CN102695042A - Monitoring system and monitoring method for image sensors - Google Patents
Monitoring system and monitoring method for image sensors Download PDFInfo
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Abstract
The invention relates to a monitoring system and a monitoring method for image sensors. The monitoring method includes: monitoring a monitoring area by means of a low-frame-rate monitoring mode; and monitoring the monitoring area by means of a high-frame-rate monitoring mode when a moving object is discovered to enter the monitoring area, and selectively supplementing light for the monitoring area in the high-frame-rate monitoring mode. When the monitoring area is monitored by means of the low-frame-rate monitoring mode, exposure time for shooting each image can be prolonged, so that the signal intensity of the obtained monitoring image can be high, light supplementing is not needed even if in the dark environment, power consumption can be reduced, and high-quality images can be obtained and the monitoring area can be clearly seen. When the moving object is discovered to enter the monitoring area, the monitoring area is monitored from the high-frame-rate monitoring mode converted into the high-frame-rate monitoring mode, and selective light supplementing is performed, so that effective monitoring of the moving object in the monitoring area can be guaranteed, all-weather monitoring can be realized, and power consumption can be reduced.
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 all are equipped with the supervisory control system that imageing sensor, pyroelectric infrared sensor etc. are constituted; Utilize said supervisory control system that territory, limit area under one's jurisdiction is monitored; When finding to have the people to get into guarded region; Supervisory control system is sent warning, reminds the Security Personnel that the zone of correspondence is checked.
Said pyroelectric infrared sensor is the detecting element of being processed by the material of high Seebeck coefficient (like lithium tantalate); Utilize said pyroelectric infrared sensor that the infrared radiation that receives is transformed into faint voltage signal; Outwards output after amplifying; Thereby can detect people's in the certain limit action, and then give the alarm.Said pyroelectric infrared sensor is owing to the employing passive detection, so power consumption is very low, and device cost is very low.But said pyroelectric infrared sensor also has a lot of shortcomings; Poor anti jamming capability at first; When various thermals source (like toy) appear in the monitoring range of pyroelectric infrared sensor; The supervisory control system of utilizing said pyroelectric infrared sensor to process also can be reported by mistake, has brought very big inconvenience for Security Personnel's work, causes waste of manpower resource; And infrared being easy to that human body sends is blocked, thereby can't survey; When ambient temperature and human body temperature were similar, pyroelectric infrared sensor will be malfunctioning, can't give the alarm.
And adopt supervisory control system based on imageing sensor, because monitoring is higher with the imageing sensor cost, can't realize high-density installation.And traditional monitoring is normally monitored guarded region under high frame per second monitoring mode with imageing sensor; The frame per second of existing imageing sensor is generally 25fps or 30fps, because only more than or equal to 25fps, monitoring image information just links up; Help realizing real-time monitoring to guarded region; But the image sensor sensitivity under the high frame per second monitoring mode is lower, when light is dark, needs the very strong infrared light of a direct subsidy could realize effectively monitoring; But this can increase system cost, makes system power dissipation increase greatly simultaneously.
It is more that to please refer to application number about the supervising device with image sensing cell be 200810188857.5 Chinese patent document.
Summary of the invention
The problem that the present invention solves provides 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 addressing the above problem, technical scheme of the present invention provides a kind of method for supervising, comprising:
Adopt low frame per second monitoring mode that guarded region is monitored;
When finding have moving object to get into guarded region, adopt high frame per second monitoring mode that guarded region is monitored, and the guarded region under the high frame per second monitoring mode is carried out the selectivity light filling.
Optional, also comprise: ambient light intensity is detected.
Optional; Every certain interval of time detects ambient light intensity; If the ambient light intensity that obtains recently is lower than the standard light line strength; Then adopt low frame per second monitoring mode that guarded region is monitored, when finding that moving object gets into guarded region, adopts high frame per second monitoring mode that guarded region is monitored again; If the ambient light intensity that obtains recently is equal to or higher than the standard light line strength, then adopt high frame per second monitoring mode that guarded region is monitored.
Optional, every certain interval of time detects ambient light intensity, after the ambient light intensity of nearest acquisition is lower than the standard light line strength, finds to have moving object to get into guarded region, adopts high frame per second monitoring mode, and guarded region is carried out light filling; After the ambient light intensity of nearest acquisition is equal to or higher than the standard light line strength, finds to have moving object to get into guarded region, adopt high frame per second monitoring mode, to guarded region light filling not.
Optional, when finding to have after moving object gets into guarded region, ambient light intensity is detected, when detected ambient light intensity is lower than the standard light line strength, when adopting high frame per second monitoring mode, guarded region is carried out light filling; When detected ambient light intensity is equal to or higher than the standard light line strength, when adopting high frame per second monitoring mode, to guarded region light filling not.
Optional, the said light that is used for light filling is infrared light or visible light.
Optional, according to detected ambient light intensity, through changing the monitor image signal intensity that time for exposure, picture signal gain, aperture size adjustment collect.
Optional, the guarded region under the high frame per second monitoring mode is carried out the selectivity light filling according to the time.
Optional; According to selection of time is to adopt low frame per second monitoring mode that guarded region is monitored; When finding that moving object gets into guarded region, adopt high frame per second monitoring mode that guarded region is monitored again, still adopt high frame per second monitoring mode that guarded region is monitored.
Optional, utilize background subtraction point-score, frame-to-frame differences point-score or optical flow method that the monitoring image that obtains is detected, judged whether that moving object gets into guarded region.
