CN107388962A - A kind of on-line measuring device and detection method of wooden boards warpage - Google Patents
A kind of on-line measuring device and detection method of wooden boards warpage Download PDFInfo
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- CN107388962A CN107388962A CN201710545221.0A CN201710545221A CN107388962A CN 107388962 A CN107388962 A CN 107388962A CN 201710545221 A CN201710545221 A CN 201710545221A CN 107388962 A CN107388962 A CN 107388962A
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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
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/046—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring width
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses the on-line measuring device of oblique fire formula wooden boards warpage, including transfer station, generating laser, support, face battle array industrial camera, support bridge-type is erected in transfer station, along the direction of transfer of transfer station, generating laser and face battle array industrial camera are set on the support above transfer station successively, and described laser transmitter projects to wooden boards surface to be detected in transfer station light source through wooden boards to be detected reflection after quilt cover battle array industrial camera receive, and face battle array industrial camera connects with a computer simultaneously, the incident laser line of described laser transmitter projects and the optical axis angle in 90 ° of face battle array industrial camera, and described incident light is oblique fire, 0 90 ° of ＜ incidence angles ＜.Compared with artificial detection method, laser on-line checking has the advantages that efficiency high, precision is high for detection means and method of the present invention；Measured simultaneously using range of triangle method, measurement accuracy improves, and realizes industrial on-line checking.
Description
Technical field
The present invention relates to a kind of detection means and detection method, more particularly, to a kind of on-line checking of wooden boards warpage
Device and detection method, belong to timber processing and manufacturing field.
Background technology
The chief component of timber is cellulose, hemicellulose and lignin, and vapor, moisture to surrounding have sufficiently
Compatibility, create the natural moisture pick-up properties of timber；The organism that timber is made up of cell, include various capillarys
Pipe, has plasticity.To sum up reason, wooden boards or woodwork can produce drying shrinkage with the change of ambient relative humidity
With bulking phenomenon.Because timber is a kind of heterogeneous anisotropic material, drying shrinkage also has anisotropic with bulking, is placed in certainly
Wooden boards in right environment can produce warpage, and the wooden boards angularity in different humiture environment is different.
Fig. 1-Fig. 2 is angularity measurement figure.As depicted in figs. 1 and 2：It is real according to standard GB/T/T 15036.2-2009
The method of inspection of angularity in timber floor：Floor surface is placed on upwards on horizontal experiment table top, straight edge ruler or steel plate
Chi vertically abuts the long side of floor two, and maximum action h is measured with clearance gaugemax, it is accurate to 0.01mm.Maximum action hmaxSurveyed with floor
The ratio of width ω is width angularityfωIt is expressed as a percentage, is accurate to 0.01%.
Traditional detection is often completed by artificial, and tester determines the maximum of plank warpage with clearance gauge or other measurers
Chord length, according to measurement result, manual calculations wooden boards angularity.Workload is big, and efficiency is low, is influenceed by subjective measurement, can not
Carry out online efficient detection, it is difficult to which input industry quantifies detection.
The content of the invention
In order to overcome prior art problem, it is an object of the invention to provide a kind of measuring speed is fast, precision is high, operation is simple
The on-line measuring device and detection method of single wooden boards warpage.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of on-line measuring device of oblique fire formula wooden boards warpage, including transfer station, generating laser, support, face battle array
Industrial camera, support bridge-type are erected in transfer station, along the direction of transfer of transfer station, are set successively on the support above transfer station
Put generating laser and face battle array industrial camera, and described laser transmitter projects are to wooden boards surface to be detected in transfer station
Light source through wooden boards to be detected reflection after quilt cover battle array industrial camera receive, and face battle array industrial camera simultaneously with a computer connect
It is logical, described the incident laser line of laser transmitter projects and the optical axis angle in 90 ° of face battle array industrial camera, and described incidence
Light is slants, 0 90 ° of ＜ incidence angles ＜.
