CN110430643B - Method and device for controlling uniformity of automobile light - Google Patents
Method and device for controlling uniformity of automobile light Download PDFInfo
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- CN110430643B CN110430643B CN201910703001.5A CN201910703001A CN110430643B CN 110430643 B CN110430643 B CN 110430643B CN 201910703001 A CN201910703001 A CN 201910703001A CN 110430643 B CN110430643 B CN 110430643B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
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Abstract
The invention provides a method and a device for controlling the uniformity of automobile light, wherein the method comprises the following steps: step 1, obtaining a target value of the brightness uniformity of an automobile lamp; step 2, judging whether the car light is turned on, if so, acquiring a front road image, and if not, continuously judging whether the headlight is turned on; step 3, identifying the road image to obtain a preset detection area; step 4, dividing the preset detection area into a plurality of detection subareas; step 5, determining the brightness polarity of each detection subarea; step 6, controlling the deflection of the car lamp according to the brightness polarity of each detection subarea; and 7, judging whether the brightness uniformity of the automobile lamp after the automobile lamp is deflected meets a target value, if so, returning to the step 1, and otherwise, returning to the step 6. The invention realizes the automatic control of the uniformity of the automobile light.
Description
Technical Field
The invention relates to the technical field of vehicle lamp control, in particular to a method and a device for controlling the uniformity of vehicle light.
Background
After a driver turns on a lamp switch at night, a visible visual field is formed on the road surface. When the light of the existing automobile headlamp irradiates the road surface, the road surface corresponding to the central axis of the left headlamp and the right headlamp and the road surface corresponding to the central axis of the automobile have uneven brightness. Because the light of the car lamp has a very obvious beam cut-off line, the light in the area in front of the beam cut-off line is bright, and objects can be clearly distinguished, and the area range behind the beam cut-off line is mainly formed by a reflected light source of a road surface. Most of current vehicle types have the uneven problem of luminance in the region in front of the light beam cutoff line.
Disclosure of Invention
The invention provides a method and a device for controlling the uniformity of automobile light, aiming at overcoming the defects in the prior art and realizing the automatic control of the uniformity of the automobile light.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a method for controlling the uniformity of automobile light, which comprises the following steps:
step 1, obtaining a target value of the brightness uniformity of an automobile lamp;
step 2, judging whether the car light is turned on, if so, acquiring a front road image, and if not, continuously judging whether the headlight is turned on;
step 3, identifying the road image to obtain a preset detection area;
step 4, dividing the preset detection area into a plurality of detection subareas;
step 5, determining the brightness polarity of each detection subarea;
step 6, controlling the deflection of the car lamp according to the brightness polarity of each detection subarea;
and 7, judging whether the brightness uniformity of the automobile lamp after the automobile lamp is deflected meets a target value, if so, returning to the step 1, and otherwise, returning to the step 6.
Specifically, the step of acquiring the preset detection area includes:
step 301, determining a cut-off line of a vehicle lamp beam;
step 302, identifying whether lane lines exist on the left side and the right side of the vehicle, if so, taking the lane lines as left and right boundaries, otherwise, taking road shoulders on the left side and the right side of the vehicle as left and right boundaries of the preset detection area;
step 303, acquiring an initial rear boundary line, wherein the initial rear boundary line is a line segment which is parallel to the cut-off line and is tangent to the front edge of the vehicle;
step 304, acquiring the cutoff line and the maximum brightness values of all pixels in the range of the initial back boundary;
and 305, taking the upper and lower boundaries of the region meeting the clipping brightness value as the upper and lower boundaries of the preset detection region.
Specifically, the clipping luminance value L0 ═ k × Lmax, k being a scaling factor.
Specifically, the step 4 includes:
step 401, dividing the preset detection area into a left detection sub area and a right detection sub area by taking an extension line of a central shaft of the vehicle as a central line;
step 402, taking a central extension line of a left vehicle lamp as a central line, equally dividing the left detection sub-region into an upper left detection sub-region and a lower left detection sub-region, and taking a central extension line of a right vehicle lamp as a central line, equally dividing the right detection sub-region into an upper right detection sub-region and a lower right detection sub-region;
and 403, equally dividing the upper left detection sub-region, the lower left detection sub-region, the upper right detection sub-region and the lower right detection sub-region.
