding that there is moving object, adopting high frame per second monitoring mode to monitor guarded region, and selectivity light filling is carried out to the guarded region under high frame per second monitoring mode.When guarded region being monitored owing to adopting low frame per second monitoring mode, the time for exposure of often taking a two field picture can be elongated, make the monitor image signal intensity obtained can become very large, even if do not need to carry out light filling in darker environment yet, power consumption can be reduced, and also can obtain high-quality monitoring image, also can see guarded region clearly; When discovery moving object enters guarded region, convert high frame per second monitoring mode again to monitor guarded region, and carry out optionally light filling, thus can ensure effectively to monitor the moving object of guarded region, round-the-clock monitoring can be realized, can power consumption be reduced again.
The imageing sensor supervisory control system of the embodiment of the present invention comprises image sensing cell, low frame per second monitoring unit, motion detection unit, light filling judging unit, light filling unit, high frame per second monitoring unit and display unit, the frame per second adopted under low frame per second monitoring mode due to the low frame per second monitoring unit control image sensing cell of the embodiment of the present invention is less than 25fps, even be less than or equal to 1fps, can improve the time for exposure of often taking a two field picture can be elongated, the monitor image signal intensity obtained under making low frame per second monitoring mode can become very large, even if do not need to carry out light filling in darker environment yet.Find that when utilizing motion detection unit moving object enters guarded region, convert high frame per second monitoring mode to by high frame per second monitoring unit again to monitor guarded region, and carry out optionally light filling, thus can ensure effectively to monitor the moving object of guarded region, round-the-clock monitoring can be realized, can power consumption be reduced again.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for supervising of the embodiment of the present invention;
Fig. 2 is the structural representation of the imageing sensor supervisory control system of the embodiment of the present invention.
Embodiment
Monitoring imageing sensor due to prior art adopts the monitoring mode of high frame per second usually, but the image sensor sensitivity under high frame per second monitoring mode is lower, when dark, need the very strong infrared light of a direct subsidy could realize effective monitoring, but this can increase system cost, make system power dissipation greatly increase simultaneously.For this reason, embodiments provide a kind of imageing sensor supervisory control system and method for supervising, described method for supervising comprises: adopt low frame per second monitoring mode to monitor guarded region; Entering guarded region when finding that there is moving object, adopting high frame per second monitoring mode to monitor guarded region, and selectivity light filling is carried out to the guarded region under high frame per second monitoring mode.When guarded region being monitored owing to adopting low frame per second monitoring mode, the time for exposure of often taking piece image can be elongated, make the monitor image signal intensity obtained can become very large, even if do not need to carry out light filling in darker environment yet, can power consumption be reduced, also can see guarded region clearly; When discovery moving object enters guarded region, convert high frame per second monitoring mode again to monitor guarded region, and carry out optionally light filling, thus can ensure effectively to monitor the moving object of guarded region, round-the-clock monitoring can be realized, can power consumption be reduced again.
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
The embodiment of the present invention provide firstly a kind of method for supervising, please refer to Fig. 1, is the schematic flow sheet of the method for supervising of the embodiment of the present invention, specifically comprises:
Step S101, adopts low frame per second monitoring mode to monitor guarded region;
Whether step S102, detect and have moving object to enter guarded region, if there is moving object to enter guarded region, then forwarding step S103 to, when not having moving object to enter guarded region, getting back to step S101, continues monitoring;
Step S103, detects ambient light intensity, and ambient light intensity and standard light line strength is compared, if ambient light intensity is lower than standard light line strength, forward step S104 to, if ambient light intensity is equal to or higher than standard light line strength, then forward step S105 to;
Step S104, carries out light filling to guarded region;
Step S105, adopts high frame per second monitoring mode to monitor guarded region;
Step S106, according to the monitor image signal of high frame per second monitoring mode, judges whether moving object is illegally enter.
Concrete, perform step S101, adopt low frame per second monitoring mode to monitor guarded region.
