CN103759637A - Auxiliary measuring target - Google Patents
Auxiliary measuring target Download PDFInfo
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- CN103759637A CN103759637A CN201410003023.8A CN201410003023A CN103759637A CN 103759637 A CN103759637 A CN 103759637A CN 201410003023 A CN201410003023 A CN 201410003023A CN 103759637 A CN103759637 A CN 103759637A
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Abstract
The invention relates to an auxiliary measuring target and belongs to the technical field of measurement. The auxiliary measuring target comprises a measuring bar, wherein a track ball is assembled on the top of the measuring bar in a rotary mode, marking holes are evenly distributed in the surface of the track ball, a measuring rod capable of rotating along with the measuring bar is further fixedly mounted on the measuring bar, and a mark point is arranged on one side of the measuring rod. When the auxiliary measuring target is used, after a cameral finishes measurement within an effective viewing field, the camera is moved to another position, the pose of the track ball is kept unchanged, the measuring bar is rotated at the same time to enable the side provided with the mark point to directly face the camera, and the rotating angle of the measuring bar is recorded; meanwhile, the mutual relation before and after tracking can be obtained through the track ball and each marking hole in the track ball, space splicing can be conducted on multiple groups of coordinate values through the mutual relation, and then the reconstitution of the three-dimensional shape of a large part is achieved.
Description
Technical field
The present invention relates to a kind of subsidiary target, belong to field of measuring technique.
Background technology
Large-sized curved surface is widely used at aspects such as auto industry, boats and ships and spacecraft profiles in recent years, development need along with modern processing and manufacturing and production operation, the measurement of heavy parts three-dimensional geometry size has become the shoring of foundation technology of modern reverse-engineering and Product Digitalization Design and manufacture, and increasing assembling, quality control, detect online, the also three-dimensional measurement of heavy parts in the urgent need to address of the fields such as tool locating of industrial products.Along with being gradually improved and the continuous progress of the technology such as image processing, pattern-recognition of computer technology, electronics, optical technology, computer vision measurement technology is rapidly developed, and becomes gradually the topmost measurement means of heavy parts surface three dimension information.At present the heavy parts measuring technique based on monocular vision mainly contains: geometric similarity method is measured, geometric constraints method is measured, structured light method is measured, geometrical optics approach is measured and auxiliary target mapping amount, wherein only has the measurement that auxiliary target mapping amount can the invisible point in implementation space.
On target, be generally designed with the mark with distinct characteristic and produce monumented point, whether luminous according to monumented point, target can be divided into gauge without light source target and have light source target two classes, wherein gauge without light source target is the special pattern generating monumented point utilizing on target, be generally and obtain desirable monumented point image, also need to use specific light source to irradiate target, this kind of target is affected by environment larger; There is light source target to utilize luminophor, for example LED produces monumented point, tradition has light source target to determine light point area by two-value method, utilize gravity model appoach or ellipse fitting method to extract monumented point center, binary conversion treatment and the imaging of monumented point different angles due to image, the optical spot centre proposing by gravity model appoach or ellipse fitting method, not corresponding to same point in space, reduces measuring accuracy.
Summary of the invention
The object of this invention is to provide a kind of subsidiary target, to solve limited causing of current subsidiary target measurement range in measuring process, all tested points in heavy parts cannot be measured to complete problem.
The present invention provides a kind of subsidiary target for solving the problems of the technologies described above, this measurement target drone comprises a measuring staff, measuring staff top is rotatably equipped with station ball, this turns station and is evenly laid with index aperture on ball surface, on this measuring staff, be also installed with the measuring stick that can rotate with measuring staff, on a face of this measuring stick, be provided with monumented point, this face when measuring all the time over against video camera, the described ball below, station that turns is fixedly installed the platform that turns that is carved with angle value, for recording the anglec of rotation of measuring staff.
The described index aperture turning on the ball of station is cylindrical hole, and the axis of each index aperture intersects with the centre of sphere that turns station ball.
Described monumented point comprises 16 circular light echo reflection auxiliary sign points and 4 measurement monumented points, every 4 auxiliary sign points distribution of being rectangle in described 16 circular light echos reflection auxiliary sign points, 4 described measurements arrange respectively with monumented point on the diagonal line intersection point of 4 auxiliary sign points of the distribution of being respectively rectangle.
On described monumented point, be provided with glass particle, be used to form bianry image.
The below of described measuring staff is provided with gauge head, and trigger switch is housed on gauge head, with the sampling of controlling measured point.