Further, the wooden boards warpage of the on-line measuring device based on above-mentioned oblique fire formula wooden boards warpage it is online
Detection method, comprise the following steps：
S1：Generating laser launches LASER Light Source to wooden boards to be detected in transfer station, and LASER Light Source is through to be detected
By the lens of industrial camera after the reflection of wooden boards surface, imaging, institute are then received by the optical sensor positioned at lens rear portion
The incident laser line for the laser transmitter projects stated and the optical axis angle in 90 ° of face battle array industrial camera, and described incident light is
Oblique fire, 0 90 ° of ＜ incidence angles ＜；
S2：The photosignal received is converted into data signal by described optical sensor；
S3：Data collecting card in computer collects the data signal of industrial camera, and by the processing software of computer
The warp image profile of wooden boards to be detected is obtained after processing, tested section of wooden boards are obtained according to warp image profile information
The thickness value pixel and width value pixel in face, and pixel unit is converted into long measure, calculate maximum action hmaxWith
The actual measurement width ω of wooden boards to be detected, obtains angularity fω,
And in S1 steps, generating laser to the LASER Light Source that tested wood-based product launches be fan laser light source, and
The striation that wooden boards surface to be detected is formed is in-line striation.
And in S3 steps, maximum action hmaxCalculating process be：
X=ky (I)
In public formula (I), x is the detection thickness value of wooden boards to be detected；Y is wood based panel to be detected in the battle array industrial camera of face
The skew on material surface and benchmark bottom surface, y show as the thickness of wooden boards in warp image profile, and k is spatial resolution, and
Described k is that the skew y on wooden boards surface to be detected and benchmark bottom surface in the battle array industrial camera of face detects thickness with wooden boards
Value x linear relationship coefficient, by public formula (I), obtains xmaxAnd xmin, and hmax=xmax-xmin。
Wherein, above-mentioned k numerical formula is：In k numerical formula, θ is Laser emission
The incidence angle of device, β are the angle of optical axis and the wooden boards surface normal to be detected of face battle array industrial camera, and f is camera focus, L
The object distance of battle array industrial camera imaging in face when measurement thickness is 0 is represented, θ+β=90 °, so sin (θ+β) is fixed value 1, and is treated as
As system is fixed, the lens location of face battle array industrial camera is fixed and inclination angle determines, generating laser highly determines away from transfer station, L,
F, θ is fixed value, then k is also fixed value.
And the calculating process of the actual measurement width ω of wooden boards to be detected is then：
ω=k2′W' (Ⅱ)
In formula (II), described ω be wooden boards to be detected developed width value, k2' it is that wooden boards to be detected are wide
Spend the spatial resolution in direction, W' is the width value of wooden boards to be detected showed in width profile image, described k2' be
Constant.
And described k'2=k2, in formula：k2For the spatial resolution that thickness is width at 0, when imaging system is fixed,
The object distance and image distance that measurement thickness is imaged when being 0 are fixed value, then k2For fixed value.
Beneficial effects of the present invention are：Compared with artificial detection method, laser exists for detection means and method of the present invention
The advantages that line detection has efficiency high, and precision is high；Measured simultaneously using range of triangle method, measurement accuracy improves, and realizes
Industrial on-line checking.
Brief description of the drawings
Fig. 1-Fig. 2 is angularity measurement figure；
Fig. 3 is the system structure diagram of on-line measuring device of the present invention；
Fig. 4 is the structural representation of on-line measuring device of the present invention；
Fig. 5 is wooden boards warpage testing process schematic diagram；
Fig. 6 is that wooden boards warpage detects basic principle schematic；
Fig. 7 is the schematic diagram of width detection；
Fig. 8 is detection reference plane image；
Fig. 9 is wooden boards warpage detection image；
Line image centered on Figure 10；
Figure 11 is LASER Light Source incidence angle schematic diagram；
Figure 12 is thickness calibration curve schematic diagram；
Figure 13 is width calibration curve synoptic diagram.
Main Reference Numerals implication is in figure：
1st, transfer station 2, generating laser 3, support 4, wooden boards to be detected
5th, face battle array industrial camera 6, data collecting card 7, computer 8, PLC control cabinet.
Embodiment
Below in conjunction with the accompanying drawings the present invention is described in detail with specific embodiment.
