CN106468666B - A kind of Yarn filoplume 3 D detection method for handing over plane mirror imaging based on diclinic - Google Patents
A kind of Yarn filoplume 3 D detection method for handing over plane mirror imaging based on diclinic Download PDFInfo
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- CN106468666B CN106468666B CN201610573502.2A CN201610573502A CN106468666B CN 106468666 B CN106468666 B CN 106468666B CN 201610573502 A CN201610573502 A CN 201610573502A CN 106468666 B CN106468666 B CN 106468666B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N2021/8444—Fibrous material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8829—Shadow projection or structured background, e.g. for deflectometry
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Abstract
The invention discloses a kind of Yarn filoplume detection methods based on bimirror imaging, comprising steps of making camera collect 5 yarn images that are equally distributed, observing with different view in single-frame images before yarn is placed in two mutual angled plane mirrors；Demarcate the position of plane mirror and yarn；Ratio, positional relationship in collected picture, between mirror image and yarn real image；The position of yarn and form in each view are extracted using image processing method；Using plane mirror imaging principle, yarn view is pressed mirror-reflection path integration, synthesizes three-dimensional yarn model, the quantity and filoplume length in three dimensions of filoplume are detected from model；Measurement result of the invention is consistent with the truth of Yarn filoplume, has high accuracy.
Description
Technical field
The present invention relates to yarn qualities detection method fields, particularly relate to a kind of yarn that plane mirror imaging is handed over based on diclinic
Filoplume 3 D detection method.
Background technique
Yarn filoplume refers to the fiber for stretching out yarn evenness surface.Yarn filoplume will increase yarn and the surface of fabric is rubbed
It wipes, is easier pilling so as to cause fabric, influences product quality；In weaving process, the filoplume of 3mm or more be will lead on warp thread
Wefting insertion fails, and 3mm or more filoplume will also result in wefting insertion difficulty on weft yarn, can also generate weave faults.Therefore, Yarn filoplume is not only
It determines the appearance of textile, and has a significant impact to production efficiency, the measurement of Yarn filoplume has become measurement yarn qualities
Important indicator.Currently, the measurement of Yarn filoplume can be divided into weight method of singing, microscopic observation, photoelectric method by test philosophy
With two dimensional image analysis method.However, the equal existing defects of these methods, for example, the time of singing for method of singing is difficult to control, and can not
Guarantee that yarn evenness will not be damaged during singing；Microscopic method need to expend a large amount of labours and time, and measurement efficiency is lower；
Mainly the projection according to yarn on two-dimensional surface calculates filoplume length, institute for most of photoelectric method or measurement method based on image
The filoplume value measured ignores the form of filoplume in three dimensions, is not inconsistent with actual filoplume situation.Therefore, existing yarn
Filoplume measurement method can not accurately measure the exact amount and length of filoplume.
Summary of the invention
In view of this, it is an object of the invention to propose it is a kind of based on diclinic hand over mirror image can be achieved Yarn filoplume
The Yarn filoplume detection method of three-dimensionalreconstruction.
Based on above-mentioned purpose it is provided by the invention it is a kind of based on diclinic hand over mirror image Yarn filoplume 3 D detection method,
The following steps are included:
(1), before yarn is placed in two plane mirrors, the oblique angles of adjustment two sides plane mirror are made by multiple reflections from just
Face can see the image of yarn and its 4 different angles；
(2), the amplification factor or distance for adjusting camera, collect phase function in single-frame images from 5 different angles
The yarn image of observation, and 5 yarn views are evenly distributed on the image, one of view is the real image of yarn, other are
The virtual image；
(3), two plane mirror angulations are demarcated, the positional relationship of yarn and two sides plane mirror is demarcated；
(4), replace yarn position with calibration object, measure in acquired image ratio between yarn real image and the virtual image and
Positional relationship；
(5), yarn image is acquired with double mirror image Yarn filoplume acquisition systems；
(6), collected each image is divided into 5 points by the positional relationship according to the real image of calibration, the virtual image in the picture
Subgraph not containing 1 one thread image；
(7), according to calibration result, each virtual image subgraph is scaled to size identical with real image subgraph；
(8), following Digital Image Processing is carried out to each subgraph；
(9), it is compared by global threshold, modified opening operator, dilation operation, adjacent pixel gray value, morphology opening operation,
Yarn evenness is split from background；
(10), the child window for dividing the image into several 7 × 7 pixel sizes, in each window in addition to stem portion
Pixel carries out threshold decision, filoplume is separated from background, to obtain the yarn contours in each view；
(11), according to oblique mirror surface image-forming principle, camera parameter, calibration result, be partitioned into yarn bar, filoplume picture
Element is projected by each subgraph imaging optical path, is calculated their three dimensional space coordinate, is merged the projection knot of 5 yarn views
The threedimensional model of yarn can be obtained after fruit.
