CN107241546A - Lamp array scintillation system, video camera time detecting initialization system and method - Google Patents
Lamp array scintillation system, video camera time detecting initialization system and method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/90—Arrangement of cameras or camera modules, e.g. multiple cameras in TV studios or sports stadiums
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
- H04N5/067—Arrangements or circuits at the transmitter end
- H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations
- H04N5/0733—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations for distributing synchronisation pulses to different TV cameras
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
For video camera time detecting and/or the lamp array scintillation system of setting, including：Lamp array, can be operated according to predetermined dot matrix status switch, with predetermined cycle period so that each lamp carries out light on and off；The light on and off of each lamp in lamp array light on and off controller, control lamp array.Further, the lamp in lamp array is LED, wherein whole LEDs are divided into N groups；Every group of LED enters line flicker in the way of horse race lamp；There is hierarchical relationship between group, the only group of inferior grade completes a flicker cycle, and adjacent thereto high-grade group could enter next flicker state, and so on circulate.Video camera recognizes that flicker state shoots timing to detect by shooting lamp array, and adjustable shooting timing.The video camera time detecting setting technique of the present invention is easy to deployment, and easy to implement, cost is low；Higher time control precision can be reached, its time control accuracy is limited solely by video camera minimum exposure time；Control to shooting time is the direct time for adjusting shooting picture, and precision is high.
Description
Technical field
The present invention relates generally to computer vision technique, more particularly to lamp array scintillation system, video camera time detecting
Initialization system and method.
Background technology
The typical frame per second that in general video camera is shot at present is time difference between 30 frames/second, that is, two frames 30
Millisecond or so, when multiple cameras is shot, does not in general have strict time unifying relation, often between video camera
The correct time of individual that frame of shot by camera actually exists difference.Such as First video camera shoots the first frame
Time is the 0th millisecond, and the second frame is the 33rd millisecond, and the time that second video camera shoots the first frame is probably the 11st millisecond,
Second frame is the 44th millisecond, and the time that the 3rd video camera shoots the first frame is probably the 7th millisecond, and the second frame is the 40th millisecond.
Such three video cameras are when shooting same scene, and the captured time has differences.
Need there is stricter temporal relation between multiple cameras under some specific application scenarios, than
Such as：
1) multiple pictures that multiple monitoring probes wish captured align in time, preferably to carry out video analysis
And processing.
2) picture that multiple video cameras are shot needs splicing, such as streetscape shoots dolly, is above synchronously clapped if not the time
If taking the photograph, picture splicing effect may be caused poor.
3) shoot similar with a string of video cameras《En Ter The Matrix》In the main body that is taken it is static suddenly, and shooting angle rotates
180 degree or at 360 degree, it is necessary to multiple video cameras are shot simultaneously, can just obtain good special effects.
4) the video camera use demand of some other professional domain.
In order to realize the control to multiple video camera shooting times, traditionally come generally by the mode of hardware control
Realize, that is, have a central time controller, by sending trigger signal to each video camera, triggering video camera is suitable
Opportunity is shot, but this way has following three problem：
1) hardware system constitutes relatively complicated, it is necessary to connect line trigger signal, and has trigger controller real
Now control, and video camera will possess the function of being shot by external trigger.
2) it is triggered from video camera, scenery is actually photographed to video camera, there will necessarily be a delay among these.If
Hardware can ensure that the size of this delay is fixed, can reach that expected shooting time control is required, but if hardware
It cannot be guaranteed that delay size immobilizes, than if desired for operating system scheduling by internal firmware etc., the then control of shooting time
System still can not reach preferable target.
3) user of multi-camera system controls whether to have reached the set goal for the shooting time of multiple cameras,
Neither one detection means, it is impossible to firmly believe whether reached expected time control target.
The content of the invention
In view of the foregoing, it is proposed that the present invention.
According to an aspect of the invention, there is provided a kind of flash for video camera time detecting and/or the lamp array of setting
System, including：Lamp array, can be operated according to predetermined dot matrix status switch, with predetermined cycle period so that each lamp is carried out
Light on and off, lamp array minimum flicker duration can determine；Lamp array light on and off controller, for according to the predetermined dot matrix status switch,
The predetermined cycle period, the minimum flashes duration to control the light on and off of each lamp in lamp array.
According to a further embodiment of the invention, the lamp in the lamp array is LED, wherein whole LEDs are divided into N groups,
The number of every group of LED is more than or equal to 3；Every group of LED enters line flicker in the way of horse race lamp；There is hierarchical relationship between group, only
The group for having inferior grade completes a flicker cycle, and adjacent thereto high-grade group could enter next flicker state, so past
Multiple circulation.
There is provided a kind of video camera that time detecting and/or setting are carried out to video camera according to another aspect of the present invention
Time detecting initialization system, including lamp array, multiple video cameras and processor, lamp array are arranged by predetermined pattern by multiple lamps and formed,
It can operate according to predetermined dot matrix status switch, with predetermined cycle period so that each lamp carries out light on and off, lamp array minimum is dodged
Bright duration can determine；Multiple video cameras, can be clapped with fixing frame per second or adjustable frame per second shooting image, and receiving the target of setting
Take the photograph timing；Processor, can receive the image of video camera shooting, and recognize the pattern of the flicker of the lamp array in image, thus judge
The time that picture is taken, so that it is determined that video camera shoots the skew between timing and the target shooting timing of setting, Yi Jiji
Regulate and control the shooting timing of video camera in the skew.
When shooting the video camera that timing is detected and/or set there is provided a kind of video camera in accordance with a further aspect of the present invention
Between detect establishing method, known to video camera current frame rate；So that lamp array is according to predetermined dot matrix status switch, with predetermined circulation
Cycle enters line flicker, and lamp array minimum flicker duration can determine；Video camera shoots the image of lamp array；The image is recognized by processor
Thus the pattern of middle lamp array flicker, judge the time that picture is taken, so that it is determined that video camera according to the flicker state identified
The skew between timing and the target shooting timing of setting is shot, and is determined based on the shooting offset to regulate and control video camera
When.
There is provided a kind of video camera that time detecting and/or setting are carried out to video camera according to another aspect of the present invention
Time detecting initialization system, including lamp array change in pattern part, multiple video cameras and processor, lamp array change in pattern part, by
Multiple entities or virtual lamp arrange to be formed by predetermined pattern, can operate according to predetermined dot matrix status switch, with predetermined
Cycle period causes each lamp to carry out light on and off, and lamp array minimum flicker duration can determine；Multiple video cameras, can with fix frame per second or
Adjustable frame per second shooting image, and receive the target shooting timing of setting；Processor, can receive the image of video camera shooting, and
Recognize the pattern of the lamp array flicker in image, thus judge time for being taken of picture, so that it is determined that video camera shoot timing with
The target of setting shoots the skew between timing, and based on the shooting timing offset to regulate and control video camera.
According to embodiments of the present invention, one or more in following technique effect can be obtained：
1) it is easy to deployment, easy to implement, cost is low, it is adaptable to most general network cameras.
2) higher time control precision can be reached, when its time control accuracy is limited solely by video camera most short exposure
Between.
3) be to the control of shooting time direct regulation shooting picture time, rather than time that video camera is triggered.
4) various time control modes can be easily realized very much, can both allow multiple video cameras synchronous a time point
On, different cameras can also be allowed to be shot in specified different time points.
5) it both can be used for the setting of video camera shooting time, and can be used for the detection of video camera shooting time.
