CN105245789B - A kind of strong Xanthophyll cycle method based on gradual change gray scale mirror - Google Patents
A kind of strong Xanthophyll cycle method based on gradual change gray scale mirror Download PDFInfo
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- CN105245789B CN105245789B CN201510657615.6A CN201510657615A CN105245789B CN 105245789 B CN105245789 B CN 105245789B CN 201510657615 A CN201510657615 A CN 201510657615A CN 105245789 B CN105245789 B CN 105245789B
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- change gray
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Abstract
The present invention provides a kind of gradual change gray scale mirror and the strong Xanthophyll cycle method based on gradual change gray scale mirror, and the light transmittance V (d) and (1-d/H) of the gradual change gray scale mirror are proportional；Wherein H indicates the height of gradual change gray scale mirror, and d indicates that, apart from gradual change gray scale Jing Xiabianyuanweizhichu height, V (d) indicates the light transmittance at gradual change gray scale mirror lower edge vertical range d.And inhibiting the method for strong light using the graduated filter is that the gradual change gray scale mirror is arranged in a filter switching device, when the vehicle headlight for monitoring to have movement in monitored picture, the gradual change gray scale mirror of filter switching device is switched in the optical path where camera lens and sensor.The problem of dazzle in monitored picture, ghost and image overexposure can be effectively suppressed in the present invention.Furthermore the light exposure that monitored picture entirety will not be reduced will not influence license plate candid photograph.
Description
Technical field
The present invention relates to field of video monitoring, in particular to a kind of gradual change gray scale mirror and a kind of strong light using the gray scale mirror
Suppressing method.
Background technique
In the application of video camera, when the vehicle headlight of distal end in monitored picture often generates very big shadow to monitored picture
It rings, the problem of various dazzles, ghost and image overexposure occurs in ratio, influences the actual photographed effect of monitored picture.
In order to avoid dazzle, ghost and image overexposure these problems, it will usually use following two ways: (1) supervise
It measures in monitored picture when there is vehicle headlight, reduces the entire light exposure of entire video camera；(2) go out in monitoring monitored picture
When existing vehicle headlight, the wide dynamic of optics is opened.
Mode (1), which reduces light exposure, can make the brightness of entire monitored picture while reduce, and be unfavorable in picture nearby
The identification of target, and it is also unobvious for the elimination of dazzle and ghost.
After mode (2) opens the wide dynamic of optics, the license plate of movement can fog, and be unfavorable for license plate candid photograph, while image
Effect can be deteriorated, and effective information possibly can not identify.
Summary of the invention
In view of this, the present invention provides a kind of gradual change gray scale mirror and the strong Xanthophyll cycle method based on gradual change gray scale mirror, it can
The problem of effective dazzle inhibited in monitored picture, ghost and image overexposure.Furthermore the exposure of monitored picture entirety will not be reduced
Amount will not influence license plate candid photograph.A kind of gradual change gray scale mirror of the disclosure of the invention, the light transmittance V (d) and (1-d/ of gradual change gray scale mirror
H) proportional；Wherein H indicates the height of gradual change gray scale mirror, and d is indicated apart from gradual change gray scale Jing Xiabianyuanweizhichu height, V
(d) light transmittance at gradual change gray scale mirror lower edge vertical range d is indicated.
Preferably, the formula of the light transmittance of the gradual change gray scale mirror is
V (d)=(1-d/H) * (P '/P) * 100%；
H indicates the height of gradual change gray scale mirror in formula, and d indicates that, apart from gradual change gray scale Jing Xiabianyuanweizhichu height, P is indicated
When light is through the optical power on unit area before gradual change gray scale mirror, P ' indicates light through the light on unit area after gradual change gray scale mirror
Power, V (d) indicate the light transmittance at gradual change gray scale mirror lower edge vertical range d.
Also disclose a kind of method for inhibiting strong light based on gradual change gray scale mirror, it is characterised in that: this method passes through in a filter
Gradual change gray scale mirror is set in mirror switching device, when the vehicle headlight for monitoring to have movement in monitored picture, by filter switching device
Gradual change gray scale mirror is switched in camera lens and optical path where sensor, when the vehicle headlight for not monitoring to have movement in monitored picture
When, switching filter switching device is not located at gradual change gray scale mirror in the optical path.
