CN101988669B - Stroboscopic illumination control system for elevator car and control method thereof - Google Patents
Stroboscopic illumination control system for elevator car and control method thereof Download PDFInfo
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- CN101988669B CN101988669B CN2009100577130A CN200910057713A CN101988669B CN 101988669 B CN101988669 B CN 101988669B CN 2009100577130 A CN2009100577130 A CN 2009100577130A CN 200910057713 A CN200910057713 A CN 200910057713A CN 101988669 B CN101988669 B CN 101988669B
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Abstract
The invention discloses a stroboscopic illumination control system for an elevator car, which comprises an elevator car, an illumination apparatus in the elevator car, a monitoring apparatus in the elevator car and a stroboscopic control apparatus. The stroboscopic control apparatus is connected with the monitoring apparatus and acquires a video signal output by the monitoring apparatus, and is also connected with the illumination apparatus and controls to turn on/off the illumination apparatus. The invention also discloses an illumination control method of the system, which comprises the following steps: 1, the stroboscopic control apparatus acquires a shutter signal output by the monitoring apparatus; 2, if no shutter signal is output, the stroboscopic control apparatus acquires a field synchronization signal and/or parity field signal output by the monitoring apparatus to obtain the shutter on/off time point of the monitoring apparatus; and 3, the stroboscopic control apparatus controls to turn on/off the illumination apparatus according to the shutter on/off of the monitoring apparatus. The invention is conducive to reduction of the energy consumption of the illumination apparatus in the car, prolonging of the service life of the illumination apparatus in the car and improvement of the definition during single-frame analysis of the monitored image on the premise of meeting the illumination requirements of the monitoring apparatus in the car.
Description
Technical field
The present invention relates to a kind of Lighting Control Assembly and control method thereof of lift car.
Background technology
In lift car, usually have lighting apparatus and watch-dog.Typical lighting apparatus is for example the LED lamp, for illumination is provided in lift car.Typical watch-dog is for example video camera, by cable, outwards exports the monitor video signal in car, and the surveillance equipment outer for the elevator car shows and/or storage device records in real time.Wherein, lighting apparatus comprises again by the normal illumination equipment of mains supply and battery-powered emergency-lighting set.When grid cut-off, emergency-lighting set will start automatically, by backup battery for the emergency lighting of a period of time is provided in lift car.
In the situation that the electrical network normal power supply, lift car has two states usually: running status and holding state.Generally, lift car is in running status.When lift car, under running status, do not receive signal (comprising signal in car, each stop signal, control centre's signal etc.) and surpass a period of time, namely enter holding state.In the situation that grid cut-off, lift car is in off-position, by emergency-lighting set, provides emergency lighting.
When lift car was in running status, the lighting apparatus normal illumination in car, can meet the interior normal illumination of car and the illumination requirement of watch-dog.
When lift car was in holding state, the lighting apparatus in car had two kinds of control modes.The first control mode, lighting apparatus are closed or are remained with faint light source, and this can reach energy-conservation purpose to greatest extent, but can not meet the lighting demand of the watch-dog in car, cause the monitoring video information in car to be beyond recognition.The second control mode, lighting apparatus is normal illumination still, and this can meet the lighting demand of the watch-dog in car, but does not meet energy-conservation requirement, the service life of also having reduced simultaneously lighting apparatus.
When lift car is in off-position, in car, automatically start emergency-lighting set.Even this moment, the watch-dog in car still can be worked, but, due to the illumination deficiency of emergency-lighting set, still cause the monitoring video information in car to be beyond recognition.
While adopting video camera as watch-dog, the time for exposure of video camera (shutter speed, a speed of expressing one's gratification again) is pre-set, and in case in use generally remains unchanged after setting.Because personnel move in car, the shutter speed that institute's ether is low can cause carrying out the single frames parsing (information in namely recognizing single-frame images at monitored picture, as people's face etc.) time personnel face feature can't clearly recognize, so must improve the speed of shutter.But after the speed of shutter improved, the illumination of car may not meet the requirement of fair speed shutter, thus often need to improve the illumination of car, but too high illumination can make the passenger produce discomfort.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of illumination control method of lift car, and the method can meet the lighting demand of watch-dog in car when lift car is in holding state or off-position, can reach to greatest extent energy-saving effect again.