Optional, when moving object gets into guarded region, give the alarm.
Optional, according to the monitor image signal of high frame per second monitoring mode, judge whether moving object is illegal entering.
Optional, the frame per second that said low frame per second monitoring mode adopts is less than 25fps.
Optional, the frame per second that said low frame per second monitoring mode adopts is smaller or equal to 1fps.
Optional, the frame per second that said high frame per second monitoring mode adopts is more than or equal to 25fps.
Technical scheme of the present invention also provides a kind of imageing sensor supervisory control system, comprising:
Image sensing cell is used to obtain the picture signal of guarded region;
Low frame per second monitoring unit is used to control image sensing cell and under low frame per second monitoring mode, monitors;
High frame per second monitoring unit is used to control image sensing cell and under high frame per second monitoring mode, monitors;
Motion detection unit is carried out motion detection to the picture signal that low frame per second monitoring mode obtains down, gets into guarded region when detecting moving object, and motion detection unit output signal adopts high frame per second monitoring mode that guarded region is monitored;
The light filling judging unit is used to judge whether and need carries out light filling to guarded region;
The light filling unit carries out light filling according to the judged result of light filling judging unit to guarded region;
Display unit shows the low frame per second monitoring mode that obtains or the monitor image signal of high frame per second monitoring mode.
Optional, said light filling judging unit comprises the photometry unit, through ambient light intensity is detected, and ambient light intensity and standard light line strength is compared, and judges whether and need carry out light filling to guarded region.
Optional, said light filling judging unit comprises clock, through obtaining the current time, judges whether guarded region is carried out light filling according to the said time.
Optional, the said light that is used for light filling is infrared ray or visible light.
Optional, the monitor image signal that obtains is transferred to display unit through wire transmission mode or wireless transmission method.
Optional, said image sensing cell is cmos image sensing unit or ccd image sensing unit.
Optional, the resolution of said image sensing cell is 240 * 320 or less than 240 * 320.
Optional, the Pixel Dimensions of said image sensing cell is equal to or greater than 12 μ m * 12 μ m.
Optional, the frame per second that said low frame per second monitoring unit control image sensing cell adopts under low frame per second monitoring mode is less than 25fps.
Optional, the frame per second that said low frame per second monitoring unit control image sensing cell adopts under low frame per second monitoring mode is smaller or equal to 1fps.
Optional, the frame per second that said 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 invention comprises: adopt low frame per second monitoring mode that guarded region is monitored; When finding have moving object to get into guarded region, adopt high frame per second monitoring mode that guarded region is monitored, and the guarded region under the high frame per second monitoring mode is carried out the selectivity light filling.Because when adopting low frame per second monitoring mode that guarded region is monitored; The time for exposure of every shooting one two field picture can be elongated; Make the monitor image signal intensity that obtains to become very big,, can reduce power consumption even in darker environment, also need not carry out light filling; And also can obtain high-quality monitoring image, also can see guarded region clearly; When finding that moving object gets into guarded region; Convert high frame per second monitoring mode again to guarded region is monitored, and carry out optionally light filling, thereby can guarantee the moving object of guarded region is effectively monitored; Round-the-clock monitoring can be realized, power consumption can be reduced again.
The imageing sensor supervisory control system of the embodiment of the 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; Because the frame per second that the low frame per second monitoring unit control image sensing cell of the embodiment of the invention adopts under low frame per second monitoring mode is less than 25fps; Even smaller or equal to 1fps; The time for exposure that can improve every shooting one two field picture can be elongated; The monitor image signal intensity that makes low frame per second monitoring mode obtain down can become very big, even in darker environment, also need not carry out light filling.Find that when utilizing motion detection unit moving object gets into guarded region; Converting high frame per second monitoring mode to through high frame per second monitoring unit again monitors guarded region; And carry out optionally light filling; Thereby can guarantee the moving object of guarded region is effectively monitored, can realize round-the-clock monitoring, can reduce power consumption again.
Description of drawings
Fig. 1 is the schematic flow sheet of the method for supervising of the embodiment of the invention;
Fig. 2 is the structural representation of the imageing sensor supervisory control system of the embodiment of the invention.
Embodiment
Because the monitoring mode of high frame per second is adopted in the monitoring of prior art usually with imageing sensor; But the image sensor sensitivity under the high frame per second monitoring mode is lower; When light is dark; Need the very strong infrared light of a direct subsidy could realize effectively monitoring, but this can increase system cost, makes system power dissipation increase greatly simultaneously.For this reason, the embodiment of the invention provides a kind of imageing sensor supervisory control system and method for supervising, and said method for supervising comprises: adopt low frame per second monitoring mode that guarded region is monitored; When finding have moving object to get into guarded region, adopt high frame per second monitoring mode that guarded region is monitored, and the guarded region under the high frame per second monitoring mode is carried out the selectivity light filling.Because when adopting low frame per second monitoring mode that guarded region is monitored; The time for exposure of every shooting piece image can be elongated; Make the monitor image signal intensity that obtains to become very big; Even in darker environment, need not carry out light filling yet, can reduce power consumption, also can see guarded region clearly; When finding that moving object gets into guarded region; Convert high frame per second monitoring mode again to guarded region is monitored, and carry out optionally light filling, thereby can guarantee the moving object of guarded region is effectively monitored; Round-the-clock monitoring can be realized, power consumption can be reduced again.
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.