The supervisory control system that the embodiment of the present invention adopts is the supervisory control system based on imageing sensor, existing monitoring imageing sensor adopts 25fps(frame/second usually) or higher fixing frame per second, owing to only adopting 25fps(frame/second) or higher fixing frame per second, the image demonstrated is just coherent, and supervisory control system could be monitored guarded region effectively.But due to imageing sensor adopt the fixing frame per second of 25fps time, the time for exposure of the image of each frame is no more than at most 0.04 second, and the monitor image signal intensity that imageing sensor obtains is more weak.Especially, when guarded region is darker, even if be transferred to maximum by the aperture of supervisory control system camera lens, gain, the monitor image signal intensity that imageing sensor obtains is very weak, effectively can not monitor the guarded region of dark area.And if adopt infrared light filling, need the very strong infrared light of a direct subsidy could realize effective monitoring, but this can increase system cost, makes system power dissipation greatly increase simultaneously.Because supervisory control system is all in blank state at most of time, only just need when pedestrian, vehicle etc. appear in guarded region to carry out light filling to guarded region, carefully monitor guarded region, the power consumption of therefore carrying out light filling to guarded region in most of time is all waste.
In embodiments of the present invention, in supervisory control system, normal monitoring adopts low frame per second monitoring mode, the frame per second of image sensing cell is lower than the fixing frame per second of the monitoring imageing sensor of prior art, namely the frame per second that described low frame per second monitoring mode hypograph transducer adopts is less than 25fps, such as, be 1fps, 5fps, 10fps etc.In other embodiments, the frame per second that described low frame per second monitoring mode hypograph transducer adopts can also be less than 1fps, such as 0.5fps, 0.25fps etc.When the frame per second of described image sensing cell is lower, be such as 1fps, the time for exposure of the image of each frame can reach 1 second at most, the image exposuring time being 25fps than the frame per second of prior art improves 25 times, the monitor image signal intensity that imageing sensor obtains is made to improve 25 times, thus be conducive to effectively monitoring comparatively dark guarded region, be conducive to realizing round-the-clock monitoring, and do not need to carry out light filling to guarded region during normal monitoring, the energy consumption of supervisory control system can be reduced.
In the present embodiment, the image sensing cell of described supervisory control system all adopts low frame per second monitoring mode to monitor guarded region in normal operational environment, only having when finding that moving object enters guarded region, just converting high frame per second monitoring mode to and guarded region is monitored.When guarded region is very bright, AEC(auto-exposure control can be adopted), AGC(automatic growth control), AIC(auto iris control) etc. method, namely by reducing the time for exposure, picture signal gain, the size that reduces the aperture of camera lens reduce the image intensity signal that image sensing cell obtains, the image intensity signal that imageing sensor is obtained remains on a particular value, makes when guarded region is very bright, and low frame per second monitoring mode still can be adopted to monitor guarded region.When guarded region is very dark, also can adopt AEC(auto-exposure control), AGC(automatic growth control), AIC(auto iris control) etc. method moderately improve imageing sensor obtain image intensity signal.
In other embodiments, can also detect ambient light intensity at interval of a period of time, such as every 10 minutes or 30 minutes, one-time detection is carried out to ambient light intensity, and the ambient light intensity obtained recently and standard light line strength are compared, if ambient light intensity is lower than standard light line strength, then adopt low frame per second monitoring mode to monitor guarded region, when discovery moving object enters guarded region, then adopt high frame per second monitoring mode to monitor guarded region; If the ambient light intensity obtained recently is equal to or higher than standard light line strength, then high frame per second monitoring mode is adopted to monitor guarded region.Described standard light line strength is the light intensity of a setting, the light intensity that the minimum image signal intensity needed for supervisory control system display monitoring image is corresponding.In the present embodiment, described standard light line strength is 10lux.
In other embodiments, the monitoring mode of imageing sensor can also be adjusted according to the time.Such as, be the morning 6 up to afternoon 6 time when the time, the imageing sensor of supervisory control system adopts high frame per second monitoring mode to monitor guarded region; Be afternoon 6 up to the morning 6 time when the time, the imageing sensor of supervisory control system adopts low frame per second monitoring mode to monitor guarded region, when discovery moving object enters guarded region, then adopts high frame per second monitoring mode to monitor guarded region.The picture continuity of monitoring image can be improved by day, the energy consumption of supervisory control system can also be reduced at night.In other embodiments, also can according to other time period to the monitoring mode adopting low frame per second or high frame per second respectively.
Perform step S102, detect and whether have moving object to enter guarded region, if there is moving object to enter guarded region, then forwarding step S103 to, when not having moving object to enter guarded region, getting back to step S101, continue monitoring.