For solving the problems of the technologies described above, lift car stroboscopic illumination control method of the present invention is: in lift car, have lighting apparatus, watch-dog and frequent flashing control equipment; Described lighting apparatus comprises by the normal illumination equipment of mains supply and battery-powered emergency-lighting set; When grid cut-off, described emergency-lighting set is opened automatically; Described watch-dog is outwards exported the monitor video signal in car in real time by cable; Described frequent flashing control equipment connection watch-dog also gathers the monitor video signal of its output, also connects lighting apparatus and controls its unlatching, closes;
Described method comprises the steps:
The 1st step, when lift car is in holding state, when perhaps lift car is in off-position and the normal operation of watch-dog wherein, described frequent flashing control equipment gathers the shutter signal of described watch-dog output, obtain the time point of the each opening and closing of shutter of watch-dog, enter the 3rd step;
The 2nd step, when described watch-dog is not exported shutter signal, described frequent flashing control equipment gathers field sync signal and/or the parity field signal of described watch-dog output, the shutter of the watch-dog that provides according to manufacturer opens and closes with respect to the sequential relationship of field sync signal or parity field signal or according to test, obtains the time point of the each opening and closing of shutter of watch-dog;
The method of described test is:
The 2.1st step, the time for exposure of setting watch-dog;
The 2.2nd step, according to four kinds of the shutter signal of watch-dog may situations, set respectively the shutter signal identical illumination control signal possible with these four kinds, observe the impact of these four kinds of illumination control signals on the monitor video definition;
Four kinds of the shutter signal of described watch-dog may situation be:
The 1st kind of situation, watch-dog cuts out shutter in the centre of each odd field;
The 2nd kind of situation, watch-dog cuts out shutter at the end of each odd field;
The 3rd kind of situation, watch-dog cuts out shutter in the centre of each even field;
The 4th kind of situation, watch-dog cuts out shutter at the end of each even field;
Closing at every turn and deducting in front of the door the time for exposure soon is the time point of at every turn opening shutter;
The 2.3rd step, according to that illumination control signal that can clear identification monitor video, judges and the identical shutter signal of this illumination control signal is the correct shutter signal of this watch-dog;
The 3rd step, described frequent flashing control equipment is according to the time point of the each opening and closing of shutter of watch-dog, according to the time point of the each opening and closing of shutter of watch-dog, controls the lighting apparatus opening and closing;
The shutter of watch-dog is opened at every turn and closes is a time for exposure section, and length is made as a; Lighting apparatus is opened at every turn and cuts out is a lighting hours section, the lighting hours segment length that comprises in each time for exposure section be made as b1, b2 ... bm, its mean value
The present invention can significantly reduce the energy consumption of lift car intraoral illumination equipment, extends the life-span of car intraoral illumination equipment, has guaranteed simultaneously the lighting demand of the interior watch-dog of lift car in various situations.
The accompanying drawing explanation
Fig. 1 is the structural representation of lift car stroboscopic illumination control system of the present invention;
Fig. 2 is two kinds of multi-form schematic diagrames of the field sync signal of video camera output;
Fig. 3 is a kind of schematic diagram of the shutter signal of video camera output;
Fig. 4 is the externally sequential schematic diagram of the shutter keying of field sync signal, parity field signal and the video camera of output of video camera;
Fig. 5 is the externally sequential schematic diagram of four kinds of possibility situations of the shutter keying of field sync signal, parity field signal and the video camera of output of video camera;
Fig. 6 is the illumination control signal of frequent flashing control equipment output of the present invention and the sequential schematic diagram of shutter signal.
The specific embodiment
Refer to Fig. 1, lift car stroboscopic illumination control system of the present invention (FFLCS, Frequency Flash Light Control Systems) comprising:
-lift car (car).
