CN207132850U - A kind of real-time displacement device for accurately measuring based on bar code ruler - Google Patents
A kind of real-time displacement device for accurately measuring based on bar code ruler Download PDFInfo
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- CN207132850U CN207132850U CN201720417697.1U CN201720417697U CN207132850U CN 207132850 U CN207132850 U CN 207132850U CN 201720417697 U CN201720417697 U CN 201720417697U CN 207132850 U CN207132850 U CN 207132850U
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- bar code
- ruler
- dolly
- code ruler
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Abstract
The utility model discloses a kind of real-time displacement device for accurately measuring based on bar code ruler.Described device includes bar code ruler and machine vision displacement measurement system, and it is the uninterrupted bar code combination rulers of 1mm that bar code ruler, which is arranged on guide rail, has the function that graduated scale；Machine vision displacement measurement system is arranged on dolly, main to include with lower part：CCD camera, enlarging lens, light source and image processing module, the system can carry out real-time coordinates to bar code ruler with the movement of camera and accurately measure.Described device to camera unit pixel by demarcating, and gather bar code graduated scale current position image, image pixel is divided into virtual vernier scale using vernier caliper reading principle, bar code ruler is as main scale, the accurate dolly that reads is presently in coordinate, monitored in real time in dolly moving process, determine dolly displacement parameter.This method can apply one-dimensional rectilinear coordinates and displacement detecting in various industrial productions, and accumulated error is small, and measurement accuracy is high, can monitor in real time.
Description
Technical field
The utility model particularly belongs to a kind of displacement measuring device, relates generally to a kind of straight line based on bar code graduated scale and leads
Rail dolly real-time displacement device for accurately measuring.
Background technology
The measurement of one-dimensional straight-line displacement has a wide range of applications in industrial production line, such as production line accessory cart
Accurate parking.Measurement to rectilinear coordinates, currently conventional method is the measuring method based on grating or Principles of Laser, measurement essence
Degree is higher, but its is complicated, install and debug it is relatively difficult, it is higher to use and maintenance environmental requirement, make its measurement into
This is higher, can not also be popularized in actual production.
As the development of the correlation techniques such as computer graphics, computer vision, digital image processing techniques are gradual
Detection field is applied to, is currently obtained extensively in the field such as shape of product and the non-cpntact measurement of size, appearance quality testing
General application.In recent years, digital image processing techniques were gradually applied to displacement measurement, but overcame measurement due to having no idea
During error accumulation problem, universal measurement accuracy is relatively low, can not be applied to actual production in.
Utility model content
To solve, existing line slideway dolly real-time displacement measuring method is complicated and measurement accuracy is low asks the utility model
A kind of topic, there is provided displacement device for accurately measuring based on the detection of machine vision bar code ruler.First phase is utilized in absolute coordinate zero point
Machine pixel carries out pixel demarcation to image with bar code ruler actual graduation value, and the current bar code ruler of camera acquisition is utilized in moving process
Image, the system architecture is simple, and accumulated error is small, and measurement range is big, monitors dolly in real time and is presently in coordinate.
The technical solution of the utility model is as follows：A kind of real-time displacement based on bar code ruler of the utility model accurately measures dress
Put, it is characterised in that including NI Vision Builder for Automated Inspection and bar code graduated scale.The bar code ruler is horizontally fixed on track, the bar code ruler
For graduated scale continuous arrangement, every two adjacent graduation marks include identical and unique code system bar code, scale division value 1mm, bar shaped
Code proper alignment；The NI Vision Builder for Automated Inspection includes CCD camera, enlarging lens, image processing module and light source, for supervising online
Survey and obtain current location bar code ruler image and decode, accurately read current position coordinates, precision if needed may be used up to 0.1mm
Increase to it is higher, such as 0.02mm.
Further, the parallel fixation of the bar code ruler is in orbit, and the bar code ruler range can increase and decrease as needed, you can uses
Short distance measurement is can also be used in large range measuring.
Further, the NI Vision Builder for Automated Inspection is fixed on along the dolly of track travel, camera distance bar code ruler 30-
150mm。
Further, the alignment pin is located at track and bar code ruler initial position, camera lens when dolly is locked to this
Bar code ruler zero graduation line is directed at, camera pixel is demarcated in the position, ensures measurement accuracy.
Further, the camera is inexpensive CCD camera, and resolution ratio is 1280 × 960, frame frequency 15fps；The mirror
Head is 1-6 times of multiplication factor, can be focused on automatically；The light source is placed in camera lens front end, is carried for the acquisition of bar code image
Irradiated for no-reflection, improve machine vision definition.
Further, described image processing module is integration block device.