(12), filoplume part in the 3-D image of yarn is measured, calculates the length of every filoplume in three dimensions
Degree.
The oblique angles of two sides plane mirror are 72 ± 2 degree in step (1)；Preferably 72 degree.
From above as can be seen that the Yarn filoplume three dimensional detection provided by the invention for handing over plane mirror imaging based on diclinic
Method can obtain yarn with different view in single frame video image only with a camera using plane mirror imaging principle
The image observed is easy to demarcate camera by demarcating object；Using image processing method, yarn evenness portion is first extracted
Point, subdivided wicket threshold value extracts Yarn filoplume part, and the part for belonging to yarn is accurately separated with background；Using oblique
Mirror image principle is handed over, the yarn pixel in each view is projected by optical path, synthetic threads threedimensional model is fallen into a trap from 3-D image
The filoplume length of calculation has fully considered the actual conditions of filoplume in three-dimensional space, and accuracy of measurement is higher, than traditional two dimension
Method obtains more fully filoplume information.The method that diclinic of the invention hands over plane mirror imaging realizes the structure of yarn three-dimensional image
It builds, meanwhile, based on the filoplume data that method of the invention obtains, the length and quantity of Yarn filoplume are accurately measured, is reflected
The truth of Yarn filoplume.
Detailed description of the invention
It, below will be required in the description to implementation process of the invention in order to illustrate more clearly of technical solution of the present invention
Attached drawing to be used is briefly described, it is therefore apparent that and the accompanying drawings in the following description is only some embodiments of the present invention, for
For this field or those of ordinary skill, without creative efforts, other can be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the detection device that the present invention selects；Wherein, 1, camera, 2, microscope, 3, yarn, 4, plane mirror, 5, light
Source；
Fig. 2 is 5 views that diclinic hands over mirror surface to be formed；
Fig. 3 is that bimirror and yarn position are demarcated；
Fig. 4 is mirror-reflection path；
Fig. 5 is view conversion；
Fig. 6 is the yarn three-dimensional image of synthesis.
Specific embodiment
For the purpose of the present invention, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
The embodiment of the invention provides a kind of Yarn filoplume 3 D detection methods that plane mirror imaging is handed over based on diclinic, including
Following steps:
Before object is placed in a pair of mutual angled plane mirror, the void of several objects can be showed in plane mirror
Picture, these as reflect observe with different view the object as a result, using camera acquire in same frame video image simultaneously
The picture of picture with multiple objects, by the frame image, the 3-D image of synthetic body calculates yarn using three-dimensional data
The quantity and length of filoplume.
The method of the present embodiment the following steps are included:
(1) diclinic hands over the device of mirror surface detection Yarn filoplume, with reference to Fig. 1, adjusts the oblique angles between two plane mirrors, makes
In phase function acquired image, the image that yarn and 4 mirror-reflections obtain can be observed；
(2) amplification factor or distance for adjusting camera and camera lens, make 5 yarn views be evenly arranged in same frame video figure
As upper；
(3) two plane mirror angulations at this time are demarcated, the positional relationship of yarn and two sides plane mirror is demarcated；
(4) due to mirror surface at picture light path increase, the size for causing the virtual image to show in the picture reduced compared with real image, adopted
With in pearl needle (the spherical pin that syringe needle is rule) calibration acquired image between yarn real image and the virtual image ratio and
Positional relationship；
(5) mirror image Yarn filoplume acquisition system acquisition yarn image, image acquisition process are handed over the diclinic demarcated
In, lens focus need to be adjusted, is presented in each view clearly in same sub-picture.