The embodiment of the invention at first provides a kind of method for supervising, please refer to Fig. 1, and the schematic flow sheet for the method for supervising of the embodiment of the invention specifically comprises:
Step S101 adopts low frame per second monitoring mode that guarded region is monitored;
Step S102, whether have moving object get into guarded region, if there is moving object to get into guarded region, then forward step S103 to if detecting, when there not being moving object to get into guarded region, get back to step S101, continues monitoring;
Step S103 detects ambient light intensity, and ambient light intensity and standard light line strength are compared; If ambient light intensity is lower than the standard light line strength; Forward step S104 to,, then forward step S105 to if ambient light intensity is equal to or higher than the standard light line strength;
Step S104 carries out light filling to guarded region;
Step S105 adopts high frame per second monitoring mode that guarded region is monitored;
Step S106 according to the monitor image signal of high frame per second monitoring mode, judges whether moving object is illegal entering.
Concrete, execution in step S101 adopts low frame per second monitoring mode that guarded region is monitored.
The supervisory control system that the embodiment of the invention adopted is based on the supervisory control system of imageing sensor; Existing monitoring is adopted 25fps (frame/second) or higher fixedly frame per second usually with imageing sensor; Owing to only adopting 25fps (frame/second) or higher fixedly frame per second; The image that demonstrates just links up, and supervisory control system could be monitored guarded region effectively.But because imageing sensor is when adopting the fixedly frame per second of 25fps, the time for exposure of the image of each frame is no more than 0.04 second at most, the monitor image signal intensity that obtains on the imageing sensor a little less than.Especially when guarded region is dark, even maximum is transferred in aperture, the gain of supervisory control system camera lens, the monitor image signal intensity that obtains on the imageing sensor very a little less than, can not monitor effectively the guarded region of dark area.And if adopt infrared light filling, the very strong infrared light of needs one direct subsidy could realize effectively monitoring, but this can increase system cost, makes system power dissipation increase greatly simultaneously.Because supervisory control system all is in vacant state in most of time; Only, pedestrian, vehicle etc. just need carry out light filling when appearring in guarded region to guarded region; Guarded region is carefully monitored, and the power consumption of therefore in most of time, guarded region being carried out light filling is all wasted.
In embodiments of the present invention; Low frame per second monitoring mode is adopted in normal monitoring in the supervisory control system; The frame per second of image sensing cell is lower than the fixedly frame per second of the monitoring of prior art with imageing sensor; The frame per second that is said low frame per second monitoring mode hypograph transducer employing for example is 1fps, 5fps, 10fps etc. less than 25fps.In other embodiments, the frame per second that said low frame per second monitoring mode hypograph transducer adopts can also be less than 1fps, for example 0.5fps, 0.25fps etc.When the frame per second of said image sensing cell is hanged down; For example be 1fps; The time for exposure of the image of each frame can reach 1 second at most, is that the image exposuring time of 25fps improves 25 times than the frame per second of prior art, makes the monitor image signal intensity that obtains on the imageing sensor improve 25 times; Thereby help comparatively dark guarded region is effectively monitored; Help realizing round-the-clock monitoring, and need not carry out light filling when monitoring normally, can reduce the energy consumption of supervisory control system guarded region.
In the present embodiment; The image sensing cell of said supervisory control system all adopts low frame per second monitoring mode that guarded region is monitored in normal operational environment; Have only when finding that moving object gets into guarded region, just convert high frame per second monitoring mode to guarded region is monitored.When guarded region is very bright; Can adopt AEC (automatic exposure control), AGC (automatic gain control), AIC methods such as (auto iris controls); Promptly reduce the image intensity signal that image sensing cell obtains through the size that reduces time for exposure, picture signal gain, dwindles the aperture of camera lens; The image intensity signal that makes imageing sensor obtain remains on a particular value, makes when guarded region is very bright, still can adopt low frame per second monitoring mode that guarded region is monitored.When guarded region is very dark, also can adopt AEC (automatic exposure control), AGC (automatic gain control), AIC methods such as (auto iris controls) moderately improves the image intensity signal that imageing sensor obtains.
In other embodiments; Can also ambient light intensity be detected every certain interval of time, for example whenever ambient light intensity is carried out one-time detection, and the ambient light intensity that will obtain recently and standard light line strength compare at a distance from 10 minutes or 30 minutes; If ambient light intensity is lower than the standard light line strength; Then adopt low frame per second monitoring mode that guarded region is monitored, when finding that moving object gets into guarded region, adopts high frame per second monitoring mode that guarded region is monitored again; If the ambient light intensity that obtains recently is equal to or higher than the standard light line strength, then adopt high frame per second monitoring mode that guarded region is monitored.Said standard light line strength is the light intensity of a setting, is the corresponding light intensity of the required minimum image signal intensity of supervisory control system display monitoring image.In the present embodiment, said standard light line strength is 10lux.
In other embodiments, can also adjust the monitoring mode of imageing sensor according to the time.For example, when time when being the morning 6 up to afternoon 6, the imageing sensor of supervisory control system adopts high frame per second monitoring mode that guarded region is monitored; When time when being afternoon 6 up to morning 6, the imageing sensor of supervisory control system adopts low frame per second monitoring mode that guarded region is monitored, when finding that moving object gets into guarded region, adopts high frame per second monitoring mode that guarded region is monitored again.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 adopting the monitoring mode of low frame per second or high frame per second respectively.