Specifically, the step 5 includes:
step 501, obtaining the average pixel brightness of the preset detection area;
step 502, obtaining the pixel average brightness of each detection sub-region;
step 503, calculating a difference value between the average pixel brightness of the preset detection region and the average pixel brightness of each detection sub-region, and determining the brightness polarity of each detection sub-region according to the difference value.
Specifically, the determining the brightness polarity of each of the detection sub-regions according to the difference value includes: and if the difference is greater than 0, determining that the brightness polarity is positive, if the difference is less than 0, determining that the brightness polarity is negative, and if the difference is equal to 0, determining that the brightness polarity is not present.
Specifically, the step 6 includes:
when the brightness polarity of the detection subarea is positive, the driving motor outputs a high-level control signal to enable the car light to deflect anticlockwise;
when the brightness polarity of the detection subarea is negative brightness polarity, the driving motor outputs a low-level control signal to enable the car lamp to deflect clockwise;
and when the brightness polarity of the detection sub-region is the non-brightness polarity, the driving motor does not output the control signal.
The invention provides a device for controlling the uniformity of automobile light, which comprises a setting module, a lamp signal acquisition module, an image processing module, a uniformity judgment module and a motor module, wherein the setting module is used for setting the uniformity of the automobile light; the automobile lamp signal acquisition module, the image processing module, the uniformity judgment module and the motor module are sequentially connected, and the uniformity judgment module is also connected with the setting module;
the setting module is used for setting a target value of the brightness uniformity of the automobile lamp;
the car light signal module is used for acquiring a car light signal and judging whether a car light is started or not;
the image acquisition module is used for acquiring a road image;
the image processing module is used for identifying preset characteristics of the road image and determining a preset detection area;
the uniformity judging module is used for judging the brightness uniformity in a preset detection area and generating a car lamp deflection signal;
and the motor module is used for controlling the deflection of the car lamp according to the car lamp deflection signal.
Specifically, the image processing module comprises a lane line identification unit, a road shoulder identification unit, a brightness acquisition unit, a cut-off line calibration unit, a left-right boundary determination unit, an upper-lower boundary determination unit, a preset detection region determination unit and a region segmentation unit; the lane line identification unit and the road shoulder identification unit are connected with the left and right boundary determination unit, the brightness acquisition unit and the light and shade cut-off line calibration unit are connected with the upper and lower boundary determination unit, the left and right boundary determination unit and the upper and lower boundary determination unit are connected with the preset detection area determination unit, and the preset detection area determination unit is connected with the area segmentation unit;
the lane line identification unit is used for identifying a lane line in the road image;
the road shoulder identification unit is used for identifying the road shoulder in the road image;
the brightness acquisition unit is used for acquiring the brightness value of a pixel in a road image;
the light and shade cut-off line calibration unit is used for calibrating the light and shade cut-off line of the vehicle lamp;
the left and right boundary determining unit is used for determining left and right boundaries of a preset detection area according to the lane line or the road shoulder;
the upper and lower boundary determining unit is used for determining the upper and lower boundaries of a preset detection area according to the brightness values and the cutoff lines of the pixels in the road image;
the preset detection area determining unit is used for determining the range of the detection area according to the left and right boundaries and the upper and lower boundaries;
the region dividing unit is used for dividing the preset detection region.
The invention has the beneficial effects that: according to the invention, the road image is obtained, the preset detection area is determined and divided into the detection sub-areas, and the deflection angle of the car lamp is controlled through the brightness polarity, so that the automatic control of the uniformity of the car light is realized.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling uniformity of vehicle lighting according to the present invention;
FIG. 2 is a schematic diagram of a preset detection area boundary according to the present invention;
FIG. 3 is a schematic view of a detector region of the present invention;
FIG. 4 is a schematic structural diagram of the device for controlling the uniformity of the light of the automobile according to the present invention;
fig. 5 is a schematic structural diagram of an image processing module of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are for reference and illustrative purposes only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, in one aspect, an embodiment of the present invention provides a method for controlling uniformity of light of an automobile, including:
step 1, obtaining a target value of the brightness uniformity of the automobile lamp.
