CN207832131U - Braiding yarn speed based on line-scan digital camera and measurement of length system - Google Patents
Braiding yarn speed based on line-scan digital camera and measurement of length system Download PDFInfo
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- CN207832131U CN207832131U CN201820075883.6U CN201820075883U CN207832131U CN 207832131 U CN207832131 U CN 207832131U CN 201820075883 U CN201820075883 U CN 201820075883U CN 207832131 U CN207832131 U CN 207832131U
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Abstract
The braiding yarn speed that the utility model is related to a kind of based on line-scan digital camera and measurement of length system, belong to weaving fields of measurement, the utility model includes LED light source, line-scan digital camera, weave yarn and image pick-up card, the measuring system is assembled on existing textile winding machinery, braiding yarn to be measured is irradiated by LED light source, braiding yarn moving image is acquired by line-scan digital camera, image processing and analyzing is carried out using the FPGA unit of image pick-up card, had the characteristics that according to the texture of braiding yarn periodic, extract the texture number of yarn in image, and the speed and length that number calculates braiding yarn are managed according to a width time-space image meduim yarn strain line.The utility model weaves the time-space image of yarn movement using line-scan digital camera acquisition, yarn textural characteristics and background contrast are apparent, image is simple, can calculate the winding speed of yarn in different time, on-line measurement yarn speed and length by changing the size of each image.
Description
Technical field
The braiding yarn speed that the utility model is related to a kind of based on line-scan digital camera and measurement of length system, belong to weaving
Field of measuring technique.
Background technology
In braiding reel for yarn is around journey, braiding yarn speed and length on-line measurement are a very important indexs.
The tension of the winding speed and effect length braiding yarn of yarn is woven, if speed is slow, braiding yarn tension conference causes to break end；
Speed is fast, weaves Yarn relaxation, causes to wind, can be brought greater impact to textile industry.Weave yarn winding speed and length
Degree on-line measurement is a principal element of winding quality quality.
The yarn speed that textile industry uses at present includes mainly two methods with length measuring system：The first is contact
Formula measures, i.e., is in contact and is measured with yarn by guide sheave, however this contact type measurement is clearly present of some
Shortcoming, it is important to which sheave linear velocity and yarn winding speed is not consistent, i.e., smooth problem, it is by yarn cornerite, friction
The influence of coefficient etc..Second is optical correlation method to measure the speed of yarn, passes through two image measurement devices and acquires reel for yarns
Around image, and yarn edge wave shape is compared, the speed of yarn is calculated by extracting the time of same edge waveform, but this
Apparatus structure is extremely complex, and needs two image measurement devices to measure the waveform observed, realizes difficulty, and weave yarn
For periodic texture, the method is not suitable for measuring the winding speed and length of braiding yarn.
Utility model content
Existing for existing braiding yarn winding speed and length on-line measurement system
Drawbacks described above, it is proposed that a kind of braiding yarn speed based on line-scan digital camera and measurement of length system, in existing weaving loom
The system is assembled on tool, and braiding yarn is irradiated by LED light source, the braiding yarn space-time of irradiated site is acquired using line-scan digital camera
Image, and collected time-space image is input in image pick-up card, using FPGA image processing systems to the image of acquisition
It is handled, the texture number for weaving yarn in time-space image is counted, according to braiding yarn periodic texture and line-scan digital camera
The characteristics of time-space image, calculates winding speed and length, and braiding yarn winding can be measured in the case where not contacting braiding yarn
Speed and length realize the non-contact forecasting of braiding yarn speed and length.
Braiding yarn speed based on line-scan digital camera and measurement of length system, including line-scan digital camera, LED light source and image
Capture card, the LED light source and line-scan digital camera are mounted on the coiling direction perpendicular to braiding yarn to be measured, according to be measured
The mounting distance of the braiding yarn vibration range setting LED light source and braiding yarn of amount.
Further, the LED light source is mounted on the homonymy of braiding yarn, the LED light source and line with line-scan digital camera
The angle of array camera acquisition position is less than 15 °, and direction of illumination is acquisition position of the line-scan digital camera on braiding yarn.
