CN102692202A - Reverse measurement method - Google Patents
Reverse measurement method Download PDFInfo
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- CN102692202A CN102692202A CN201210007308XA CN201210007308A CN102692202A CN 102692202 A CN102692202 A CN 102692202A CN 201210007308X A CN201210007308X A CN 201210007308XA CN 201210007308 A CN201210007308 A CN 201210007308A CN 102692202 A CN102692202 A CN 102692202A
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- measuring
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Abstract
The invention relates to a reverse measurement method. Before a measuring device is moved, any fixed object within the application range of the measuring device is taken as a reference object; the coordinate value of at least one point on the reference object is measured by the measuring device; after the measuring device is moved, the coordinate value of the reference point on the reference object is measured again to obtain the coordinate system difference value before and after the measuring device is moved; the difference value is compensated into the point cloud coordinate value which is obtained by measurement after the measuring device is moved, so that the point cloud coordinate values which are obtained by measurement before and after the measuring device is moved can be in the same coordinate system and correct splicing of point cloud can be realized, thereby solving the problem that the measurement coordinate system can not be moved in the actual reverse measurement process. By adopting the measurement method, the application range of the reverse measuring device can be enlarged. Every time the measuring device is moved, the application range of the measuring device is widened once. Thus the measured objects of the measuring device can be widened and the use efficiency of the measuring device is improved.
Description
Technical field
The present invention relates to a kind of anti-measuring method of asking, belong to the mechanical measurement technique field.
Background technology
Reverse engineering (Reverse Engineering; RE); Also claim reverse-engineering, reverse engineering, be meant with certain measurement means material object or model are measured, according to the process of measurement data through 3 d geometric modeling method reconstruct cad model in kind; Be one and generate product digital information model from sample, and the overall process of carrying out product design and development and production on this basis.In reverse engineering, need multimeter to obtain how much cloud datas on the object appearance.Some measuring equipment need mark on Measuring Object and a little set up the coordinate system of a cloud, and these measuring equipments can mobile measuring equipment and testee when measuring.Some measuring equipment need not mark on Measuring Object and a little set up measurement coordinate system, but sets up a measurement coordinate system through the residing position of measuring equipment, and Measuring Object and measuring equipment all can not move.These measuring equipments can't not accomplished measurement during mobile measuring equipment when measuring the pattern complicated object; When the measuring object size has exceeded the measurement range of testing tool, also need be in measuring process mobile measuring equipment.Overcoming the above problems all needs the mobile test instrument, and this moment, variation also took place measurement coordinate system.The cloud data that measurement coordinate system can cause moving fore-and-aft survey not under the same coordinate system, thereby make the cloud data of acquisition can't correctly reflect how much patterns of actual scanning object.
Summary of the invention
The cloud data that the objective of the invention is to solve the mobile fore-and-aft survey that brings in the counter measurement coordinate system of asking mobile test instrument in the measuring process not under the same coordinate system, thereby make the cloud data of acquisition can't correctly reflect the problem of how much patterns of actual scanning object.
The present invention provides a kind of anti-measuring method of asking for solving the problems of the technologies described above, and the concrete steps of this method are following:
1). the measuring object that need carry out twice measurement at least is fixed on a certain position, with surveying instrument how much patterns of this measuring object is carried out cloud data and extracts, to obtain the part cloud data A1 of measuring object;
2). choose that a fixing arbitrarily object is an object of reference in the surveying instrument measurement range, and choose at least and a bit be reference point in the object of reference;
3). with surveying instrument the reference point on the selected object of reference is measured, to obtain the coordinate figure B1 of reference point under this coordinate system;
4). traverse measurement instrument, the and respectively reference point on measuring object and the selected object of reference being measured, to obtain moving reference point coordinate B2 on part cloud data A2 and the object of reference of measuring object under the coordinate system of back at surveying instrument;
5). the coordinate difference and the mean value thereof of each reference point on the selected object of reference before and after the calculating traverse measurement instrument, move front and back coordinate system deviate to obtain surveying instrument;
6). this coordinate system deviate is compensated in the some scale value of measuring object being measured behind the traverse measurement instrument, be under the same coordinate system to guarantee the some cloud coordinate figure that moves fore-and-aft survey.
7) repeat above-mentioned steps 4), 5) with 6), until all cloud datas of this measuring object geometric configuration of acquisition.
Described step 2) in selected object of reference in the surveying instrument usable range in, be near surveying instrument.
Described step 2) if in selected reference point be more than three, any three reference points in the reference point on the then selected object of reference all can not be in one plane.
The invention has the beneficial effects as follows: the present invention utilizes reference point to obtain the coordinate system difference of traverse measurement instrument front and back; Compensate to this difference in the some cloud coordinate figure of measuring behind the traverse measurement instrument, solved actual counter ask in the measuring process can not the traverse measurement coordinate system problem.Use this measuring method can also enlarge the counter usable range of asking surveying instrument, whenever move the usable range that the one-shot measurement instrument just enlarges the one-shot measurement instrument, enlarge the measuring object of surveying instrument, improve the service efficiency of surveying instrument.
Description of drawings
Fig. 1 is the structural drawing of employed commentaries on classics station plate in the embodiment of the invention.
Embodiment
Further specify below in conjunction with the accompanying drawing specific embodiments of the invention.
In the process of how much patterns of scanning object, during the traverse measurement instrument, measurement coordinate system will change.For the cloud data that guarantees the scanning of traverse measurement coordinate system fore-and-aft survey instrument can correctly be stitched together; Before the traverse measurement instrument; A certain fixed object in elder generation's surveying instrument usable range is an object of reference, and we are object of reference to change the station plate here, is reference point with the center of circle of changeing five circular holes on the plate of station; Set this measuring object and need carry out twice measurement and could obtain its complete geometric configuration cloud data, its concrete process is following:
1. after placing surveying instrument and sweep object, how much patterns of sweep object are carried out cloud data extract, obtained the part cloud data A1 of sweep object.