Lighting apparatus in-lift car (LF, Lighting Fixtures), specifically comprise again by the normal illumination equipment of mains supply and battery-powered emergency-lighting set.When the electrical network normal power supply, normal illumination opening of device, the battery charging (electric power storage) of emergency-lighting set.When grid cut-off, emergency-lighting set is opened and the battery-powered emergency lighting of remaining a period of time automatically.
Watch-dog in-lift car (camera), by cable, outwards export the monitor video signal in car, cable is connected to surveillance equipment or the memory device of Surveillance center, surveillance equipment can be watched the monitoring video information in car in real time, and memory device can record the monitoring video information in the storage car.The monitor video signal of watch-dog output comprises field sync signal and parity field signal at least, also may comprise shutter signal.
-frequent flashing control equipment (FFLCU, Frequency Flash Light Control Unit), connect described watch-dog and gather the monitor video signal of its output, also connects described lighting apparatus and control its opening and closing.
Described lighting apparatus is preferably the LED lamp, and the LED lamp not only has good illumination and energy-saving effect, and has advantages of that switching speed is fast, frequent switch.
Described watch-dog is preferably video camera, in the vision signal that any video camera is externally exported, all comprises field sync signal and parity field signal (Odd/Even Field Output), and some video camera externally vision signal of output also comprises shutter signal.
Refer to Fig. 2, difference according to the vision signal synchronizing separator circuit, the field sync signal that video camera is exported also can have various ways, such as being field synchronization output (Vertical SYNCOutput) or an output pulse (Vertical Output Pulse) etc., multi-form field sync signal all can be applicable to technical scheme of the present invention.
The vision signal of described frequent flashing control equipment collection is preferably the shutter signal of video camera output, inferior field sync signal and/or the parity field signal of electing video camera output as.
The control method of above-mentioned lift car stroboscopic illumination control system comprises the steps:
The 1st step, when lift car is in holding state, perhaps when lift car is in the watch-dog normal operation in off-position and lift car, described frequent flashing control equipment gathers the shutter signal of described watch-dog output, obtain the time point of the each opening and closing of shutter of watch-dog, enter the 3rd step.
Refer to Fig. 3, shutter signal is impulse form normally, as square-wave signal etc.; Its each rising edge or trailing edge namely represent the time point that the shutter of watch-dog is opened at every turn or closed.When the watch-dog in lift car was externally exported shutter signal, frequent flashing control equipment can directly gather this shutter signal, thereby obtained easily the time point of the each opening and closing of shutter of watch-dog.
The 2nd step, when watch-dog is not exported shutter signal, field sync signal and/or the parity field signal of described frequent flashing control equipment acquisition monitoring device output, if the manufacturer of watch-dog provides the sequential relationship of shutter signal and field sync signal (or parity field signal) at this moment, can determine shutter signal according to this sequential relationship, thereby obtain the time point of the each opening and closing of shutter of watch-dog.
Refer to Fig. 4, the external output field synchronizing signal of watch-dog (with the form of field output pulse signal), parity field signal etc., on the specification of watch-dog (PAL-system) record when shutter speed during greater than 1/100s (being 10ms) after each odd field starts the 10ms shutter close.Because time for exposure of watch-dog is predefined, be assumed to be 1/500s (being 2ms) this moment, can judge 8ms shutter opening after each odd field starts.The field sync signal that frequent flashing control equipment is exported by acquisition monitoring device, obtain the time that each field scan starts, and is for example that each rising edge of field sync signal is that field scan starts.The parity field signal that frequent flashing control equipment is exported by acquisition monitoring device again, learn that each is odd field or even field, when the low level of parity field signal, is for example odd field.Comprehensive two signals that gather, frequent flashing control equipment can be determined the time started of each odd field.Again according to the sequential relationship of known shutter keying and field sync signal and/or parity field signal, frequent flashing control equipment just can obtain the time point of the each opening and closing of shutter of watch-dog, for example each rising edge of shutter signal represents shutter opening, and each trailing edge represents shutter close.