In practice, the target value of the uniformity of the brightness of the vehicle light can be divided into several levels, for example:
grade 1: the brightness uniformity of the automobile lamp is more than 85%;
grade 2: the brightness uniformity of the automobile lamp is 80-85%;
grade 3: the brightness uniformity of the automobile lamp is 75-80%.
And 2, judging whether the vehicle lamp is started, if so, acquiring a front road image, and if not, continuously judging whether the vehicle lamp is started.
And 3, identifying the road image to obtain a preset detection area.
The step of obtaining the preset detection area comprises the following steps:
and step 301, determining a cut-off line of the light beam of the vehicle lamp.
The cutoff line refers to a cut-off line at which the light beam of the car lamp is projected onto the light distribution screen, and the light beam can be marked according to different car types when the light beam is visually perceived to have obvious changes in brightness.
Due to different driving positions, the cut-off line of the vehicle lamp on the same side of the driving position needs to be selected. As shown in fig. 2, L0 is the cutoff line of the method.
And 302, identifying whether lane lines exist on the left side and the right side of the vehicle, if so, taking the lane lines as left and right boundaries, otherwise, taking road shoulders on the left side and the right side of the vehicle as left and right boundaries of the preset detection area.
As shown in fig. 2, L1 and L2 are left and right lane lines. On a rural road without a lane line, road shoulders on the left side and the right side of the vehicle are used as left and right boundaries of the preset detection area due to the fact that the road surface is relatively narrow.
And step 303, acquiring an initial rear boundary line, wherein the initial rear boundary line is a line segment which is parallel to the cut-off line and tangent to the front edge of the vehicle.
As shown in FIG. 2, L3 is the initial back boundary line.
And 304, acquiring the cutoff line and the maximum brightness value of all pixels in the range of the initial back boundary.
And 305, taking the upper and lower boundaries of the region meeting the clipping brightness value as the upper and lower boundaries of the preset detection region.
The clipping luminance value L0 is k × Lmax, k is a scaling factor, and in the present embodiment, k is 75%.
As shown in fig. 2, L01 is the upper boundary of the region satisfying the clipping brightness value, that is, the upper boundary of the preset detection region; l31 is the lower boundary of the region satisfying the clipping luminance value, i.e., the lower boundary of the preset detection region.
Through the steps, the square area consisting of L01, L31, L1 and L2 in the preset detection area can be obtained.
And 4, dividing the preset detection area into a plurality of detection subareas.
In practical applications, the more the detection sub-regions are divided, the greater the difficulty of implementation, so that the β detection sub-regions can be divided according to practical situations in specific applications.
The step 4 comprises the following steps:
step 401, dividing the preset detection area into a left detection sub area and a right detection sub area by taking an extension line of a central shaft of the vehicle as a central line;
and 402, taking a central extension line of the left car light as a central line, equally dividing the left detection sub-region into an upper left detection sub-region and a lower left detection sub-region, and taking a central extension line of the right car light as a central line, equally dividing the right detection sub-region into an upper right detection sub-region and a lower right detection sub-region.
And 403, equally dividing the upper left detection sub-region, the lower left detection sub-region, the upper right detection sub-region and the lower right detection sub-region.
By analogy, the sub-regions obtained after the upper left detection sub-region, the lower left detection sub-region, the upper right detection sub-region and the lower right detection sub-region are equally divided again until the design requirements are met.
As shown in fig. 3, regions (i) to (viii) in the diagram are detector regions obtained by dividing the preset detection region.
And 5, determining the brightness polarity of each detection subarea.
Since the video signal output by the camera is generally in YUV or RGB format, only YUV format signals are described here.