Brief description of the drawings
From detailed description below in conjunction with the accompanying drawings to the embodiment of the present invention, of the invention these and/or other side and
Advantage will become clearer and be easier to understand, wherein：
Fig. 1 shows the example arrangement composition of video camera time detecting initialization system 100 according to embodiments of the present invention
Schematic diagram.
Fig. 2 shows that video camera according to embodiments of the present invention shoots the video camera time inspection that timing is detected and/or set
Survey establishing method 200.
Fig. 3 diagrammatically illustrates the state change process that 4*4LED lamp arrays use horse race lamp mode.
Fig. 4 diagrammatically illustrates the dot matrix state in a cycle period of 4*4LED lamp arrays according to embodiments of the present invention
Ergodic process.
Fig. 5 (a), 5 (b) show the dot matrix state and the dot matrix state after initialization of initialization operation, and Fig. 5 (b) is
State 0 in 8*8LED dot matrix status switches, the state duration be 0.1ms, i.e. 0 moment between 0.1ms state (with
State 0 goes out current moment for initial time).
The image that Fig. 6 is represented be the time for exposure from 0.3ms to 0.7ms when taken LED array image.
Fig. 7 shows a LED array image.
Fig. 8 shows the average value and the table of mean square deviation that obtained each coding method testing result is calculated based on experimental result
Lattice.
Fig. 9 shows 5 kinds of coding methods for more than, is t in controlling cycle using the matrix for including n LEDdur,
Time for exposure is texpUnder conditions of com-parison and analysis result.
Embodiment
In order that those skilled in the art more fully understand the present invention, with reference to the accompanying drawings and detailed description to this hair
It is bright to be described in further detail.
Before introduction, explain about term implication herein.
Lamp array, lamp array of the invention is generalized concept, both comprising the entity lamp array (lamp that is formed of such as being arranged by actual LED
Battle array), also including virtual lamp array (the lamp array pattern such as shown by electronic display unit), in addition, herein, in many cases, lamp
Battle array covers the lamp array arrangement that actual displayed comes out, also contemplated lamp array light on and off controller, refering in particular to only to refer to the arrangement of lamp
Situation, this lamp array saying generally it can be seen from context here is believed and those skilled in the art will not be caused to obscure.
The controlling cycle of minimum the flicker duration, also referred herein as lamp array of lamp array, refers to the lasting minimum of each state
Time, then enter hereafter dot matrix state.
The cycle period of lamp array, refers to the time that all state traversals of dot matrix status switch are undergone for one time, such as false
If lamp array has 1,2 ..., m dot matrix state, then state 2, state 3 are being changed to from the order of dot matrix state 1 until state m
Afterwards, dot matrix state 1 next will be returned to, experience dot matrix state sequence variation is repeated, here to dot matrix since dot matrix state 1
State m terminate between time, referred to as dot matrix cycle period.
Fig. 1 shows the example arrangement composition of video camera time detecting initialization system 100 according to embodiments of the present invention
Schematic diagram.
As shown in figure 1, video camera time detecting initialization system 100 includes lamp array change in pattern part
110th, multiple video cameras 120 and processor 130.
Lamp array change in pattern part 110, is arranged by predetermined pattern and is formed by multiple entities or virtual lamp, can operate to press
Each lamp is caused to carry out light on and off according to predetermined dot matrix status switch, with predetermined cycle period, lamp array minimum flicker duration can be true
It is fixed.Multiple video cameras 120, can shoot timing to fix frame per second or adjustable frame per second shooting image, and receive the target of setting.Place
Device 130 is managed, the image of video camera shooting can be received, and recognizes the pattern of the flicker of the lamp array in image, picture quilt is thus judged
The time of shooting, so that it is determined that video camera shoots the skew between timing and the target shooting timing of setting, and based on described
The shooting timing for offseting to regulate and control video camera.
Lamp array change in pattern part 110 (being hereafter often referred to simply as lamp array) can be the actual lamp of actual lamp bank row
Battle array, for example, the LED battle array that lamp array can be formed to be arranged by LED.Lamp array change in pattern part 110 can also be, for example, by
The graphic user interface of electronic unit is formed, such as the virtual lamp array shown on mobile phone or tablet personal computer..
Hereinafter tell about conveniently, related description will be carried out by taking LED battle array as an example.
The size and arrangement form of lamp array can be designed as needed, can be square formation, for example 8*8 square formations, 16*16 square formations
Etc., it will be appreciated that can also be, for example, rectangle very tired, circular array or even the array of irregular shape etc..
On the minimum flicker duration of lamp array, it can be set as needed with technology development, for example, 0.1ms,
I.e. one dot matrix flicker state continues 0.1ms, then switches to next dot matrix flicker state, state is flashed in each dot matrix,
The lamp of determination is glittering, and remaining lamp extinguishes.
Lamp array as shown in Figure 1, LED battle array is outer to be with a ring box, is preferably monochromatic frame, while in four angles extremely
There is angle point pattern on few two, all pattern preferably on four angles so that shoot obtained image for LED battle array and be easy to image
Identify and navigate to LED battle array.
The dot matrix state sequence pair of lamp array is extremely important in the time detecting of video camera, describes specific later with reference to accompanying drawing
Example.
Multiple video cameras 120 can shoot fixed to fix frame per second or adjustable frame per second shooting image, and receive the target of setting
When.
Preferably, for ease of describing follow-up time control, these video cameras possess following characteristic：A) there is same frame
Rate；B) clock accuracy inside video camera is accurate, and long-play error is smaller, such as continuously runs 1 day error
No more than 1 second；C) control of video camera shooting time can be realized by certain means, such as can according to order start or
Stop shooting etc..
Each desired shooting time of video camera can be set by certain means, such as can be directly by video camera
Button manually set or USB or for example pass through special remote control, mobile phone or utilize special server example
Such as 130 set of time target is sent to the video camera via network, and the parameters such as the frame per second of video camera can also be set.
The frame per second of video camera can for such as 25 frames/second, 30 frames/second etc. common frame per second, or it is lower or more
High frame per second, the present invention is not limited frame per second.
Multiple video cameras 120 are disposed on the position for needing to be shot.The above-mentioned LED battle array flashed is placed on
Before multiple video cameras.If multiple video cameras can photograph LED battle array simultaneously, LED battle array can be allowed to be placed on some fixation
Position is motionless；, can be mobile by LED battle array if multiple video cameras can not photograph LED battle array simultaneously, difference is put into turn to be taken the photograph
In the shooting area of camera.No matter which kind of above-mentioned scheme, be required to allow video camera can clearly photograph LED battle array.
Each video camera 120 can communicate with processor 130, send the image of shooting to processor, can also connect
Receive the shooting time set instruction of processor.
Each video camera 120 can also communicate with LED battle array scintillation system, to know that for example minimum of LED battle array flashes
Temporal information.
Processor 130 can receive the image of video camera shooting, and recognize the pattern of the flicker of the lamp array in image, thus sentence
Determine the time that picture is taken, so that it is determined that video camera shoots the skew between timing and the target shooting timing of setting, and
Regulate and control the shooting timing of video camera based on the skew.
Processor 130 can be concentrated in a server, as shown in Figure 1.But, this non-is used as limits, processor
It can also be distributed in each video camera, the processor in each video camera can perform above-mentioned work(for itself video camera
Can, that is, the pattern of the lamp array flicker in itself camera review is recognized, the time that picture is taken thus is judged, so that it is determined that from
Skew between body video camera shooting time and the own target shooting time of setting, and itself is regulated and controled based on the skew
The shooting time of video camera.So each video camera itself can recognize the dot matrix image of shooting, detect the time itself shot,
And according to such as keeper set shooting time come adjust itself shooting timing.