2. be placed in the usable range of surveying instrument changeing the station plate,, can improve the precision of measurement so as far as possible near surveying instrument.
3. use surveying instrument and Survey Software (function with measurement point), recording changes on the plate of station five fixedly coordinate figures in the circular hole center of circle, is designated as
q n (
x Qn ,
y Qn ,
z Qn ) (
n=1,2 ..., 5), five fixedly in the circular hole, the central coordinate of circle of any three circular holes all can not be in one plane.
4. the measurement coordinate system of traverse measurement instrument uses surveying instrument and Survey Software to measure to change identical on the plate of station five fixing coordinate figures in the circular hole center of circle, is designated as
h n (
x Hn ,
y Hn ,
z Hn ) (
n=1,2 ... 5).
5. deviation is arranged, Δ between five point of fixity coordinate figures of twice measurement
x n , Δ
y n , Δ
z n (
n=1,2 ..., 5)
Δ
x n ?=
?x hn ?-
?x qn ，Δ
y n ?=
?y hn ?-
?y qn ，Δ
z n ?=
?z hn ?-
?z qn
6. moving the new measurement coordinate system in back has a deviation delta with respect to the measurement coordinate system before moving
x, Δ
y, Δ
z, wherein order
Δ
x=(Δ
x 1+Δ
x 2+Δ
x 3+Δ
x 4+Δ
x 5)/5
Δ
y=(Δ
y 1+Δ
y 2+Δ
y 3+Δ
y 4+Δ
y 5)/5
Δ
z?=(Δ
z 1+Δ
z 2+Δ
z 3+Δ
z 4+Δ
z 5)/5
7. after the traverse measurement coordinate system, continue to measure how much patterns of sweep object, obtain cloud data A2.
8. the coordinate figure of data A2 mid point
x,
y,
zAll increase Δ
x, Δ
y, Δ
z,, just obtain the cloud data of how much complete patterns then with the A1 data splicing.
Utilize the anti-measuring method of asking of the present invention, can solve the problem of the correct splicing of cloud data under the different measuring coordinate system well, thus solved actual counter ask in the measuring process can not the traverse measurement coordinate system problem.Use this measuring method can enlarge the counter usable range of asking surveying instrument, whenever move the usable range that the one-shot measurement instrument just enlarges the one-shot measurement instrument, enlarge the measuring object of surveying instrument, improve the service efficiency of surveying instrument.
Claims (3)
1. anti-measuring method of asking, it is characterized in that: the concrete steps of this method are following:
1). the measuring object that need carry out twice measurement at least is fixed on a certain position, with surveying instrument how much patterns of this measuring object is carried out cloud data and extracts, to obtain the part cloud data A1 of measuring object;
2). choose that a fixing arbitrarily object is an object of reference in the surveying instrument measurement range, and choose at least and a bit be reference point in the object of reference;
3). with surveying instrument the reference point on the selected object of reference is measured, to obtain the coordinate figure B1 of reference point under this coordinate system;
4). traverse measurement instrument, the and respectively reference point on measuring object and the selected object of reference being measured, to obtain moving reference point coordinate B2 on part cloud data A2 and the object of reference of measuring object under the coordinate system of back at surveying instrument;
5). the coordinate difference and the mean value thereof of each reference point on the selected object of reference before and after the calculating traverse measurement instrument, move front and back coordinate system deviate to obtain surveying instrument;
6). this coordinate system deviate is compensated in the some scale value of measuring object being measured behind the traverse measurement instrument, be under the same coordinate system to guarantee the some cloud coordinate figure that moves fore-and-aft survey.
7). repeat above-mentioned steps 4), 5) with 6), until all cloud datas of this measuring object geometric configuration of acquisition.
2. the anti-measuring method of asking according to claim 1 is characterized in that: described step 2) selected object of reference in the surveying instrument usable range in, be near surveying instrument.
3. the anti-measuring method of asking according to claim 1 and 2 is characterized in that: described step 2) if in selected reference point be more than three, any three reference points in the reference point on the then selected object of reference all can not be in one plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210007308XA CN102692202A (en) | 2012-01-11 | 2012-01-11 | Reverse measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210007308XA CN102692202A (en) | 2012-01-11 | 2012-01-11 | Reverse measurement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102692202A true CN102692202A (en) | 2012-09-26 |
Family
ID=46857816
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|---|---|---|---|
| CN201210007308XA Pending CN102692202A (en) | 2012-01-11 | 2012-01-11 | Reverse measurement method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101246595A (en) * | 2008-02-01 | 2008-08-20 | 黑龙江科技学院 | Multi-view point data splitting method of optical three-dimensional scanning system |
| JP4491687B2 (en) * | 2005-04-21 | 2010-06-30 | パルステック工業株式会社 | Coordinate transformation function correction method |
| CN101950433A (en) * | 2010-08-31 | 2011-01-19 | 东南大学 | Building method of transformer substation three-dimensional model by using laser three-dimensional scanning technique |
-
2012
- 2012-01-11 CN CN201210007308XA patent/CN102692202A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4491687B2 (en) * | 2005-04-21 | 2010-06-30 | パルステック工業株式会社 | Coordinate transformation function correction method |
| CN101246595A (en) * | 2008-02-01 | 2008-08-20 | 黑龙江科技学院 | Multi-view point data splitting method of optical three-dimensional scanning system |
| CN101950433A (en) * | 2010-08-31 | 2011-01-19 | 东南大学 | Building method of transformer substation three-dimensional model by using laser three-dimensional scanning technique |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Application publication date: 20120926 |