CN103723004A - Anti-dazzling driving auxiliary system based on liquid crystal glass and anti-dazzling method of anti-dazzling driving auxiliary system - Google Patents
Anti-dazzling driving auxiliary system based on liquid crystal glass and anti-dazzling method of anti-dazzling driving auxiliary system Download PDFInfo
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Abstract
The invention discloses an anti-dazzling driving auxiliary system based on liquid crystal glass. The anti-dazzling driving auxiliary system comprises a liquid crystal glass unit, a light source sensing unit and a data processing and controlling unit. The liquid crystal glass unit comprises dot-matrix liquid crystal glass and a driving component, and the driving component is used for changing the light transmittance of all dot matrixes of the dot-matrix liquid crystal glass according to the dot-matrix state information of the data processing and controlling unit. The invention further discloses an anti-dazzling method of the anti-dazzling driving auxiliary system based on the liquid crystal glass. Regional shading is carried out through the dot-matrix liquid crystal glass, the reaction to hard light of the eyes of a driver can be relieved, the effect of hard light irradiation on driver driving is relieved, and meanwhile the illumination to other parts of a road is relatively not affected.
Description
Technical field
The invention belongs to vehicle no-glare technical field, especially relate to a kind of no-glare drive assist system and anti-dazzle method thereof based on liquid-crystalline glasses.
Background technology
In Vehicle Driving Cycle process, because the eyes of chaufeur are often subject to strong sunlight and the stimulation of the headlight of the vehicle that head-on travels, cause chaufeur to produce and dazzle the eyes sensation, affect pilot's line of vision, easily cause traffic accident.For this type of situation, the way of wearing helioscope when some drivers take at windscreen attaching solar film on glass or drive at present reduces the stimulation to eye.Yet this class methods integral body has weakened incident intensity, environment incident intensity weakens too.Due to the strongly-adaptive of human eye, the corresponding amplification of pupil meeting, the stimulation of car light high light is corresponding bounce-back also.In addition, by ad-hoc location on car front glass, mount variable light transmittance liquid-crystalline glasses, by detecting incident illumination, change liquid-crystalline glasses light transmittance.When reducing the relative driver's luminous intensity of country beam, integral body has weakened the light transmission of glass for vehicle window, on driving, produces new impact.
Existing technical solution is mainly found solution route from car light, as reflective floodlight car light.Have at present representative SmartBeam intelligence long-and-short distant light control system.Yet, these cover system no-glare means are to change in real time the Lighting System of country beam, for driver, Active Performance is not strong, and the change of Lighting System is meaned to the loss of road illumination, consider the particularity of diaphragm system, cannot effectively observe the steering vehicle on road, may cause new hidden danger to driving.
Summary of the invention
The present invention affects the defect in the driving visual field of chaufeur when overcoming shading in prior art, has proposed a kind of no-glare drive assist system based on liquid-crystalline glasses.The present invention, by automobile front wind glass is transformed, uses the liquid-crystalline glasses of dot matrix, by miniature control unit, is controlled.This miniature control unit is learned the relevant information of intense light source simultaneously by photosensitive Fu or imageing sensor.Liquid-crystalline glasses dot matrix between high light and chaufeur eye is changed to current potential and make its shading, can alleviate the reaction of chaufeur eye to high light, and then slow down the impact of strong illumination on driver drives vehicle, have stronger shading initiative, the illumination of road remainder does not produce any impact relatively simultaneously.
The present invention proposes a kind of no-glare drive assist system based on liquid-crystalline glasses, comprising:
Liquid-crystalline glasses unit, the driving visual field of covering chaufeur;
Light source perception unit, for gathering the information of the light that the driving visual field that described liquid-crystalline glasses unit covers is subject to;
Data processing and control unit, by receiving and process described information, change the dot matrix status information of described liquid-crystalline glasses unit;
Described liquid-crystalline glasses unit comprises lattice liquid crystal glass and drive element, changes the light transmittance of each dot matrix of described lattice liquid crystal glass by described drive element according to the dot matrix status information of described data processing and control unit.