If the manufacturer of watch-dog does not provide the sequential relationship of shutter signal and field sync signal (or parity field signal) at this moment, according to test, judge the time point of the each opening and closing of shutter of watch-dog.
The method that test is judged is as follows:
The 2.1st step, the time for exposure of setting watch-dog.The time for exposure of watch-dog in lift car, the longlyest can be set to equal 1 field duration, and namely the slowest shutter speed of PAL-system video camera is 1/50s, and the slowest shutter speed of TSC-system video camera is 1/60s.The shutter release frequency of watch-dog is generally equal to number of pictures per second, i.e. every output one two field picture of watch-dog, and shutter release once (carries out single exposure).
When the shutter speed of watch-dog during less than field duration of 1/2, be that PAL-system camera shutter speed is less than 1/100s, TSC-system camera shutter speed is less than 1/120s, and the sequential relationship of the shutter signal of watch-dog and field sync signal, parity field signal generally has four kinds of possibilities.Refer to Fig. 5, what suppose the field sync signal employing is a form of output pulse, and each rising edge represents the end of last field scan, and the beginning of new primary field scanning.The parity field signal represents odd field in each low level, at each high level, represents even field.Each rising edge of shutter signal represents shutter opening one time, and each trailing edge represents shutter close one time.The 1st kind of possible situation, video camera cuts out shutter in the centre of each odd field; The 2nd kind of possible situation, video camera cuts out shutter at the end of each odd field; The 3rd kind of possible situation, video camera cuts out shutter in the centre of each even field; The 4th kind of possible situation, video camera cuts out shutter at the end of each even field; These four kinds of possible situations are respectively as shown in the shutter signal 1,2,3,4 in Fig. 5.Before the time point of each shutter close, deduct the time point that the time for exposure is shutter opening.
The 2.2nd step, set respectively illumination control signal identical with four kinds of possible shutter signals, and namely the setting illumination control signal identical with shutter signal 1,2,3,4 in Fig. 5 respectively, observe the impact of these four kinds of illumination control signals on the monitor video definition.
Between above-mentioned four possible shutter signals, mutually do not occur simultaneously, in four corresponding illumination control signals, only have the shutter signal with reality identical, other three illumination control signals do not occur simultaneously fully with actual shutter signal.Therefore only having under an illumination control signal can clear identification monitor video, under other three illumination control signals, all is beyond recognition monitor video fully.
The 2.3rd step, according to that illumination control signal that can clear identification monitor video, judge with the identical shutter signal of this illumination control signal and be the correct shutter signal of this video camera, thereby obtain the time point of the each opening and closing of shutter of watch-dog.
The 3rd step, described frequent flashing control equipment, according to the time point of the each opening and closing of shutter of watch-dog, are controlled the lighting apparatus opening and closing.The principle that illumination is controlled is: the shutter of watch-dog is opened at every turn and closes is a time for exposure section, and length is made as a; Lighting apparatus is opened at every turn and cuts out is a lighting hours section, the lighting hours segment length that comprises in each time for exposure section be made as b1, b2 ... bm, its mean value
Min gets small function.One of them control program of preferably throwing light on is: b1=b2=...=bm.
Refer to Fig. 6, this is the schematic diagram of a shutter signal and illumination control signal.Each rising edge of illumination control signal wherein represents that lighting apparatus opens, and each trailing edge represents that a lighting apparatus cuts out.The control method 1-2 of the lift car stroboscopic illumination control system step according to the present invention, frequent flashing control equipment has obtained the shutter signal of watch-dog, i.e. the time point of the each opening and closing of shutter.Frequent flashing control equipment is controlled the lighting apparatus opening and closing accordingly.As shown in Figure 6, the each duration (being the time for exposure of watch-dog) of opening of shutter is normally constant, with a, represents.Lighting hours section in each time for exposure section be respectively b1, b2 ... bm, if require b1, b2 ... bm gets final product about equally.Specifically can be expressed as about equally
Wherein
Be b1, b2 ... the arithmetic average of bm.In fact work as b1=b2=... during bm, due to each time for exposure of watch-dog, obtain the illumination of equal length, so the monitoring video information that watch-dog is exported can clearly recognize, and the sense of picture flicker free.When b1, b2 ... when bm is slightly variant, for example
Perhaps better
Because each time for exposure of watch-dog obtains the illumination of length about equally, so the monitoring video information that watch-dog is exported can probably recognize, picture has flickering.When b1, b2 ... when bm has larger difference, for example exceeded
Restriction, because each time for exposure of watch-dog obtains the lighting hours that difference is larger, so the monitoring video information that watch-dog is exported almost is beyond recognition, picture has strong flickering.