With reference to Fig. 2, camera collects 5 yarn views of different perspectives observation, this 5 views include 1 yarn real image
With 4 yarn virtual images.Wherein, R is in kind, V1It is R in M1Imaging in (plane mirror 1), V4It is R in M2Institute in (plane mirror 2)
At picture, V2It is V4In M1Middle imaging, V3It is V1In M2Middle imaging.
(6) acquired image is divided into 5 and contained respectively by the positional relationship according to the real image of calibration, the virtual image on the image
There is the subgraph of an one thread image；
(7) according to calibration result, by V1、V2、V3And V4It is scaled to size identical with R；
(8) Digital Image Processing is carried out to each subgraph；
(9) divide yarn evenness, the specific steps are global threshold, modified opening operator, dilation operation, adjacent pixel gray values
Comparison and opening operation；
(10) divide Yarn filoplume, divide the image into the child window of several 7 × 7 pixel sizes, to being removed in each window
The pixel of stem portion carries out threshold decision, filoplume from separating the binaryzation yarn after image procossing in background
Image be reflect Yarn filoplume on corresponding visual angle it is observed that yarn contours.
(11) yarn three-dimensional model construction.Key step are as follows:
With reference to Fig. 3, to be handed in plane mirror in diclinic, yarn real image and its formed virtual image in plane mirror are indicated with circle, with
View R, V1And V3For illustrate these views correspond to practical yarn observation visual angle.VectorAngle in two plane mirrors is flat
On separated time, vectorIt is from focus to V1Observed direction, the observed direction of each view can be by focal length f and camera, yarn
It is derived with the positional relationship of plane mirror.XV1It is R and V in acquired image1The distance between, XV3It is R and V in image3It
Between distance.WithBetween angle α be represented by
Similarly, β is represented by
With reference to Fig. 4, in the mirror-reflection path of the virtual image, vectorExpression can be observed along the direction and V1Yarn wheel
The visual angle of wide symmetrical yarn image, it can be by vectorWithAnd indicate.
In formula, l is the distance between two plane mirror focis and R,It is plane mirror M1Unit normal vector.Because of vectorWithAbout plane mirror M1Symmetrically, the V in acquired image1It can reflect from visual angleThe case where observing yarn.V4With R
About plane mirror M2Symmetrically, V4Corresponding observation visual angle can be by the above V1Method derive.
With reference to Fig. 4, about secondary reflecting imaging V3, it is that R passes sequentially through plane mirror M1With plane mirror M2Imaging as a result,
VectorIndicate observed direction from focus to V3.VectorWithAbout plane mirror M2Symmetrically, vectorWithAbout
Plane mirror M1Symmetrically.VectorExpression can be observed along the direction and V3Show the visual angle of similar yarn contours.
In formula,Indicate plane mirror M2Unit normal vector.Because of vectorWithAbout plane mirror M2Symmetrically, then
V3It presents from visual angleThe image observed.Due to vectorWithAbout plane mirror M1Symmetrically, then from visual angleThe image that observes with from visual angleWhat is observed is similar.Therefore, from visual angleThe image observed is V3.View V2
Relationship between R can be by the above V3Relation derivation comes out between R.
When each view observed direction determine after, according to the relationship vertical with observed direction by 4 virtual images on the image
Profile move on the position of practical yarn R.With reference to Fig. 5, since collected yarn image is two-dimensional image, yarn
Profile is reduced to straight line.V1In yarn contours be transformed into R, V1In straight line perpendicular to vectorPoint PV1It is V1In it is straight
On line a bit, the point P in it and view RRAbout plane mirror M1Symmetrically.Each virtual image is positioned with the center of yarn evenness
It is transformed into the position of R, then by V1In yarn along vectorDirection is transformed into the position where practical yarn R.Remaining 3 void
As converting in this manner.
Yarn contours after conversion are projected in corresponding observed direction, such as yarn is transformed on the position R in V1,
EdgeDirection projection, the intersection of the projection of 5 views, can synthetic threads 3-D image, with reference to Fig. 6.
