CN103047942B - Visual acquisition system and method for geometrical characteristics of graded crushed rocks of railway and road beds - Google Patents
Visual acquisition system and method for geometrical characteristics of graded crushed rocks of railway and road beds Download PDFInfo
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- CN103047942B CN103047942B CN201210573700.0A CN201210573700A CN103047942B CN 103047942 B CN103047942 B CN 103047942B CN 201210573700 A CN201210573700 A CN 201210573700A CN 103047942 B CN103047942 B CN 103047942B
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Abstract
The invention discloses a visual acquisition system and a visual acquisition method for geometrical characteristics of graded crushed rocks of railway and road beds. The system consists of a test stand and test cameras. The test stand consists of adjustable bottom plates, side plates and camera bracket kits. The cameras are arranged on brackets consisting of camera support rods and fine adjustment knob lifting frames, and are used for acquiring images of crushed rocks to be tested. The front surfaces, the upper surfaces and the lateral surfaces of the crushed rocks are imaged to form three views of the crushed rocks, the three views are input into a computer through a data line by a high-speed image acquisition card, and a true three-dimensional model of particles is recovered by a three-dimensional reconstruction technology. The system and the method can be used for quickly and accurately acquiring the geometrical characteristics and grading characteristics of the graded crushed rocks which are widely used for railways and roads; and in addition, the crushed rock particle model acquired by the system can be directly combined with discrete element software to analyze the forced movement of the graded crushed rocks of the railway and road beds under the load action of trains as well as the long-term settlement of the graded crushed rocks.
Description
Technical field
The present invention relates to the visual acquisition system of geometric properties and acquisition method, relate in particular to the visual acquisition system of a kind of Rail Highway bedding graded broken stone geometric properties and method.
Background technology
Along with the fast development of China Express Railway building cause, improve Subgrade Construction Quality, adapt to Leap-forward Development of Railway, seem very important, and the appearance of Line for Passenger Transportation, the design to traditional railway, construction and maintenance have proposed brand-new challenge more.Railway bed is the important component part of railway engineering, and it is mainly made up of the following embankment of surface layer of subgrade bed, bottom layer of subgrade and bedding as earthen structure, and the sedimentation of roadbed is mainly also that the stack of these a few part sedimentations produces.Graded broken stone layer is as the direct basis of track structure, its movement of particles restructuring and the quasi-plastic property distortion and the consequent subgrade settlement that cause are just urgently studied.Practice at home and abroad shows, the track deformation that poor grain size distribution metalling causes is several times of good graded broken stone layer, and its gap has the trend further widening with the raising of train speed.The size and dimension of gravel particle distributes and will determine their usability, own through becoming a kind of indispensable technology in the field of traffic facilities such as railway and highway to gravel particle test.In order to grasp the grating of rubble, the traditional method for sieving of general employing at present, it is large that its shortcoming mainly contains noise, and dust pollution is serious, takes time and effort simultaneously, and measuring accuracy is not high, and the data of obtaining are comparatively coarse.Have a lot of scholars to be devoted to theory and the experimental study of subgrade settlement, and the research of the stressed restructuring under High-speed Train Loads and long-term settlement thereof is confined to triaxial test and experience value mostly to railway bed graded broken stone.In the analysis of railway bed, can not consider the discreteness of rubble and the geometric characteristic of itself, so analysis result and actual test data differ greatly.
Summary of the invention
The object of the invention is to overcome the deficiency of traditional macadam gradating size analysis, a kind of visual acquisition system and method for Rail Highway bedding graded broken stone are provided, can be for the three-view diagram imaging of graded broken stone, coordinate three-dimensional reconstruction reduction particle shape, can be used for obtaining of gravel particle three-dimensional geometry feature and Grading feature, and can be in conjunction with discrete element software analysis bedding graded broken stone stressed restructuring and the Long-term Settlement thereof under action of traffic loading.