The method of the monitoring image under low frame per second monitoring mode being carried out to the detection of moving object comprises background subtraction (backgroundsubtraction), frame differential method (temporaldifferencing), optical flow method (opticalflow) etc.
In embodiments of the present invention, the method of the monitoring image under low frame per second monitoring mode being carried out to the detection of moving object is background subtraction, specifically comprise: provide a background image, described background image is the image of the guarded region not comprising the moving object such as people, automobile; The monitoring image photographed under low frame per second monitoring mode and background image are carried out calculus of differences in real time, preserves the absolute value of difference result with a new difference image; In described difference image, when the value of pixel is less than or equal to a particular value, then think that the pixel of same position belongs to background area in monitoring image, when the value of pixel is greater than a particular value, then think that the pixel of same position belongs to moving object region in monitoring image.When finding that the pixel in monitoring image belongs to moving object region, then think and have moving object to enter guarded region.In embodiments of the present invention, described moving object comprises all moving objects such as people, automobile, animal.Guarded region is entered when there being moving object, in order to the action of moving object effectively can be monitored, need the everything of monitoring moving object, therefore, imageing sensor needs to be adjusted to the high frame per second monitoring mode of employing, and optionally light filling is carried out to guarded region, make also to carry out effective monitoring to guarded region at night.
In other embodiments, when the method for the guarded region under low frame per second monitoring mode being carried out to the detection of moving object is frame differential method, specifically comprise: calculus of differences is carried out to two width adjacent in monitoring image sequence or three width images, judge whether that moving object enters guarded region, and utilize frame differential method can also detect the profile information of moving object, someone enters guarded region to utilize described profile information to judge whether, only have people to enter guarded region and just remind Security Personnel, avoid bird, when kittens etc. enter guarded region, supervisory control system also gives the alarm and reminds Security Personnel, the workload of Security Personnel can be reduced, make supervisory control system more intelligent.In the present embodiment, described moving object can be all moving objects such as people, automobile, animal, can be only also people.Guarded region is entered when there being moving object, in order to the action of moving object effectively can be monitored, need the everything of monitoring moving object, imageing sensor needs to be adjusted to the high frame per second monitoring mode of employing, and optionally light filling is carried out to guarded region, make also to carry out effective monitoring to guarded region at night.
Perform step S103, ambient light intensity is detected, and ambient light intensity and standard light line strength are compared, if ambient light intensity is lower than standard light line strength, forward step S104 to, if ambient light intensity is equal to or higher than standard light line strength, then forward step S105 to.
In embodiments of the present invention, after having moving object to enter guarded region, ambient light intensity is detected, and the ambient light intensity detected and standard light line strength are compared.If ambient light intensity is lower than standard light line strength, then light filling is carried out to guarded region, if ambient light intensity is equal to or higher than standard light line strength, then do not need to carry out light filling to guarded region.Described standard light line strength is the light intensity of a setting, the light intensity that the minimum image signal intensity needed for supervisory control system display monitoring image is corresponding.In the present embodiment, described standard light line strength is 10lux.
In other embodiments, at interval of a period of time, ambient light intensity is detected, such as every 10 minutes or 30 minutes, one-time detection is carried out to ambient light intensity, when having monitored after moving object enters guarded region, directly can utilize and the ambient light intensity recorded recently and standard light line strength have been compared.If the ambient light intensity recorded recently is lower than standard light line strength, then light filling is carried out to guarded region, if the ambient light intensity recorded recently is equal to or higher than standard light line strength, then do not need to monitor guarded region.What the embodiment of the present invention detected ambient light intensity operates in have monitored before moving object enters guarded region and completes, when having monitored after moving object enters guarded region, the ambient light intensity that records recently and standard light line strength can be directly utilized to compare, and can judge the need of light filling rapidly, improve the reaction time of light filling, be conducive to monitoring guarded region.
In other embodiments, can also judge whether to need to carry out light filling to guarded region according to the time.Such as, be the morning 6 up to afternoon 6 time when the time, monitored after moving object enters guarded region, light filling has not been carried out to guarded region; Be afternoon 6 up to the morning 6 time when the time, monitored after moving object enters guarded region, light filling is carried out to guarded region.
Due to only at dark and monitored after moving object enters guarded region, just need to carry out light filling to guarded region, do not need light filling at other times, the energy consumption of supervisory control system can be reduced greatly.
