CN103438809A - Vehicle-width measurement method and device based on area-array / linear-array cameras - Google Patents
Vehicle-width measurement method and device based on area-array / linear-array cameras Download PDFInfo
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- CN103438809A CN103438809A CN2013103961824A CN201310396182A CN103438809A CN 103438809 A CN103438809 A CN 103438809A CN 2013103961824 A CN2013103961824 A CN 2013103961824A CN 201310396182 A CN201310396182 A CN 201310396182A CN 103438809 A CN103438809 A CN 103438809A
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Abstract
The invention relates to vehicle-width measurement and aims at realizing interference (stain) resistance, high precision and rapid and real-time acquisition of a vehicle width. Therefore, the technical scheme of the invention is a vehicle-width measurement method and device based on area-array / linear-array cameras. The device includes a light-screen frame, two area-array / linear-array CCD cameras, a scatterer, laser transmitters and a PC. The light-screen frame is fixed on the ground. The scatterer is positioned on the ground at the front section of the light-screen frame. The two area-array / linear-array CCD cameras are arranged symmetrically at the top parts of the rear end of the light-screen frame with the midpoint of a laser light screen as the center. Projections of main optical axes of the area-array / linear-array CCD cameras on the laser light screen form inclined angles Alpha with laser beams. A plurality of laser transmitters are evenly arranged on the light-screen frame, vertically above the scatterer. The laser beams transmitted by the plurality of laser transmitters form the laser light screen. The PC receives acquisition images of the CCD cameras. The vehicle-width measurement method and device based on the area-array / linear-array cameras is mainly applied to vehicle-width measurement.
Description
Technical field
The present invention is a kind of machine vision metrology method, specifically, the present invention carries out Treatment Analysis after the reflected image by face battle array or line-scan digital camera collection laser light curtain, dynamic measurement method, i.e. vehicle width dimension measurement method and device based on face battle array/line-scan digital camera while finally obtaining the high-precision real of tested vehicle width dimensions.
Technical background
The automobile outer profile size is the important content that automobile passability parameter and security of operation detect.Vehicle overload overload in recent years becomes the one of the main reasons that causes traffic hazard, badly influences national wealth and people's life safety, is also one of vehicle production quality-critical factor simultaneously.Wherein the width dimensions of vehicle is measured one of gordian technique during the car load outer profile size is measured; The method of being measured for the vehicle width size at present mainly contains the methods such as manual detection, light curtain method, Machine Vision Detection.Manual detection exists that the testing result error is large, labour intensity is high, efficiency is low, can not complete the limitation such as noncontact automatic measurement, the problem occurred for manual detection, and common method mainly contains light curtain Receiving and area array cameras acquisition method at present.Light curtain Receiving utilizes one group of vertical projection light curtain of laser instrument to be projected to the tested vehicle surface, utilize the photelectric receiver on ground to receive not by the laser beam of occlusion, realize the measurement to vehicle width by calculating receiving beam quantity, although this technical scheme can obtain the breadth extreme of dynamic vehicle, but the ground photelectric receiver very easily is subject to the impact of dust etc. in environment and vehicle tyre, cause the signal received error to occur, have influence on measuring accuracy; Utilize area array cameras to be installed on vehicle to be measured top and take its vertical view, finally by image processing algorithm, obtain the vehicle width dimensional parameters, but the method is subject to the impact of camera field of view scope and angle, make and have certain blind area of measuring, cause the vehicle width size to have certain error.
Summary of the invention
For overcoming the deficiencies in the prior art, the present invention is intended to realize anti-interference (spot), high precision, the real-time vehicle width dimensions obtains fast, for achieving the above object, the technical solution used in the present invention is, vehicle width dimension measuring device based on face battle array/line-scan digital camera, by light curtain frame, 2 linear arrays or area array CCD camera, scatterer, generating laser, PC forms, light curtain frame fixes on the ground, place scatterer on the ground of light curtain frame leading portion, at the top of light curtain frame rear end symmetrical 2 linear arrays or area array CCD camera placed centered by the mid point of laser light curtain, projection and the laser beam of the primary optical axis of linear array or area array CCD on the laser light curtain face has individual angle α, vertical direction at scatterer, evenly fixing some generating lasers on light curtain frame, the laser beam that some generating lasers send forms laser light curtain, PC receives the collection image of CCD camera.
Evenly fixing some generating lasers specifically evenly are placed on light curtain frame every 10mm, and laser light curtain is not set in the scope of central point ± 0.5m.
