CN108469230A - A kind of wood single-plate deformation measurement method based on 3 D laser scanning - Google Patents
A kind of wood single-plate deformation measurement method based on 3 D laser scanning Download PDFInfo
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- CN108469230A CN108469230A CN201810201797.XA CN201810201797A CN108469230A CN 108469230 A CN108469230 A CN 108469230A CN 201810201797 A CN201810201797 A CN 201810201797A CN 108469230 A CN108469230 A CN 108469230A
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- deformation
- veneer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- General Physics & Mathematics (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of wood single-plate deformation measurement method based on 3 D laser scanning, includes the following steps：(1) it arranges positioning punctuate at the wood single-plate back side of deformation, the wood single-plate of deformation is scanned using non-contact 3-D laser scanner；(2) edit operations such as a cloud noise processed, removal isolated island, trimming are carried out to obtained three-dimensional grid using mating scanning software, obtains visual cripple timber veneer model；(3) three-dimensional coordinate of scanning software record location punctuate is utilized；(4) three-dimensional coordinate for positioning punctuate is handled using 3-D graphic geometric transformation；(5) scattered data points triangulation methodology constructing curve is utilized；(6) it is limited into row bound using modified positioning punctuate coordinate pair constructing curve, establishes deformation veneer contour map；(7) deformation data of institute's survey veneer is obtained according to wood single-plate deformation evaluating index.The present invention realize measuring and calculating wood single-plate deformation visualize, it is rapid and precision.
Description
Technical field
The present invention relates to a kind of wood single-plate deformation measurement method based on 3 D laser scanning, belongs to log detection science
With technical field.
Background technology
The size of timber rotary cut venner deformation, drying process and processing technology to timber rotary cut venner have larger shadow
It rings, traditional wood single-plate deformation extent measurement is to use for reference the test method of plank degreeof tortuosity, measures veneer surface and plane
Maximum deviation height and tested single board the ratio between width, since the deformation of veneer is not uniform, the size of deformation exists
Each having differences property of position of veneer, this test method can only measure veneer marginal portion, be unable to measure veneer
Whole deformation, and directly contacted with tested single board using steel ruler as survey tool when measuring, there is the interference of external force.Therefore it surveys
The deformation data measured out can not react veneer overall deformation completely.
Invention content
The defect that deposited ability is measured for traditional wood single-plate deformation extent, the present invention provides one kind to be swashed based on three-dimensional
The wood single-plate deformation measurement method of optical scanning.
To achieve the above object, it is achieved through the following technical solutions：A kind of timber list based on 3 D laser scanning
Plate deformation measurement method, includes the following steps：
(1) it scans：In the wood single-plate back side of deformation arrangement positioning punctuate, non-contact 3-D laser scanner pair is used
The wood single-plate of deformation is scanned；
(2) cripple timber veneer model is obtained：A cloud noise is carried out to obtained three-dimensional grid using mating scanning software
The edit operations such as processing, removal isolated island, trimming, obtain visual cripple timber veneer model；
(3) positioning punctuate coordinate is obtained：Utilize the three-dimensional coordinate of scanning software record location punctuate；
(4) coordinate data is handled：The three-dimensional coordinate for positioning punctuate is handled using 3-D graphic geometric transformation；
(5) constructing curve：Utilize Cline and Renka scattered data points triangulation methodology constructing curves；
(6) deformation veneer contour map is established：It is limited into row bound using modified positioning punctuate coordinate pair constructing curve,
Establish deformation veneer contour map；
(7) deformation data is obtained：The deformation data of institute's survey veneer is obtained according to wood single-plate deformation evaluating index.
The wood single-plate is any one fast growing wood veneer in middle mountain China fir, poplar, Eucalyptus, masson pine, pine.
The positioning punctuate is arranged in loose side.
Coordinate data processing the specific steps are：
If the positioning punctuate of record has n, any in the positioning punctuate wherein on veneer quadrangle is M, and point M is translated
To coordinate origin, remaining coordinate points corresponds to translation, is rotated in the forward direction punctuate is positioned on point M veneer band deflections to xz with z-axis
Face, remaining coordinate points correspond to rotation, and by point M, diagonally upper positioning punctuate is rotated in the forward direction with x-axis to the faces xy, remaining coordinate points corresponds to rotation
Turn.
The constructing curve is to be ranked sequentially each point with square incremental at a distance from x coordinate system smallest point, specifically
Implementation method is：
1) pre- sequence；2) initial Thiessen trigonometric ratios are constructed；3) a new point k is often added, looks for borderline point N1、
N2So that counterclockwise from N1To N2The boundary undergone is all visible from k；4) by k and counterclockwise from N1
To N2The boundary undergone is connected, and optimizes obtained trigonometric ratio Tk, final to establish accurate deformation veneer curved surface.