Perform step S104, light filling is carried out to guarded region.
The described light for light filling is infrared light or visible ray.In the present embodiment, the described light intensity for light filling is fixed, and in other embodiments, the described light intensity for light filling is transformable, environmentally can adjust the light intensity of light filling by light intensity.When ambient light intensity is more weak, appropriateness the light intensity of light filling can be improved, when ambient light intensity dies down relatively, appropriateness the light intensity of light filling can be reduced, guarded region under dark state clearly can be monitored, the power consumption of light filling can be saved again.In the present embodiment, the described light for light filling is sent by infrared LEDs lamp.
Perform step S105, adopt high frame per second monitoring mode to monitor guarded region.
When having detected that moving object enters guarded region, in order to effectively monitor the action of moving object, need the everything of monitoring moving object, imageing sensor needs to be adjusted to the high frame per second monitoring mode of employing.In the present embodiment, the frame per second that described high frame per second monitoring mode hypograph transducer adopts is 25fps, and in other embodiments, the frame per second that described high frame per second monitoring mode hypograph transducer adopts is greater than 25fps, such as 30fps, 50fps etc.
In the present embodiment, after having detected that moving object enters guarded region, judge to need to carry out light filling to guarded region, while light filling is carried out to guarded region, imageing sensor is adjusted to high frame per second monitoring mode, adopt high frame per second monitoring mode to monitor guarded region, display unit is transformed into the process of high frame per second monitoring mode from low frame per second monitoring mode and still effectively can monitors guarded region.
In other embodiments, describedly carry out light filling to guarded region and imageing sensor be adjusted to high frame per second monitoring mode also can not simultaneously carrying out.
In other embodiments, notice that in order to remind Security Personnel guarded region has moving object, when having detected that moving object enters guarded region, supervisory control system has given the alarm, Security Personnel can be noticed there is moving object in guarded region, to ensure that Security Personnel can react rapidly.
Perform step S106, according to the monitor image signal of high frame per second monitoring mode, judge whether moving object is illegally enter.
Security Personnel checks according to the monitor image signal of high frame per second monitoring mode, or guarded region of sending someone carries out scene inquiry.After discovery moving object is not illegally enter or driven away moving object or control, the imageing sensor of supervisory control system is readjusted into low frame per second monitoring mode.
When under high frame per second monitoring mode, supervisory control system has carried out light filling to guarded region, the imageing sensor of supervisory control system is readjusted into after low frame per second monitoring mode, stop light filling.
In other embodiments, after discovery moving object is not illegally enter or driven away moving object or control, sound all clear.
The embodiment of the present invention additionally provides a kind of imageing sensor supervisory control system, please refer to Fig. 2, is the structural representation of the imageing sensor supervisory control system of the embodiment of the present invention, comprises: image sensing cell 210, for obtaining the picture signal of guarded region; Low frame per second monitoring unit 220, monitors under low frame per second monitoring mode for controlling image sensing cell; Motion detection unit 230, carries out motion detection to the picture signal obtained under low frame per second monitoring mode, and when detecting that moving object enters guarded region, motion detection unit outputs signal, and adopts high frame per second monitoring mode to monitor guarded region; Light filling judging unit 240, needs to carry out light filling to guarded region for judging whether; Light filling unit 250, the judged result according to light filling judging unit carries out light filling to guarded region; High frame per second monitoring unit 260, monitors under high frame per second monitoring mode for controlling image sensing cell; Display unit 270, shows the monitor image signal of the low frame per second monitoring mode obtained or high frame per second monitoring mode.
Concrete, described image sensing cell 210 can be cmos image sensing unit or ccd image sensing unit.In the present embodiment, described image sensing cell 210 is cmos image sensing unit, the resolution of described cmos image sensing unit is 240 × 320 or is less than 240 × 320, concrete, described cmos image sensing unit can adopt QVGA(QuarterVideoGraphicsArray, 240 × 320), QCIF(Quartercommonintermediateformat, 176 × 144), QQVGA(QuarterQuarterVideoGraphicsArray, 160 × 120) pattern matrix such as.Due to resolution be 240 × 320 or the imageing sensor cost of the pattern matrix that is less than 240 × 320 lower, be conducive to realizing highdensity installation, and it is less to obtain the requirement of picture signal to transmission bandwidth, the monitor image signal obtained can by wire transmission mode or wireless transmission to display unit 270, thus can make supervisory control system can be installed in any place, make supervisory control system more flexible.Described wire transmission mode comprises twisted-pair feeder, coaxial cable, optical fiber etc., and described wireless transmission method comprises the communication modes such as infrared communication, bluetooth, WLAN, Wifi.In other embodiments, the resolution of described cmos image sensing unit can also be greater than 240 × 320.