The invention has the beneficial effects as follows: measurement target drone of the present invention comprises a measuring staff, measuring staff top is rotatably equipped with station ball, this turns station and is evenly laid with index aperture on ball surface, on this measuring staff, be also installed with the measuring stick that can rotate with measuring staff, on a face of this measuring stick, be provided with monumented point, the present invention in use, after measuring in video camera Yi Ge apparent field, mobile camera is to another position, assurance turns station ball pose and does not change, rotate measuring staff makes the one side of posting monumented point over against video camera simultaneously, and record the anglec of rotation of measuring staff, simultaneously by turning station ball and turning each index aperture on the ball of station, can obtain turning and stand afterwards and turn the mutual relationship before station, by the mutual relationship between them, some groups of coordinate figures can be carried out to space splicing, the reconstruct of realization to heavy parts three-dimensional appearance, the present invention can be in 1000mm * 1000mm * 1000mm measurement range, turn station precision and meet measurement requirement, realized to heavy parts fast, high precision, on a large scale, automatically measure cheaply and rebuild.
Accompanying drawing explanation
Fig. 1 is the structural drawing of monocular vision measuring system;
Fig. 2 is the structural representation of subsidiary target of the present invention;
Fig. 3 is the structural representation that turns station ball of subsidiary target of the present invention;
Fig. 4 is the structural representation that turns platform of subsidiary target of the present invention;
Fig. 5 surveys the distribution schematic diagram of the upper monumented point of rod in subsidiary target of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
Subsidiary target of the present invention as shown in Figure 2, comprise measuring staff 1, on measuring staff 1, be rotatably equipped with station ball 2, turning ball 2 belows, station is installed with and turns platform 3, on measuring staff 1, being also installed with can be with the survey rod 4 of measuring staff 1 rotation, on a face of survey rod 3, be provided with monumented point, measuring staff 1 below is provided with gauge head 5.Turning station ball 2 is a spheroid, as shown in Figure 3, on its outside surface, according to certain angle, is laid with index aperture uniformly in the intersection location of warp and parallel, and index aperture is the cylindrical hole G lower than spherome surface
1, G
2..., G
nthe axis of each index aperture and the centre of sphere intersect, in each index aperture, paste respectively the different circular thin subsides of colored light echo reflection of shades of colour, the position of each index aperture in auxiliary target determined by colour code is unique, by turning on the ball of station index aperture, carry out space and turn station and splicing, realize the reconstruct to the three-dimensional appearance of heavy parts.Turn platform 3 as shown in Figure 4, turn the angle that is carved with 360 degree uniform encodings on platform 3, while fighting in different parts measurement for showing, the angle of the rotation of measuring staff, surveys rod 3 as shown in Figure 5, be an ater rectangular parallelepiped, on one of them surface, be provided with 16 circular light echo reflection auxiliary sign point N that dimension information is known
1, N
2..., N
16with 4 measurement monumented point P
1, P
2, P
3, P
4, every 4 auxiliary sign point rectangularities distribute, respectively in rectangular 4 summits, 16 auxiliary sign points are divided into 4 rectangular profile regions, 4 measurements with monumented point respectively on above-mentioned 4 cornerwise intersection points of rectangular region, each monumented point is provided with a kind of glass particle of high index of refraction, reflection strength is high, survey clavate with black and become sharp contrast, be easy to be separated with background light source, to form clear and outstanding bianry image, it is reference position with turning the tangent place of platform that survey rod has the one side of monumented point, during measurement, the excellent both sides of hand-held survey make the one side of posting monumented point over against video camera 6.
Gauge head 4 has good rigidity and sphericity, can detect flexibly the point on various surfaces externally and internallies, on gauge head 4, trigger switch is installed, to facilitate the sampling of controlling measured point, generally select sphericity high have that high-hardness ceramic material makes industrial ruby, during measurement, gauge head is tightly close to measured point, guarantee the stability of target in image acquisition, the length of measuring staff 5 can regulate according to tested part, for meeting, measure rigidity requirement, measuring staff length is more short better, increase measuring staff length and can reduce measuring accuracy, but for some difficult position or blind spot of surveying, measuring staff length can regulate according to actual measurement situation, be particularly suitable for aircraft wing or fuselage, automobile chassis or vehicle body, the measurement of the objects such as workshop platform, the length that considers measuring staff should be selected 50-110mm.
The principle of work of this subsidiary target is as follows:
First the points of tangency of surveying excellent mark is positioned at and turns platform 0 scale place, the excellent both sides of hand-held survey during measurement, order is surveyed rod and is posted monumented point one side over against video camera, when the rigid body measuring head of putting on when auxiliary target contacts with part tested point is vertical, trigger switch synchro control video camera on gauge head obtains the characteristic image information of target index aperture and monumented point, and image pick-up card gathers image; After measuring in video camera Yi Ge apparent field, mobile camera is to another position, assurance turns station ball pose and does not change, rod is surveyed in rotation simultaneously makes the one side of posting monumented point over against video camera, turn the angle value that is carved with 360 degree uniform encodings on platform, can record the angle value of surveying rod rotation, then start to measure, until all measurement of curved surface of heavy parts are complete; The image transmitting that image pick-up card is gathered is to computing machine, adopt least square ellipse fitting algorithm to calculate 16Ge auxiliary sign dot center pixel coordinate, every 4 auxiliary sign dot center can construct quadrilateral, utilize quadrilateral diagonal line intersection point can obtain 4 survey mark dot center pixel coordinate value, while having guaranteed the different attitude imaging of target, the monumented point center extracting is corresponding to same point in space, thereby improved measuring accuracy.Turn station ball and turn each special index aperture on the ball of station, can obtain turning and stand rear and turn the mutual relationship before station, by the mutual relationship between them, some groups of coordinate figures can be carried out to space splicing, realize the reconstruct to heavy parts three-dimensional appearance.In 1000mm * 1000mm * 1000mm measurement range, turn station precision and meet measurement requirement.The present invention has overcome that stereoscopic vision and other vision measurement technology monumented points coupling is difficult, three dimensions splices complicated technical barrier, realize to heavy parts fast, high precision, automatically measure and rebuild on a large scale, cheaply.