Processor 130 can shoot or adjust frame per second order by sending pause to change the shooting timing of video camera.
Suspend image pickup method for example as follows：Every video camera is according to the skew for calculating that two field picture and object time
(can the processor of video camera itself calculate, or extraneous server calculates and notified video camera), allow the video camera
Suspend, shooting is restarted again in the suitable time.Then continue to detect the shooting by controller or video camera itself
The shooting timing of machine, calculates the deviation shot between timing and target shooting time detected, continues to be carried out according to the deviation
Shooting time is adjusted, until the deviation of detected time and object time are in the default error allowed band of some predetermined
It is interior.
Determination on restarting shooting time in pause image pickup method, can be according to sending the order moment to video camera
Reality carries out the distribution of the time delay t between shooting time to determine.Inventor's Primary Study is found, if being issued to from order
Video camera is actual shot between time delay be t, the t meets certain probability distribution, can be obtained by historical statistics
To t probability distribution, then according to t probability distribution and object time, the optimal order of selection sends the time to video camera
Shooting time is adjusted.
After the completion of the above-mentioned shooting time set program to multiple-camera, you can allow multi-camera system in the regular hour
Interior to be shot, the shooting timing (time sequencing) of each video camera meets predetermined set of time requirement.So can with it is low into
This low frame rate camera obtains high frame rate camera to configure, and can obtain the high frame rate camera of variable frame rate.
Here configured on video camera that can be special for the form of video camera or such as electronic installation
The video camera set on video camera, such as smart mobile phone, so can set accurate shooting time, Er Qieji to smart mobile phone
Platform smart mobile phone joint is shot, and can obtain the shooting effect of high frame rate camera, by arranging that camera position and adjustment are clapped
Timing is taken the photograph, full-angle synchronous shooting effect can be obtained.This applies merely illustrative, and those skilled in the art can utilize as needed
The technology of the present invention is much applied.
It should be noted that because the clock inside video camera has certain drift (for example, the shooting of inventor's experiment
Machine probably drift can about drift about 1 second or so for 24 hours), therefore synchronized multi-camera system is in time precision guarantee
On have a scope, overlong time then needs that the time is detected and set again.
In one example, LED battle array is placed in the shooting area of multiple-camera always or in turn, so as to multiple-camera
Constantly time precision can be adjusted and be controlled.
In one example, using the multiple-camera shooting time detection technique of the present invention, to existing multiple-camera system
The time control result of system is detected, judges whether detected multi-camera system meets predetermined time requirement.
Fig. 2 shows that video camera according to embodiments of the present invention shoots the video camera time inspection that timing is detected and/or set
Establishing method 200 is surveyed, known to video camera current frame rate.
In step S210 so that LED battle array is dodged according to predetermined dot matrix status switch, with predetermined cycle period
Bright, lamp array minimum flicker duration can determine.
In step S220, video camera shoots the image of LED battle array.
In step S230, the pattern that lamp array flashes in the image is recognized by processor, according to the flicker state identified
Thus the time that picture is taken is judged, so that it is determined that video camera shoots inclined between timing and the target shooting timing of setting
Move, and based on the shooting timing offset to regulate and control video camera.
The flashing mode of LED battle array according to embodiments of the present invention is described below in detail, sometimes below also referred to as LED
The coded system of lamp array.
LED battle array flashing mode design final goal be：When video camera photographs a frame picture, can more it hold
Pattern inverse in the easy LED battle array according to 8x8 goes out the time of pattern shooting.
It should be noted that inventor tested the coded system of a variety of LED battle arrays, including：Horse race lamp (stream
Water) coding method, binary coding method, Gray code method for expressing, union Gray code method, packet Gray code method, finally
It has devised preferred carry flowing water coded system (alternatively referred to as group carry horse race lamp coded system).
Before the carry flowing water coding method of the preferred embodiment of the present invention is discussed in detail, below brief once invent
The above-mentioned lamp array coded system of people's experiment, and inventor design the invention thought of carry flowing water coded system.
Lamp array coded system according to embodiments of the present invention will be illustrated by taking 8*8 lamp arrays and 4*4 lamp arrays as an example below.
Scheme 1) horse race lamp, alternatively referred to as flowing water coding method, control LED dot matrix are only one in a controlling cycle
LED is lighted, and next LED is lighted during next cycle, and the LED that a upper cycle lights is extinguished.Each LED is according to by a left side
Lighted successively to right, order from top to bottom.
For 8*8 dot matrix, i.e. 8*8LED lamps are lighted in turn, and the 1st lamp is lighted in recycling after the 64th lamp extinguishes, so past
It is multiple.
Fig. 3 diagrammatically illustrates the state change process that 4*4LED lamp arrays use horse race lamp mode.Each LED is according to by a left side
Lighted successively to right, order from top to bottom.When last LED, i.e., after D4 lamps are lighted, during next cycle D4 lamps extinguish,
A1 lamps are lighted, and carry out subsequent cycle.
Scheme 2) binary representation method, for 8*8 dot matrix, 64 lamps are considered as 64 bit, whole lamp array regards one as
Individual 64bit lint-long integer, moves in circles change by 00,01,10,11,00,01 ... rule change of similar 2bit lint-long integers.
Scheme 3) Gray code method for expressing, for 8*8 dot matrix, 64 lamps are considered as 64 bit, whole lamp array is considered as one
Individual 64bit coding, the coding rule of Gray code requires at most there was only 1 bit difference between any two adjacent codings, than
As the change procedures of 3 Gray codes is：000、001、011、010、110、111、101、100、000、001...
Scheme 4) union Gray code method, the mutation of the 3rd kind of Gray code scheme, by it be designed as multiple (such as 3) even
Sequel code union be Gray code.
Scheme 5) it is grouped Gray code scheme in Gray code method (hereinafter, being sometimes referred to as grouped supercomposed coding), the 3rd
Mutation, i.e., be that change between Gray code, but different group is endless by the changing rule that 64 LEDs are divided into some groups, every group
It is complete synchronous, the last time is positioned by multigroup recognition result.
Whole LEDs are divided into N groups, the number of every group of LED by carry flowing water coded system according to embodiments of the present invention
More than or equal to 3；Every group of LED enters line flicker in the way of horse race lamp；There is hierarchical relationship between group, the only group of inferior grade is completed
One flicker cycle, adjacent thereto high-grade group could enter next flicker state, and so on circulate.
The embodiment of the present invention is that horse race lamp mode is performed in group, that is, organizes interior any instant only one of which LED bright；But
Hierarchical relationship between group, it is assumed that with N groups, then according to order from low to high, referred to as the 1st group, the 2nd group ... N group, different groups
Between can there is lamp to light simultaneously.Hereinafter, sometimes referred to as such a mode is carry flowing water coding method.
According to one embodiment of the invention, the lattice-like in a cycle period of the dot matrix under carry flowing water coded system
State change procedure is as follows.
First, all lamps extinguish when dot matrix is initialized, and then every group of first lamp is lighted simultaneously.
Follow-up process is as follows, wherein being first to N according to from the lowest class group to the serial number of highest ranking group
Group：Since first group, since first LED of this group, light in turn, after last lamp extinguishes, next step will be circulated
Lighted again by first lamp of the group, while second group of first lamp also extinguishes, it is bright that second group of second lamp prepares beginning electricity；
Afterwards after second group of all lamp was all lighted, second group of recycling is lighted, while the 3rd group of first lamp extinguishes, the
Two lamps are lighted；So repeatedly, after all LEDs of N groups light a circle, lower whorl following since first group is started again
Ring.