The luminance value of an image pixel is the value of the Y component, and can be expressed as: i ═ y (h, v), h denotes the line coordinates of the image pixels, in pixel units; v denotes the column coordinates of the image pixels, in pixel units.
The step 5 comprises the following steps:
and step 501, obtaining the average pixel brightness of the preset detection area.
Setting the start pixel coordinate of the preset detection area as (0,0) and the end pixel coordinate as (m, n), the average pixel brightness of the preset detection area is:
step 502, obtaining the pixel average brightness of each detection sub-region.
Taking the sub-region (r) as an example, if the start pixel coordinate of the sub-region (r) is (0,0) and the end pixel coordinate is (e, f), the average brightness of the pixels of the sub-region (r) is:
the average pixel brightness for the remaining detector sub-regions is calculated in a similar manner.
Step 503, calculating a difference value between the average pixel brightness of the preset detection region and the average pixel brightness of each detection sub-region, and determining the brightness polarity of each detection sub-region according to the difference value.
The method comprises the following steps: and if the difference is greater than 0, determining that the brightness polarity is positive, if the difference is less than 0, determining that the brightness polarity is negative, and if the difference is equal to 0, determining that the brightness polarity is not present.
And 6, controlling the deflection of the car lamp according to the brightness polarity of each detection subarea.
In this embodiment, in the initial state, the voltage difference between the two terminals of the drive motor that deflects the lamp is 0V, and the lamp is not deflected.
The step 6 comprises the following steps:
when the brightness polarity of the detection subarea is positive, the driving motor outputs a high-level control signal to enable the car light to deflect anticlockwise;
when the brightness polarity of the detection subarea is negative brightness polarity, the driving motor outputs a low-level control signal to enable the car lamp to deflect clockwise;
and when the brightness polarity of the detection sub-region is the non-brightness polarity, the driving motor does not output the control signal.
And 7, judging whether the brightness uniformity of the automobile lamp after the automobile lamp is deflected meets a target value, if so, returning to the step 1, and otherwise, returning to the step 6.
Example 2
As shown in fig. 4, another aspect of the present invention provides an apparatus for controlling uniformity of vehicle light, including a setting module, a vehicle light signal obtaining module, an image processing module, a uniformity determining module, and a motor module; the automobile lamp signal acquisition module, the image processing module, the uniformity judgment module and the motor module are sequentially connected, and the uniformity judgment module is also connected with the setting module;
the setting module is used for setting a target value of the brightness uniformity of the automobile lamp;
the car light signal module is used for acquiring a car light signal and judging whether a car light is started or not;
the image acquisition module is used for acquiring a road image;
the image processing module is used for identifying preset characteristics of the road image and determining a preset detection area;
the uniformity judging module is used for judging the brightness uniformity in a preset detection area and generating a car lamp deflection signal;
and the motor module is used for controlling the deflection of the car lamp according to the car lamp deflection signal.
As shown in fig. 5, the image processing module includes a lane line recognition unit, a road shoulder recognition unit, a brightness acquisition unit, a cutoff line calibration unit, a left-right boundary determination unit, an upper-lower boundary determination unit, a preset detection region determination unit, and a region segmentation unit; the lane line identification unit and the road shoulder identification unit are connected with the left and right boundary determination unit, the brightness acquisition unit and the light and shade cut-off line calibration unit are connected with the upper and lower boundary determination unit, the left and right boundary determination unit and the upper and lower boundary determination unit are connected with the preset detection area determination unit, and the preset detection area determination unit is connected with the area segmentation unit;
the lane line identification unit is used for identifying a lane line in the road image;
the road shoulder identification unit is used for identifying the road shoulder in the road image;
the brightness acquisition unit is used for acquiring the brightness value of a pixel in a road image;
the light and shade cut-off line calibration unit is used for calibrating the light and shade cut-off line of the vehicle lamp;
the left and right boundary determining unit is used for determining left and right boundaries of a preset detection area according to the lane line or the road shoulder;
the upper and lower boundary determining unit is used for determining the upper and lower boundaries of a preset detection area according to the brightness values and the cutoff lines of the pixels in the road image;
the preset detection area determining unit is used for determining the range of the detection area according to the left and right boundaries and the upper and lower boundaries;
the region dividing unit is used for dividing the preset detection region.