Illumination control signal 1 in Fig. 6 just meets general embodiment of the present invention.On this basis, to provide some preferred embodiments as follows in the present invention:
The first preferred embodiment, as shown in the illumination control signal 2 in Fig. 6.Lighting apparatus follows the shutter of watch-dog and opens together, cuts out together.
The second preferred embodiment, as shown in the illumination control signal 3 in Fig. 6.Lighting apparatus is except the shutter of following watch-dog is opened together, closed together, also at the middle of every twice shutter opening time point, increase a lighting apparatus and open, also at the middle of every twice shutter close time point, increase a lighting apparatus and close.
Below the present invention is described in further detail with a specific embodiment.
In lift car, have video camera and the LED lamp of pal mode, video camera is not externally exported shutter signal.The time for exposure that presets video camera is 4ms, is equivalent to 1/5 of the field duration.The sequential relationship of the shutter keying of known video camera and field sync signal, parity field signal, field sync signal and/or the parity field signal exported by acquisition camera of stoboflash control, judge the time point that just can learn the each opening and closing of shutter by test so.
General illumination control program, stoboflash control are controlled the LED lamp and in the time for exposure of each video camera section (4ms), are had roughly the same lighting hours section (for example 2ms).In addition, for the context of switching frequency, LED lamp switch and the camera shutter switch of LED lamp, the unlatching duration of LED lamp, do not do any restriction.
The first preferred illumination control program, stoboflash control control LED lamp is followed shutter and is opened simultaneously, closes simultaneously.This moment, LED lamp per second opened and closed 25 times, and is identical with shutter keying frequency.The illumination duration of LED lamp in each frame is only 1/10 of frame length, so the power consumption of car intraoral illumination equipment 1/10 while becoming normal illumination.With an elevator average standby in a day 8 hours, the power of a car intraoral illumination equipment was 80W, and 233 degree can economize on electricity in 1 year with 1/10 Duty ratio control lighting apparatus.
The second preferred illumination control program, test are found, when the LED lamp opens and closes the frequency illumination of 25 times with per second, can cause visual excitement to human eye.For avoiding may existing in lift car personnel's situation, the shutter that the keying frequency of stoboflash control control LED lamp equals twice opens and closes frequency.Specifically, the LED lamp is opened simultaneously, closed simultaneously except following shutter, also at the middle of every twice unlatching of shutter time point, increase a LED lamp and open, also at the every middle time point of closing for twice of shutter, increase a LED lamp and close.LED lamp per second opens and closes 50 times like this, 1/5 the when power consumption of car intraoral illumination equipment becomes normal illumination, but taken into account human eye comfortableness visually.Still with an elevator average standby in a day 8 hours, the power of a car intraoral illumination equipment was 80W, and 186 degree can economize on electricity in 1 year with 1/5 Duty ratio control lighting apparatus.
Lift car stroboscopic illumination control system of the present invention and control method thereof, be not only applicable to lift car and be in holding state, is applicable to lift car yet and is in off-position.When lift car is in off-position, adopt illumination control program of the present invention, can realize that while making emergency lighting, the brightness of picture improves greatly under identical power consumption condition.