By the three-dimensional data of yarn model, the length and quantity of Yarn filoplume in three dimensions are calculated.
The present invention acquires yarn sequence image, and reprocessing is first saved to acquired image.Tested yarn movement speed exists
2-20m/min, it is 60 (fps) that camera, which acquires frame frequency,.
Select three kinds of yarns, the survey of the filoplume length and quantity and conventional microscope observation more of the invention being calculated
Amount is as a result, as listed in table 1.Wherein L is the filoplume length that the method for the present invention measures, LmThe filoplume measured for microscopic observation is long
Degree.Wherein, microscopic observation is difficult to accurately measure the length value compared with undercoat plumage, is indicated with "-".From the measurement knot of two methods
Fruit can illustrate, the accuracy of yarn three-dimensional model and filoplume test result that the present invention establishes.
1 the method for the present invention of table and conventional method filoplume length measurement
It should be understood by those ordinary skilled in the art that: the above is only a specific embodiment of the present invention, and
It is not used in the limitation present invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done,
It should be included within protection scope of the present invention.
Claims (3)
1. a kind of Yarn filoplume 3 D detection method for handing over mirror image based on diclinic, it is characterised in that: the following steps are included:
(1), before yarn is placed in two plane mirrors, the oblique angles of adjustment two sides plane mirror are made by multiple reflections from positive energy
See the image of yarn and its 4 different angles；
(2), the amplification factor or distance for adjusting camera collect phase function in single-frame images and observe from 5 different angles
Yarn image, and 5 yarn views are evenly distributed on the image, and one of view is the real image of yarn, other are the virtual image；
(3), two plane mirror angulations are demarcated, the positional relationship of yarn and two sides plane mirror is demarcated；
(4), yarn position is replaced with calibration object, measures the ratio in acquired image between yarn real image and the virtual image and position
Relationship；
(5), yarn image is acquired with double mirror image Yarn filoplume acquisition systems；
(6), collected each image is divided into 5 and contained respectively by the positional relationship according to the real image of calibration, the virtual image in the picture
There is the subgraph of 1 one thread image；
(7), according to calibration result, each virtual image subgraph is scaled to size identical with real image subgraph；
(8), following Digital Image Processing is carried out to each subgraph；
(9), by global threshold, modified opening operator, dilation operation, the comparison of adjacent pixel gray value, morphology opening operation, yarn
Lines are dry to be split from background；
(10), the child window for dividing the image into several 7 × 7 pixel sizes, to the pixel in each window in addition to stem portion
Threshold decision is carried out, filoplume is separated from background, to obtain the yarn contours in each view；
(11), according to oblique mirror surface image-forming principle, camera parameter, calibration result, be partitioned into yarn bar, filoplume pixel by
Each subgraph imaging optical path projection, calculates their three dimensional space coordinate, after the projection result for merging 5 yarn views
The threedimensional model of yarn can be obtained；
(12), filoplume part in the 3-D image of yarn is measured, calculates the length of every filoplume in three dimensions.
2. a kind of Yarn filoplume 3 D detection method for handing over mirror image based on diclinic according to claim 1, feature
Be: the oblique angles of two sides plane mirror are 72 ± 2 degree in step (1).
3. a kind of Yarn filoplume 3 D detection method for handing over mirror image based on diclinic according to claim 2, feature
Be: the oblique angles of two sides plane mirror are 72 degree in step (1).
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| CN111311659B (en) * | 2020-02-17 | 2024-01-09 | 江南大学 | Calibration method based on three-dimensional imaging of oblique plane mirror |
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| CN113744222B (en) * | 2021-08-26 | 2024-04-30 | 江南大学 | Yarn evenness three-dimensional modeling and calibrating method based on inscribed circles |
| CN115035110B (en) * | 2022-08-10 | 2022-11-01 | 南通永安纺织有限公司 | Yarn hairiness quantitative detection method based on pit cutting and chain code tracking |
| CN115082656B (en) * | 2022-08-23 | 2022-11-25 | 江苏万喜登家居科技有限公司 | Yarn hairiness damage identification method in spinning process and data processing system |
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