Embodiment 1：
In the present embodiment, LASER Light Source comes from：Prophotonix companies, model are D-660-010-0250-L01-S-
90-S-S-2, wavelength are 660nm, and light extraction fan angle is 90 degree, power 10mW.It is PointGrey companies that face battle array industrial camera, which comes from,
Model GS3-U3-23S6C-C, camera resolution are 1920 × 1200,162 frames of maximum collection each second, USB3 interfaces.Camera lens goes out
From for：Nikon, model ML-U1614MP9, focal length 24mm.
Fig. 3 is the system structure diagram of on-line measuring device of the present invention；Fig. 4 is online inspection of the present invention
Survey the structural representation of device.
As shown in Figure 3 and Figure 4：The identification device of oblique fire formula wooden boards warpage, including transfer station 1, generating laser 2,
Support 3, face battle array industrial camera 4, the bridge-type of support 3 is erected in transfer station 1, along the direction of transfer of transfer station 1, successively in transfer station
Generating laser 2 and face battle array industrial camera 5 are set on the support 3 of 1 top, and described generating laser 2 is transmitted into transfer station 1
The light source on the upper surface of wooden boards 4 to be detected quilt cover battle array industrial camera 5 after wooden boards 4 to be detected reflection receives, and face battle array
Industrial camera 5 is connected with a computer 7 simultaneously, and data collecting card 6 is additionally provided between computer 7 and face battle array industrial camera 5,
In the present invention, above-mentioned generating laser 2 connects with PLC control cabinet 8 simultaneously, and PLC control cabinet 8 is used to control generating laser 2
Laser emission situation, the incident laser line and the optical axis angle in 90 ° of face battle array industrial camera 5 that generating laser 2 is launched, and institute
The incident light stated is slants, 0 90 ° of ＜ incidence angles ＜.
Fig. 5 is wooden boards warpage testing process schematic diagram.
The on-line checking side of the wooden boards warpage of on-line measuring device based on above-mentioned oblique fire formula wooden boards warpage
Method, comprise the following steps：
S1：Generating laser 2 launches LASER Light Source to wooden boards 4 to be detected in transfer station 1, and LASER Light Source is through to be detected
By the lens of face battle array industrial camera 5 after the reflection of the surface of wooden boards 4, then by the optical sensor positioned at lens rear portion receive into
Picture, the incident laser line of described generating laser 2 transmitting and the optical axis angle in 90 ° of face battle array industrial camera 5, and described enter
Light is penetrated as oblique fire, 0 90 ° of ＜ incidence angles ＜；
S2：The photosignal received is converted into data signal by described optical sensor；
S3：The data signal of the collection surface battle array industrial camera 5 of data collecting card 6 in computer, and by the place of computer
The warp image profile of wooden boards 4 to be detected is obtained after reason software processing, wood based panel is obtained according to warp image profile information
The thickness value pixel and width value pixel of material measured section, and pixel unit is converted into long measure, calculate maximum
Action hmaxWith the actual measurement width ω of wooden boards to be detected, angularity f is obtainedω,
Fig. 6 is that wooden boards warpage detects basic principle schematic.
Wherein thickness measure mathematical modeling is：
Generating laser 2 launches fan-shaped light source, is irradiated in horizontal transfer station 1, first by laser rays in camera during measurement
It is most clear that middle imaging is adjusted to, and whole test process is no longer adjusted to as during former at a distance of imaging parameters, imaging processes such as, object distances
Reason is as shown in fig. 6, generating laser 2 launches laser rays to the surface of wooden boards 4 to be detected (flash sheet material), the industry of face battle array
Camera 5 and generating laser 2 are angled to be imaged, and O points are the center of stationary lens, i.e. photocentre in figure, and B points are not put
Laser is irradiated to the point in transfer station 1 during flash sheet material, and it is 0 now to detect thickness value, now flat in the imaging of face battle array industrial camera 5
Picture point on face is B', and BB' line is by photocentre perpendicular to lens, i.e. optical axis.When put a thickness be x flash sheet material
When, laser is radiated at flash plate surface A points, and now the point on the imaging plane of face battle array industrial camera 5 is A', in face battle array work
The pixel value that thickness is offset in industry camera 5 is y'(units：Pixel), kcFor pixel size (unit in face battle array industrial camera 5：mm/
Pixel), it is camera constant.Make y=y ' kc, represent the pixel value y' and camera constant k that thickness is offset in cameracProduct, i.e.,
Thickness (the unit of wooden boards 4 to be detected in image：mm).
