CN107784691A - Curved boundary approximating method based on steel member feature - Google Patents
Curved boundary approximating method based on steel member feature Download PDFInfo
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- CN107784691A CN107784691A CN201610726627.4A CN201610726627A CN107784691A CN 107784691 A CN107784691 A CN 107784691A CN 201610726627 A CN201610726627 A CN 201610726627A CN 107784691 A CN107784691 A CN 107784691A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/30—Polynomial surface description
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Abstract
The present invention relates to a kind of Curved boundary approximating method based on steel member feature, step 1：Website is set and scanning, sets the quantity of website and position, face component to be simultaneously scanned component respectively according to website according to the feature of steel member, obtains the cloud data with Curved boundary information；Step 2：The reverse modeling of each site cloud data, the cloud data of each website is taken successively, carry out points cloud processing, each cloud data is converted into tri patch, then carry out reverse modeling, the known features generation Curved boundary based on steel member；Step 3：Respectively stand the feature registration of reverse model, the reverse model that the cloud data for each website for having generated Curved boundary is obtained, registration is carried out by a cloud datum mark, does accurate amendment while registering to Curved boundary.The present invention is fitted modeling one by one with " single site cloud " data with feature, then carries out registration to the model of fitting.The precision of Curved boundary identification is increased substantially, also saves many times.
Description
Technical field
The present invention relates to a kind of Curved boundary approximating method, specifically the Curved boundary fitting side based on steel member feature
Method.
Background technology
The operating process of three-dimensional reverse modeling technology is at present：Pass through scanner multi-site gathered data, first registration scanning
Multi-site cloud data, then march edge fitting and reverse modeling again.Point cloud refers to pass through measurement in reverse-engineering
The point data set on the product appearance surface that instrument obtains；Due in cloud data gatherer process, it may appear that grating according to less than
Position, scanner precision be not high, processing technology requires a series of externalities such as chamfering, plus in registration process, data base
Also deviation is had, the lap for putting cloud obscures, and " atomization " phenomenon particularly occurs on Curved boundary.This inversely builds to steel member
Very big obstruction is molded as, because steel member is true on preassembling registration stage, the border of heavy dependence Curved boundary especially positioning hole
It is fixed.It is larger according to steel member entity, but the characteristics of in feature set, the part that component specification is concentrated only is obtained in scanning process,
Such as interface, the place of bolt positioning hole.Avoid that the entire scan time is long, scans that to carry out some clouds of low quality.
The content of the invention
It is contemplated that the defects of overcoming prior art, there is provided a kind of Curved boundary approximating method based on steel member feature,
Solve the problems, such as that Curved boundary identification is difficult in steel member three-dimensional reverse modeling technology.
In order to solve the above-mentioned technical problem, the present invention is realized in：
A kind of Curved boundary approximating method based on steel member feature, it is characterised in that it comprises the following steps：
Step 1：Website is set and scanning
The quantity of website and position, face component is set simultaneously to be swept component respectively according to website according to the feature of steel member
Retouch, obtain the cloud data with Curved boundary information；
Step 2：The reverse modeling of each site cloud data
The cloud data of each website is taken successively, is carried out points cloud processing, each cloud data is converted into tri patch, then carry out
Reverse modeling, the known features generation Curved boundary based on steel member；
Step 3：Respectively stand the feature registration of reverse model
The reverse model that the cloud data for each website for having generated Curved boundary is obtained, registration is carried out by a cloud datum mark,
Accurate amendment is done while registering to Curved boundary.
The described Curved boundary approximating method based on steel member feature, it is characterised in that the steel member described in step 1
Feature for interface, link position, the feature of band member, mounting hole.
The described Curved boundary approximating method based on steel member feature, it is characterised in that the points cloud processing refers to noise and gone
Remove, point cloud reparation.
The beneficial effects of the invention are as follows：Modeling is fitted one by one with " single site cloud " data with feature, then to fitting
Model carries out registration.The precision of Curved boundary identification is increased substantially, also saves many times.
Brief description of the drawings
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings：
Fig. 1 is the flow chart of the present invention.
Fig. 2 is the multistation spot scan schematic diagram of component.
Embodiment
It is larger according to steel member entity, but only obtain what component specification was concentrated the characteristics of in feature set, in scanning process
Part, such as interface, the place of bolt positioning hole.Avoid that the entire scan time is long, scans that to carry out some clouds of low quality.Based on
Primary member feature, using " registration after being first fitted " method, Curved boundary can be quickly recognized, is completed again in matching process once smart
The amendment of degree.It is especially very big to the recognition reaction on the border of mounting hole to realizing the curve reestablishing with feature Curved boundary.Base
In the Curved boundary approximating method of steel member feature, apply and have some limitations in other reverse engineerings.
The present invention is the quick surface boundary approximating method based on building iron component specification, takes single site cloud and locates one by one
Manage, method registering again after surface forming.First, just targetedly to the ground in feature set since being gathered cloud data
Side, such as interface, the component position multistation scanning of mounting hole site, draw targetedly cloud data；Then, in point-cloud fitting rank
Section, it is known that in the case of steel member Curved boundary feature, by the fitting to single site cloud, compare clearly border with regard to that can draw
Line；Finally, the reverse model that each site cloud fits is registrated to together by a cloud datum mark again, and Curved boundary information is obtained into one
The amendment of step, the reverse Model registration of Curved boundary is completed, so as to reach the purpose of whole component Surface Reconstruction.In more than summarizing
Hold and be mainly fitted three key steps comprising points cloud processing, Curved boundary extraction, feature registration.