Preferably, the light transmittance V (d) of gradual change gray scale mirror and (1-d/H) are proportional；Wherein H indicates gradual change gray scale mirror
Height, d indicates apart from gradual change gray scale Jing Xiabianyuanweizhichu height, V (d) indicate apart from gradual change gray scale mirror lower edge vertically away from
From the light transmittance at d.
Preferably, the formula of the light transmittance of the gradual change gray scale mirror are as follows:
V (d)=(1-d/H) * (P '/P) * 100%
H indicates the height of gradual change gray scale mirror in formula, and d indicates that, apart from gradual change gray scale Jing Xiabianyuanweizhichu height, P is indicated
When light is through the optical power on unit area before gradual change gray scale mirror, P ' indicates light through the light on unit area after gradual change gray scale mirror
Power, V (d) indicate the light transmittance at gradual change gray scale mirror lower edge vertical range d.
Preferably, the filter switching device is located between the imaging sensor and camera lens in video camera
Preferably, the filter switching device is located at outside video camera, and is located in front of camera lens.
Preferably, the video camera is mounted on liftoff 3.5 meters -12 meters of height.
Preferably, the optical axis of the video camera and the angle of horizontal plane are installed at 40 ° -58 °.
Compared to the prior art, the gradual change gray scale mirror in the present invention has the gradual change distributed function that filters, and can inhibit and takes the photograph
Dazzle caused by distant place vehicle headlight and ghost problem in camera scene, while will not influence to the nearby candid photograph of license plate in scene.
Detailed description of the invention
Fig. 1 is that a kind of gradual change gray scale mirror of the invention is intended to；
Fig. 2 is a kind of gradual change gray scale mirror application example of the present invention；
Fig. 3 is setting and application schematic diagram of a kind of gradual change gray scale mirror of the present invention in video camera；
Fig. 4 is setting and application schematic diagram of another gradual change gray scale mirror of the invention in video camera；
Fig. 5 is the strong Xanthophyll cycle method flow diagram the present invention is based on gradual change gray scale mirror；
Fig. 6 is camera scene setting schematic diagram of the present invention.
Specific embodiment
The present invention provides a kind of gradual change gray scale mirror, the light transmittance V (d) of the gradual change gray scale mirror qualitatively with (1-d/H) at
Direct ratio.Wherein H indicates the height of gradual change gray scale mirror, and d is indicated apart from gradual change gray scale Jing Xiabianyuanweizhichu height, V (d) indicate away from
From the light transmittance at gradual change gray scale mirror lower edge vertical range d.That is the light transmittance of gradual change gray scale mirror upper rim is minimum, below
Edge light transmittance is maximum, specific as shown in Figure 1.
As preferred implementation, the formula of the light transmittance of gradual change gray scale mirror qualitatively can define are as follows: V (d)=(1-d/
H) * (P '/P) * 100%；
Specifically, in formula H indicate gradual change gray scale mirror height, d indicate apart from gradual change gray scale Jing Xiabianyuanweizhichu
Highly, P indicates that P ' indicates light through unit after gradual change gray scale mirror when light is through the optical power on unit area before gradual change gray scale mirror
Optical power on area, V (d) indicate the light transmittance at gradual change gray scale mirror lower edge vertical range d.Certainly in relation to V (d) and
Qualitative formula between (1-d/H) can not be above-mentioned formula, as long as meeting the proportional relationship of the two.For example, may be used also
Consider multiplied by constant parameter K related with filter material etc..
As a kind of specific implementation of gradual change gray scale mirror, which can be by real in lens surface plated film
Existing, the thickness of specific plated film is determined by V (d) formula.
As a kind of application to the gradual change gray scale mirror, inhibited the invention also provides a kind of using the gradual change gray scale mirror
The method that the strong light caused by the monitored picture nearby behaviors such as license plate candid photograph such as distant place vehicle headlight interferes in scene.
Specifically, in conjunction with Fig. 3 and Fig. 4 can be seen that video camera internal lens and imaging sensor (sensor) it
Between or video camera outside a filter switching device is set in front of camera lens.If being arranged filter switching device in camera lens
Front, for convenience of install, can be placed in the shield of video camera.The specific structure and realization principle of filter switching device
For the prior art, details are not described herein.
A gradual change gray scale mirror is set in the existing filter switching device of the present invention, realizes that the switching of gradual change gray scale mirror uses.