Further, if L is the distance between camera lens and braiding yarn, v is moved axially when being braiding yarn winding
Speed.Since the diameter of braiding yarn is smaller, it is contemplated that line-scan digital camera acquires shared by quality and the braiding yarn of image
Pixel number k=fd/Lh can increase pixel number shared by f adjustment yarns by reducing camera and yarn distance L.To make at image
Reason is easy to carry out, and yarn pixel number should be greater than being equal to 5 pixels in the utility model, and wherein f is the focal length of line-scan digital camera camera lens,
D is the diameter for weaving yarn, and h is line-scan digital camera pixel dimension.To ensure picture quality, yarn pixel number is answered in the utility model
More than 5 pixels, wherein f are the focal lengths of line-scan digital camera camera lens, and d is the diameter for weaving yarn, and h is line-scan digital camera pixel dimension.
The utility model uses tight shot, therefore f is determined, 5≤fd/Lh, camera and yarn distance L≤fd/5h.
Further, the utility model is the light acquisition image using knitting yarn line reflection LED light source, weaves yarn row
Into may cause to vibrate in the process, therefore the depth of field need to choose higher value, to ensure imaging clearly.The calculation formula of the depth of field is Δ L
=2f2.FδL2/(f4-F2δ2L2), wherein δ is the disperse circular diameter allowed, and F is f-number.To ensure blur-free imaging, the depth of field is most
Small value is Δ Lmin, then
Further, the LED light source uses strong brightness light source.
Further, FPGA image processing systems are integrated in described image capture card, to the collected original of line-scan digital camera
The begin time-space image of braiding yarn is filtered, binaryzation, Morphological scale-space, from being partitioned into braiding yarn in treated image
Texture, and measure braiding yarn texture number n.
The utility model has the beneficial effects that：
(1) the utility model realizes by line-scan digital camera, LED light source and image pick-up card and is not contacting braiding yarn
In the case of measure yarn winding speed and length；
(2) the utility model acquires image using line-scan digital camera, is compared obviously between knitting yarn strain line reason, and image is simple,
The size of image may be selected to improve measuring speed and precision.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the flow chart that on-line measurement is carried out using system described in the utility model.
Fig. 3 is the braiding reel for yarn of the utility model line-scan digital camera acquisition around the original image in journey.
Fig. 4 is braiding yarn binary image after the utility model image procossing.
Fig. 5 is the image that the utility model carries out connected component labeling.
In figure：1, line-scan digital camera；2, LED light source；3, yarn is woven；4, image pick-up card；5, guiding mechanism；6, it winds
Axis.
Specific implementation mode
It is below in conjunction with the accompanying drawings and specific example, right to keep the purpose of this utility model, technical solution and advantage clearer
The utility model proposes the non-contact braiding yarn speed based on line-scan digital camera be further described with length measurement method.
Braiding yarn speed and length measuring system described in the utility model based on line-scan digital camera, as shown in Figure 1, packet
Include line-scan digital camera 1, LED light source 2 and image pick-up card 4, further include guiding mechanism 5 be coil weave yarn guide, wireline reel 6 use
In braiding yarn winding, the LED light source 2 and line-scan digital camera 1 are mounted on perpendicular to the winding side of braiding yarn 3 to be measured
To according to the mounting distance of braiding 3 oscillating region of yarn setting LED light source 2 and braiding yarn 3 to be measured.The LED light
Source 2 is mounted on the homonymy of braiding yarn 3 with line-scan digital camera 1, and the LED light source 2 and the angle of 1 acquisition position of line-scan digital camera are less than
15 °, direction of illumination is acquisition position of the line-scan digital camera 1 on braiding yarn 3.
If L is the distance between camera lens and braiding yarn 3, v is to weave the speed moved axially when yarn 3 is wound.
Since the diameter of braiding yarn 3 is smaller, it is contemplated that the quality and the pixel shared by braiding yarn 3 that line-scan digital camera 1 acquires image
Number k=fd/Lh can increase pixel number shared by f adjustment yarns by reducing camera and yarn distance L.To keep image procossing easy
Yarn pixel number should be greater than being equal to 5 pixels in progress, the utility model, and wherein f is the focal length of 1 camera lens of line-scan digital camera, and d is
The diameter of yarn 3 is woven, h is 1 pixel dimension of line-scan digital camera.To ensure picture quality, yarn pixel number is answered in the utility model
More than 5 pixels, wherein f are the focal lengths of 1 camera lens of line-scan digital camera, and d is the diameter for weaving yarn 3, and h is 1 pixel ruler of line-scan digital camera
It is very little.The utility model uses tight shot, therefore f is determined, 5≤fd/Lh, camera and yarn distance L≤fd/5h.