Fig. 4 diagrammatically illustrates the dot matrix state in a cycle period of 4*4LED lamp arrays according to embodiments of the present invention
Ergodic process.
In Fig. 4, it is horizontal often go in 4 LEDs constitute one group, first group of the corresponding behaviors of A, then B, C, D each group
Grade is raised successively.Each LED is lighted successively according to flowing water coding method in every group.For minimum group of grade, i.e., first group, often
Individual controlling cycle extinguishes the LED currently lighted, and lights next LED.After last LED is extinguished in group, first
LED is lighted, and is circulated successively.For other tier groups, only when last LED of its inferior grade group is extinguished, send into
Position signal, which is given in the tier group, the group, can just occur LED light on and off change, extinguish the LED currently lighted, light next
LED.
Assuming that the time span of controlling cycle is tdur, LED dot matrix are divided into k groups, every group comprising ni (i=0,1,2 ...,
K-1) individual LED, the Cycle Length of every group of interior each LED light on and off change is ti.The period of change of the lowest class group and control
Cycle time is identical, i.e. t1=tdur.Because only that when in first group all LED circulation changes once after just can be to second group
Carry signal is sent, so the period of change of the second tier group is n1*t1.Similarly then i-th group of period of change is：
Under normal circumstances, the time for exposure t of cameraexpIt is longer than controlling cycle, therefore the image photographed in camera
Inside there is more than one LED to be lit.Meanwhile, texpIt is smaller than all LED period of change sum n in highest ranking groupk*
tk, therefore there is more than one LED to be extinguishing in the image that camera is photographed.I-th group can be necessarily found, makes it
Meet
ti≤texp≤ni*ti (2)
When going out present condition superposition in the image photographed, all LEDs are lit in group of the grade less than i；I-th group
Interior part LED is lit, and part is extinguished；Grade has one or two LED to be lit in the group higher than i.It is high for grade
In any group of i, when last of inferior grade group adjacent thereto is lit with first LED, illustrate there is carry letter
Number produce, therefore there are two lamps to light in the group, otherwise only one lamp is lighted.When photograph one be filled foot it is described above
After LED dot matrix pictures, the not all tier group i lighted of first LED is found first；Then judge that i-th group and grade are higher than i
Group in first LED for being lit, mark its position respectively Pi, Pi+1,…,Pk.Then the shooting time of camera is：
Understood according to formula (3), the accuracy of detection of shooting time is the period of change t of each LED in i-th groupi.According to
Formula (1) is understood to improve accuracy of detection, can reduce the quantity of LED in controlling cycle and inferior grade group.While formula
(2) t is requiredexp≤ni*ti, it is necessary to increase the number of LED in i-th group simultaneously.Therefore carried out using the coding method of carry flowing water
, can be by reducing in the quantity of LED in controlling cycle length and inferior grade group, high-grade group of increase when shooting time is detected
The quantity of LED improves accuracy of detection.
For the ease of it is further understood that carry flowing water coding staff according to the preferred embodiment of the invention
The advantage of formula, the particular problem that will be dissected the target of LED battle array identification first below and wherein run into.
The target of LED battle array Scintillation protocol design is to when video camera photographs a frame picture, can be relatively easy to
According to LED battle array in pattern inverse go out the pattern shooting time.But it is related to following problem among these：
Problem 1) LED battle array whole flicker cycle it is long.For example, for 8*8LED lamp arrays, the flicker of LED battle array
Cycle expectation reaches 10 minutes or longer, because when the process set by LED battle array to video camera is to need some
Between, if whole cycle falls short of, the picture that video camera is photographed belongs to a cycle or second period on earth
Etc the problem of will perplex time inverse algorithm so that inverse algorithm becomes complex, in addition can not inverse so that can not
Video camera shooting time is set and detected well.Than scheme 1 described above) horse race lamp coded system be just unsatisfactory for
The requirement of the restriction.
Problem 2) video camera shooting time and LED battle array scintillation time stationary problem.Because when video camera starts to clap
Taking the photograph when next frame and LED battle array start to flash the two time points next time can not be point-device synchronous, therefore shooting
Former and later two states of a frame picture captured by machine comprising LED battle array flicker are the events of a unusual maximum probability, if this
Plant the flicker of LED battle array in the situation that border overlay occurs for video camera shooting time to occur, the flash pattern of former and later two LEDs gust
Overlap, successive image identification division can be allowed recognition result mistakenly not to be pointed into a wrong time,
Or at least this mistake should not be very big in all cases.Based on this reason, such scheme 2) binary coding
Mode and other substantial amounts of lamp array blinking coding schemes can not all meet that above-mentioned identification is not made mistakes or mistake is not necessarily very
Big requirement.Scheme 3) Gray code can meet the requirement, but Gray code is the problem of also have Gray code, including can not solve
The problem of below 3).
Problem 3) camera shutter time length and LED a battle array time span of flicker relation.If video camera exposes
Light time span is less than or equal to the time span of LED battle array flicker once, then the problem of only producing described in above-mentioned second point is used
Scheme 3) Gray code can realize the accurate target of image recognition substantially, and the time accuracy maximum of recognition result will not surpass
Cross 2 times of LED battle array scintillation times (this can prove to draw, but omit proof procedure herein to concentrate on main points).But it is real
Because camera shutter time can not be too short on border, often occur camera shutter time than the LED battle array time of flicker
Length will be grown, and even grow many situations and occur.It is 3 times of LED battle array flicker duration such as to assume the time for exposure, so will
Cause in the single exposure time, have 3-4 lamp array flicker, if at this moment continuing the Scintillation protocol using Gray code, will cause
Identification worst error increases to 16 LED battle array flicker durations.For this problem, we have studied scheme 4) union Gray code
With scheme 5) packet Gray code mode, intend reduction identification worst error.But do not obtain good result, and problem ratio
Above-mentioned situation is also increasingly complex.If knowing camera shutter time, it is necessary to which this parameter is input in system in advance, so that
Appropriate LED battle array scintillation time is set according to the time for exposure, and such operating process is more complicated.And further, root
According to the experiment of our early stages, it has been found that the time for exposure of video camera actually can photograph the total time of lamp array flicker simultaneously with it
Inconsistent, such as the time for exposure is 10ms, and LED battle array flashes a 1ms, and video camera should be able to photograph LED battle array in theory
10 times flicker, but experiment find 3-4 flicker can only be photographed in our experimental situation.If it is to be understood that one is taken the photograph
Effective shooting time is how many on earth in the camera time for exposure, it is desirable to have a measurement process, and this further causes entirely mistake
The complexity of journey.The problem Producing reason may be related to video camera sensor devices CCD physical characteristic, it is also possible to LED
The characteristics such as the brightness of flicker are relevant, and concrete reason need to be furtherd investigate, nevertheless, scheme 4 in this case) union
Gray code and scheme 5) packet Gray code mode be not preferred.
1) the carry flowing water coded system of the preferred embodiment of the present invention, can solve the above problems to 3) well.
Taking the photograph for foundation carry flowing water coding method according to embodiments of the present invention hereafter will be illustrated by taking 8*8LED dot matrix as an example
Camera time detecting method example, and explain why can preferably solve the above problems 1) to 3).
Here, suppose that a length of 0.1ms during LED battle array minimum flicker.
Fig. 5 (a), (b) show the dot matrix state and the dot matrix state after initialization of initialization operation, and Fig. 5 (b) is 8*
State 0 in 8LED dot matrix status switches, the state duration is for 0.1ms, i.e. 0 moment to the state between 0.1ms (with shape
State 0 goes out current moment for initial time).