Wherein, described light source perception unit comprises imageing sensor; The light information of described light source perception unit collection comprises azimuth information, strength information and chrominance information.
Wherein, the collection direction of described light source perception unit is identical with direction of traffic; Described light source perception unit is arranged on outside the coverage of described liquid-crystalline glasses unit.
Wherein, described data processing and control unit are analyzed the information of described light source perception unit collection, determine the dot matrix status information of described liquid-crystalline glasses unit, export described liquid-crystalline glasses unit to.
Wherein, described dot matrix state packets of information is drawn together the half-tone information of each dot matrix of lattice liquid crystal glass.
The anti-dazzle method that the invention allows for a kind of no-glare drive assist system based on liquid-crystalline glasses, comprises the steps:
Step 1: open the described no-glare drive assist system based on liquid-crystalline glasses, described data processing and control unit initialization;
Step 2: described light source perception unit gathers driver drives vehicle field-of-view image and is sent to described data processing and control unit; The detection to each orientation strength information of service area in image and chrominance information of described data processing and control unit, judges in driver's seat, whether there is intense light source; If there is intense light source, described data processing and control unit obtain the information of intense light source;
Step 3: described data processing and control unit, according to the information of parameter preset and described intense light source, determine the dot matrix status information of described liquid-crystalline glasses unit, export described liquid-crystalline glasses unit to;
Step 4: described liquid-crystalline glasses unit, according to the described dot matrix status information from data processing and control unit reception, changes the light transmittance of dot lcd glass respective points battle array, to realize the object of blocking high light for chaufeur.
Wherein, further comprise step 5: repeated execution of steps two is to step 4, when described data processing and control unit receive abort commands, power cut-off.
Wherein, further comprise: after the parameter preset in revising described data processing and control unit, the described no-glare drive assist system based on liquid-crystalline glasses resets automatically.
Wherein, described parameter preset comprises the relative position information of chaufeur eye and described liquid-crystalline glasses unit, the decision condition of described light source perception unit to intense light source.
The present invention can carry out accurate shading by enough liquid-crystalline glasses, can play good shaded effect.Empirical tests test, after shading, incident intensity be only before below 33%.
The present invention adopts lattice liquid crystal glass to carry out region shading, can alleviate the reaction of chaufeur eye to high light, and then slows down the impact of strong illumination on driver drives vehicle, and the illumination of road remainder does not produce any impact relatively simultaneously.
Module making of the present invention is with low cost, and material is very universal, for example cmos image sensor.
Three part of module of the present invention all can be installed in interior space and be easy to existing vehicle refitting.The present invention is without vehicle interior structure is transformed in a large number, and system can adopt the ready-made Power supply of vehicle.
The technical requirements of demand of the present invention is relatively low, and hardware component of the present invention all can adopt current material to realize.The treater that data processing of the present invention and control module only need adopt main flow just can, and the programming development of data processing and control unit is also relatively easy.
The present invention is less to the negative effect of night driving.The present invention adopts lattice liquid crystal glass to carry out region shading, only intense light source is carried out to the weakening of actv. light to the high light of human eye direction, can alleviate the reaction of chaufeur eye to high light, and then slowing down the impact of strong illumination on driver drives vehicle, the illumination of road remainder does not produce any impact relatively simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention is based on the no-glare drive assist system of liquid-crystalline glasses.
Fig. 2 is the diagram of circuit that the present invention is based on the no-glare drive assist system anti-dazzle method of liquid-crystalline glasses.
The light transmittance that Fig. 3 is is with variation and the graph of a relation to the scattering situation of each wavelength light of voltage.Wherein, Fig. 3 (B) is that PDLC light transmittance is with the variation relation figure of voltage; Fig. 3 (A) is the graph of a relation of PDLC to the scattering situation of each wavelength light.
Fig. 4 is the schematic diagram of data processing and control unit computation model.Wherein, Fig. 4 (A) is the computation model of horizontal direction parameter; Fig. 4 (B) is the computation model of vertical direction parameter.