As the normal use of filter switching device, the scene filter that the also settable general scene of filter switching device uses specifically may be used
To be the combination of the one or more such as white slide, infrared filter and/or demisting filter.Certain filter switching device can also be only arranged
Gradual change gray scale mirror.Strong Xanthophyll cycle method of the invention is by way of intellectual monitoring, as shown in flow chart 5, when video camera is supervised
The vehicle headlight for having movement in monitored picture is measured, the gradual change gray scale mirror of filter switching device is switched to where camera lens and sensor
Optical path on, when video camera, which does not monitor, the vehicle headlight of movement in monitored picture, can by switch filter switching device make
Gradual change gray scale mirror is obtained not to be located in optical path.It is well known that in the case where night is bad, when observing lights of vehicle at a distance
It will appear dazzle and ghost phenomenon and can cause shooting image is excessively quick-fried etc. to influence the nearby behavior such as being captured license plate.Due to
The gradual change distributed function of gradual change gray scale mirror optical filtering, can make the big light of vehicle remotely located in the monitored picture taken obtain
To inhibition, and nearby the big light of vehicle will not obviously inhibit, and solve two kinds of the problems of the prior art that background technique is previously mentioned,
The problem of dazzle in monitored picture, ghost and image overexposure can be effectively suppressed.Furthermore the exposure of monitored picture entirety will not be reduced
Light quantity will not influence license plate candid photograph.Concrete example illustrates in combination with Fig. 2, it is assumed that a-quadrant is distance light area in Fig. 2, and B area is close
Light area is mainly determined the division in distance light area and dipped beam area by gradual change gray scale mirror transmitance formula.Point in two regions in certain figure
It is intended merely to more clearly to describe the problem every line and mark, can not have to mark in monitored picture again in actual use.Due to
Gradual change gray scale mirror becomes larger in the light penetration from a-quadrant to B area, thus in a-quadrant vehicle 1 vehicle headlight luminous energy
Inhibition is accessed, and the big light of vehicle of 2 vehicle 3 of vehicle will not obviously inhibit in B area.It therefore will not for the candid photograph of nearby license plate
Have an impact, and is able to suppress the excessively quick-fried problem of the big lamp wiring of distant place vehicle dazzle, ghost and image for caused by capturing license plate.
A-quadrant in Fig. 2 is also related with the position that video camera is installed with the division of B area.Specifically installed with video camera from
Ground height and camera light axis are related with the angle a of horizontal direction.Since video camera installs higher from the ground, then shooting picture
Visual field it is bigger, therefore distance light area proportion in entire monitored picture is bigger, and visual field is smaller if more close from the ground, far
Light area proportion in entire monitored picture is smaller.And the camera light axis and the angle a of horizontal direction the big, monitors picture
Distance light Qu Yue great in face, and distance light area is smaller in the smaller then monitored picture of angle a.In conjunction with Fig. 6, as a preferred implementation side
Formula video camera is mounted on terrain clearance within the scope of 3.5 meters -12 meters in video camera upright bar, and camera light axis and horizontal plane
Angle a it is more appropriate at 40 ° -58 °.The picture of practice of construction of being specifically subject to adjustment.
Gradual change gray scale mirror of the invention has the gradual change distributed function that filters, and it is big to can inhibit distant place vehicle in camera scene
Dazzle caused by lamp and ghost problem, while will not influence to the nearby candid photograph of license plate in scene.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.
Claims (6)
1. a kind of method for inhibiting strong light based on gradual change gray scale mirror, it is characterised in that: this method passes through in a filter switching device
Upper setting gradual change gray scale mirror, when the vehicle headlight for monitoring to have movement in monitored picture, by the gradual change gray scale mirror of filter switching device
Camera lens is switched to in the optical path where imaging sensor, when the vehicle headlight for not monitoring to have movement in monitored picture, is switched
Filter switching device is not located at gradual change gray scale mirror in the optical path；
The light transmittance V (d) and (1-d/H) of gradual change gray scale mirror are proportional；Wherein H indicates the height of gradual change gray scale mirror, and d is indicated
Apart from gradual change gray scale Jing Xiabianyuanweizhichu height, V (d) indicates the light transmission at gradual change gray scale mirror lower edge vertical range d
Rate.