Execution in step S102, whether have moving object get into guarded region, if there is moving object to get into guarded region, then forward step S103 to if detecting, when there not being moving object to get into guarded region, get back to step S101, continues monitoring.
The method of the monitoring image under the low frame per second monitoring mode being carried out the detection of moving object comprises background subtraction point-score (background subtraction), frame-to-frame differences point-score (temporal differencing), optical flow method (optical flow) etc.
In embodiments of the present invention; The method of the monitoring image under the low frame per second monitoring mode being carried out the detection of moving object is the background subtraction point-score; Specifically comprise: a background image is provided, and said background image is the image that does not comprise the guarded region of moving objects such as people, automobile; The monitoring image and the background image that photograph under the low frame per second monitoring mode are carried out calculus of differences in real time, preserve the absolute value of difference result with a new difference image; In said difference image; When the value of pixel smaller or equal to a particular value; Think that then the pixel of same position belongs to the background area in the monitoring image, when the value of pixel greater than a particular value, think that then the pixel of same position belongs to the moving object zone in the monitoring image.Pixel in finding monitoring image belongs to the moving object zone, and then thinking has moving object to get into guarded region.In embodiments of the present invention, said moving object comprises all moving objects such as people, automobile, animal.Get into guarded region as moving object; For the effectively action of monitor motion object; The everything that needs the monitoring moving object, therefore, imageing sensor need be adjusted into and adopt high frame per second monitoring mode; And guarded region is carried out optionally light filling, make and also can carry out effective monitoring at night guarded region.
In other embodiments; When the method for the guarded region under the low frame per second monitoring mode being carried out the detection of moving object is the frame-to-frame differences point-score; Specifically comprise: two adjacent in the monitoring image sequence width of cloth or three width of cloth images are carried out calculus of differences; Judged whether that moving object gets into guarded region, and utilized the frame-to-frame differences point-score can also detect the profile information of moving object, utilized said profile information can judge whether that the someone gets into guarded region; Have only the people to get into guarded region and just remind the Security Personnel; Supervisory control system also gives the alarm and reminds the Security Personnel when avoiding entering guarded region such as bird, kitten, can reduce Security Personnel's workload, makes supervisory control system intelligent more.In the present embodiment, said moving object can be all moving objects such as people, automobile, animal, can be the people only also.Get into guarded region as moving object; For the effectively action of monitor motion object; The everything that needs the monitoring moving object; Imageing sensor need be adjusted into and adopt high frame per second monitoring mode, and guarded region is carried out optionally light filling, makes and also can carry out effective monitoring to guarded region at night.
Execution in step S103 detects ambient light intensity, and ambient light intensity and standard light line strength are compared; If ambient light intensity is lower than the standard light line strength; Forward step S104 to,, then forward step S105 to if ambient light intensity is equal to or higher than the standard light line strength.
In embodiments of the present invention, after moving object gets into guarded region, ambient light intensity is detected, and detected ambient light intensity and standard light line strength are compared.If ambient light intensity is lower than the standard light line strength, then guarded region is carried out light filling, if ambient light intensity is equal to or higher than the standard light line strength, then need not carry out light filling to guarded region.Said standard light line strength is the light intensity of a setting, is the corresponding light intensity of the required minimum image signal intensity of supervisory control system display monitoring image.In the present embodiment, said standard light line strength is 10lux.
In other embodiments; Every certain interval of time detects ambient light intensity; For example whenever ambient light intensity is carried out one-time detection at a distance from 10 minutes or 30 minutes; After having monitored moving object entering guarded region, can directly utilize the ambient light intensity and the standard light line strength that will record recently to compare.If the ambient light intensity that records recently is lower than the standard light line strength, then guarded region is carried out light filling, if the ambient light intensity that records recently is equal to or higher than the standard light line strength, then need not monitor guarded region.The embodiment of the invention has monitored moving object to operating in of detecting of ambient light intensity and has accomplished before getting into guarded region; After having monitored moving object entering guarded region; Can directly utilize the ambient light intensity and the standard light line strength that record recently to compare; And can judge whether need light filling apace, and improved the reaction time of light filling, help guarded region is monitored.
In other embodiments, can also judge whether that needs carry out light filling to guarded region according to the time.For example,, monitored after moving object gets into guarded region, guarded region has not been carried out light filling when time when being the morning 6 up to afternoon 6; When time when being afternoon 6 up to morning 6, monitored after moving object gets into guarded region, guarded region is carried out light filling.
Owing to only, just need carry out light filling to guarded region at dark and monitored after moving object gets into guarded region, do not need light filling at other times, can reduce the energy consumption of supervisory control system greatly.
Execution in step S104 carries out light filling to guarded region.
The said light that is used for light filling is infrared light or visible light.In the present embodiment, the said light intensity that is used for light filling is fixed, and in other embodiments, the said light intensity that is used for light filling is transformable, can adjust the light intensity of light filling according to ambient light intensity.When ambient light intensity is more weak; The light intensity that can appropriateness improves light filling when ambient light intensity dies down relatively, can appropriateness reduces the light intensity of light filling; Can clearly monitor the guarded region under the dark state, can save the power consumption of light filling again.In the present embodiment, the said light that is used for light filling sends through the infrared LEDs lamp.
Execution in step S105 adopts high frame per second monitoring mode that guarded region is monitored.