As shown in Figure 1：A kind of Curved boundary approximating method based on steel member feature, it is characterised in that it includes following step
Suddenly：
Step 1：Website is set and scanning
According to the quantity of the feature of steel member setting website and position, N represents the total quantity of website in figure, and i represents single website,
A website i is selected first, and component is simultaneously scanned, obtained with Curved boundary information by face component respectively according to website is single
Cloud data；Emphasis scans the position of link position and band member feature during scanning, as far as possible face component, especially band mounting hole
Part；By taking Fig. 2 as an example, component will be illustrated, be scanned respectively according to tetra- websites of a, b, c, d, obtain band Curved boundary information
Cloud data.
Step 2：The reverse modeling of each site cloud data
The cloud data of each website is taken successively, carries out carrying out a series of points cloud processings such as noise removal, deletion, point cloud reparation,
Each cloud data is converted into triangular facet, then all triangular facets are formed into tri patch, then carries out reverse modeling, based on steel
The known features generation Curved boundary of component；
Step 3：Respectively stand the feature registration of reverse model
The reverse model that the cloud data for each website for having generated Curved boundary is obtained, registration is carried out by a cloud datum mark,
Accurate amendment can also be done after registration to Curved boundary.
Claims (3)
1. a kind of Curved boundary approximating method based on steel member feature, it is characterised in that it comprises the following steps：
Step 1：Website is set and scanning
The quantity of website and position, face component is set simultaneously to be swept component respectively according to website according to the feature of steel member
Retouch, obtain the cloud data with Curved boundary information；
Step 2：The reverse modeling of each site cloud data
The cloud data of each website is taken successively, is carried out points cloud processing, each cloud data is converted into tri patch, then carry out
Reverse modeling, the known features generation Curved boundary based on steel member；
Step 3：Respectively stand the feature registration of reverse model
The reverse model that the cloud data for each website for having generated Curved boundary is obtained, registration is carried out by a cloud datum mark,
Accurate amendment is done while registering to Curved boundary.
2. the Curved boundary approximating method according to claim 1 based on steel member feature, it is characterised in that institute in step 1
The feature for the steel member stated is interface, link position, the feature of band member, mounting hole.
3. the Curved boundary approximating method according to claim 1 based on steel member feature, it is characterised in that at described cloud
Reason refers to noise removal, point cloud reparation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610726627.4A CN107784691A (en) | 2016-08-26 | 2016-08-26 | Curved boundary approximating method based on steel member feature |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610726627.4A CN107784691A (en) | 2016-08-26 | 2016-08-26 | Curved boundary approximating method based on steel member feature |
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| CN107784691A true CN107784691A (en) | 2018-03-09 |
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| CN201610726627.4A Pending CN107784691A (en) | 2016-08-26 | 2016-08-26 | Curved boundary approximating method based on steel member feature |
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Citations (5)
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|---|---|---|---|---|
| US20090136114A1 (en) * | 2007-11-27 | 2009-05-28 | General Electric Company | Multi-modality inspection method with data validation and data fusion |
| CN102136155A (en) * | 2010-01-27 | 2011-07-27 | 首都师范大学 | Object elevation vectorization method and system based on three dimensional laser scanning |
| CN103530441A (en) * | 2013-09-12 | 2014-01-22 | 广东电网公司电力科学研究院 | Method for three-dimensional modeling of steam turbine set through three-dimensional laser scanning technology |
| CN104123751A (en) * | 2014-07-24 | 2014-10-29 | 福州大学 | Combined type measurement and three-dimensional reconstruction method combing Kinect and articulated arm |
| CN105574930A (en) * | 2015-12-18 | 2016-05-11 | 中国科学院自动化研究所 | Chinese character three-dimensional data acquisition and processing system |
-
2016
- 2016-08-26 CN CN201610726627.4A patent/CN107784691A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| US20090136114A1 (en) * | 2007-11-27 | 2009-05-28 | General Electric Company | Multi-modality inspection method with data validation and data fusion |
| CN102136155A (en) * | 2010-01-27 | 2011-07-27 | 首都师范大学 | Object elevation vectorization method and system based on three dimensional laser scanning |
| CN103530441A (en) * | 2013-09-12 | 2014-01-22 | 广东电网公司电力科学研究院 | Method for three-dimensional modeling of steam turbine set through three-dimensional laser scanning technology |
| CN104123751A (en) * | 2014-07-24 | 2014-10-29 | 福州大学 | Combined type measurement and three-dimensional reconstruction method combing Kinect and articulated arm |
| CN105574930A (en) * | 2015-12-18 | 2016-05-11 | 中国科学院自动化研究所 | Chinese character three-dimensional data acquisition and processing system |
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| 邓念武等: ""实物逆向工程中全站扫描仪精度分析"", 《测绘通报》 * |
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Application publication date: 20180309 |
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