x：Detect thickness value
y：The thickness that unedged sawn timber is tested in image is that unedged sawn timber product surface and benchmark are tested in the battle array industrial camera of face
The skew thickness of bottom surface
θ：The incidence angle of generating laser
β：The optical axis of face battle array industrial camera and the surface normal angle of wooden boards to be detected
It is known that by geometrical relationship in figure：
X=ABcos θ
Y=A'B'
L=OB
L'=OB'
X'=AC
L "=OC
Wherein L represents the object distance being imaged when measurement thickness is 0, and L' is image distance, and L " is to measure the thing being imaged when thickness is not 0
Away from f is camera focus.When camera position is fixed, L, f, θ are fixed value, can be obtained by magnifying power formula
I.e.：X=ky (2)
In formula (2), x is the actual (real) thickness value of wooden boards to be detected；Y is wood based panel to be detected in the battle array industrial camera of face
The skew on material surface and benchmark bottom surface, y show as the thickness of wooden boards in thickness and width contour images, and k is thickness side
To spatial resolution, and described k be in the battle array industrial camera of face the skew y of wooden boards surface to be detected and benchmark bottom surface with
Wooden boards detection thickness value x linear relationship coefficient, this value size and the focal length of lens in test system, wooden boards is not put
When object distance, optical axis and laser beam angle together decide on.
And above-mentioned k numerical formula is：In k numerical formula, θ is generating laser
Incidence angle, β are angle of the optical axis with wooden boards surface normal to be detected of face battle array industrial camera, and f is camera focus, and L is represented
The object distance of battle array industrial camera imaging in face when thickness is 0, θ+β=90 ° are measured, so sin (θ+β) is fixed value 1, and when imaging system
System is fixed, and the lens location of face battle array industrial camera is fixed and inclination angle determines, generating laser highly determines away from transfer station, L, f, θ
It is fixed value, then k is also fixed value.
X can be calculated by thickness measure mathematical modelingmaxAnd xmin, so as to which h be calculatedmax=xmax-xmin。
Fig. 7 is the schematic diagram of width detection.
When the flash saw that a thickness x is placed on horizontal transmission bench it can be seen from thickness direction measurement model reasoning
During material, the laser wheel profile on unedged sawn timber surface moves the width at a segment distance to C points place perpendicular to optical axis direction lens
On direction, as shown in Figure 7：
If k2Represent the spatial resolution that thickness is width at 0, k'2For the spatial discrimination that thickness is width at x
Rate, it can be obtained by lens formula
As shown in formula (3)：θ+β=90 °, so cos (θ+β) is 0, so described k'2=k2, in formula：k2It is for thickness
The spatial resolution of width at 0, when imaging system is fixed, the object distance and image distance that measurement thickness is imaged when being 0 are fixation
It is worth, then k2For fixed value, and the calculation formula of the width of wooden boards to be detected is in final data processing software：
ω=k2′W' (4)
In formula (4), described ω be wooden boards to be detected developed width value, k2' it is that wooden boards to be detected are wide
Spend the spatial resolution in direction, W' is the width value of wooden boards to be detected showed in width profile image, described k2' be
Constant.
Fig. 8 is detection reference plane image, and the laser rays being only illuminated in figure on a conveyer belt is thick as detection sheet material
The line of reference of degree；Fig. 9 is the laser of wooden boards warpage detection image, the background of black and a very bright tool warpage radian
Line；Line image centered on Figure 10, the warpage radian of sheet material external face and the boundary point with datum line can be shown.
The specific calibration process of embodiment of above is：
(1) experiment material：
Test the fir wood plank of test specimen used for 4 pieces of common different size thickness, sawn timber mean breadth 180mm, length
800mm, there is obvious wane, sawn timber thickness specification is 20~50mm, is spaced 10mm, 4 pieces altogether, experiment numbers 1~4, tries
Part actual (real) thickness is measured by detecting system.Thickness calibration and usage finger gauge, specification are 5mm~25mm, interval 0.5mm, 30mm~
60mm, interval 5mm, 48 pieces altogether.The a width of 100mm of gauge block of width calibration, thickness specification are 10mm~60mm, are spaced 5mm, altogether
11 pieces of meter.