For achieving the above object, the technical solution used in the present invention is:
One, the visual acquisition system of a kind of Rail Highway bedding graded broken stone geometric properties:
The present invention has adopted the layout that image capturing system is installed on horizontal articles holding table, complete black projection plate is installed in one end at horizontal articles holding table, vertical knob trimming rack is installed in complete black projection plate outside, in vertical supports, be equipped with horizontal knob trimming rack, video camera and LED light source with camera lens are housed on horizontal stand, at the other end of horizontal articles holding table, T-shaped rivet regulating base board and inclination rivet regulating base board are installed, on two base plates, sliding bottom and LED light source are housed respectively, on two sliding bottoms, the video camera with camera lens is all housed, three video cameras are connected to high speed image acquisition board by data line respectively, capture card is connected with computing machine.
The shooting light path of install on horizontal knob trimming rack, T-shaped rivet regulating base board and inclination rivet regulating base board three video cameras with camera lens is perpendicular to one another and meets at a bit, places rubble to be measured and carry out data acquisition on this joint.
Two, the visual acquisition method of a kind of Rail Highway bedding graded broken stone geometric properties:
1) utilize three video cameras with camera lens to gather the image of three angles of rubble to be measured simultaneously;
2) photo of three same rubbles of simultaneously taking is inputted to high speed image acquisition board by data line and carry out rough handling;
3) thus carry out from high speed image acquisition board input computing machine through three photos of rough handling that image is cut apart, three-dimensional reconstruction based on outline line obtains three-dimensional model.
The shooting visual angle of three described photos is perpendicular to one another, and three images that use three different visual angles that are perpendicular to one another simultaneously to take obtain the three-dimensional model of rubble to be measured by three-dimensional reconstruction.
The beneficial effect that the present invention has compared with background technology is:
(1) accurately the front to rubble, above and three directions such as side make a video recording, the edge image obtaining just can filter out pseudo-edge situation;
(2) just can reduce ideally particle shape in conjunction with three-dimensional reconstruction, thereby overcome conventional screen separating tests and only determine the shortcoming of minimum grain size, meet the accuracy requirement of rubble sreen analysis;
(3) after reduction particle shape, in conjunction with analytical technologies such as discrete element softwares, can carry out stressed restructuring and the Long-term Settlement thereof of bedding graded broken stone under action of traffic loading.
Accompanying drawing explanation
Fig. 1 is overall system distribution view.
In figure: 1-data line, 2-T snap riveting nail regulating base board, 3-inclination rivet regulating base board, 4-sliding bottom, the horizontal object disposing platform of 5-, 6-LED light source, the complete black projection plate of 7-, the vertical knob trimming rack of 8-, the horizontal knob trimming rack of 9-, 10-video camera, 11-camera lens, 12-computing machine, 13-high speed image acquisition board.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
The visual acquisition system of Rail Highway bedding graded broken stone geometric properties as shown in Figure 1, the present invention adopts horizontal object disposing platform 5, T-shaped rivet regulating base board 2 and inclination rivet regulating base board 3 are arranged on to a side of articles holding table, vertical knob trimming rack 8 is arranged on to the opposite side midpoint of articles holding table, horizontal knob trimming rack 9 is arranged on vertical knob trimming rack 8, complete black projection plate 7 is vertically mounted on the horizontal articles holding table 5 of vertical knob trimming rack 8 one sides and holding plate face vertical with horizontal knob trimming rack 9.On horizontal knob trimming rack, level is installed LED light source 5, after regulating support height according to camera size, macome-scale, First video camera 10 and camera lens 11 are installed, and carry out coarse adjustment, install in the same way again second video camera, after being connected with rotating shaft, it is installed on sliding bottom 4, and its entirety is fixed on to inclination rivet regulating base board 3 with rivet, install in the same way again the 3rd video camera, after it is connected with rotating shaft, be installed on sliding bottom 4, and its entirety is fixed on to T-shaped rivet regulating base board 2 with rivet.The rubble that will carry out testing graininess collection is placed on to horizontal object disposing platform 5 central authorities, the rotating shaft of adjusting knob trimming rack 8,9 and horizontal positioned camera below is finely tuned, make three cameras illumination circuit can with a bit, and orthogonal, be intersected on rubble near as far as possible near center of gravity place.After the adjustment of seat in the plane, make a video recording, then connection data line 1 is to high speed image acquisition board 13, thereby photo is inputted computing machine 12 and carried out three-dimensional reconstruction calculating reduction particle shape and obtain three-dimensional model after the rough handling of high speed image acquisition board 13.Thereby the set-point all standard component will be placed on to this batch of rubble shooting after the geometric properties image information that gathers a collection of rubble to be measured time is taken and is demarcated, and carry out reconstructing three-dimensional model and obtain its volume, the ratio of the true volume of standard component and its modeling gained volume is made as scale-up factor, by the model volume of this batch of rubble to be measured of this scale-up factor correction, physical dimension that just can rediscover.