In addition the utility model is the light acquisition image using braiding 3 reflex LED light source 2 of yarn, and braiding yarn 3 is advanced
It may cause to vibrate in the process, therefore the depth of field need to choose higher value, to ensure imaging clearly.The calculation formula of the depth of field is Δ L=
2f2FδL2/f4-F2δ2L2), wherein δ is the disperse circular diameter allowed, and F is f-number.To ensure blur-free imaging, depth of field minimum value
For Δ Lmin, then
Measurement method based on measuring system described in the utility model includes the following steps：
Step 1：It is filled on existing braiding Yarn winding apparatus using line-scan digital camera 1, LED light source 2 and image pick-up card 4
With non-contact braiding yarn speed and length on-line measurement system, for weave 3 winding process medium velocity of yarn and length
Line automatic measurement, wherein line-scan digital camera 1 is connect with image pick-up card 4, and LED light source 2 uses high bright light source；In winding process
In braiding yarn 3 be axially moved, in the nearby installation LED light source 2 of braiding yarn 3 to be measured and perpendicular to knitting yarn
Line-scan digital camera 1 is installed in the position of 3 coiling direction of line, and the pixel number line shared by braiding yarn 3 to be measured determines array camera
Mounting distance L, to complete the acquisition of braiding 3 image of yarn.
As shown in Fig. 2, it is to weave yarn 3 to wind mobile linear velocity to set v, arrow direction is that braiding yarn 3 is wound in figure
Direction, L is distance of 1 camera lens of line-scan digital camera to yarn plane to be measured, due to braiding yarn 3 diameter it is smaller, it is contemplated that
The quality and the pixel number k=fd/Lh shared by braiding yarn 3 that line-scan digital camera 1 acquires image, to keep pixel number shared by yarn full
Foot requires, and should reduce camera and yarn distance L, increases f.Wherein f is the focal length of 1 camera lens of line-scan digital camera, and d is braiding yarn 3
Diameter, h is 1 pixel dimension of line-scan digital camera.
Step 2：LED light source 2 is irradiated to braiding yarn 3 to be measured, the volume of irradiation position is acquired by line-scan digital camera 1
3 texture image of weaving yarn line, and collected original 3 image of braiding yarn is input to by data-interface in image pick-up card 4；
According to the difference of the working method of camera, industrial camera can be divided into line-scan digital camera 1 and area array cameras two major classes, face
Array camera filming frequency is relatively low, and the image of acquisition is spatial image, and needs to consider image mosaic problem；Inside line-scan digital camera 1
Include only a line sensor unit, line-scan digital camera 1 is continuously scanned acquisition target, and single pass forms a line figure
Picture, the image then formed arrange from the top down, constitute piece image, and the time that often row pixel represents is different, and image is a width
Time-space image, the line frequency of line-scan digital camera 1 represent the picture number of shooting per second.And inside area array cameras it is the sensing of matrix shape
Device is scanned acquisition target with a breadth, obtains a width spatial image, and transverse and longitudinal coordinate all represents space.On-line measurement is
It is required that the speed measured is high, general to require to be less than 50ms, braiding 3 speed of yarn is very important parameter, if measuring not in time,
Cause winding speed per hour to be spent slowly, yarn is caused to wind；Excessive velocities, tension become larger, and cause Yarn break, cause serious consequence.
In the utility model, representative image is selected, the line frequency of camera is set according to braiding 3 winding speed of yarn to be measured
And row resolution ratio, the resolution ratio of line-scan digital camera 1 are 512, setting line frequency is 10klps, then in the original yarn image acquired often
Row pixel represents 0.1ms, and it is 512 × 150 that when storage, which selects the size of each image, then each image represents 15ms, in the survey
In amount method, the time for measuring braiding 3 speed of yarn is about 15ms, and since storage image is small, image processing speed is fast, then
The time of braiding 3 tachometric survey of yarn can be controlled within 30ms, and measurement frequency realizes on-line measurement up to 30Hz, meanwhile,
The acquisition size of original image can be reduced, improve measuring speed；Reduce the lateral resolution of original image, improves image procossing speed
Degree.
Step 3：At FPGA image processing systems original braiding 3 image of yarn collected to line-scan digital camera 1
Reason, the texture number n in braiding 3 image of yarn after statistical disposition；Binaryzation is carried out, at morphology to original yarn image
Reason, obtains binary image, braiding 3 texture of yarn is partitioned into from binary image, and measure texture number n.Utilize LED light
The irradiation of source 2 braiding yarn 3, acquisition braiding 3 image of yarn of line-scan digital camera 1, since braiding 3 texture of yarn is more apparent, to original
When image carries out binary conversion treatment, it can be relatively easy to selection segmentation threshold, after being as shown in Figure 4 the utility model image procossing
Weave 3 binary image of yarn.