The working engineering of the device corresponds to the automobile light uniformity control method, and is not repeated herein.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention.
Claims (5)
1. A method for controlling uniformity of automobile light is characterized by comprising the following steps:
step 1, obtaining a target value of the brightness uniformity of an automobile lamp;
step 2, judging whether the car light is turned on, if so, acquiring a front road image, and if not, continuously judging whether the headlight is turned on;
step 3, identifying the road image to obtain a preset detection area;
step 4, dividing the preset detection area into a plurality of detection subareas;
step 5, determining the brightness polarity of each detection subarea;
step 6, controlling the deflection of the car lamp according to the brightness polarity of each detection subarea;
step 7, judging whether the brightness uniformity of the automobile lamp after the automobile lamp deflection meets a target value, if so, returning to the step 1, otherwise, returning to the step 6;
the step 5 comprises the following steps:
step 501, obtaining the average pixel brightness of the preset detection area;
step 502, obtaining the pixel average brightness of each detection sub-region;
step 503, calculating a difference value between the average pixel brightness of the preset detection region and the average pixel brightness of each detection sub-region, and determining the brightness polarity of each detection sub-region according to the difference value;
the determining the brightness polarity of each of the detector sub-regions according to the difference value comprises: if the difference is greater than 0, determining the brightness polarity as positive, if the difference is less than 0, determining the brightness polarity as negative, and if the difference is equal to 0, determining the brightness polarity as no;
the step 6 comprises the following steps:
when the brightness polarity of the detection subarea is positive, the driving motor outputs a high-level control signal to enable the car light to deflect anticlockwise;
when the brightness polarity of the detection subarea is negative brightness polarity, the driving motor outputs a low-level control signal to enable the car lamp to deflect clockwise;
and when the brightness polarity of the detection sub-region is the non-brightness polarity, the driving motor does not output the control signal.
2. The method for controlling the uniformity of the light of an automobile according to claim 1, wherein the step of obtaining the preset detection area comprises:
step 301, determining a cut-off line of a vehicle lamp beam;
step 302, identifying whether lane lines exist on the left side and the right side of the vehicle, if so, taking the lane lines as left and right boundaries, otherwise, taking road shoulders on the left side and the right side of the vehicle as left and right boundaries of the preset detection area;
step 303, acquiring an initial rear boundary line, wherein the initial rear boundary line is a line segment which is parallel to the cut-off line and is tangent to the front edge of the vehicle;
step 304, acquiring the cutoff line and the maximum brightness values of all pixels in the range of the initial back boundary;
and 305, taking the upper and lower boundaries of the region meeting the cutting brightness value as the upper and lower boundaries of the preset detection region, wherein the cutting brightness value L0= k × Lmax, Lmax is the cut-off line and the maximum brightness value of all pixels in the range of the initial rear boundary line, and k is a proportionality coefficient.
3. The method of claim 1, wherein the step 4 comprises:
step 401, dividing the preset detection area into a left detection sub area and a right detection sub area by taking an extension line of a central shaft of the vehicle as a central line;
step 402, taking a central extension line of a left vehicle lamp as a central line, equally dividing the left detection sub-region into an upper left detection sub-region and a lower left detection sub-region, and taking a central extension line of a right vehicle lamp as a central line, equally dividing the right detection sub-region into an upper right detection sub-region and a lower right detection sub-region;
and 403, equally dividing the upper left detection sub-region, the lower left detection sub-region, the upper right detection sub-region and the lower right detection sub-region.