Fig. 5 is the schematic diagram of data processing and control unit computation model.Wherein, Fig. 5 (A) is the computation model of horizontal direction parameter; Fig. 5 (B) is the computation model of vertical direction parameter.
Fig. 6 is the light intensity comparison diagram that image acquisition device is subject to before and after the present invention processes.
The specific embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail.Implement process of the present invention, condition, experimental technique etc., except the content of mentioning specially below, be universal knowledege and the common practise of this area, the present invention is not particularly limited content.
1-liquid-crystalline glasses unit, 2-light source perception unit, 3-data processing and control unit.
As shown in Figure 1, the present invention is based on the no-glare drive assist system of liquid-crystalline glasses, comprising: liquid-crystalline glasses unit 1, light source perception unit 2, data processing and control unit 3.
Liquid-crystalline glasses unit 1 comprises lattice liquid crystal glass and drive element.In concrete application, drive element can be driving circuit.Drive element changes the light transmittance of the each point of lattice liquid crystal glass according to the control signal input of data processing and control unit 3 by driving circuit.Liquid-crystalline glasses adopts PDLC (polymer dispersed liquid crystal) PDLC glass.
PDLC liquid-crystalline glasses principle of work: PDLC, under the situation without external voltage, intermembranously can not form regular electric field, and the direction of optic axis of liquid crystal particle is random, presents disordered state, its effective refractive index not with the index matching of poly-mer.Incident ray is by strong scattering, and it is opaque or translucent that film is.Applying under the situation of external voltage, the optical axis of liquid crystal particle is arranged perpendicular to film surface, consistent with direction of an electric field.The ordinary refraction index of liquid crystal particle mates substantially with the ratio of refraction of poly-mer, without obvious interface, has formed a basic medium uniformly, so incident light scattering can not occur, film is transparence.Therefore,, under the driving of extra electric field, PDLC possesses switch feature.As shown in Figure 3, the light transmittance of general PDLC changes 0%～85%, in visible-range, shaded effect is all very excellent, its light transmittance-change of voltage curve is ideal, threshold range is little, and change slope simultaneously, be unlikely to excessive, good gray-scale Control prospect is provided, for accurately determining that the shading operation possibility of amount provides Maximum Space.PDLC liquid-crystalline glasses device is large to the variation range of light penetration, this be its in nature and important advantage.Liquid-crystalline glasses can be arranged on Windshield, covers most of sight line of chaufeur, also can select large-scale liquid-crystalline glasses as Windshield.
In the present embodiment, light source perception unit 2 adopts common cmos image sensor, be connected with control unit 3 with data processing, imageing sensor be placed in to a side of the liquid-crystalline glasses of liquid-crystalline glasses unit 1, liquid-crystalline glasses panel plane vertical line is parallel with cam lens axis.Light source perception unit 2 gathers the driver drives vehicle visual field (seeing through lattice liquid crystal glass) graphicinformation and transfers to data processing and control unit 3.Data processing and control unit 3 are analyzed the optical information that is subject to of driver's seat.Be subject to azimuth information, strength information and the chrominance information of the high light that optical information comprises.The collection direction identical with direction of traffic (driver's seat direction) of light source perception unit 2; The installation site of light source perception unit 2 makes its acquisition range not be subject to blocking of liquid-crystalline glasses unit 1.
In data processing and control unit 3, be provided with parameter preset.Parameter preset is for analyzing the graphicinformation of light source perception unit 2, data processing and control unit 3 determine the corresponding dot matrix state of liquid-crystalline glasses unit 1, corresponding control signal exports liquid-crystalline glasses unit 1 to, the liquid-crystalline glasses respective regions light transmittance of liquid-crystalline glasses unit 1 changes, realize the irradiation that alleviates high light for driver, avoid again the impact on driving simultaneously as far as possible.