Get into guarded region when having detected moving object, for the effectively action of monitor motion object, need the everything of monitoring moving object, imageing sensor need be adjusted into and adopt high frame per second monitoring mode.In the present embodiment, the frame per second that said high frame per second monitoring mode hypograph transducer adopts is 25fps, and in other embodiments, the frame per second that said high frame per second monitoring mode hypograph transducer adopts is greater than 25fps, for example 30fps, 50fps etc.
In the present embodiment; After having detected moving object entering guarded region; Judge and to carry out light filling to guarded region, when guarded region is carried out light filling, imageing sensor is adjusted into high frame per second monitoring mode; Adopt high frame per second monitoring mode that guarded region is monitored, make display unit from low frame per second monitoring mode is transformed into the process of high frame per second monitoring mode, still can effectively monitor guarded region.
In other embodiments, said guarded region is carried out light filling and imageing sensor is adjusted into high frame per second monitoring mode also can not carrying out simultaneously.
In other embodiments; In order to remind the Security Personnel to notice that guarded region has moving object, get into guarded region when having detected moving object, supervisory control system gives the alarm; Make the Security Personnel can notice that moving object appears in guarded region, to guarantee that the Security Personnel can react rapidly.
Execution in step S106 according to the monitor image signal of high frame per second monitoring mode, judges whether moving object is illegal entering.
The Security Personnel checks according to the monitor image signal of high frame per second monitoring mode, or the guarded region of sending someone carries out the scene inquiry.When find moving object for illegal get into or moving object driven away or control after, it is to hang down the frame per second monitoring mode that the imageing sensor of supervisory control system is readjusted.
Supervisory control system has been carried out light filling to guarded region under high frame per second monitoring mode, and the imageing sensor of supervisory control system is readjusted to behind the low frame per second monitoring mode, stops light filling.
In other embodiments, when find moving object for illegal get into or moving object driven away or control after, sound all clear.
The embodiment of the invention also provides a kind of imageing sensor supervisory control system, please refer to Fig. 2, and the structural representation for the imageing sensor supervisory control system of the embodiment of the invention comprises: image sensing cell 210 is used to obtain the picture signal of guarded region; Low frame per second monitoring unit 220 is used to control image sensing cell and under low frame per second monitoring mode, monitors; Motion detection unit 230 is carried out motion detection to the picture signal that low frame per second monitoring mode obtains down, gets into guarded region when detecting moving object, and motion detection unit output signal adopts high frame per second monitoring mode that guarded region is monitored; Light filling judging unit 240 is used to judge whether and need carries out light filling to guarded region; Light filling unit 250 carries out light filling according to the judged result of light filling judging unit to guarded region; High frame per second monitoring unit 260 is used to control image sensing cell and under high frame per second monitoring mode, monitors; Display unit 270 shows the low frame per second monitoring mode that obtains or the monitor image signal of high frame per second monitoring mode.
Concrete, said image sensing cell 210 can be cmos image sensing unit or ccd image sensing unit.In the present embodiment; Said image sensing cell 210 is the cmos image sensing unit; The resolution of said cmos image sensing unit is 240 * 320 or less than 240 * 320, concrete, said cmos image sensing unit can adopt QVGA (Quarter Video Graphics Array; 240 * 320), QCIF (Quarter common intermediate format; 176 * 144), QQVGA pattern matrixs such as (Quarter Quarter Video Graphics Array, 160 * 120).Because resolution is 240 * 320 or lower less than the imageing sensor cost of 240 * 320 pattern matrix; Help realizing high-density mounting; And it is less to requirements for transmission to obtain picture signal; The monitor image signal that obtains can be transferred to display unit 270 through wire transmission mode or wireless transmission method, thereby can make supervisory control system more flexible so that supervisory control system can both be installed in meaning in office place.Said wire transmission mode comprises twisted-pair feeder, coaxial cable, optical fiber etc., and said wireless transmission method comprises communication modes such as infrared communication, bluetooth, WLAN, Wifi.In other embodiments, the resolution of said cmos image sensing unit can also be greater than 240 * 320.
In the prior art; Monitoring is generally 6 μ m * 6 μ m with the Pixel Dimensions of imageing sensor; In embodiments of the present invention; The Pixel Dimensions of said cmos image sensing unit is 12 μ m * 12 μ m, and in other embodiments, the Pixel Dimensions of said cmos image sensing unit can also be greater than 12 μ m * 12 μ m.Because Pixel Dimensions is big more, the obtainable light intensity of each pixel is big more, and the sensitivity of imageing sensor is high more, helps in darker environment, also obtaining high-quality image.
Said image sensing cell 210 also comprises camera lens (not shown); Utilize said camera lens that the IMAQ of guarded region is formed monitor image signal in image sensing cell 210, and be transferred to display unit 270 through wire transmission mode or wireless transmission method and show.Said camera lens can also be connected with automatic exposure control module (not shown), auto iris control module modules such as (not shown); Make said automatic exposure control module, auto iris control module adjust, make imageing sensor can obtain high-quality monitoring image time for exposure, the aperture size of optical lens.
In other embodiments; Also be connected automatic gain control module (not shown) between said image sensing cell and the display unit; The monitor image signal that utilizes said automatic gain control module that image sensing cell is obtained carries out gain expansion or dwindles, and makes display unit can show high-quality monitoring image.