(2) experimental method：
According to the thickness and width resolution curve of above-mentioned test experience model, first standardization experimental apparatus, Ran Hou
Draw a mark line on stock board width to be measured, allow laser rays to be overlapped with mark line during test, draw laser measurement
Value.Use vernier caliper measurement sheet material mark line length again, and be considered accurate, as actual value, finally compare actual value with
Error amount between measured value, to weigh the precision of detecting system and reliability.The angle of inclination of camera is 45 °, LASER Light Source
Tested in the case of 45 ° of incidence angle θ=, LASER Light Source incidence angle schematic diagram is illustrated in fig. 11 shown below, and keeps generating laser to shine
The distance of support is constant where penetrating the normal of laser rays on a moving belt and face battle array industrial camera, the measurement of 4 blocks of sheet material of progress, often
Detection number is set on one block of sheet material as 56 lines.
(3) experimental data：
The thickness measurement data of table 1
Table 2, thickness model parameter list
From Tables 1 and 2：x1Represent the actual (real) thickness of warpage sheet material, y1Represent gauge block measurement pixel value, k1Represent oblique
Rate, b1Represent intercept thickness regression equation as:x1=k1*y1+b1。
Figure 12 is thickness calibration curve schematic diagram.
As shown in figure 12：Thickness direction demarcation under being 45 ° in LASER Light Source incidence angle has the very high linearity, phase
Relation number square is all more than 0.99, almost straight line, and model variance is very small below 0.1, illustrates model accuracy very
It is good.
3 45 degree of width calibration values of table
Table 4, width model parameter list
| Inclination angle | k2 | b2 | R2Coefficient correlation square | σ2Model variance |
| 45 degree | 0.00000036916 | 0.19544 | 0.071602 | 5.38e-08 |
As shown in Table 3 and Table 4：y2Represent unit pixel and correspond to developed width ratio, x2It is warpage sawn timber thickness unit
(mm),k2Represent regression slope, b2Represent intercept.Regression model：y2=k2*x2+b2.The coefficient correlation of θ=45° angle degree exists
0.071 or so, i.e. gauge block actual (real) thickness value and width resolution is almost without linear relationship, while model variance is essentially 0, almost
It is a horizontal linear.Model parameter is seen the above table shown in 4, while as shown in Figure 13, when optical axis and incident laser angle are 90 °
When, it can be seen that the resolution ratio of width is essentially a constant, only relevant in the optical parametric of measuring system, and with thickness simultaneously
It is irrelevant, do not change with the thickness change of tested unedged sawn timber, thus calibrating procedure can be simplified.Go for various rule
The different sheet material edge detection of lattice, greatly simplifies workflow, reduces working strength.
5,45 ° of angularity measured datas of table
As shown in Table 5, measuring system is reliable, and angularity precision reaches 1%, and maximum chord length precision represents this also 0.01
Invention can realize the on-line checking of wooden boards angularity.Length direction angularity then by wooden boards length direction by,
Other method is constant.The present invention has the advantages and positive effects of：Compared with artificial detection method, laser on-line checking has
Efficiency high, the advantages that precision is high；Measured simultaneously using range of triangle method, measurement accuracy improves, and realizes the online inspection of industry
Survey.
The present invention is illustrated according to above-described embodiment it should be appreciated that above-described embodiment does not limit this hair in any form
It is bright, all technical schemes obtained using equivalent substitution or equivalent transformation mode, it is within the scope of the present invention.
Claims (7)
1. a kind of on-line measuring device of oblique fire formula wooden boards warpage, including transfer station, generating laser, support, face battle array work
Industry camera, support bridge-type are erected in transfer station, along the direction of transfer of transfer station, are set successively on the support above transfer station
Generating laser and face battle array industrial camera, and described laser transmitter projects are to wooden boards surface to be detected in transfer station
Light source quilt cover battle array industrial camera after wooden boards to be detected reflection receives, and face battle array industrial camera connects with a computer simultaneously
It is logical, it is characterised in that the incident laser line of described laser transmitter projects and the optical axis angle in 90 ° of face battle array industrial camera,
And described incident light is to slant, 0 90 ° of ＜ incidence angles ＜.