In the prior art, the Pixel Dimensions of monitoring imageing sensor is generally 6 μm × 6 μm, in embodiments of the present invention, the Pixel Dimensions of described cmos image sensing unit is 12 μm × 12 μm, in other embodiments, the Pixel Dimensions of described cmos image sensing unit can also be greater than 12 μm × 12 μm.Because Pixel Dimensions is larger, the obtainable light intensity of each pixel is larger, and the sensitivity of imageing sensor is higher, is conducive to also obtaining high-quality image in darker environment.
Described image sensing cell 210 also comprises camera lens (not shown), utilize described camera lens that the IMAQ of guarded region is formed monitor image signal in image sensing cell 210, and shown to display unit 270 by wire transmission mode or wireless transmission.Described camera lens can also be connected with modules such as auto-exposure control module (not shown), auto iris control modules (not shown), described auto-exposure control module, auto iris control module are adjusted time for exposure of optical lens, aperture size, makes imageing sensor to obtain high-quality monitoring image.
In other embodiments, described image sensing cell be also connected automatic growth control module (not shown) between display unit, utilize described automatic growth control module that the monitor image signal that image sensing cell obtains is carried out to gain expansion or reduces, make display unit to show high-quality monitoring image.
Described low frame per second monitoring unit 220 is connected with image sensing cell 210, and low frame per second monitoring unit 220 can be utilized to adjust the frame per second of image sensing cell 210, and image sensing cell 210 can be worked under low frame per second monitoring mode, obtains monitoring image.Described low frame per second monitoring unit 220 controls the frame per second that image sensing cell 210 adopts under low frame per second monitoring mode and is less than 25fps, such as, be 1fps, 5fps, 10fps etc.In other embodiments, described low frame per second monitoring unit can also control the frame per second that image sensing cell adopts under low frame per second monitoring mode and is less than 1fps, such as 0.5fps, 0.25fps etc.When frame per second due to image sensing cell is lower, be such as 1fps, the time for exposure of the image of each frame can reach 1 second at most, the image exposuring time being 25fps than the frame per second of prior art improves 25 times, make the monitor image signal intensity that image sensing cell obtains improve 25 times, thus be conducive to effectively monitoring comparatively dark guarded region, realize round-the-clock monitoring, and do not need to carry out light filling to guarded region, the energy consumption of supervisory control system can be reduced.
When guarded region is very bright, can by reducing the time for exposure, picture signal gain, the size that reduces the aperture of camera lens reduce the image intensity signal that imageing sensor obtains, the image intensity signal that imageing sensor is obtained remains on a particular value, make when guarded region is very bright, low frame per second monitoring mode still can be adopted to monitor guarded region.
Described motion detection unit 230 is connected with low frame per second monitoring unit 220, and described motion detection unit 230 carries out motion detection to the picture signal obtained under low frame per second monitoring mode.
The method of the motion detection that described motion detection unit 230 adopts comprises background subtraction (backgroundsubtraction), frame differential method (temporaldifferencing), optical flow method (opticalflow) etc.In embodiments of the present invention, the method of the guarded region under low frame per second monitoring mode being carried out to the detection of moving object is background subtraction, the monitoring image photographed under low frame per second monitoring mode and background image are compared in real time, has judged whether that moving object enters guarded region.
In other embodiments, when the method for the guarded region under low frame per second monitoring mode being carried out to the detection of moving object also can be frame differential method, calculus of differences is carried out to two width adjacent in monitoring image sequence or three width images, the difference of two field picture before and after judging, to have judged whether that moving object enters guarded region.
Enter guarded region when described motion detection unit 230 finds that there is moving object, control signal is sent to light filling judging unit 240, to judge whether to need to carry out light filling to guarded region.Enter guarded region when described motion detection unit 230 does not find that there is moving object, the picture signal continued low frame per second monitoring unit 220 obtains carries out motion detection.