The utility model is a kind of to realize that the step of displacement and coordinate are monitored on-line is as follows using aforementioned means；
Step 1：Start dolly real-time displacement measurement apparatus, empty data recovery original state, calibration dolly is located at coordinate
Axle zero point, i.e. bar code ruler zero graduation line position, the bar code ruler scale division value are 1mm, and the image and actual scale of camera shooting are carried out
Pixel scalar is asked in calibration, and image processing module by the decile of 9mm pixels 10 corresponding to reality in image, is arranged to as needed
Vernier scale state, the displacement measurement accuracy reach 0.1mm；
Step 2：Dolly control module drives carriage walking, and camera obtains and is presently in bar code ruler during walking
Information, and image information is sent to image processing module；
Step 3：Image processing module obtains current bar code digital coding, determines the coordinate integers of the position according to image
Position.
Further, then graduation mark in image equivalent to which bar graduation mark of the pixel of vernier scale and bar code ruler is judged
Alignment, decimal place attend school a few tenths of a mm, and integer-bit and decimal place are combined and are presently in coordinate value as dolly, should
Coordinates measurements are accurate to 0.1mm, can be accurate to as needed it is higher, such as 0.02mm.
Further, program records coordinate transform of the dolly relative to absolute coordinate zero point, according to the coordinate difference of record
The absolute displacement of the dolly is calculated, finally sends the data after processing to displacement display screen, realizes line slideway dolly
Real-time displacement accurately measures.
A kind of real-time displacement device for accurately measuring based on bar code ruler of the utility model, passes through the machine on dolly
With the bar code graduated scale on guide rail relative displacement occurs for vision system, and the accurate dolly that reads is presently in coordinate, moved in dolly
During monitor in real time.Measurement of the present utility model is not influenceed by range, overcomes the accumulation problem of error in measurement process,
Measurement accuracy is ensure that, can be not only used for coordinate measurement, it can also be used to displacement detecting, using the contactless survey of Digital Image Processing
Amount, can in real time monitor, be widely used, practicality is stronger.
Brief description of the drawings
The utility model is further described below in conjunction with the accompanying drawings.
Fig. 1 is the principle schematic of the utility model image method detection coordinates.
Fig. 2 is displacement measuring device structure schematic diagram of the utility model based on bar code ruler.
Fig. 3 is the utility model absolute displacement detection algorithm flow chart.
In figure：0-10 is scale value, 11, walking dolly, 12, image processing module, 13, camera, 14, enlarging lens, 15,
Light source, 16, bar code ruler, 17, alignment pin, 18, guide rail, 19, control panel, 20, coordinate display, 21, bar code, 22, scale
Chi, 23, the scale value of pixel, 24-35 is bar code graduated scale scale value.
Specific implementation method
Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that the advantages of the utility model
It can be easier to be readily appreciated by one skilled in the art with feature, it is apparent clear and definite so as to be made to the scope of protection of the utility model
Define.The utility model is described in further detail below in conjunction with accompanying drawing.
As illustrated, a kind of real-time displacement device for accurately measuring based on bar code ruler of this example is surveyed including machine vision displacement
Amount system and bar code ruler.Machine vision displacement measurement part (can use axis light by CCD camera 13, enlarging lens 14, light source 15
Source) and image processing module 12 form, machine vision displacement measurement system be arranged on along the walking dolly 11 of track 18, magnifying glass
Before first 14 are arranged on CCD camera 13, auto-focusing can be achieved, the no-reflection of light source 15 irradiation before camera lens 14 is very suitable
The reflective object of credit union is taken pictures, and is improved machine vision definition, dolly 11 was photographed the picture of bar code ruler 16 during movement
Position become apparent from precisely；The algorithm flow of image processing module 12 is as shown in Figure 3.Bar code ruler 16 is by bar code 21 and scale
Chi 22 forms, and is horizontally fixed on guide rail 18, and graduated scale 22 is the isometric graduation mark continuous arrangements of scale division value 1mm, and bar code 21 is embedding
It is identical code system between two graduation marks, is the reading of residing graduated scale 22 after any decoding of bar code 21.
Start dolly real-time displacement measurement apparatus, empty data recovery original state, dolly 11 is calibrated using alignment pin 17
On the alignment coordinates axle zero point of camera 13, i.e. the zero graduation line position of bar code ruler 16, the image comparison bar code ruler 16 that camera 13 is shot
Actual scale value carries out calibration and asks for pixel scalar, and image processing module 12 will actually correspond to scale as needed in shooting image
The decile of 9mm pixels 10 of chi 22, is arranged to the scale value 23 based on pixel, and the measurement accuracy of coordinate is such as schemed up to 0.1mm
Shown in 1, the current coordinate value that reads is 25.3mm.