As shown in Figure 2, the anti-dazzle method of the no-glare drive assist system based on liquid-crystalline glasses of the present invention, comprising:
Step 1: open the no-glare drive assist system based on liquid-crystalline glasses, data processing and control unit 3 initialization;
Step 2: light source perception unit 2 gathers driver drives vehicle field-of-view image and is sent to data processing and control unit 3; The detection of each orientation strength information of service area and chrominance information in 3 pairs of images of data processing and control unit, judges in driver's seat, whether there is intense light source; If there is intense light source, data processing and control unit 3 obtain the information of intense light source;
Step 3: data processing and control unit 3, according to the information of parameter preset and intense light source, determine the dot matrix status information of liquid-crystalline glasses unit 1, export liquid-crystalline glasses unit 1 to;
Step 4: liquid-crystalline glasses unit 1, according to the dot matrix status information from data processing and control unit 3 receptions, changes the light transmittance of dot lcd glass respective points battle array, to realize the object of blocking high light for chaufeur.
Wherein, further comprise step 5: repeated execution of steps two is to step 4, when data processing and control unit 3 receive abort commands, finish.
Wherein, further comprise: after the parameter preset in Update Table processing and control unit 3, the no-glare drive assist system based on liquid-crystalline glasses resets automatically.
Wherein, parameter preset comprises the decision condition of intense light source in the driver's seat image that relative position information, data processing and 3 pairs of light source perception unit 2 of control unit of chaufeur eye and liquid-crystalline glasses unit 1 gather.The decision condition of high light mainly comprises strength range and the chromaticity range of high light, and the intensity of light judges that higher than this scope and colourity this light light source is intense light source within the scope of this.
Embodiment:
Chaufeur is opened no-glare drive assist system of the present invention when night running, and data processing and control unit 3 carry out initialization and load parameter preset.Initialization comprises the os starting process that data processing and control unit carry, and before native system starts normal work the dead work of program, make light source perception unit 2, liquid-crystalline glasses unit 1 enter the steps necessary etc. of mode of operation.Parameter preset comprises: chaufeur eye and the relative position information of liquid-crystalline glasses unit 1 are, region (service area) pixel coordinate in the image that the driver's seat that the decision condition of high light, strength range and chromaticity range, liquid-crystalline glasses cover gathers in light source perception unit 2.
Light source perception unit 2 starts to gather driver drives vehicle field-of-view image and is sent to data processing and control unit 3.According to the detection of each orientation strength information of service area and chrominance information in data processing and 3 pairs of images of control unit, judge in driver's seat, whether there is intense light source.
In data processing and the control unit 3 judgement driver drives vehicle visuals field, there is intense light source, data processing and control unit 3 are according to the relative position of chaufeur eyeball in the azimuth information of intense light source and parameter preset and lattice liquid crystal glass, calculate the lattice position that this light source appears at dot lcd place on glass, and according to the intensity of intense light source for information about, calculate the output gray level of the liquid-crystalline glasses that stops that this intense light source is required, thereby can make intense light source irradiation chaufeur intensity effectively die down with this gray scale output, reduce this light source for the stimulation of Driver Vision.Data processing and control unit 3 are according to the liquid-crystalline glasses dot matrix each point output information calculating, control the dot matrix each point output of liquid-crystalline glasses unit 1, by reducing the light transmittance in liquid crystal dot matrix glass orientation, intense light source place in driver's seat, reduced the dazzling effect of intense light source for chaufeur.
Data processing and the computation model of control unit 3 in step 3 for example under:
Intense light source in point by point scanning detected image: in this model, human eye is approximately a bit, relative intense light source and human eye distance, human eye and light source perception unit 2 cameras distances are ignored, and therefore, by image approximate that camera gathers, are driver's seat.
For example, known human eye and dot matrix screen distance are A, shield wide L, and high H, vertically places, and the projection of human eye on screen, apart from the high B in screen bottom, is C apart from screen left end, shields for vertically just putting, as shown in Figure 4.Above-mentioned each distance parameter before use can actual measurement, and the parameter preset input during as system initialization.
α, β are respectively LOOK LEFT and the LOOK RIGHT of human eye E, and wherein, LOOK LEFT and LOOK RIGHT represent suc as formula (I):
Can in perpendicular, establish upward angle of visibility and downwards angle of visibility that δ, θ are human eye E equally, upward angle of visibility and downwards angle of visibility represent suc as formula (II):
The visual angle of imageing sensor is enough large, and visual angle, left and right is φ, and upper downwards angle of visibility is that ω is φ > α, φ > β, ω > δ, ω > θ.