In other embodiments, when described motion detection unit finds that there is the condition obtained before moving object enters guarded region the need of light filling, such as judge not need to carry out light filling according to current time or ambient light intensity, then motion detection unit sends control signal directly to high frame per second monitoring unit, and high frame per second monitoring unit controls image sensing cell and monitors guarded region under high frame per second monitoring mode.Need to carry out light filling according to current time or ambient light intensity when described motion detection unit finds that there is before moving object enters guarded region, then motion detection unit sends control signal to light filling unit and high frame per second monitoring unit, light filling unit carries out light filling to guarded region, and high frame per second monitoring unit control image sensing cell is monitored guarded region under high frame per second monitoring mode.
In other embodiments, described motion detection unit is directly connected with image sensing cell, when motion detection unit finds that there is moving object enter guarded region according to obtaining image information from image sensing cell, send control signal to high frame per second monitoring unit, make high frame per second monitoring unit control image sensing cell and under high frame per second monitoring mode, guarded region is monitored.
Described light filling judging unit 240 judged whether to need to carry out light filling to guarded region according to time or ambient light intensity.In the present embodiment, described light filling judging unit 240 comprises light-metering unit, and described light-metering unit is optical sensor, by detecting ambient light intensity, and ambient light intensity and standard light line strength are compared, judge whether to need to carry out light filling to guarded region.If ambient light intensity is lower than standard light line strength, then needs to carry out light filling to guarded region, send control signal to light filling unit 250, make light filling unit carry out light filling; If ambient light intensity is equal to or higher than standard light line strength, does not then need to carry out light filling to guarded region, do not send control signal to light filling unit 250.
In other embodiments, described light filling judging unit 240 comprises clock, by obtaining the current time, can judge whether to need to carry out light filling to guarded region according to the time.Such as, be the morning 6 up to afternoon 6 time when the time, monitored after moving object enters guarded region, light filling has not been carried out to guarded region, do not send control signal to light filling unit; Be afternoon 6 up to the morning 6 time when the time, monitored after moving object enters guarded region, light filling has been carried out to guarded region, sends control signal to light filling unit.
Described light filling unit 250 is connected with light filling judging unit 240, can produce the bulb of infrared ray or visible ray, fluorescent tube, LED, and in embodiments of the present invention, described light filling unit 250 is infrared LEDs lamp.Because infrared ray can not be identified by the human eye, utilizing infrared ray to carry out light filling can not disturbed motion object, if there is people illegally to enter, can monitor illegal incomer while not alarming illegal incomer, and by sending Security Personnel go on-the-spot expulsion or control illegal incomer to reach antitheft object.
In other embodiments, the light intensity that described light filling unit is used for light filling is transformable, environmentally can adjust the light intensity of light filling by light intensity.When ambient light intensity is more weak, the light intensity of light filling can be improved, when ambient light intensity is more weak, the light intensity of light filling can be reduced, the guarded region under dark state clearly can be monitored, the power consumption of light filling can be saved again.
Described high frame per second monitoring unit 260 is connected with light filling judging unit 240, light filling unit 250 with image sensing cell 210, when light filling judging unit 240 judges that guarded region does not need to carry out light filling, light filling judging unit 240 sends control signal to high frame per second monitoring unit 260, utilize high frame per second monitoring unit 260 to control image sensing cell 210 to work under high frame per second monitoring mode, obtain monitoring image; When light filling judging unit 240 judges that guarded region needs to carry out light filling, light filling unit 250 carries out light filling to guarded region, and light filling unit 250 sends control signal to high frame per second monitoring unit 260, utilize high frame per second monitoring unit 260 to control image sensing cell 210 to work under high frame per second monitoring mode, obtain monitoring image.In other embodiments, when light filling judging unit judges that guarded region needs to carry out light filling, light filling unit carries out light filling to guarded region, and light filling judging unit sends control signal to high frame per second monitoring unit, utilize high frame per second monitoring unit to control image sensing cell to work under high frame per second monitoring mode, obtain monitoring image.
In the embodiment of the present invention, the frame per second that described high frame per second monitoring unit 260 control chart image-position sensor adopts under high frame per second monitoring mode is more than or equal to 25fps, such as, be 25fps, 30fps, 50fps etc.