By means of the aforementioned vehicle width dimension measuring device based on face battle array/line-scan digital camera, realize, make vehicle pass laser light curtain, the part laser beam can be blocked and can not beat on scatterer by vehicle body, and the part laser beam do not blocked by car sound reflects via scatterer, by two linear arrays or area array CCD camera, both sides ground return laser spot is taken simultaneously, include the laser spot do not blocked by vehicle body in the image of imaging thus, and be linear array in image;
Simultaneously in the machine vision disposal system, the image that linear array or area array CCD are collected carries out the image processing, and analysis and calculation goes out the laser spot number comprised in the image of the left and right sides, is respectively N
1and N2, in light curtain maximum transversal distance B under known reference case, the corresponding length L by the left side number of spots
1with length L corresponding to right side luminous point data
2can calculate the greatest width dimension W of vehicle body, W=D-L
1-L
2.
The present invention possesses following technique effect:
The present invention proposes a kind of based on optical grating projection, optical imagery and machine vision and technology, utilize laser light curtain to project the orienting reflex film, take the ground laser spots by linear array or area array CCD camera, utilize machine vision technique to be processed the gained image, measuring process is simple, measuring speed is fast, is easy to realize.Be projected to the ground laser spots because system adopts scatterer reflector laser light curtain, avoid adopting traditional photelectric receiver to be subject to the impact of dust, spot, to change convenient simultaneously; This system adopts the method for laser light curtain and machine vision combination to have the ability of measuring and accurately monitoring real-time simultaneously.
The accompanying drawing explanation
Fig. 1 is vehicle overall width measuring system schematic diagram of the present invention.
Fig. 2 is vehicle overall width measuring system shop drawing of the present invention.
Fig. 3 is the innovation schematic diagram that vehicle overall width of the present invention is measured.
In Fig. 1,1 is computing machine, and 2,3 is face battle array or linear array CCD camera, and 4 is laser light curtain, and 5 is scatterer, and 6 is the laser frame, 7, the 8 left and right end laser rays that are laser light curtain.
In Fig. 2,2,3 is face battle array or linear array CCD camera, and 4 is laser light curtain, and 5 is scatterer, and 6 is the laser frame, and 9 is tested vehicle.
In Fig. 3,2,3 is face battle array or linear array CCD camera, and 4 is laser light curtain, and 5 is scatterer, and 6 is the laser frame, and 9 is tested vehicle.
Embodiment
The outstanding advantages of this programme is the width maximal value that can calculate fast and accurately vehicle ' s contour, and can avoid the drawback of more existing measuring methods, as be subject to, dust disturbs, arithmetic speed is slow, implementation condition is difficult etc.
The technical solution used in the present invention is that a kind of vehicle width dimension measurement method based on face battle array/line-scan digital camera comprises following part:
First is the laser light curtain projection system;
Utilize laser instrument to have good collimation, laser array is evenly arranged in to the top (every two laser array spacings are N, and the span of N is 5mm～50mm) of light curtain frame, laser instrument is vertically to bottom emission light beam;
Further, light curtain width is M, and scatterer is installed in light curtain frame bottom, and scatterer has reflection function to light; Place two linear arrays or area array CCD camera on the certain altitude of the rear of laser light curtain, the spacing of two cameras is L simultaneously, and symmetrical placement centered by laser light curtain;
Further, the laser light curtain height is H, and linear array or area array CCD camera height are h, and H and h can equate, also can not wait;
Further, the projection line of the primary optical axis of two cameras on the laser light curtain face becomes the visual field of a clamp machine to comprise vehicle one side with laser beam all luminous points and part automobile body;
Further, the body width of supposing tested vehicle is W, and the present invention must meet following relational expression: L>M>W;
Further, when the body width tested vehicle that is W during through measuring system, measuring system interlude part laser beam is blocked by the tested vehicle vehicle body, and the laser beam be not blocked can reflect via scatterer, linear array or area array CCD carry out imaging to folded light beam, and the laser spot of the distribution of line shape becomes linear picture point on linear array or area array CCD;
Second portion is CCD visual imaging disposal system;
Be passed on computing machine and processed by PCI capture card or network interface or USB oral instructions through the image of linear array or area array CCD collection, the CCD camera that is distributed in both sides is taken the image obtain and is comprised respectively laser spot and the part automobile body that a part of scatterer reflects, because vehicle body blocks, therefore linear laser bright spot through the scatterer catoptric imaging is arranged in the CCD image, extract linear bright spot feature by image processing techniques, calculate the number of spots of reflection, number with reference to whole laser group, and then can judge the number of spots that vehicle body blocks, the spacing distributed according to laser group and the transverse width dimension of laser frame, can calculate the width value of vehicle body.
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
In Fig. 1, system hardware comprises five parts, laser frame 6 fixes on the ground, place scatterer 5 on the ground of light curtain frame leading portion, at the top of light curtain frame rear end symmetrical 2 linear arrays or area array CCD camera placed centered by the mid point of laser light curtain, projection and the laser beam of the primary optical axis of linear array or area array CCD on the laser light curtain face has individual angle α, vertical direction at scatterer, evenly fixing some generating lasers on light curtain frame, every two generating laser interval 10mm, PC receives the collection image of CCD camera.