Lift car stroboscopic illumination control system of the present invention and control method thereof, can also be for carrying out for monitored picture the occasion of single frames parsing.It is that the face characteristic in monitored picture is recognized that single frames is resolved, the shutter speed of having relatively high expectations.Adopt illumination control program of the present invention, can for watch-dog, provide the illumination of high illumination, meet the higher shutter speed of watch-dog, can not cause sense of discomfort to the passenger again.
In sum, the present invention can be in guaranteeing lift car under the lighting demand prerequisite of watch-dog, improves the quality of watch-dog output picture, reduces the energy consumption of lift car intraoral illumination equipment, extend the life-span of car intraoral illumination equipment, the definition in the time of also can improving the parsing of monitored picture single frames.
Claims (4)
1. a lift car stroboscopic illumination control method, is characterized in that, in lift car, has lighting apparatus, watch-dog and frequent flashing control equipment; Described lighting apparatus comprises by the normal illumination equipment of mains supply and battery-powered emergency-lighting set; When grid cut-off, described emergency-lighting set is opened automatically; Described watch-dog is outwards exported the monitor video signal in car in real time by cable; Described frequent flashing control equipment connection watch-dog also gathers the monitor video signal of its output, also connects lighting apparatus and controls its unlatching, closes;
Described method comprises the steps:
The 1st step, when lift car is in holding state, perhaps when lift car is in off-position and the normal operation of watch-dog wherein, described frequent flashing control equipment gathers the shutter signal of described watch-dog output, obtain the time point of the each opening and closing of shutter of watch-dog, enter the 3rd step;
The 2nd step, when described watch-dog is not exported shutter signal, described frequent flashing control equipment gathers field sync signal and/or the parity field signal of described watch-dog output, the shutter of the watch-dog that provides according to manufacturer opens and closes with respect to the sequential relationship of field sync signal or parity field signal or according to test, obtains the time point of the each opening and closing of shutter of watch-dog;
The method of described test is:
The 2.1st step, the time for exposure of setting watch-dog;
The 2.2nd step, according to four kinds of the shutter signal of watch-dog may situations, set respectively the shutter signal identical illumination control signal possible with these four kinds, observe the impact of these four kinds of illumination control signals on the monitor video definition;
Four kinds of the shutter signal of described watch-dog may situation be:
The 1st kind of situation, watch-dog cuts out shutter in the centre of each odd field;
The 2nd kind of situation, watch-dog cuts out shutter at the end of each odd field;
The 3rd kind of situation, watch-dog cuts out shutter in the centre of each even field;
The 4th kind of situation, watch-dog cuts out shutter at the end of each even field;
Closing at every turn and deducting in front of the door the time for exposure soon is the time point of at every turn opening shutter;
The 2.3rd step, according to that illumination control signal that can clear identification monitor video, judges and the identical shutter signal of this illumination control signal is the correct shutter signal of this watch-dog;
The 3rd step, described frequent flashing control equipment, according to the time point of the each opening and closing of shutter of watch-dog, are controlled the lighting apparatus opening and closing;
The shutter of watch-dog is opened at every turn and closes is a time for exposure section, and length is made as a; Lighting apparatus is opened at every turn and cuts out is a lighting hours section, the lighting hours segment length that comprises in each time for exposure section be made as b1, b2 ... bm, its mean value
2. lift car stroboscopic illumination control method according to claim 1, is characterized in that, in described method the 2.1st step, the described time for exposure is less than or equal to the field duration of watch-dog.
3. lift car stroboscopic illumination control method according to claim 1, is characterized in that, in described method the 3rd step, the shutter that described frequent flashing control equipment control lighting apparatus is followed watch-dog is opened simultaneously, closed simultaneously.
4. lift car stroboscopic illumination control method according to claim 1, it is characterized in that, in described method the 3rd step, described frequent flashing control equipment is followed watch-dog except controlling lighting apparatus shutter is opened simultaneously, is closed simultaneously, also at the described lighting apparatus of the interlude point control of every twice shutter opening that is close to, open, described frequent flashing control equipment is also closed at the described lighting apparatus of interlude point control of every twice shutter close that is close to.
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