Described display unit 270 is connected with high frame per second monitoring unit 260, low frame per second monitoring unit 220, show the monitor image signal of the low frame per second monitoring mode obtained or high frame per second monitoring mode, monitor image signal is transferred to display unit 270 by wire transmission mode or wireless transmission method by described high frame per second monitoring unit 260, low frame per second monitoring unit 220.In the present embodiment, the monitor image signal of described low frame per second monitoring mode and high frame per second monitoring mode all shows on display unit 270.In other embodiments, only find that there is moving object and enter guarded region, just the monitor image signal that high frame per second monitoring unit obtains is shown on the display unit.
In other embodiments, described display unit is directly connected with image sensing cell, sends the picture signal that image sensing cell obtains to display unit show by the control of high frame per second monitoring unit or low frame per second monitoring unit.
In other embodiments, described imageing sensor supervisory control system 20 also comprises alarm unit (not shown), described alarm unit is connected with motion detection unit 230, guarded region is entered when motion detection unit 230 finds that there is moving object, alarm unit gives the alarm, and reacts rapidly to remind Security Personnel.
To sum up, the method for supervising of the embodiment of the present invention comprises: adopt low frame per second monitoring mode to monitor guarded region; Entering guarded region when finding that there is moving object, adopting high frame per second monitoring mode to monitor guarded region, and selectivity light filling is carried out to the guarded region under high frame per second monitoring mode.When guarded region being monitored owing to adopting low frame per second monitoring mode, the time for exposure of often taking a two field picture can be elongated, make the monitor image signal intensity obtained can become very large, even if do not need to carry out light filling in darker environment yet, power consumption can be reduced, and also can obtain high-quality monitoring image, also can see guarded region clearly; When discovery moving object enters guarded region, convert high frame per second monitoring mode again to monitor guarded region, and carry out optionally light filling, thus can ensure effectively to monitor the moving object of guarded region, round-the-clock monitoring can be realized, can power consumption be reduced again.
The imageing sensor supervisory control system of the embodiment of the present invention comprises image sensing cell, low frame per second monitoring unit, motion detection unit, light filling judging unit, light filling unit, high frame per second monitoring unit and display unit, the frame per second adopted under low frame per second monitoring mode due to the low frame per second monitoring unit control image sensing cell of the embodiment of the present invention is less than 25fps, even be less than or equal to 1fps, can improve the time for exposure of often taking a two field picture can be elongated, the monitor image signal intensity obtained under making low frame per second monitoring mode can become very large, even if do not need to carry out light filling in darker environment yet.Find that when utilizing motion detection unit moving object enters guarded region, convert high frame per second monitoring mode to by high frame per second monitoring unit again to monitor guarded region, and carry out optionally light filling, thus can ensure effectively to monitor the moving object of guarded region, round-the-clock monitoring can be realized, can power consumption be reduced again.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (22)
1. a method for supervising, is characterized in that, obtained the picture signal of guarded region by image sensing cell, the Pixel Dimensions of described image sensing cell is equal to or greater than 12 μm × 12 μm, and described method for supervising comprises:
At interval of a period of time, ambient light intensity is detected;
The intensity of the ambient light obtained recently and standard light line strength are compared;
If the ambient light intensity of described nearest acquisition is lower than standard light line strength, low frame per second monitoring mode is adopted to monitor guarded region; Entering guarded region when finding that there is moving object, adopting high frame per second monitoring mode to monitor guarded region, and selectivity light filling is carried out to the guarded region under high frame per second monitoring mode;
If the ambient light intensity of described nearest acquisition is equal to or higher than standard light line strength, entering guarded region when finding that there is moving object, adopting high frame per second monitoring mode to monitor guarded region.
2. method for supervising as claimed in claim 1, it is characterized in that, at interval of a period of time, ambient light intensity is detected, if the ambient light intensity obtained recently is lower than standard light line strength, low frame per second monitoring mode is then adopted to monitor guarded region, when discovery moving object enters guarded region, higher frame per second monitoring mode is adopted to monitor guarded region; If the ambient light intensity obtained recently is equal to or higher than standard light line strength, then high frame per second monitoring mode is adopted to monitor guarded region.
3. method for supervising as claimed in claim 1, is characterized in that, after finding that there is moving object and entering guarded region, ambient light intensity is detected, when the ambient light intensity detected is lower than standard light line strength, when adopting high frame per second monitoring mode, light filling is carried out to guarded region; When the ambient light intensity detected is equal to or higher than standard light line strength, when adopting high frame per second monitoring mode, to guarded region not light filling.