The visual acquisition method of Rail Highway bedding graded broken stone geometric properties is:
1) use three video cameras 10 with camera lens 11 to gather the image information of orthogonal three different visual angles of rubble to be measured simultaneously, and three images are inputted to high speed image acquisition board 13 by data line 1;
2) thus by high speed image acquisition board 13, image being carried out to pre-service is converted into gray level image and completes threshold filtering and obtain the stone profile diagram at three visual angles, input computing machine 12 after profile diagram is converted to bianry image;
3) adopt the sequential operation that Matlab and C++ programming language are write to form three visual angles outline line separately three profile diagram inputs;
4) multiple outline lines are carried out to backprojection operation in shooting point separately forms multiple cones and calculates the point set in the cross profile of back projection by program in three dimensions;
5) according to this point set, adopt matching algorithm the point on adjacent three-dimensional planar between two to be connected to the surface of reconstruction of objects, rubble to be measured can be carried out being exported by computing machine 2 after reconstructing three-dimensional model by this process.
Claims (2)
1. the visual acquisition system of Rail Highway bedding graded broken stone geometric properties, it is characterized in that: adopted in the upper layout that image capturing system is installed of horizontal articles holding table (5), a side at horizontal articles holding table (5) is installed complete black projection plate (7), vertical knob trimming rack (8) is installed in complete black projection plate (7) outside, in vertical supports, be equipped with horizontal knob trimming rack (9), video camera (10) and the LED light source (6) of band camera lens (11) are housed on horizontal stand, at the opposite side of horizontal articles holding table (5), T-shaped rivet regulating base board (2) and inclination rivet regulating base board (3) are installed, sliding bottom (4) and LED light source (6) are housed respectively on two base plates, the video camera (10) of band camera lens (11) is all housed on two sliding bottoms (4), three video cameras (10) are connected to high speed image acquisition board (13) by data line (1) respectively, capture card (13) is connected with computing machine (12).
2. the visual acquisition system of a kind of Rail Highway bedding graded broken stone geometric properties according to claim 1, it is characterized in that: the shooting light path of the video camera (10) of three band camera lenses (11) of installing on horizontal knob trimming rack (9), T-shaped rivet regulating base board (2) and inclination rivet regulating base board (3) is perpendicular to one another and meets at a bit, places rubble to be measured and carry out data acquisition on this joint.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210573700.0A CN103047942B (en) | 2012-12-26 | 2012-12-26 | Visual acquisition system and method for geometrical characteristics of graded crushed rocks of railway and road beds |
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| CN201210573700.0A CN103047942B (en) | 2012-12-26 | 2012-12-26 | Visual acquisition system and method for geometrical characteristics of graded crushed rocks of railway and road beds |
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| CN104008573B (en) * | 2014-06-11 | 2018-04-20 | 清华大学 | Grading analysis method and particle based on three-dimensional configuration place stent |
| CN111515138A (en) * | 2020-04-26 | 2020-08-11 | 同济大学 | Railway ballast intelligent screening device based on particle morphology recognition |
| CN112986069B (en) * | 2021-02-26 | 2023-01-17 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Degradation index analyzer for ballast particles |
| CN113177949B (en) * | 2021-04-16 | 2023-09-01 | 中南大学 | Large-size rock particle feature recognition method and device |
| CN113533145A (en) * | 2021-07-09 | 2021-10-22 | 清华大学 | Rockfill particle size identification and monitoring device and method based on camera set three-dimensional reconstruction |
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| CN100570275C (en) * | 2008-04-08 | 2009-12-16 | 长安大学 | A kind of volume measurement device and measuring method thereof based on image |
| CN201449253U (en) * | 2009-06-05 | 2010-05-05 | 广东工业大学 | Multi-view collecting device by utilizing liquid surface to obtain shape of product |
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