To weaving the measurement of 3 texture number of yarn in binary image, the utility model proposes connection domain method：
It is connected to domain method, i.e.,：It is a connected domain that 3 each texture of yarn is woven from binary image, can pass through calculating
The number of connected domain is come the image that the texture number n, Fig. 5 that calculate in piece image are that the utility model carries out connected component labeling.
Step 4：Determine what the texture number n, the distance between texture λ that are counted in step 3 and each image were represented
Time calculates the winding speed of braiding yarn 3 according to formula v=Δ L/ Δs t=n λ/Δ t；It counts in all images and weaves yarn
3 texture number n calculates the spooling length of braiding yarn 3 according to formula l=n λ.
The image that line-scan digital camera 1 acquires is time-space image, i.e. abscissa row pixel represents spatial position, and ordinate row picture
Element represents the time, i.e., in the image that line-scan digital camera 1 acquires, row pixel is to weave the spatial image of yarn 3, represents braiding yarn
3 diameter, and row pixel is to weave the temporal image of yarn 3, represents the motion diagram of collected braiding yarn 3 of different time
Picture, wherein the line frequency of line-scan digital camera 1 is 10klps, and image size is 512 × 150, i.e. each image represents 15ms, linear array phase
Original image in braiding 3 winding process of yarn that machine 1 acquires.
In the utility model, LED light source 2 is with braiding yarn 3 apart from for 10cm, and line-scan digital camera 1 is apart from braiding yarn
350cm.The utility model uses the texture between yarn for λ=1.3mm, according to gained n=6 in legend.Upper and lower ends
Connected component is in the edge of image, it is therefore desirable to compensate, upper end 0.89, lower end 0.81, therefore Len got is l
=7.41mm, each image time are 15ms, and gained speed is v=l/ Δ t=0.494m/s, and encoder gained speed is
0.5m/s, two methods gained speed absolute error are 0.006m/s, and reason, which may be the skidding in winding process, be such that speed drops
It is low.
Certainly, the above is only the preferred embodiment of the utility model, be should not be construed as limiting new to this practicality
The scope of embodiments of type.The utility model is also not limited to the example above, and those skilled in the art are in this reality
With all the changes and improvements etc. made in novel essential scope, the patent covering scope of the utility model should all be belonged to
It is interior.
Claims (6)
1. a kind of braiding yarn speed based on line-scan digital camera and measurement of length system, it is characterised in that：Including line-scan digital camera
(1), LED light source (2) and image pick-up card (4), the LED light source (2) and line-scan digital camera (1) are mounted on perpendicular to be measured
Braiding yarn (3) coiling direction, according to braiding yarn (3) oscillating region setting LED light source (2) to be measured and knitting yarn
The mounting distance of line (3).
2. measuring system according to claim 1, it is characterised in that：The LED light source (2) is pacified with line-scan digital camera (1)
Mounted in the homonymy of braiding yarn (3), the LED light source (2) and the angle of line-scan digital camera (1) acquisition position are less than 15 °, irradiation side
To the acquisition position for line-scan digital camera (1) on braiding yarn (3).
3. measuring system according to claim 1, it is characterised in that：If between camera lens and braiding yarn (3) away from
From for L, the speed that braiding yarn (3) moves axially when winding is v, this line-scan digital camera (1) should expire at a distance from braiding yarn (3)
Sufficient L≤fd/kh, wherein f are the focal lengths of line-scan digital camera (1) camera lens, and d is the diameter for weaving yarn (3), h be line-scan digital camera (1) as
Elemental size, k are yarn pixel numbers.
4. measuring system according to claim 1, it is characterised in that：To ensure blur-free imaging, also should ensure thatWherein δ is the disperse circular diameter allowed, and F is f-number, Δ LminFor depth of field minimum value
For.
5. measuring system according to claim 1, it is characterised in that：The LED light source (2) uses strong brightness light source.
6. measuring system according to claim 1, it is characterised in that：FPGA figures are integrated in described image capture card (4)
As processing system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735398A (en) * | 2020-05-22 | 2020-10-02 | 共享智能铸造产业创新中心有限公司 | Device for measuring length of linear object |
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- 2018-01-17 CN CN201820075883.6U patent/CN207832131U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735398A (en) * | 2020-05-22 | 2020-10-02 | 共享智能铸造产业创新中心有限公司 | Device for measuring length of linear object |
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