First group is referred to as the lowest class group, and each LED scintillation time is 0.1ms, is opened from first LED of this group
Begin, light in turn, take time 0.8ms altogether, after the 8th lamp extinguishes, next step will be circulated and lighted again by first lamp of the group, together
When second group of first lamp also extinguish, second group of second lamp prepares to start to light.Afterwards when second group of 8 lamp is all lighted
After crossing, second group of recycling is lighted, while the 3rd group of first lamp extinguishes, second lamp is lighted.So when the 8th group,
Be referred to as highest ranking group, 8 LED light after a circle, amount to the used time need 0.1x88=1677721.6 milliseconds=
1677.7216 seconds, about 28 minutes, problem stated before 1 can be met) require.And can be using smaller flicker week
Phase (such as 0.01ms), more LEDs (such as 16x16 LED battle array), or adjustment LED battle array packet mode etc. are very just
Prompt adjustment obtains desired scintillation time frequency and whole cycle duration.
When the time of video camera shooting is across two minimum flicker durations, i.e., 0.1ms above in example now occurs
The situation that two LEDs are all imaged on ccd sensor.Follow-up image recognition algorithm, can recognize two LEDs simultaneously
Light, maximum time identification error namely 2 flickers duration, i.e. 0.2ms.And image recognition algorithm can be according to two
The bright dark difference of LED, makes more accurately time judgement, further improves time accuracy of identification.It should be noted that avoiding every
No less than 3 LEDs of individual LED light group, because if only 2 LEDs, it would be possible to occur that it is first LED that can not judge
Lamp is first bright, bright after second LED；Still it is bright after first LED on the contrary, second LED is first bright.Even if in addition, two
Group or multiple groups are at flicker state switching state, can also obtain accurate by the identification to LED system of battle formations picture
Time judges that no more than 2 LED of maximum time identification error flash durations.In summary, the carry flowing water of the embodiment of the present invention
Coded system can solve problem stated before 2).
For problem stated before 3), the carry flowing water coded system of the embodiment of the present invention also gives solution well
Scheme.The carry flowing water coded system of the embodiment of the present invention is without measuring the real exposure time of video camera, without to system
Middle input exposure time parameter, both can be to image as long as flashing duration (than 0.1ms as previously mentioned) with fixed minimum
Effectively recognized, determine the time.During such as every group of 8 LED, have when video camera was photographed in inferior grade group no more than 7
When LED is lighted, now no matter the LED light group of greater degree is that only one of which LED is bright or have bright (same group of 2 LEDs
In not over 2 LEDs light), can be determined that out that the interlude that video camera shoots the frame is above-mentioned multiple LED points
Bright interlude.If there is 8 LEDs to be imaged in the picture in inferior grade group, illustrate that video camera actually photographed when
Between exceeded 0.8ms, now can have 2 or more lamps from the LED light group of a high grade be imaged in the picture,
Therefore recognizer will provide time result of determination in the high-grade LED light group image, time judgement precision also will be
The flicker duration of the high other lamp group of one-level, such as be 1ms.The exposure time of this explanation video camera has exceeded 1ms, during video camera
Between judgement precision be 1ms be rational.
The image that Fig. 6 is represented be the time for exposure from 0.3ms to 0.7ms when taken LED array image.
For Fig. 7 LED array image, according to above-mentioned computational methods, it is known that its time represented is 0.1ms* (2*85+
5*84+3*83+1*82) -1ms/+3ms, it is
0.1ms*(2*85+5*84+3*83+1*82) -1ms or 0.1ms* (2*85+5*84+3*83+1*82)+3ms。
It is described on end, the image that the carry flowing water coded system of the embodiment of the present invention can be arrived by shot by camera,
Identified with rational precision can change in the shooting time midpoint of video camera, carry pipeline mode be：All LEDs
It is divided into how many groups；Each group includes how many LEDs, and the LED quantity of difference group need not be consistent, but the LED of a group
Lamp should not be less than 3；The most fast flicker frequency of the LED of the lowest class group；Each several LEDs flash simultaneously.
The video camera shooting time test experience that inventor is carried out for various lamp array coded systems also demonstrate that carry
The superiority of flowing water coded system.During experiment, LED dot matrix are shot using camera, continuous 100 two field picture is obtained,
The dot matrix state of analysis interior display per two field picture, calculates the time interval changed between the dot matrix taken by consecutive frame, with reason
It is compared by value 40ms, so that it is determined that Detection results of each coding method to shooting time.Calculated and obtained based on experimental result
The average value and mean square deviation of each coding method testing result are as shown in Fig. 8 forms.
Experiment finds that four kinds of coding methods can detect the time interval between consecutive frame, and the level values of detection are equal
In 40ms or so.But during using binary coding method, shooting time detection error rate is higher, the time between two obtained frames
Difference fluctuation is larger, calculates obtained time difference mean square deviation also with regard to larger, LED points in each two field picture photographed due to video camera
Paroxysm life superposition, causes to detect the time interval between the consecutive frame of mistake, and maximum improper value reaches 256ms.Using Gray
During code encoding method, the situation of detection mistake is equally existed, but detection error rate is better than binary coding method, testing result
Mean square deviation is also better than binary approach, but still has the detection error of indivedual frames larger, and maximum error detection value is 288ms.
During using flowing water coding method, it is possible to prevente effectively from the detection mistake that state superposition is caused so that the fluctuation of testing result is significantly
Reduce, detection error rate is far below first two method, but because the global cycle cycle of the coding method is shorter, in processing shooting figure
As when, it is necessary to residing for the LED dot matrix photographed are set manually cycle period order, otherwise testing result can be impacted.
During using carry flowing water coding method, best testing result can be obtained, detection error is minimum and mean square deviation is also minimum, profit
The detection function for camera shooting time can be realized with this method.
Fig. 9 shows 5 kinds of coding methods for more than, is t in controlling cycle using the matrix for including n LEDdur,
Time for exposure is texpUnder conditions of be compared, comparative result is as shown in Fig. 9 tables.
Compared by Fig. 9 as can be seen that the flowing water coding global cycle cycle is too short, it is necessary to which detector includes more LED
Detection demand can be met；There is identification error in binary coding and gray encoding, it is impossible to accurate in the case where state is superimposed
Shooting time is detected, and needs the camera time for exposure shorter；It is grouped Gray code (packet supercomposed coding) and is carrying out high-precision inspection
Camera shorter time for exposure or detector is needed to include more LED during survey；It is several that carry flowing water coding overcomes the above
The problem of method of kind is present, can carry out high precision test.
Overview is got up, and following technical proposals are provide at least herein.
(1) a kind of, lamp array scintillation system for video camera time detecting and/or setting, including：
Lamp array, can be operated according to predetermined dot matrix status switch, with predetermined cycle period so that the progress of each lamp is bright
Go out, lamp array minimum flicker duration can determine；
Lamp array light on and off controller, it is described for according to the predetermined dot matrix status switch, the predetermined cycle period
Minimum flashes duration to control the light on and off of each lamp in lamp array.
(2), according to the LED of (1) battle array scintillation system, the lamp in the lamp array is LED, wherein
Whole LEDs are divided into N groups, and the number of every group of LED is more than or equal to 3；
Every group of LED enters line flicker in the way of horse race lamp；
There is hierarchical relationship between group, the only group of inferior grade completes a flicker cycle, high-grade group of ability adjacent thereto
Into next flicker state, and so on circulate.