The valid pixel 2x2y of imageing sensor, all pixels of imageing sensor are all gone up in the focal plane of lens (being also CCD/CMOS lattice plane), and optical center of lens is O.If a, b, c, d, a, b, c, d are that the corresponding region edge of liquid-crystalline glasses coverage on lattice plane is far from the distance at center, as shown in Figure 5.
Following geometric relationship as shown in Figure 5, represents suc as formula (III):
Only need make (x-a) row in data processing and control unit 3 detected image sensors be listed as to (x+b), the pixel in the interval that (y-d) row is gone to (y+c).
For example, light source coordinate in imageing sensor, detected for (m, n), n row from left to right, a lower m is capable, and light source is in above-mentioned interval, and the pixel of liquid crystal dot matrix is pq, and in liquid crystal dot matrix, the corresponding coordinate of chopping point represents suc as formula (IV):
In formula (IV), p, q, x, y is systemic presupposition parameter.
If not the result integer of the corresponding coordinate of chopping point, does the approximate processing that rounds by data processing and 3 pairs of these results of control unit.
Data processing and control unit 3 being calculated as follows the judgement of intense light source and half-tone information in step 3:
The point source of light intensity receiving when human eye is environmental light intensity K times time, and now human eye just starts not feel well, and claims that K is the human eye comfort limit of this environmental light intensity.
When human eye sees through environmental light intensity and the point source of light light intensity that liquid-crystalline glasses is seen, imageing sensor image mid point (X, Y) light intensity C ' surpasses human eye comfort limit K with the ratio of environmental light intensity C, and is M times of environmental light intensity, i.e. C '=MC.
Data processing of the present invention and control unit 3 are judged after intense light source, according to the light intensity of intense light source, determine the gray scale on the corresponding dot matrix of liquid-crystalline glasses.When liquid-crystalline glasses ash exponent number is n, have:
(N gets approximate integer, and N is not 0).The drive element of liquid-crystalline glasses unit 1 is according to the state of the output control lattice liquid crystal glass of data processing and control unit 3, light after dot lcd glass treatment, the light intensity decreasing of intense light source and environment, contrast ratio also reduces relatively.The intense light source intensity C that human eye is seen " reached human eye comfort limit, realized abblendbar function, as shown in Figure 6.
For example, liquid-crystalline glasses is 16 GTGs, and gray scale is within 0 o'clock, to be white, and during gray scale 15, for entirely black, the gray scale of liquid-crystalline glasses unit 1 output is N, thereby has:
(N gets approximate integer, and N is not 0).
Consideration is all the road at night in actual application, thereby ambient light illumination difference little, and human eye has strongly-adaptive, also K can be regarded as normal value, but not the function of environmental light intensity C calculates thereby simplify.
The light intensity value of hot spot can be calculated by the rgb value of this point, also can the Y value in YUV value directly obtain.
By obtaining the rgb value of hot spot, can calculating, judge that high light colourity is whether within colourity judgement scope, whether judgement for example this high light belongs to country beam white light, or be the red tail-light of front vehicles, and traffic lights, etc., colourful signal lamp is not judged as to intense light source.
When chaufeur stops driving or when not needing to open no-glare DAS (Driver Assistant System), chaufeur sends suspended market orders by data processing and control unit 3, and no-glare DAS (Driver Assistant System) of the present invention can (stopping step 2 to the circulation of step 4) out of service.The state that intense light source do not detected in the state of the lattice liquid crystal glass of liquid-crystalline glasses unit 1 and system operation and driver's seat is roughly the same, and the lattice liquid crystal glass that data processing and control unit 3 are controlled liquid-crystalline glasses unit 1 by drive element is penetrating state.