The foundation deformation veneer contour map is to utilize modified positioning punctuate coordinate pair constructing curve into row bound
Limitation, removal pass through in the curved surface that Cline and Renka scattered data points triangulation methodologies construct beyond detection veneer model
The part enclosed.
The wood single-plate deformation evaluating index is to deform maximum height and tested single board most by calculating tested single board
The ratio of small catercorner length is worth to, and calculation formula is：
In formula：D (%) deformation extent；H veneers deform maximum height；L veneer minimum catercorner lengths.
The present invention is based on the deformations of three dimension laser scanning surreying wood single-plate, can quickly obtain visual cripple timber veneer
Model, can accurately measure whole wood single-plate deformation size, realize measuring and calculating wood single-plate deformation visualize, it is rapid and
Precision.
Advantageous effect：
1. the present invention uses non-contact 3-D laser scanner, any external force is not applied to wood single-plate, ensures deformation
The accuracy of data.
2. the present invention is handled the three-dimensional coordinate for positioning punctuate using 3-D graphic geometric transformation, and utilizes Cline
And Renka scattered data points triangulation methodology constructing curves can compare veneer deformation size under similarity condition
Compared with.
3. the present invention is handled data by carrying out 3 D laser scanning to deformation veneer, may be implemented to wood
The visualizing of material veneer deformation detection, rapid and precision, can provide strong technology for the Performance Evaluation of wood single-plate
Support.
Description of the drawings
Fig. 1 is the flow chart of the method for the present invention.
Fig. 2 is wood single-plate image before embodiment scanning.
Fig. 3 is that embodiment arranges single-panel image after positioning punctuate.
Fig. 4 is the threedimensional model design sketch obtained after embodiment scans.
Fig. 5 is the original elements of a fix distribution map of embodiment.
Fig. 6 is the revised elements of a fix distribution map of embodiment.
Fig. 7 is obtained deformation contour map after embodiment data processing.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described further.
A kind of wood single-plate deformation measurement method based on 3 D laser scanning, includes the following steps：
(1) positioning punctuate is arranged at the wood single-plate back side of deformation, using non-contact 3-D laser scanner to deformation
Wood single-plate be scanned；
(2) volumes such as a cloud noise processed, removal isolated island, trimming are carried out to obtained three-dimensional grid using mating scanning software
Operation is collected, visual cripple timber veneer model is obtained；
(3) three-dimensional coordinate of mating scanning software record location punctuate is utilized；
(4) three-dimensional coordinate for positioning punctuate is handled using 3-D graphic geometric transformation；
(5) Cline and Renka scattered data points triangulation methodology constructing curves are utilized；
(6) it is limited into row bound using modified positioning punctuate coordinate pair constructing curve, establishes deformation veneer contour map；
(7) wood single-plate deformation evaluating index is that the veneer of certain specification deforms maximum height and veneer minimum diagonal line length
The ratio of degree.
A method of based on 3 D laser scanning measuring and calculating wood single-plate deformation, the wood single-plate is middle mountain China fir, poplar
The fast growing woods veneer such as wood, Eucalyptus, masson pine, pine.
A method of based on 3 D laser scanning measuring and calculating wood single-plate deformation, the positioning punctuate is reflecting sign
Point, diameter 10mm, reflective diameter 6mm are easy to operate, and positioning punctuate is evenly arranged with four sides per 100mm in veneer quadrangle, at
Latticed, positioning punctuate is arranged in loose side；Non-contact 3-D laser scanner resolution ratio is 0.05mm, and accuracy is
0.03mm。
A method of it is described to utilize mating scanning software to obtaining based on 3 D laser scanning measuring and calculating wood single-plate deformation
Three-dimensional grid carry out a cloud noise processed, removal isolated island, the edit operations such as trimming, obtain visual cripple timber veneer mould
Type cripple timber veneer model is Visualization Model, cannot deform to veneer and accurately be measured.
A method of it is described to utilize 3-D graphic geometric transformation pair based on 3 D laser scanning measuring and calculating wood single-plate deformation
The three-dimensional coordinate of positioning punctuate is handled, and specific processing step converts in the following manner：
If the positioning punctuate of record has n, in the positioning punctuate wherein on veneer quadrangle is some M, and point M is moved to
Coordinate origin, remaining coordinate points correspond to translation, are rotated in the forward direction punctuate is positioned on point M veneer band deflections to the faces xz with z-axis,
Remaining coordinate points corresponds to rotation, and by point M, diagonally upper positioning punctuate is rotated in the forward direction with x-axis to the faces xy, remaining coordinate points corresponds to rotation.