(3), according to the lamp array scintillation system of (2), dot matrix lamp all when initializing extinguishes, and then every group of first lamp is same
When light；
Follow-up process is as follows, wherein being first to N according to from the lowest class group to the serial number of highest ranking group
Group：
Since first group, since first LED of this group, light in turn, after last lamp extinguishes, next step will
Circulation is lighted again by first lamp of the group, while second group of first lamp also extinguishes, second group of second lamp prepares to start
Electricity is bright；Afterwards after second group of all lamp was all lighted, second group of recycling is lighted, while the 3rd group of first lamp puts out
Go out, second lamp is lighted；So repeatedly, after all LEDs of N groups light a circle, lower whorl is started again since first group
Circulation.
(4), according to the lamp array scintillation system of (2) or (3), wherein the different group of the quantity that there is lamp.
(5), according to the lamp array scintillation system of (2) or (3), the LED battle array light on and off controller utilizes field programmable gate
Array FPGA is realized.
(6), according to the lamp array scintillation system of (2) or (3), LED battle array and LED the battle array light on and off controller is integrated into
In one portable set.
(7), according to the lamp array scintillation system of (2) or (3), LED battle array is fixed in determination position so that all video cameras
LED battle array can be photographed.
(8), according to the lamp array scintillation system of (2) or (3), the LED battle array is outer to be with the monochromatic frame of a circle, while four
In individual angle at least two on have angle point pattern so that shoot obtained image for LED battle array and be easy to image recognition to go out and determine
LED battle array is arrived in position.
(9), according to the lamp array scintillation system of (2) or (3), when camera shutter time is more than the minimum flicker of LED battle array
It is long.
(10), according to the lamp array scintillation system of (2) or (3), the cycle period of the dot matrix status switch of LED battle array is enough
It is long, enable to determine the flicker cycle of the LED battle array belonging to the picture of video camera shooting.
(11) a kind of, video camera time detecting initialization system that time detecting and/or setting are carried out to video camera, including lamp
Battle array, multiple video cameras and processor,
Lamp array is arranged by predetermined pattern by multiple lamps and formed, and can be operated according to predetermined dot matrix status switch, with pre-
Fixed cycle period causes each lamp to carry out light on and off, and lamp array minimum flicker duration can determine；
Multiple video cameras, can shoot timing to fix frame per second or adjustable frame per second shooting image, and receive the target of setting；
Processor, can receive the image of video camera shooting, and recognize the pattern of the flicker of the lamp array in image, thus judge
The time that picture is taken, so that it is determined that video camera shoots the skew between timing and the target shooting timing of setting, Yi Jiji
Regulate and control the shooting timing of video camera in the skew.
(12), according to the video camera time detecting initialization system of (11), processor shoots or adjusted by sending pause
Frame per second order come change video camera shooting timing.
(13), according to the video camera time detecting initialization system of (11), the processor is concentrated in a server.
(14), according to the video camera time detecting initialization system of (11), the processor is distributed in each video camera,
Processor in each video camera can perform above-mentioned functions for itself video camera, that is, recognize the lamp in itself camera review
The pattern of battle array flicker, thus judges time for being taken of picture, so that it is determined that itself video camera shooting time and setting itself
Skew between target shooting time, and the shooting time of itself video camera is regulated and controled based on the skew.
(15), according to the video camera time detecting initialization system of (11), the shooting of video camera is regulated and controled based on the skew
Time includes：
Statistics sends the shooting order moment to video camera to the time delay t between the video camera actual photographed moment；
Determine t probability distribution；
According to t probability, selection sends the opportunity for shooting order.
(16), according to the video camera time detecting initialization system of (11), after the scheduled time after set-up is complete, weight
It is new that time detecting and setting are carried out to multiple video cameras.
(17), according to the video camera time detecting initialization system of (11), wherein
Whole LEDs are divided into N groups, and the number of every group of LED is more than or equal to 3；
Every group of LED enters line flicker in the way of horse race lamp；
There is hierarchical relationship between group, the only group of inferior grade completes a flicker cycle, high-grade group of ability adjacent thereto
Into next flicker state, and so on circulate.
(18), according to the video camera time detecting initialization system of (17), dot matrix lamp all when initializing extinguishes, then often
First lamp of group is lighted simultaneously；
Follow-up process is as follows, wherein being first to N according to from the lowest class group to the serial number of highest ranking group
Group：
Since first group, since first LED of this group, light in turn, after last lamp extinguishes, next step will
Circulation is lighted again by first lamp of the group, while second group of first lamp also extinguishes, second group of second lamp prepares to start
Electricity is bright；Afterwards after second group of all lamp was all lighted, second group of recycling is lighted, while the 3rd group of first lamp puts out
Go out, second lamp is lighted；So repeatedly, after all LEDs of N groups light a circle, lower whorl is started again since first group
Circulation.
(19), according to the video camera time detecting initialization system of (18), when the illuminating state of LED battle array be not belonging to it is described pre-
During fixed dot matrix status switch, the dot matrix state of candidate is judged, then according to the point identified in the image of previous predetermined frame number
Bright state, with reference to the frame per second of the minimum flicker duration of LED battle array and video camera, to determine probability highest dot matrix state candidate's conduct
The current dot matrix state finally identified, and then determine to shoot the timing of correspondence picture.
(20), according to the video camera time detecting initialization system of (11),
Assuming that the time span of controlling cycle is tdur, LED dot matrix are divided into k groups, every group comprising ni (i=0,1,2 ...,
K-1) individual LED, the Cycle Length of every group of interior each LED light on and off change is ti.The period of change of the lowest class group and control
Cycle time is identical, i.e. t1=tdur.Because only that when in first group all LED circulation changes once after just can be to second group
Carry signal is sent, so the period of change of the second tier group is n1*t1.Similarly then i-th group of period of change is：
The time for exposure t of cameraexpBe longer than controlling cycle, thus have in the image that camera is photographed one with
On LED be lit.Meanwhile, texpIt is smaller than all LED period of change sum n in highest ranking groupk*tk, therefore taking the photograph
As there is more than one LED to be extinguishing in image that head is photographed.I-th group can be necessarily found, it is met
ti≤texp≤ni*ti (2)
When going out present condition superposition in the image photographed, all LEDs are lit in group of the grade less than i；I-th group
Interior part LED is lit, and part is extinguished；Grade has one or two LED to be lit in the group higher than i.It is high for grade
In any group of i, when last of inferior grade group adjacent thereto is lit with first LED, illustrate there is carry letter
Number produce, therefore there are two lamps to light in the group, otherwise only one lamp is lighted.When photograph one be filled foot it is described above
After LED dot matrix pictures, the not all tier group i lighted of first LED is found first；Then judge that i-th group and grade are higher than i
Group in first LED for being lit, mark its position respectively Pi, Pi+1,…,Pk.Then the shooting time of camera is：
(21), according to the video camera time detecting initialization system of (20), duration is flashed and low by reducing lamp array minimum
The quantity of LED in level group, and increase the quantity of LED in high-grade group to improve accuracy of detection.
(22), according to the video camera time detecting initialization system of (11), wherein the different group of the quantity that there is lamp.
(23), according to the video camera time detecting initialization system of (11), the bright scheme of LED lattice point is one below：
The mutation of Gray code, i.e., the union of multiple continuous programming codes is Gray code；
Gray code is grouped, is between Gray code, but different groups by the changing rule that whole LEDs are divided into some groups, every group
Change it is not exclusively synchronous.
(24), according to the video camera time detecting initialization system of (11), the LED battle array light on and off controller can using scene
Gate array FPGA is programmed to realize.