2. the method according to claim 1 for inhibiting strong light based on gradual change gray scale mirror, which is characterized in that the gradual change ash
Spend the formula of the light transmittance of mirror are as follows:
V (d)=(1-d/H) * (P '/P) * 100%
H indicates the height of gradual change gray scale mirror in formula, and d indicates that, apart from gradual change gray scale Jing Xiabianyuanweizhichu height, light is worked as in P expression
Through the optical power on unit area before gradual change gray scale mirror, P ' indicates light through the light function on unit area after gradual change gray scale mirror
Rate, V (d) indicate the light transmittance at gradual change gray scale mirror lower edge vertical range d.
3. the method according to claim 1 for inhibiting strong light based on gradual change gray scale mirror, which is characterized in that the filter is cut
Changing device is located between the imaging sensor and camera lens in video camera.
4. the method according to claim 1 for inhibiting strong light based on gradual change gray scale mirror, which is characterized in that the filter is cut
Changing device is located at outside video camera, and is located in front of camera lens.
5. the method according to claim 3 or 4 for inhibiting strong light based on gradual change gray scale mirror, which is characterized in that described takes the photograph
Camera is mounted on liftoff 3.5 meters -12 meters of height.
6. the method according to claim 3 or 4 for inhibiting strong light based on gradual change gray scale mirror, which is characterized in that the camera shooting
The optical axis of machine and the angle of horizontal plane are at 40 ° -58 °.
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| CN201510657615.6A CN105245789B (en) | 2015-10-13 | 2015-10-13 | A kind of strong Xanthophyll cycle method based on gradual change gray scale mirror |
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| CN201510657615.6A CN105245789B (en) | 2015-10-13 | 2015-10-13 | A kind of strong Xanthophyll cycle method based on gradual change gray scale mirror |
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| CN105245789B true CN105245789B (en) | 2019-10-18 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106454040A (en) * | 2016-10-21 | 2017-02-22 | 东风商用车有限公司 | Night anti-dazzle vehicular camera and control method thereof |
| WO2019052090A1 (en) * | 2017-09-18 | 2019-03-21 | 江门市卡色光学有限公司 | Reinforced toughened filter, graduated neutral-density filter plating device and plating method therefor |
| CN107590792B (en) * | 2017-09-30 | 2020-09-01 | 努比亚技术有限公司 | Method, apparatus and computer-readable storage medium for presenting GND filter boundary |
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| CN201314982Y (en) * | 2008-11-20 | 2009-09-23 | 镇江万新光学眼镜有限公司 | Polaroid glasses manufactured from gradient polarized lenses |
| CN102795083A (en) * | 2012-08-02 | 2012-11-28 | 关献文 | Night-driving light-avoiding device for motor vehicles |
| CN203414661U (en) * | 2013-08-05 | 2014-01-29 | 杭州海康威视数字技术股份有限公司 | Optical filter inhibiting local excessive exposure |
| CN103909868A (en) * | 2013-01-04 | 2014-07-09 | 常州雅谱智能变色光学器件有限公司 | Front-view intelligent anti-glare device of vehicle and manufacturing method of anti-glare mirror thereof |
| CN203840423U (en) * | 2014-04-04 | 2014-09-17 | 温州市绿洲电子科技有限公司 | Differentiation photosensitive digital shooting device used in security or intelligent traffic field |
| CN204506438U (en) * | 2015-03-26 | 2015-07-29 | 谭红光 | Vehicle polarisation gradual change sun mirror solar protection devices |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201314982Y (en) * | 2008-11-20 | 2009-09-23 | 镇江万新光学眼镜有限公司 | Polaroid glasses manufactured from gradient polarized lenses |
| CN102795083A (en) * | 2012-08-02 | 2012-11-28 | 关献文 | Night-driving light-avoiding device for motor vehicles |
| CN103909868A (en) * | 2013-01-04 | 2014-07-09 | 常州雅谱智能变色光学器件有限公司 | Front-view intelligent anti-glare device of vehicle and manufacturing method of anti-glare mirror thereof |
| CN203414661U (en) * | 2013-08-05 | 2014-01-29 | 杭州海康威视数字技术股份有限公司 | Optical filter inhibiting local excessive exposure |
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| CN204506438U (en) * | 2015-03-26 | 2015-07-29 | 谭红光 | Vehicle polarisation gradual change sun mirror solar protection devices |
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