Said low frame per second monitoring unit 220 links to each other with image sensing cell 210, can utilize the frame per second of low frame per second monitoring unit 220 adjustment image sensing cells 210, makes image sensing cell 210 under low frame per second monitoring mode, to work, and obtains monitoring image.The frame per second that said low frame per second monitoring unit 220 control image sensing cells 210 adopt under low frame per second monitoring mode for example is 1fps, 5fps, 10fps etc. less than 25fps.In other embodiments, said low frame per second monitoring unit can also be controlled the frame per second of image sensing cell employing under low frame per second monitoring mode less than 1fps, for example 0.5fps, 0.25fps etc.Because when the frame per second of image sensing cell is low, for example be 1fps, the time for exposure of the image of each frame can reach 1 second at most; Than the frame per second of prior art is that the image exposuring time of 25fps improves 25 times; Make the monitor image signal intensity that obtains on the image sensing cell improve 25 times, thereby help comparatively dark guarded region is effectively monitored, realize round-the-clock monitoring; And need not carry out light filling, can reduce the energy consumption of supervisory control system guarded region.
When guarded region is very bright; Can reduce the image intensity signal that imageing sensor obtains through the size that reduces time for exposure, picture signal gain, dwindles the aperture of camera lens; The image intensity signal that makes imageing sensor obtain remains on a particular value; Make when guarded region is very bright, still can adopt low frame per second monitoring mode that guarded region is monitored.
Said motion detection unit 230 links to each other with low frame per second monitoring unit 220, and the picture signal that 230 pairs of low frame per second monitoring modes of said motion detection unit obtain is down carried out motion detection.
The method of the motion detection that said motion detection unit 230 adopted comprises background subtraction point-score (background subtraction), frame-to-frame differences point-score (temporal differencing), optical flow method (optical flow) etc.In embodiments of the present invention; The method of the guarded region under the low frame per second monitoring mode being carried out the detection of moving object is the background subtraction point-score; The monitoring image and the background image that photograph under the low frame per second monitoring mode are compared in real time, judged whether that moving object gets into guarded region.
In other embodiments; When the method for the guarded region under the low frame per second monitoring mode being carried out the detection of moving object also can be the inter-frame difference method; Two adjacent in the monitoring image sequence width of cloth or three width of cloth images are carried out calculus of differences; The difference of two field picture before and after judging gets into guarded region to have judged whether moving object.
Find to have moving object when said motion detection unit 230 and get into guarded region, control signal is sent to light filling judging unit 240, to judge whether and to carry out light filling to guarded region.Do not find to have moving object to get into guarded region when said motion detection unit 230, continue the picture signal that low frame per second monitoring unit 220 obtains is carried out motion detection.
In other embodiments; Find to have moving object when said motion detection unit and get into the condition that guarded region whether need to have obtained before light filling; For example having judged not according to current time or ambient light intensity, needs carry out light filling; Then motion detection unit sends control signal directly for high frame per second monitoring unit, and high frame per second monitoring unit control image sensing cell is monitored guarded region under high frame per second monitoring mode.When said motion detection unit find to have moving object get into guarded region before according to current time or ambient light intensity needs carry out light filling; Then motion detection unit sends control signal for light filling unit and high frame per second monitoring unit; The 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; Said motion detection unit directly links to each other with image sensing cell; When motion detection unit finds to have moving object to get into guarded region according to obtain 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 under high frame per second monitoring mode, monitor guarded region.
Said light filling judging unit 240 judges whether that according to time or ambient light intensity needs carry out light filling to guarded region.In the present embodiment; Said light filling judging unit 240 comprises the photometry unit, and said photometry unit is an optical sensor, through ambient light intensity is detected; And ambient light intensity and standard light line strength compared, judge whether and need carry out light filling guarded region.If ambient light intensity is lower than the standard light line strength, then need carry out light filling to guarded region, send control signal to light filling unit 250, make the light filling unit carry out light filling; If ambient light intensity is equal to or higher than the standard light line strength, then need not carry out light filling to guarded region, do not send control signal to light filling unit 250.
In other embodiments, said light filling judging unit 240 comprises clock, through obtaining the current time, can judge whether that needs carry out light filling to guarded region according to the time.For example,, monitored after moving object gets into guarded region, guarded region has not been carried out light filling, do not sent control signal to the light filling unit when time when being the morning 6 up to afternoon 6; When time when being afternoon 6 up to morning 6, monitored after moving object gets into guarded region, guarded region is carried out light filling, send control signal to the light filling unit.
Said light filling unit 250 links to each other with light filling judging unit 240, can produce bulb, fluorescent tube, the LED lamp of infrared ray or visible light, and in embodiments of the present invention, said light filling unit 250 is the infrared LEDs lamp.Because infrared ray can not be discerned by human eye; Utilizing infrared ray to carry out light filling can the disturbed motion object; If there is the people illegally to get into; Can when not alarming illegal incomer, monitor illegal incomer, and through sending the Security Personnel to go on-the-spot expulsion or controlling illegal incomer to reach the purpose of antitheft.
In other embodiments, the light intensity that said light filling unit is used for light filling is transformable, can adjust the light intensity of light filling according to ambient light intensity.When ambient light intensity is more weak, can improve the light intensity of light filling, when ambient light intensity is more weak, can reduce the light intensity of light filling, can clearly monitor the guarded region under the dark state, can save the power consumption of light filling again.