A method of based on 3 D laser scanning measuring and calculating wood single-plate deformation, utilizing Cline and Renka numbers at random
Strong point triangulation methodology constructing curve, method are ranked sequentially with square incremental at a distance from x coordinate system smallest point
Each point, concrete methods of realizing formula：1) pre- sequence；2) initial Thiessen trigonometric ratios are constructed；3) a new point k is often added, looks for
Seek borderline point N1、N2So that counterclockwise from N1To N2The boundary undergone is all visible from k；4) by k with press
Counterclockwise from N1To N2The boundary undergone is connected, and optimizes obtained trigonometric ratio Tk.Purpose is to establish accurate deformation list
Plate curved surface.
A method of based on 3 D laser scanning measuring and calculating wood single-plate deformation, which is characterized in that utilize modified positioning
Punctuate coordinate pair constructing curve is limited into row bound, and removal passes through Cline and Renka scattered data points triangulation methodologies
Part beyond detection veneer range in the curved surface of construction.
A kind of evaluation index based on 3 D laser scanning measuring and calculating wood single-plate deformation, measuring and calculating wood single-plate deformation size
Specific method is：Calculate the ratio of veneer the deformation maximum height and tested single board minimum catercorner length of certain specification, meter
Calculating formula is：
In formula：D deformation extents (%)；H veneers deform maximum height (mm)；L veneer minimum catercorner lengths (mm).
Embodiment
As shown in Fig. 2, middle mountain China fir log is cut by mountain China fir rotary cut venner as test object in being used in the present embodiment
1.3m, peeling, green moisture content about 146% are peeled into veneer on rotary trunk-layer stripping machine without clamper, and wherein veneer nominal thickness is 2mm.
In diameter 300mm-280mm, 150mm-130mm, 80mm-50mm during rounding, randomly select respectively 1270mm ×
870mm veneers several, cut into 400mm × 400mm test specimens, be respectively labeled as A classes, B classes, C classes from outside to inside.In natural shape
Dry under state, drying distortions under natural conditions, it is 18% that Veneer moisture is measured before testing.
As shown in figure 3, being uniformly distributed diameter 10mm, reflective diameter 6mm per 100mm in loose side veneer quadrangle and four sides
Special light reflecting punctuate, at latticed.Deformation veneer is scanned using non-contact 3-D laser scanner, contactless three
Dimension laser scanner resolution ratio is 0.05mm, accuracy 0.03mm.
As shown in figure 4, using mating scanning software to obtained three-dimensional grid carry out a cloud noise processed, removal isolated island,
The edit operations such as trimming.Deformation veneer model after being scanned.
The three-dimensional coordinate of software kit record location punctuate is utilized after the completion of scanning, as shown in figure 5, the positioning mark of record
Point initial three-dimensional coordinate distribution is irregular, so at the three-dimensional coordinate using 3-D graphic geometric transformation to positioning punctuate
Reason, specific processing step convert in the following manner：
If the positioning punctuate of record has 25, any in the positioning punctuate wherein on veneer quadrangle is M, and point M is put down
Move to coordinate origin, remaining coordinate points correspond to translation, will on point M veneer band deflections position punctuate with z-axis rotate in the forward direction to
The faces xz, remaining coordinate points correspond to rotation, and by point M, diagonally upper positioning punctuate is rotated in the forward direction with x-axis to the faces xy, remaining coordinate points corresponds to
Rotation obtains revised elements of a fix point distribution map as shown in Figure 6.
Using Cline and Renka scattered data points triangulation methodology constructing curves, method be with x coordinate system
The square incremental of the distance of smallest point is ranked sequentially each point, concrete methods of realizing formula：1) pre- sequence；2) construction is initial
Thiessen trigonometric ratios；3) a new point k is often added, looks for borderline point N1、N2So that counterclockwise from N1To N2Institute
The boundary of experience is all visible from k；4) by k and counterclockwise from N1To N2The boundary undergone is connected, optimization gained
The trigonometric ratio T arrivedk.Purpose is to establish accurate deformation veneer curved surface.
It is limited into row bound using modified positioning punctuate coordinate pair constructing curve, removal passes through Cline and Renka
Part beyond detection veneer range in the curved surface of scattered data points triangulation methodology construction is established as shown in fig. 7, deformation is single
Plate contour map.
To treated, image is analyzed in the present embodiment, extracts maximum height difference and tested single board in contour map
The data of minimum catercorner length, table 1 are the deformation extent of middle mountain China fir veneer in embodiment as a result, table 2 is mountain in conventional method
China fir veneer deformation extent is as a result, from the point of view of Comparative result, the veneer deformation extent coefficient of variation A classes measured using this method are
3.43%, B class are that 4.08%, C classes are 2.05%, and the deformation extent coefficient of variation measured compared with conventional method compares (A classes
8.58%, B class 9.62%, C classes 14.60%), the coefficient of variation is small, illustrates the veneer deformation extent accuracy of this method measurement more
It is high.