4. An automotive light uniformity control apparatus, comprising: the device comprises a setting module, a car light signal acquisition module, an image processing module, a uniformity judgment module and a motor module; the automobile lamp signal acquisition module, the image processing module, the uniformity judgment module and the motor module are sequentially connected, and the uniformity judgment module is also connected with the setting module;
the setting module is used for setting a target value of the brightness uniformity of the automobile lamp;
the car light signal acquisition module is used for acquiring car light signals and judging whether the car lights are started or not;
the image acquisition module is used for acquiring a road image;
the image processing module is used for identifying preset characteristics of the road image, determining a preset detection area and dividing the preset detection area into a plurality of detection subareas;
the degree of consistency judgement module for judge the luminance degree of consistency in predetermineeing the detection area, and generate car light deflection signal, include:
acquiring the average pixel brightness of the preset detection area;
acquiring the average pixel brightness of each detection subarea;
calculating the difference value between the pixel average brightness of the preset detection area and the pixel average brightness of each detection subarea, and determining the brightness polarity of each detection subarea according to the difference value;
the determining the brightness polarity of each of the detector sub-regions according to the difference value comprises: if the difference is greater than 0, determining the brightness polarity as positive, if the difference is less than 0, determining the brightness polarity as negative, and if the difference is equal to 0, determining the brightness polarity as no;
when the brightness polarity of the detection subarea is positive, the driving motor outputs a high-level control signal to enable the car light to deflect anticlockwise;
when the brightness polarity of the detection subarea is negative brightness polarity, the driving motor outputs a low-level control signal to enable the car lamp to deflect clockwise;
when the brightness polarity of the detection sub-area is the non-brightness polarity, the driving motor does not output a control signal;
and the motor module is used for controlling the deflection of the car lamp according to the car lamp deflection signal.
5. The device for controlling the uniformity of the automobile light according to claim 4, wherein the image processing module comprises a lane line identification unit, a road shoulder identification unit, a brightness acquisition unit, a cut-off line calibration unit, a left and right boundary determination unit, an upper and lower boundary determination unit, a preset detection region determination unit and a region segmentation unit; the lane line identification unit and the road shoulder identification unit are connected with the left and right boundary determination unit, the brightness acquisition unit and the light and shade cut-off line calibration unit are connected with the upper and lower boundary determination unit, the left and right boundary determination unit and the upper and lower boundary determination unit are connected with the preset detection area determination unit, and the preset detection area determination unit is connected with the area segmentation unit;
the lane line identification unit is used for identifying a lane line in the road image;
the road shoulder identification unit is used for identifying the road shoulder in the road image;
the brightness acquisition unit is used for acquiring the brightness value of a pixel in a road image;
the light and shade cut-off line calibration unit is used for calibrating the light and shade cut-off line of the vehicle lamp;
the left and right boundary determining unit is used for determining left and right boundaries of a preset detection area according to the lane line or the road shoulder;
the upper and lower boundary determining unit is used for determining the upper and lower boundaries of a preset detection area according to the brightness values and the cutoff lines of the pixels in the road image;
the preset detection area determining unit is used for determining the range of the detection area according to the left and right boundaries and the upper and lower boundaries;
the region dividing unit is used for dividing the preset detection region.
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| CN108773317A (en) * | 2018-01-03 | 2018-11-09 | 京东方科技集团股份有限公司 | A kind of vehicle light control method and device |
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| JPH10313545A (en) * | 1997-05-08 | 1998-11-24 | Mitsuba Corp | Control circuit for charging battery and lighting lamp |
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| KR101904714B1 (en) * | 2012-09-03 | 2018-10-05 | 현대모비스 주식회사 | Method for Initiating Adaptive Front Light System |
| CN103672664B (en) * | 2012-09-26 | 2017-03-01 | 中强光电股份有限公司 | Lighting device for vehicle |
| CN204739501U (en) * | 2015-03-12 | 2015-11-04 | 吴喜荣 | LED car wick and LED car light source of angularly adjustable |
| CN107433898B (en) * | 2017-08-09 | 2021-05-25 | 上海科世达-华阳汽车电器有限公司 | Control method of car light orientation, information processing device and system |
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| US7794124B2 (en) * | 2007-09-25 | 2010-09-14 | Michael Hulsey | Bi-directional boat running and emergency light apparatus and method |
| CN108773317A (en) * | 2018-01-03 | 2018-11-09 | 京东方科技集团股份有限公司 | A kind of vehicle light control method and device |
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