The camera 13 during walking of dolly 11, which obtains, is presently in the image of bar code ruler 16, and by image information send to
Image processing module 12；Image processing module 12 will scheme to obtaining image threshold setting greyscale image transitions into bianry image
Bar code ruler 16 maximizes reduction as in, and the bar shaped corresponding to interception vernier scale zero point image slices vegetarian refreshments is set followed by algorithm
Code 21.
Decoding program decodes to the bar code 21 intercepted, calculates 21 each pulse width of bar code, and by its
A series of binary numerals are converted into, are decoded according to the code character of the code system, obtain current bar code digital coding i.e. pair
The scale value answered, determines the coordinate of the position, and as dolly 11 is presently in coordinate value.In the program record moving process of dolly 11
Relative to the coordinate transform of absolute coordinate zero point, absolute displacement is drawn by coordinates computed difference, finally sent out the data after processing
Coordinate display 20 is delivered to, realizes that the real-time displacement of line slideway dolly 11 accurately measures.
Claims (3)
1. a kind of real-time displacement device for accurately measuring based on bar code ruler, it is characterised in that by being fixed on machine on dolly 11
Vision displacement measuring system understands Current camera and corresponds to bar code ruler 16, and the changing coordinates of dolly 11 are accurately measured；It is described
Bar code ruler 16 is the continuous arrangement of graduated scale 22, and the scale division value of bar code ruler 16 is 1mm, in every two adjacent graduation marks comprising identical and
Unique code system bar code 21, after the bar code 21 is decoded, its numeric sequence number is corresponding with being presently in scale value, bar code
21 proper alignments.
A kind of 2. real-time displacement device for accurately measuring based on bar code ruler according to claim 1, it is characterised in that：It is described
Machine vision displacement measurement system is fixed on moveable carriage 11, by CCD camera 13, camera lens 14, image processing module
12 and light source 15 form, the camera lens 14 are corresponding with bar code ruler 16.
A kind of 3. real-time displacement device for accurately measuring based on bar code ruler according to claim 2, it is characterised in that：It is described
Camera is inexpensive CCD camera, and resolution ratio is 1280 × 960, frame frequency 15fps；The camera lens are 1 ~ 6 times of times magnification
Number；The light source is fixed on camera lens front end, provides no-reflection irradiation for the acquisition of bar code image, it is clear to improve machine vision
Degree；Described image processing module is integration block device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720417697.1U CN207132850U (en) | 2017-04-20 | 2017-04-20 | A kind of real-time displacement device for accurately measuring based on bar code ruler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720417697.1U CN207132850U (en) | 2017-04-20 | 2017-04-20 | A kind of real-time displacement device for accurately measuring based on bar code ruler |
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| CN207132850U true CN207132850U (en) | 2018-03-23 |
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| CN201720417697.1U Expired - Fee Related CN207132850U (en) | 2017-04-20 | 2017-04-20 | A kind of real-time displacement device for accurately measuring based on bar code ruler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109373896A (en) * | 2018-10-19 | 2019-02-22 | 东莞复熵智能科技有限公司 | A kind of NI Vision Builder for Automated Inspection and its implementation of one direction measurement displacement |
| CN112589534A (en) * | 2021-01-07 | 2021-04-02 | 中铁宝桥（南京）有限公司 | On-line detection equipment and detection method for numerical control drilling machining of turnout rail piece |
| CN113607419A (en) * | 2021-08-02 | 2021-11-05 | 广东工业大学 | Engine cylinder block electronic tag detection device and method |
| WO2022165654A1 (en) * | 2021-02-03 | 2022-08-11 | 欧菲光集团股份有限公司 | Detection apparatus, camera module and electronic device |
-
2017
- 2017-04-20 CN CN201720417697.1U patent/CN207132850U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109373896A (en) * | 2018-10-19 | 2019-02-22 | 东莞复熵智能科技有限公司 | A kind of NI Vision Builder for Automated Inspection and its implementation of one direction measurement displacement |
| CN112589534A (en) * | 2021-01-07 | 2021-04-02 | 中铁宝桥（南京）有限公司 | On-line detection equipment and detection method for numerical control drilling machining of turnout rail piece |
| WO2022165654A1 (en) * | 2021-02-03 | 2022-08-11 | 欧菲光集团股份有限公司 | Detection apparatus, camera module and electronic device |
| CN113607419A (en) * | 2021-08-02 | 2021-11-05 | 广东工业大学 | Engine cylinder block electronic tag detection device and method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180323 Termination date: 20190420 |