Said high frame per second monitoring unit 260 links to each other with light filling judging unit 240, light filling unit 250 with image sensing cell 210; Judge guarded region when light filling judging unit 240 and need not 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 control image sensing cells 210 under high frame per second monitoring mode, to work, obtain monitoring image; Judge guarded region when light filling judging unit 240 and need 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 control image sensing cells 210 under high frame per second monitoring mode, to work, obtain monitoring image.In other embodiments; When going out guarded region, the light filling judgment unit judges need carry out light filling; The light filling unit carries out light filling to guarded region; And the light filling judging unit sends control signal to high frame per second monitoring unit, utilizes high frame per second monitoring unit control image sensing cell under high frame per second monitoring mode, to work, and obtains monitoring image.
In the embodiment of the invention, the frame per second that said high frame per second monitoring unit 260 control chart image-position sensors adopt under high frame per second monitoring mode for example is 25fps, 30fps, 50fps etc. more than or equal to 25fps.
Said display unit 270 links to each other with high frame per second monitoring unit 260, low frame per second monitoring unit 220; The low frame per second monitoring mode that obtains or the monitor image signal of high frame per second monitoring mode are shown said high frame per second monitoring unit 260, low frame per second monitoring unit 220 are transferred to display unit 270 through wire transmission mode or wireless transmission method with monitor image signal.In the present embodiment, the monitor image signal of said low frame per second monitoring mode and high frame per second monitoring mode all shows on display unit 270.In other embodiments, have only and find to have moving object to get into guarded region, the monitor image signal that just high frame per second monitoring unit is obtained shows on display unit.
In other embodiments, said display unit directly links to each other with image sensing cell, and the picture signal that the control through high frame per second monitoring unit or low frame per second monitoring unit obtains image sensing cell sends display unit to and shows.
In other embodiments; Said imageing sensor supervisory control system 20 also comprises alarm unit (not shown); Said alarm unit links to each other with motion detection unit 230; Find to have moving object when motion detection unit 230 and get into guarded region, alarm unit gives the alarm, and reacts rapidly to remind the Security Personnel.
To sum up, the method for supervising of the embodiment of the invention comprises: adopt low frame per second monitoring mode that guarded region is monitored; When finding have moving object to get into guarded region, adopt high frame per second monitoring mode that guarded region is monitored, and the guarded region under the high frame per second monitoring mode is carried out the selectivity light filling.Because when adopting low frame per second monitoring mode that guarded region is monitored; The time for exposure of every shooting one two field picture can be elongated; Make the monitor image signal intensity that obtains to become very big,, can reduce power consumption even in darker environment, also need not carry out light filling; And also can obtain high-quality monitoring image, also can see guarded region clearly; When finding that moving object gets into guarded region; Convert high frame per second monitoring mode again to guarded region is monitored, and carry out optionally light filling, thereby can guarantee the moving object of guarded region is effectively monitored; Round-the-clock monitoring can be realized, power consumption can be reduced again.
The imageing sensor supervisory control system of the embodiment of the 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; Because the frame per second that the low frame per second monitoring unit control image sensing cell of the embodiment of the invention adopts under low frame per second monitoring mode is less than 25fps; Even smaller or equal to 1fps; The time for exposure that can improve every shooting one two field picture can be elongated; The monitor image signal intensity that makes low frame per second monitoring mode obtain down can become very big, even in darker environment, also need not carry out light filling.Find that when utilizing motion detection unit moving object gets into guarded region; Converting high frame per second monitoring mode to through high frame per second monitoring unit again monitors guarded region; And carry out optionally light filling; Thereby can guarantee the moving object of guarded region is effectively monitored, can realize round-the-clock monitoring, can reduce power consumption again.
Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting the present invention; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can utilize the method and the technology contents of above-mentioned announcement that technical scheme of the present invention is made possible change and modification, therefore, every content that does not break away from technical scheme of the present invention; To any simple modification, equivalent variations and modification that above embodiment did, all belong to the protection range of technical scheme of the present invention according to technical spirit of the present invention.
Claims (26)
1. a method for supervising is characterized in that, comprising:
Adopt low frame per second monitoring mode that guarded region is monitored;
When finding have moving object to get into guarded region, adopt high frame per second monitoring mode that guarded region is monitored, and the guarded region under the high frame per second monitoring mode is carried out the selectivity light filling.
2. method for supervising as claimed in claim 1 is characterized in that, also comprises: ambient light intensity is detected.
3. method for supervising as claimed in claim 2; It is characterized in that; Every certain interval of time detects ambient light intensity, if the ambient light intensity that obtains recently is lower than the standard light line strength, then adopts low frame per second monitoring mode that guarded region is monitored; When finding that moving object gets into guarded region, adopts high frame per second monitoring mode that guarded region is monitored again; If the ambient light intensity that obtains recently is equal to or higher than the standard light line strength, then adopt high frame per second monitoring mode that guarded region is monitored.
4. method for supervising as claimed in claim 2; It is characterized in that; Every certain interval of time detects ambient light intensity, after the ambient light intensity of nearest acquisition is lower than the standard light line strength, finds to have moving object to get into guarded region; Adopt high frame per second monitoring mode, and guarded region is carried out light filling; After the ambient light intensity of nearest acquisition is equal to or higher than the standard light line strength, finds to have moving object to get into guarded region, adopt high frame per second monitoring mode, to guarded region light filling not.
5. method for supervising as claimed in claim 2 is characterized in that, after finding that moving object entering guarded region is arranged; Ambient light intensity is detected; When detected ambient light intensity is lower than the standard light line strength, when adopting high frame per second monitoring mode, guarded region is carried out light filling; When detected ambient light intensity is equal to or higher than the standard light line strength, when adopting high frame per second monitoring mode, to guarded region light filling not.