In Fig. 2, when system works, laser instrument evenly is placed on laser frame 6 every 10mm, form laser light curtain 4, be referenced to the practical minimum width of vehicle, in the scope of central point ± 0.5m, laser light curtain can be set, vehicle is through the light curtain, the part laser beam can be blocked and can not beat on scatterer 5 by vehicle body, and the part laser beam do not blocked by car sound reflects via scatterer, by two linear arrays or area array CCD camera, both sides ground return laser spot is taken simultaneously, include the laser spot do not blocked by vehicle body in the image of imaging thus, and be linear array in image.
Simultaneously in the machine vision disposal system, the image that linear array or area array CCD are collected carries out the image processing, and analysis and calculation goes out the laser spot number comprised in the image of the left and right sides, is respectively N
1and N2, in light curtain maximum transversal distance B under known reference case, the corresponding length L by the left side number of spots
1with length L corresponding to right side luminous point data
2can calculate the greatest width dimension W of vehicle body, W=D-L
1-L
2.
In Fig. 3, projection and the light beam of primary optical axis on light curtain face of two linear arrays or area array CCD is angled, and the spacing of two line array CCDs is greater than the width of grating, so maximum body width and the vehicle of high bodywork height through out-of-date, linear array or area array CCD also can completely obtain the vehicle body both sides and project the laser spot on scatterer, realize the vehicle gabarit of different in width and differing heights is measured.
Claims (3)
1. the vehicle width dimension measuring device based on face battle array/line-scan digital camera, it is characterized in that, by light curtain frame, 2 linear arrays or area array CCD camera, scatterer, generating laser, PC forms, light curtain frame fixes on the ground, place scatterer on the ground of light curtain frame leading portion, at the top of light curtain frame rear end symmetrical 2 linear arrays or area array CCD camera placed centered by the mid point of laser light curtain, projection and the laser beam of the primary optical axis of linear array or area array CCD on the laser light curtain face has individual angle α, vertical direction at scatterer, evenly fixing some generating lasers on light curtain frame, the laser beam that some generating lasers send forms laser light curtain, PC receives the collection image of CCD camera.
2. the vehicle width dimension measuring device based on face battle array/line-scan digital camera as claimed in claim 1, it is characterized in that, evenly fixing some generating lasers specifically evenly are placed on light curtain frame every 10mm, and laser light curtain is not set in the scope of central point ± 0.5m.
3. the vehicle width dimension measurement method based on face battle array/line-scan digital camera, it is characterized in that, by means of the described vehicle width dimension measuring device based on face battle array/line-scan digital camera of claim 1, realize, make vehicle pass laser light curtain, the part laser beam can be blocked and can not beat on scatterer by vehicle body, and the part laser beam do not blocked by car sound reflects via scatterer, by two linear arrays or area array CCD camera, both sides ground return laser spot is taken simultaneously, include the laser spot do not blocked by vehicle body in the image of imaging thus, and be linear array in image,
Simultaneously in the machine vision disposal system, the image that linear array or area array CCD are collected carries out the image processing, and analysis and calculation goes out the laser spot number comprised in the image of the left and right sides, is respectively N
1and N2, in light curtain maximum transversal distance B under known reference case, the corresponding length L by the left side number of spots
1with length L corresponding to right side luminous point data
2can calculate the greatest width dimension W of vehicle body, W=D-L
1-L
2.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103983196A (en) * | 2014-05-12 | 2014-08-13 | 天津大学 | Car height on-line measurement method based on area-array/line-scan digital camera |
| CN104296691A (en) * | 2014-10-28 | 2015-01-21 | 电子科技大学 | Aircraft engine tail profile measurement device and method based on machine vision |
| CN107517374A (en) * | 2017-07-19 | 2017-12-26 | 西安工业大学 | A kind of determination method and device of line-scan digital camera visual field |
| CN108981589A (en) * | 2018-06-05 | 2018-12-11 | 东南大学 | A kind of device and method for measuring cup open height |
| CN109716057A (en) * | 2016-09-13 | 2019-05-03 | 株式会社明电舍 | Insulator detection device and isolator detecting method |
| CN110062911A (en) * | 2016-12-12 | 2019-07-26 | 富士胶片株式会社 | Projection display device, the control method of projection display device, the control program of projection display device |
| CN112304577A (en) * | 2020-11-06 | 2021-02-02 | 歌尔光学科技有限公司 | Light curtain size testing method, light curtain size testing equipment and storage medium |
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| CN108981589B (en) * | 2018-06-05 | 2021-04-27 | 东南大学 | Device and method for measuring cup rim height |
| CN112304577A (en) * | 2020-11-06 | 2021-02-02 | 歌尔光学科技有限公司 | Light curtain size testing method, light curtain size testing equipment and storage medium |
| CN112304577B (en) * | 2020-11-06 | 2022-04-22 | 歌尔光学科技有限公司 | Light curtain size testing method, light curtain size testing equipment and storage medium |
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Application publication date: 20131211 |