2. a kind of wooden boards warpage of the on-line measuring device of the oblique fire formula wooden boards warpage based on described in claim 1
Online test method, it is characterised in that comprise the following steps：
S1：Generating laser launches LASER Light Source to wooden boards to be detected in transfer station, and LASER Light Source is through wood based panel to be detected
By the lens of face battle array industrial camera after the reflection of material surface, imaging is then received by the optical sensor positioned at lens rear portion, it is described
The incident laser line of laser transmitter projects and the optical axis angle in 90 ° of face battle array industrial camera, and described incident light is oblique
Penetrate, 0 90 ° of ＜ incidence angles ＜；
S2：The photosignal received is converted into data signal by described optical sensor；
S3：The data signal of data collecting card collection surface battle array industrial camera in computer, and by the processing software of computer
The warp image profile of wooden boards to be detected is obtained after processing, tested section of wooden boards are obtained according to warp image profile information
The thickness value pixel and width value pixel in face, and pixel unit is converted into long measure, calculate maximum action hmaxWith
The actual measurement width ω of wooden boards to be detected, obtains angularity fω,
3. the online test method of a kind of oblique fire formula wooden boards warpage according to claim 2, it is characterised in that in S1
In step, generating laser to the LASER Light Source that tested wood-based product launches be fan laser light source, and wooden boards to be detected
The striation that surface is formed is in-line striation.
4. the online test method of a kind of oblique fire formula wooden boards warpage according to claim 2, it is characterised in that in S3
In step, maximum action hmaxCalculating process be：
X=ky (I)
In public formula (I), x is the detection thickness value of wooden boards to be detected；Y is wooden boards table to be detected in the battle array industrial camera of face
The skew in face and benchmark bottom surface, y show as the thickness of wooden boards in warp image profile, and k is spatial resolution, and described
K be the skew y of wooden boards surface to be detected and benchmark bottom surface and wooden boards detection thickness value x in the battle array industrial camera of face
Linear relationship coefficient, by public formula (I), obtain xmaxAnd xmin, and hmax=xmax-xmin。
5. the online test method of a kind of oblique fire formula wooden boards warpage according to claim 4, it is characterised in that described
K numerical formula be：In k numerical formula, θ is the incidence angle of generating laser, and β is face battle array
The angle of the optical axis of industrial camera and wooden boards surface normal to be detected, f are camera focus, and L represents face when measurement thickness is 0
The object distance of battle array industrial camera imaging, θ+β=90 °, so sin (θ+β) is fixed value 1, and when imaging system is fixed, face battle array is industrial
The lens location of camera is fixed and inclination angle determines, generating laser highly determines that L, f, θ are fixed value, then k away from transfer station
For fixed value.
6. the online test method of a kind of oblique fire formula wooden boards warpage according to claim 2, it is characterised in that to be checked
The calculating process of actual measurement width ω for surveying wooden boards is：
ω=k2′W' (Ⅱ)
In formula (II), described ω be wooden boards to be detected developed width value, k2' it is wooden boards width side to be detected
To spatial resolution, W' is the width value of wooden boards to be detected showed in width profile image, described k2' it is normal
Number.
7. the online test method of a kind of oblique fire formula wooden boards warpage according to claim 6, it is characterised in that described
K'2=k2, in formula：k2For the spatial resolution that thickness is width at 0, when imaging system is fixed, and measurement thickness is 0
The object distance and image distance of imaging are fixed value, then k2For fixed value.
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| CN201710545221.0A CN107388962A (en) | 2017-07-06 | 2017-07-06 | A kind of on-line measuring device and detection method of wooden boards warpage |
| PCT/CN2018/094708 WO2019007405A1 (en) | 2017-07-06 | 2018-07-05 | Inclined saw timber defect detection apparatus and detection method |
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| WO2019007405A1 (en) * | 2017-07-06 | 2019-01-10 | 南京林业大学 | Inclined saw timber defect detection apparatus and detection method |
| CN109631766A (en) * | 2018-12-11 | 2019-04-16 | 南京第五十五所技术开发有限公司 | A kind of wood plank dimension measurement method based on image |
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