Claims (5)
1. a subsidiary target, it is characterized in that, this measurement target drone comprises a measuring staff, measuring staff top is rotatably equipped with station ball, and this turns on ball surface, station and is evenly laid with index aperture, is also installed with the measuring stick that can rotate with measuring staff on this measuring staff, on a face of this measuring stick, be provided with monumented point, this face when measuring all the time over against video camera, described in turn ball below, station and be fixedly installed the platform that turns that is carved with angle value, for recording the anglec of rotation of measuring staff.
2. subsidiary target according to claim 1, is characterized in that, described in to turn the index aperture of station on ball be cylindrical hole, the axis of each index aperture intersects with the centre of sphere that turns station ball.
3. subsidiary target according to claim 1, it is characterized in that, described monumented point comprises 16 circular light echo reflection auxiliary sign points and 4 measurement monumented points, every 4 auxiliary sign points distribution of being rectangle in described 16 circular light echos reflection auxiliary sign points, 4 described measurements arrange respectively with monumented point on the diagonal line intersection point of 4 auxiliary sign points of the distribution of being respectively rectangle.
4. subsidiary target according to claim 3, is characterized in that, on described monumented point, is provided with glass particle, is used to form bianry image.
5. subsidiary target according to claim 3, is characterized in that, the below of described measuring staff is provided with gauge head, and trigger switch is housed on gauge head, with the sampling of controlling measured point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003023.8A CN103759637B (en) | 2014-01-03 | 2014-01-03 | A kind of subsidiary target |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003023.8A CN103759637B (en) | 2014-01-03 | 2014-01-03 | A kind of subsidiary target |
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| Publication Number | Publication Date |
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| CN103759637A true CN103759637A (en) | 2014-04-30 |
| CN103759637B CN103759637B (en) | 2016-08-17 |
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| CN201410003023.8A Expired - Fee Related CN103759637B (en) | 2014-01-03 | 2014-01-03 | A kind of subsidiary target |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807403A (en) * | 2015-04-23 | 2015-07-29 | 上海大学 | Driving light measuring rod for size measurement of large workpiece |
| CN105588484A (en) * | 2016-02-26 | 2016-05-18 | 共享装备股份有限公司 | Measuring arm position-shifting reference correcting device |
| CN105717935A (en) * | 2014-11-30 | 2016-06-29 | 中国科学院沈阳自动化研究所 | Three-dimensional target for visual guidance system |
| CN110378939A (en) * | 2018-07-27 | 2019-10-25 | 北京京东尚科信息技术有限公司 | Image coding, identification, method, system, equipment and the storage medium tracked |
| CN112665523A (en) * | 2020-11-24 | 2021-04-16 | 北京星航机电装备有限公司 | Combined measurement method for complex profile |
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2014
- 2014-01-03 CN CN201410003023.8A patent/CN103759637B/en not_active Expired - Fee Related
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717935A (en) * | 2014-11-30 | 2016-06-29 | 中国科学院沈阳自动化研究所 | Three-dimensional target for visual guidance system |
| CN104807403A (en) * | 2015-04-23 | 2015-07-29 | 上海大学 | Driving light measuring rod for size measurement of large workpiece |
| CN105588484A (en) * | 2016-02-26 | 2016-05-18 | 共享装备股份有限公司 | Measuring arm position-shifting reference correcting device |
| CN110378939A (en) * | 2018-07-27 | 2019-10-25 | 北京京东尚科信息技术有限公司 | Image coding, identification, method, system, equipment and the storage medium tracked |
| CN110378939B (en) * | 2018-07-27 | 2021-11-02 | 北京京东乾石科技有限公司 | Method, system, device and storage medium for image coding, recognition and tracking |
| CN112665523A (en) * | 2020-11-24 | 2021-04-16 | 北京星航机电装备有限公司 | Combined measurement method for complex profile |
| CN112665523B (en) * | 2020-11-24 | 2022-04-19 | 北京星航机电装备有限公司 | Combined measurement method for complex profile |
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| CN103759637B (en) | 2016-08-17 |
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