(25), according to the video camera time detecting initialization system of (11), LED battle array and LED the battle array light on and off controller
It is integrated into a portable set, by the way that such portable set is carried to each video camera to be taken the photograph by each
Camera is photographed respectively, and time detecting and/or calibration are carried out to corresponding video camera.
(26), according to the video camera time detecting initialization system of (11), the time detecting and/or it is calibrated to iterative mistake
Journey, is detected after often calibrating, and judges the skew between current shooting timing and target timing, until the skew is less than predetermined
Threshold value.
(27), according to the video camera time detecting initialization system of (11), LED battle array is fixed in determination position so that institute
There is video camera to photograph LED battle array.
(28), according to the video camera time detecting initialization system of (11), the LED battle array is outer to be with the monochromatic frame of a circle,
There is angle point pattern at least two in four angles simultaneously so that shoot obtained image for LED battle array and be easy to image knowledge
Do not go out and navigate to LED battle array.
(29), according to the video camera time detecting initialization system of (11), camera shutter time is more than the minimum of LED battle array
Flash duration.
(30), according to the video camera time detecting initialization system of (11), the cycle period of the dot matrix status switch of LED battle array
Long enough, to cause controller to can determine the flicker cycle of the LED battle array belonging to the picture that video camera is shot.
(31), a kind of video camera shoots the video camera time detecting establishing method that timing is detected and/or set, and video camera is worked as
Preceding frame per second, it is known that
So that lamp array enters line flicker, lamp array minimum flicker according to predetermined dot matrix status switch, with predetermined cycle period
Duration can determine；
Video camera shoots the image of lamp array；
The pattern that lamp array flashes in the image is recognized by processor, picture quilt is thus judged according to the flicker state identified
The time of shooting, so that it is determined that video camera shoots the skew between timing and the target shooting timing of setting, and based on described
The shooting timing for offseting to regulate and control video camera.
(32), according to the video camera time detecting establishing method of (31), shot or adjustment frame per second life by sending pause
The shooting timing for making changing video camera.
(33), according to the video camera time detecting establishing method of (31), the processor is concentrated in a server.
(34), according to the video camera time detecting establishing method of (31), the processor is distributed in each video camera,
Processor in each video camera can perform above-mentioned functions for itself video camera, that is, recognize the lamp in itself camera review
The pattern of battle array flicker, thus judges time for being taken of picture, so that it is determined that itself video camera shooting time and setting itself
Skew between target shooting time, and the shooting time of itself video camera is regulated and controled based on the skew.
(35), according to the video camera time detecting establishing method of (31), the shooting of video camera is regulated and controled based on the skew
Time includes：
Statistics sends the shooting order moment to video camera to the time delay t between the video camera actual photographed moment；
Determine t probability distribution；
According to t probability, selection sends the opportunity for shooting order.
(36), according to the video camera time detecting establishing method of (31), after the scheduled time after set-up is complete, weight
It is new that time detecting and setting are carried out to multiple video cameras.
(37), according to the video camera time detecting establishing method of (31), wherein
Whole LEDs are divided into N groups, and the number of every group of LED is more than or equal to 3；
Every group of LED enters line flicker in the way of horse race lamp；
There is hierarchical relationship between group, the only group of inferior grade completes a flicker cycle, high-grade group of ability adjacent thereto
Into next flicker state, and so on circulate.
(38), according to the video camera time detecting establishing method of (31), dot matrix lamp all when initializing extinguishes, then often
First lamp of group is lighted simultaneously；
Follow-up process is as follows, wherein being first to N according to from the lowest class group to the serial number of highest ranking group
Group：
Since first group, since first LED of this group, light in turn, after last lamp extinguishes, next step will
Circulation is lighted again by first lamp of the group, while second group of first lamp also extinguishes, second group of second lamp prepares to start
Electricity is bright；Afterwards after second group of all lamp was all lighted, second group of recycling is lighted, while the 3rd group of first lamp puts out
Go out, second lamp is lighted；So repeatedly, after all LEDs of N groups light a circle, lower whorl is started again since first group
Circulation.
(39), according to the video camera time detecting establishing method of (38), when the illuminating state of LED battle array be not belonging to it is described pre-
During fixed dot matrix status switch, the dot matrix state of candidate is judged, then according to the point identified in the image of previous predetermined frame number
Bright state, with reference to the frame per second of the minimum flicker duration of LED battle array and video camera, to determine probability highest dot matrix state candidate's conduct
The current dot matrix state finally identified, and then determine to shoot the timing of correspondence picture.
(40), according to the video camera time detecting establishing method of (31), it is assumed that the time span of controlling cycle is tdur, will
LED dot matrix are divided into k groups, and every group includes the week that each LED light on and off changes in ni (i=0,1,2 ..., k-1) individual LED, every group
Phase length is ti.The period of change of the lowest class group is identical with the controlling cycle time, i.e. t1=tdur.Because only that when in first group
All LED circulation changes once after just can to second group of transmission carry signal, so the period of change of the second tier group be n1*
t1.Similarly then i-th group of period of change is：
The time for exposure t of cameraexpBe longer than controlling cycle, thus have in the image that camera is photographed one with
On LED be lit.Meanwhile, texpIt is smaller than all LED period of change sum n in highest ranking groupk*tk, therefore taking the photograph
As there is more than one LED to be extinguishing in image that head is photographed.I-th group can be necessarily found, it is met
ti≤texp≤ni*ti (2)
When going out present condition superposition in the image photographed, all LEDs are lit in group of the grade less than i；I-th group
Interior part LED is lit, and part is extinguished；Grade has one or two LED to be lit in the group higher than i.It is high for grade
In any group of i, when last of inferior grade group adjacent thereto is lit with first LED, illustrate there is carry letter
Number produce, therefore there are two lamps to light in the group, otherwise only one lamp is lighted.When photograph one be filled foot it is described above
After LED dot matrix pictures, the not all tier group i lighted of first LED is found first；Then judge that i-th group and grade are higher than i
Group in first LED for being lit, mark its position respectively Pi, Pi+1,…,Pk.Then the shooting time of camera is：
(41), according to the video camera time detecting establishing method of (31), duration is flashed and low by reducing lamp array minimum
The quantity of LED in level group, and increase the quantity of LED in high-grade group to improve accuracy of detection.
(42), according to the video camera time detecting establishing method of (31), wherein the different group of the quantity that there is lamp.
(43), according to the video camera time detecting establishing method of (31), the bright scheme of LED lattice point is one below：
The mutation of Gray code, i.e., the union of multiple continuous programming codes is Gray code；
Gray code is grouped, is between Gray code, but different groups by the changing rule that whole LEDs are divided into some groups, every group
Change it is not exclusively synchronous.
(44), according to the video camera time detecting establishing method of (31), the LED battle array light on and off controller can using scene
Gate array FPGA is programmed to realize.
(45), according to the video camera time detecting establishing method of (31), LED battle array and LED the battle array light on and off controller
It is integrated into a portable set, by the way that such portable set is carried to each video camera to be taken the photograph by each
Camera is photographed respectively, and time detecting and/or calibration are carried out to corresponding video camera.
(46), according to the video camera time detecting establishing method of (31), the time detecting and/or it is calibrated to iterative mistake
Journey, is detected after often calibrating, and judges the skew between current shooting timing and target timing, until the skew is less than predetermined
Threshold value.
(47), according to the video camera time detecting establishing method of (31), LED battle array is fixed in determination position so that institute
There is video camera to photograph LED battle array.