6. like claim 4 or 5 described method for supervising, it is characterized in that the said light that is used for light filling is infrared light or visible light.
7. method for supervising as claimed in claim 2 is characterized in that, according to detected ambient light intensity, through changing the monitor image signal intensity that time for exposure, picture signal gain, aperture size adjustment collect.
8. method for supervising as claimed in claim 1 is characterized in that, the guarded region under the high frame per second monitoring mode is carried out the selectivity light filling according to the time.
9. method for supervising as claimed in claim 1; It is characterized in that; According to selection of time is to adopt low frame per second monitoring mode that guarded region is monitored; When finding that moving object gets into guarded region, adopt high frame per second monitoring mode that guarded region is monitored again, still adopt high frame per second monitoring mode that guarded region is monitored.
10. method for supervising as claimed in claim 1 is characterized in that, utilizes background subtraction point-score, frame-to-frame differences point-score or optical flow method that the monitoring image that obtains is detected, and has judged whether that moving object gets into guarded region.
11. method for supervising as claimed in claim 10 is characterized in that, when moving object gets into guarded region, gives the alarm.
12. method for supervising as claimed in claim 10 is characterized in that, according to the monitor image signal of high frame per second monitoring mode, judges whether moving object is illegal entering.
13. method for supervising as claimed in claim 1 is characterized in that, the frame per second that said low frame per second monitoring mode adopts is less than 25fps.
14. method for supervising as claimed in claim 1 is characterized in that, the frame per second that said low frame per second monitoring mode adopts is smaller or equal to 1fps.
15. method for supervising as claimed in claim 1 is characterized in that, the frame per second that said high frame per second monitoring mode adopts is more than or equal to 25fps.
16. an imageing sensor supervisory control system is characterized in that, comprising:
Image sensing cell is used to obtain the picture signal of guarded region;
Low frame per second monitoring unit is used to control image sensing cell and under low frame per second monitoring mode, monitors;
High frame per second monitoring unit is used to control image sensing cell and under high frame per second monitoring mode, monitors;
Motion detection unit is carried out motion detection to the picture signal that low frame per second monitoring mode obtains down, gets into guarded region when detecting moving object, and motion detection unit output signal adopts high frame per second monitoring mode that guarded region is monitored;
The light filling judging unit is used to judge whether and need carries out light filling to guarded region;
The light filling unit carries out light filling according to the judged result of light filling judging unit to guarded region;
Display unit shows the low frame per second monitoring mode that obtains or the monitor image signal of high frame per second monitoring mode.
17. imageing sensor supervisory control system as claimed in claim 16; It is characterized in that said light filling judging unit comprises the photometry unit, through ambient light intensity is detected; And ambient light intensity and standard light line strength compared, judge whether and need carry out light filling guarded region.
18. imageing sensor supervisory control system as claimed in claim 16 is characterized in that, said light filling judging unit comprises clock, through obtaining the current time, judges whether guarded region is carried out light filling according to the said time.
19., it is characterized in that the said light that is used for light filling is infrared ray or visible light like any described imageing sensor supervisory control system of claim 17 to 18.
20. imageing sensor supervisory control system as claimed in claim 16 is characterized in that the monitor image signal that obtains is transferred to display unit through wire transmission mode or wireless transmission method.
21. imageing sensor supervisory control system as claimed in claim 16 is characterized in that, said image sensing cell is cmos image sensing unit or ccd image sensing unit.
22. imageing sensor supervisory control system as claimed in claim 16 is characterized in that, the resolution of said image sensing cell is 240 * 320 or less than 240 * 320.
23. imageing sensor supervisory control system as claimed in claim 16 is characterized in that, the Pixel Dimensions of said image sensing cell is equal to or greater than 12 μ m * 12 μ m.
24. imageing sensor supervisory control system as claimed in claim 16 is characterized in that, the frame per second that said low frame per second monitoring unit control image sensing cell adopts under low frame per second monitoring mode is less than 25fps.
25. imageing sensor supervisory control system as claimed in claim 16 is characterized in that, the frame per second that said low frame per second monitoring unit control image sensing cell adopts under low frame per second monitoring mode is smaller or equal to 1fps.
26. imageing sensor supervisory control system as claimed in claim 16 is characterized in that, the frame per second that said 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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| CN108718393A (en) * | 2018-08-03 | 2018-10-30 | 上海晔芯电子科技有限公司 | A kind of cmos image sensor and its monitoring method |
| CN108718393B (en) * | 2018-08-03 | 2024-04-05 | 思特威(上海)电子科技股份有限公司 | CMOS image sensor and monitoring method thereof |
| CN110708507A (en) * | 2019-09-23 | 2020-01-17 | 深圳市景阳信息技术有限公司 | Monitoring video data transmission method and device and terminal equipment |
| CN111668359A (en) * | 2020-07-06 | 2020-09-15 | 广东澳多科技有限公司 | LED light source packaging structure and outdoor monitoring camera |
| CN112333382A (en) * | 2020-10-14 | 2021-02-05 | 维沃移动通信（杭州）有限公司 | Shooting method and device and electronic equipment |
| WO2022222170A1 (en) * | 2021-04-20 | 2022-10-27 | 豪威芯仑传感器(上海)有限公司 | Image sensor and image processing system |
| CN114040121A (en) * | 2021-10-29 | 2022-02-11 | 浙江大华技术股份有限公司 | Monitoring method, monitoring device and computer readable storage medium |
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