If when there is change or having error in the position of chaufeur eyeball and the relative position of lattice liquid crystal glass, can Update Table process with control unit 3 in parameter preset adjust.When the decision condition of the same high light blocking for need according to different situations is modified, can Update Table processing adjust with the parameter preset in control unit 3.At the initial phase of system, user can select whether to revise parameter preset, if select, revises, and enters and revises parameter preset interface, if select, does not revise, and continues the initialize process of actuating system.
Protection content of the present invention is not limited to above embodiment, is not deviating under the spirit and scope of inventive concept, and variation and advantage that those skilled in the art can expect are all included in the present invention, and take appending claims as protection domain.
Claims (9)
1. the no-glare drive assist system based on liquid-crystalline glasses, is characterized in that, comprising:
Liquid-crystalline glasses unit (1), the driving visual field of covering chaufeur;
Light source perception unit (2), for gathering the information of the light that the driving visual field that described liquid-crystalline glasses unit (1) covers is subject to;
Data processing and control unit (3), by receiving and process described information, change the dot matrix status information of described liquid-crystalline glasses unit (1);
Described liquid-crystalline glasses unit (1) comprises lattice liquid crystal glass and drive element, changes the light transmittance of each dot matrix of described lattice liquid crystal glass by described drive element according to the dot matrix status information of described data processing and control unit (3).
2. the no-glare drive assist system based on liquid-crystalline glasses as claimed in claim 1, is characterized in that, described light source perception unit (2) comprises imageing sensor; The light information that described light source perception unit (2) gathers comprises azimuth information, strength information and chrominance information.
3. the no-glare drive assist system based on liquid-crystalline glasses as claimed in claim 1, is characterized in that, the collection direction of described light source perception unit (2) is identical with direction of traffic; Described light source perception unit (2) is arranged on outside the coverage of described liquid-crystalline glasses unit (1).
4. the no-glare drive assist system based on liquid-crystalline glasses as claimed in claim 1, it is characterized in that, the information that described data processing and control unit (3) gather described light source perception unit (2) is analyzed, determine the dot matrix status information of described liquid-crystalline glasses unit (1), export described liquid-crystalline glasses unit (1) to.
5. the no-glare drive assist system based on liquid-crystalline glasses as claimed in claim 4, is characterized in that, described dot matrix state packets of information is drawn together the half-tone information of each dot matrix of lattice liquid crystal glass.
6. an anti-dazzle method for the no-glare drive assist system based on liquid-crystalline glasses, is characterized in that, comprises the steps:
Step 1: open the described no-glare drive assist system based on liquid-crystalline glasses, described data processing and control unit (3) initialization;
Step 2: described light source perception unit (2) gathers driver drives vehicle field-of-view image and is sent to described data processing and control unit (3); Described data processing and control unit (3) detection to each orientation strength information of service area in image and chrominance information, judges in driver's seat, whether there is intense light source; If there is intense light source, described data processing and control unit (3) obtain the information of intense light source;
Step 3: described data processing and control unit (3), according to the information of parameter preset and described intense light source, determine the dot matrix status information of described liquid-crystalline glasses unit (1), export described liquid-crystalline glasses unit (1) to;
Step 4: described liquid-crystalline glasses unit (1), according to the described dot matrix status information from data processing and control unit (3) reception, changes the light transmittance of dot lcd glass respective points battle array, to realize the object of blocking high light for chaufeur.
7. the anti-dazzle method of the no-glare drive assist system based on liquid-crystalline glasses as claimed in claim 6, it is characterized in that, further comprise step 5: repeated execution of steps two is to step 4, when described data processing and control unit (3) receive abort commands, power cut-off.
8. the anti-dazzle method of the no-glare drive assist system based on liquid-crystalline glasses as claimed in claim 6, it is characterized in that, further comprise: after the parameter preset in revising described data processing and control unit (3), the described no-glare drive assist system based on liquid-crystalline glasses resets automatically.
9. the anti-dazzle method of the no-glare drive assist system based on liquid-crystalline glasses as claimed in claim 6, it is characterized in that, described parameter preset comprises relative position information, the decision condition of described light source perception unit (2) to intense light source of chaufeur eye and described liquid-crystalline glasses unit (1).
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Application publication date: 20140416 |