4. the method for supervising as described in claim 1 or 3, is characterized in that, the described light for light filling is infrared light or visible ray.
5. method for supervising as claimed in claim 1, is characterized in that, according to the ambient light intensity detected, and the monitor image signal intensity collected by change time for exposure, picture signal gain, aperture size adjustment.
6. method for supervising as claimed in claim 1, is characterized in that, carry out selectivity light filling according to the time to the guarded region under high frame per second monitoring mode.
7. method for supervising as claimed in claim 1, it is characterized in that, according to selection of time be adopt low frame per second monitoring mode guarded region is monitored, when discovery moving object enters guarded region, adopt high frame per second monitoring mode to monitor guarded region again, still adopt high frame per second monitoring mode to monitor guarded region.
8. method for supervising as claimed in claim 1, is characterized in that, utilizes background subtraction, frame differential method or optical flow method to detect the monitoring image obtained, has judged whether that moving object enters guarded region.
9. method for supervising as claimed in claim 8, is characterized in that, when moving object enters guarded region, give the alarm.
10. method for supervising as claimed in claim 8, is characterized in that, according to the monitor image signal of high frame per second monitoring mode, judge whether moving object is illegally enter.
11. method for supervising as claimed in claim 1, is characterized in that, the frame per second that described low frame per second monitoring mode adopts is less than 25fps.
12. method for supervising as claimed in claim 1, is characterized in that, the frame per second that described low frame per second monitoring mode adopts is less than or equal to 1fps.
13. method for supervising as claimed in claim 1, is characterized in that, the frame per second that described high frame per second monitoring mode adopts is more than or equal to 25fps.
14. 1 kinds of imageing sensor supervisory control systems, is characterized in that, comprising:
Image sensing cell, for obtaining the picture signal of guarded region, the Pixel Dimensions of described image sensing cell is equal to or greater than 12 μm × 12 μm;
Low frame per second monitoring unit, monitors under low frame per second monitoring mode for controlling image sensing cell;
High frame per second monitoring unit, monitors under high frame per second monitoring mode for controlling image sensing cell;
Motion detection unit, carries out motion detection to the picture signal obtained under low frame per second monitoring mode, and when detecting that moving object enters guarded region, motion detection unit outputs signal, and adopts high frame per second monitoring mode to monitor guarded region;
Light filling judging unit, judges whether to need to carry out light filling to guarded region for environmentally light intensity;
Light filling unit, the judged result according to light filling judging unit carries out selectivity light filling to guarded region;
Display unit, shows the monitor image signal of the low frame per second monitoring mode obtained or high frame per second monitoring mode;
Described light filling judging unit comprises light-metering unit, detects ambient light intensity at interval of a period of time, and ambient light intensity and standard light line strength is compared, and judging whether needs to carry out light filling to guarded region.
15. imageing sensor supervisory control systems as claimed in claim 14, it is characterized in that, described light filling judging unit comprises clock, by obtaining the current time, judges whether to carry out light filling to guarded region according to the described time.
16. imageing sensor supervisory control systems as described in claims 14 or 15 any one, it is characterized in that, the described light for light filling is infrared ray or visible ray.
17. imageing sensor supervisory control systems as claimed in claim 14, is characterized in that, the monitor image signal of acquisition by wire transmission mode or wireless transmission to display unit.
18. imageing sensor supervisory control systems as claimed in claim 14, is characterized in that, described image sensing cell is cmos image sensing unit or ccd image sensing unit.
19. imageing sensor supervisory control systems as claimed in claim 14, is characterized in that, the resolution of described image sensing cell is 240 × 320 or is less than 240 × 320.
20. imageing sensor supervisory control systems as claimed in claim 14, is characterized in that, the frame per second that described low frame per second monitoring unit control image sensing cell adopts under low frame per second monitoring mode is less than 25fps.
21. imageing sensor supervisory control systems as claimed in claim 14, is characterized in that, the frame per second that described low frame per second monitoring unit control image sensing cell adopts under low frame per second monitoring mode is less than or equal to 1fps.
22. imageing sensor supervisory control systems as claimed in claim 14, is characterized in that, the frame per second that described high frame per second monitoring unit control image sensing cell adopts under high frame per second monitoring mode is more than or equal to 25fps.
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