Mountain China fir veneer deformation extent result in table 1
Mountain China fir veneer deformation extent result in 2 conventional method of table
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto.
In presently disclosed technical scope, the change or replacement that can be readily occurred in should all be covered those skilled in the art
Within protection scope of the present invention.Therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (7)
1. a kind of wood single-plate deformation measurement method based on 3 D laser scanning, which is characterized in that include the following steps：
(1) it scans：In the wood single-plate back side of deformation arrangement positioning punctuate, using non-contact 3-D laser scanner to deformation
Wood single-plate be scanned；
(2) cripple timber veneer model is obtained：Using mating scanning software to obtained three-dimensional grid carry out a cloud noise processed,
The edit operations such as isolated island, trimming are removed, visual cripple timber veneer model is obtained；
(3) positioning punctuate coordinate is obtained：Utilize the three-dimensional coordinate of scanning software record location punctuate；
(4) coordinate data is handled：The three-dimensional coordinate for positioning punctuate is handled using 3-D graphic geometric transformation；
(5) constructing curve：Utilize Cline and Renka scattered data points triangulation methodology constructing curves；
(6) deformation veneer contour map is established：It is limited, is established into row bound using modified positioning punctuate coordinate pair constructing curve
Deform veneer contour map；
(7) deformation data is obtained：The deformation data of institute's survey veneer is obtained according to wood single-plate deformation evaluating index.
2. the wood single-plate deformation measurement method based on 3 D laser scanning as described in claim 1, which is characterized in that described
Wood single-plate be middle mountain China fir, poplar, Eucalyptus, masson pine, any one fast growing wood veneer in pine.
3. the wood single-plate deformation measurement method based on 3 D laser scanning as described in claim 1, which is characterized in that described
Positioning punctuate be arranged in loose side.
4. the wood single-plate deformation measurement method based on 3 D laser scanning as described in claim 1, which is characterized in that described
Coordinate data processing the specific steps are：
If the positioning punctuate of record has n, any in the positioning punctuate wherein on veneer quadrangle is M, and point M is moved to seat
Origin is marked, remaining coordinate points corresponds to translation, is rotated in the forward direction punctuate is positioned on point M veneer band deflections to the faces xz with z-axis,
Remaining coordinate points correspond to rotation, and by point M, diagonally upper positioning punctuate is rotated in the forward direction with x-axis to the faces xy, remaining coordinate points corresponds to rotation.
5. the wood single-plate deformation measurement method based on 3 D laser scanning as described in claim 1, which is characterized in that described
Constructing curve be that each point is ranked sequentially with square incremental at a distance from x coordinate system smallest point, concrete methods of realizing is：
1) pre- sequence；2) initial Thiessen trigonometric ratios are constructed；3) a new point k is often added, looks for borderline point N1、N2Make
It obtains counterclockwise from N1To N2The boundary undergone is all visible from k；4) by k and counterclockwise from N1To N2
The boundary undergone is connected, and optimizes obtained trigonometric ratio Tk, final to establish accurate deformation veneer curved surface.
6. the wood single-plate deformation measurement method based on 3 D laser scanning as described in claim 1, which is characterized in that described
Foundation deformation veneer contour map be using modified positioning punctuate coordinate pair constructing curve into row bound limitation, removal passes through
Part beyond detection veneer range in the curved surface of Cline and Renka scattered data points triangulation methodologies construction.
7. the wood single-plate deformation measurement method based on 3 D laser scanning as described in claim 1, which is characterized in that described
Wood single-plate deformation evaluating index, be to deform maximum height and tested single board minimum catercorner length by calculating tested single board
Ratio be worth to, calculation formula is：
In formula：D (%) deformation extent；H veneers deform maximum height；L veneer minimum catercorner lengths.
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Cited By (2)
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| CN110968040A (en) * | 2019-12-18 | 2020-04-07 | 湖南戈人自动化科技有限公司 | Program generation method of machining track for mechanical numerical control |
| CN114274294A (en) * | 2021-11-25 | 2022-04-05 | 三江学院 | Wood information extracting and binding all-in-one machine and binding method thereof |
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| US20100284609A1 (en) * | 2008-02-05 | 2010-11-11 | CENTRE DE RECHERCHE INDUSTRIELLE DU QUéBEC | Apparatus and method for measuring size distribution of granular matter |
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| CN108469230B (en) | 2020-02-14 |
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