(48), according to the video camera time detecting establishing method of (31), the LED battle array is outer to be with the monochromatic frame of a circle,
There is angle point pattern at least two in four angles simultaneously so that shoot obtained image for LED battle array and be easy to image knowledge
Do not go out and navigate to LED battle array.
(49), according to the video camera time detecting establishing method of (31), camera shutter time is more than the minimum of LED battle array
Flash duration.
(50), according to the video camera time detecting establishing method of (31), the cycle period of the dot matrix status switch of LED battle array
Long enough, to cause controller to can determine the flicker cycle of the LED battle array belonging to the picture that video camera is shot.
(51) a kind of, video camera time detecting initialization system that time detecting and/or setting are carried out to video camera, including lamp
System of battle formations case change part, multiple video cameras and processor,
Lamp array change in pattern part, is arranged by predetermined pattern and is formed by multiple entities or virtual lamp, can operate according to
Predetermined dot matrix status switch, with predetermined cycle period each lamp is caused to carry out light on and off, lamp array minimum flicker duration can determine；
Multiple video cameras, can shoot timing to fix frame per second or adjustable frame per second shooting image, and receive the target of setting；
Processor, can receive the image of video camera shooting, and recognize the pattern of the flicker of the lamp array in image, thus judge
The time that picture is taken, so that it is determined that video camera shoots the skew between timing and the target shooting timing of setting, Yi Jiji
Regulate and control the shooting timing of video camera in the skew.
(52), according to the video camera time detecting initialization system of (51), the lamp array change in pattern part is by actual hardware
Lamp bank cloth is formed, or is formed by the graphic user interface of electronic unit.
(53), according to the video camera time detecting initialization system of (51), multiple video cameras, lamp array change in pattern part and place
It can be in communication with each other between reason device.
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.Therefore, protection scope of the present invention should
It should be defined by scope of the claims.
Claims (10)
1. a kind of lamp array scintillation system for video camera time detecting and/or setting, including：
Lamp array, can be operated according to predetermined dot matrix status switch, with predetermined cycle period so that each lamp carries out light on and off, lamp
The minimum flicker duration of battle array can determine；
Lamp array light on and off controller, for according to the predetermined dot matrix status switch, the predetermined cycle period, the minimum
Duration is flashed to control the light on and off of each lamp in lamp array.
2. the lamp in lamp array scintillation system according to claim 1, the lamp array is LED, wherein
Whole LEDs are divided into N groups, and the number of every group of LED is more than or equal to 3；
Every group of LED enters line flicker in the way of horse race lamp；
There is hierarchical relationship between group, the only group of inferior grade completes a flicker cycle, and adjacent thereto high-grade group could enter
Next flicker state, is and so on circulated.
3. lamp array scintillation system according to claim 2, dot matrix lamp all when initializing extinguishes, then every group of first lamp is same
When light；
Follow-up process is as follows, wherein being first to N groups according to from the lowest class group to the serial number of highest ranking group：
Since first group, since first LED of this group, light in turn, after last lamp extinguishes, next step will be circulated
Lighted again by first lamp of the group, while second group of first lamp also extinguishes, it is bright that second group of second lamp prepares beginning electricity；
Afterwards after second group of all lamp was all lighted, second group of recycling is lighted, while the 3rd group of first lamp extinguishes, the
Two lamps are lighted；So repeatedly, after all LEDs of N groups light a circle, lower whorl following since first group is started again
Ring.
4. a kind of video camera time detecting initialization system that time detecting and/or setting are carried out to video camera, including it is lamp array, multiple
Video camera and processor,
Lamp array is arranged by predetermined pattern by multiple lamps and formed, and can be operated according to predetermined dot matrix status switch, with predetermined
Cycle period causes each lamp to carry out light on and off, and lamp array minimum flicker duration can determine；
Multiple video cameras, can shoot timing to fix frame per second or adjustable frame per second shooting image, and receive the target of setting；
Processor, can receive the image of video camera shooting, and recognize the pattern of the flicker of the lamp array in image, thus judge picture
The time being taken, so that it is determined that video camera shoots the skew between timing and the target shooting timing of setting, and based on institute
Skew is stated to regulate and control the shooting timing of video camera.
5. video camera time detecting initialization system according to claim 4, the processor is distributed in each video camera, often
Processor in individual video camera can perform above-mentioned functions for itself video camera, that is, recognize the lamp array in itself camera review
The pattern of flicker, thus judges the time that picture is taken, so that it is determined that itself video camera shooting time and itself mesh of setting
Mark the skew between shooting time, and the shooting time of itself video camera is regulated and controled based on the skew.
6. video camera time detecting initialization system according to claim 4, the lamp array is LED battle array, wherein
Whole LEDs are divided into N groups, and the number of every group of LED is more than or equal to 3；
Every group of LED enters line flicker in the way of horse race lamp；
There is hierarchical relationship between group, the only group of inferior grade completes a flicker cycle, and adjacent thereto high-grade group could enter
Next flicker state, is and so on circulated.
7. video camera time detecting initialization system according to claim 6, dot matrix lamp all when initializing extinguishes, then every group
First lamp is lighted simultaneously；
Follow-up process is as follows, wherein being first to N groups according to from the lowest class group to the serial number of highest ranking group：
Since first group, since first LED of this group, light in turn, after last lamp extinguishes, next step will be circulated
Lighted again by first lamp of the group, while second group of first lamp also extinguishes, it is bright that second group of second lamp prepares beginning electricity；
Afterwards after second group of all lamp was all lighted, second group of recycling is lighted, while the 3rd group of first lamp extinguishes, the
Two lamps are lighted；So repeatedly, after all LEDs of N groups light a circle, lower whorl following since first group is started again
Ring.
8. a kind of video camera shoots the video camera time detecting establishing method that timing is detected and/or set, video camera current frame rate
, it is known that
So that lamp array enters line flicker, lamp array minimum flicker duration according to predetermined dot matrix status switch, with predetermined cycle period
It can determine；
Video camera shoots the image of lamp array；
The pattern that lamp array flashes in the image is recognized by processor, thus judges that picture is taken according to the flicker state identified
Time, so that it is determined that video camera, which shoots target of the timing setting, shoots skew between timing, and based on the skew
To regulate and control the shooting timing of video camera.
9. video camera time detecting establishing method according to claim 8, the lamp array is LED battle array, wherein
Whole LEDs are divided into N groups, and the number of every group of LED is more than or equal to 3；
Every group of LED enters line flicker in the way of horse race lamp；
There is hierarchical relationship between group, the only group of inferior grade completes a flicker cycle, and adjacent thereto high-grade group could enter
Next flicker state, is and so on circulated.
10. a kind of video camera time detecting initialization system that time detecting and/or setting are carried out to video camera, including lamp array pattern
Change part, multiple video cameras and processor,
Lamp array change in pattern part, is arranged by predetermined pattern and is formed by multiple entities or virtual lamp, can be operated according to predetermined
Dot matrix status switch, with predetermined cycle period cause each lamp to carry out light on and off, lamp array minimum flicker duration can determine；
Multiple video cameras, can shoot timing to fix frame per second or adjustable frame per second shooting image, and receive the target of setting；
Processor, can receive the image of video camera shooting, and recognize the pattern of the flicker of the lamp array in image, thus judge picture
The time being taken, so that it is determined that video camera shoots the skew between timing and the target shooting timing of setting, and based on institute
Skew is stated to regulate and control the shooting timing of video camera.
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| CN112822411A (en) * | 2019-11-18 | 2021-05-18 | 富士施乐株式会社 | Information processing apparatus, system and method thereof, lighting apparatus, and recording medium |
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