CN109238156A - Backlight image-type roller root bottom part chamfering measurement method - Google Patents
Backlight image-type roller root bottom part chamfering measurement method Download PDFInfo
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- CN109238156A CN109238156A CN201810842059.3A CN201810842059A CN109238156A CN 109238156 A CN109238156 A CN 109238156A CN 201810842059 A CN201810842059 A CN 201810842059A CN 109238156 A CN109238156 A CN 109238156A
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- China
- Prior art keywords
- image
- bottom part
- roller
- root bottom
- ccd camera
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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
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/80—Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30108—Industrial image inspection
- G06T2207/30164—Workpiece; Machine component
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Theoretical Computer Science (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
A kind of backlight image-type roller root bottom part chamfering measurement method, the side of roller workpiece to be measured is irradiated using source of parallel light, CCD camera by being located at the roller workpiece other side obtains roller workpiece guide post root bottom part chamfer image, the image that the CCD camera will acquire is sent into host computer and is handled, the pretreatment of region of interesting extraction and Canny edge extracting is done using the image that host computer captures CCD camera；Round fitting is carried out using least square method to pretreated image, and extracts radius of circle Pixel Dimensions；Using the variation relation of obtained image coordinate system to world coordinate system, the radius of circle Pixel Dimensions of acquisition are converted into actual size, to obtain the parameter of roller workpiece guide post root bottom part chamfering.The present invention is based on computer vision techniques, have the characteristics of quick, accurate, versatile, automation, can provide specific measured value, and commercial measurement and scientific research is facilitated to use.
Description
Technical field
The present invention relates to a kind of roller root bottom part chamfering measurement methods.Computer vision technique is based on more particularly to one kind
Backlight image-type roller root bottom part chamfering measurement method
Background technique
Continuous promotion with people to textile product demand, modern textile technology is to Automation in Mechanical Working degree and essence
The requirement of degree is also being continuously improved, and to weaving workpiece sensing technology, higher requirements are also raised.Different types of roller is certainly
Important axial workpiece in dynamic textile machinery, the geometric sense parameter of roller directly affect the production efficiency of textile machinery.Currently,
The production of roller mainly uses the processing technology of turning, and this technique can not process the root bottom part of roller junction in high precision
Shape and size, therefore, the crucial geometric dimension precision measurement and detection of roller junction root bottom part chamfering is for guaranteeing roller work
The securely and reliably work made is particularly important.Since the structure of roller itself is in the whole body cylindricality, chamfering feature is small.Currently, weaving
In boundary to the detection method of roller root bottom part chamfering mainly based on the method for manual sampling Detection, by the standard of roller and production
Mold ring qualitatively compares, and whether calibrating roller is qualified, and this detection method cannot get the accurate geometrical characteristic of root bottom part, and
Speed is slow, low efficiency, and human error is big.In addition calibrating mold is prone to wear, and causes the precision of calibrating cannot be guaranteed, therefore urgently
Must be a kind of quick, accurate, the measuring system of automatic roller root bottom part geometrical characteristic parameter.
Contact and contactless two class are broadly divided into the measurement of small-sized chamfering geometric dimension both at home and abroad.Based on contact
Measurement method using measurement of coordinates formula as representative, by contact probe to workpiece surface carry out multi-point sampling, obtain sampled point
Coordinate is converted to measured geometric element size, shape and relative position according to the calculating of the coordinate position to point set.It connects
Touch measurement accuracy is high, and can measure to complex-shaped workpieces, but measuring speed is slow, low efficiency, at high cost, and
Measurement object is limited to the size of gauge head size, it is difficult to using the measurement of the small-sized chamfering of circular shaft type weaving workpiece.It is contactless
Measurement method be based primarily upon machine vision technique, by combining multiple CCD cameras, measured workpiece is scanned and obtains monolithic wheel
Exterior feature carries out image procossing and Data Integration by the overall profile to workpiece to extract characteristic parameter to be measured.It is regarded based on computer
The small-sized chamfering measuring system felt depends on the accurate placement of chamfering, i.e. chamfer plane is parallel with camera plane.But for being difficult to
Determine the cylindrical body weaving workpiece of chamfer plane, the method has in camera focus process to acquire a certain degree of difficulty, it is difficult to adapt to industry
Detection is quick, automatically, accurate requirement.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of quick, accurate, versatile, automation backlight shadows
As formula roller root bottom part chamfering measurement method.
The technical scheme adopted by the invention is that: a kind of backlight image-type roller root bottom part chamfering measurement method, using flat
Line light source irradiates the side of roller workpiece to be measured, and the CCD camera by being located at the roller workpiece other side obtains roller workpiece guide post
Root bottom part chamfer image, the image that the CCD camera will acquire are sent into host computer and are handled, specifically comprised the following steps:
1) source of parallel light illumination is opened, CCD camera is demarcated using Zhang Zhengyou scaling board, image coordinate system is obtained and arrives
The variation relation of world coordinate system；
2) Zhang Zhengyou scaling board is removed, roller workpiece is placed on supporting element, and roller workpiece guide post root bottom part is made to fall
Corner contours plane is identical as Zhang Zhengyou scaling board plane position in step 1), and control CCD camera captures roller workpiece guide post
Root bottom part chamfer image；
3) the pre- of region of interesting extraction and Canny edge extracting is done using the image that host computer captures CCD camera
Processing；
4) round fitting is carried out using least square method to the pretreated image of step 3), and extracts radius of circle pixel ruler
It is very little；
5) variation relation of the image coordinate system obtained using step 1) to world coordinate system, the circle that step 4) is obtained half
Diameter Pixel Dimensions are converted into actual size, to obtain the parameter of roller workpiece guide post root bottom part chamfering.
Source of parallel light guarantees parallel rays and roller workpiece guide post root bottom part chamfering profile when irradiating roller workpiece to be measured
Plane is vertical.
The plane of roller workpiece guide post root bottom part chamfering profile is vertical with the optical axis of CCD camera camera lens.
Backlight image-type roller root bottom part chamfering measurement method of the invention, be based on computer vision technique, have quickly,
Accurately, versatile, the characteristics of automation, specific measured value can be provided, commercial measurement and scientific research is facilitated to use.This
Invention has the characteristics that following specific:
1, measure convenience: compared to the contact measurement of sonde-type, this measurement method be it is non-contact, avoid gauge head
Wear bring measurement inaccuracy and limitation of the gauge head own dimensions to measurement range.The shooting process of radiographic measurement is compared simultaneously
It is more convenient in the multi-point sampling of gauge head.
2, measurement it is general: measurement method according to the present invention can design for shaft-like chamfering of different specifications and sizes into
Row measurement, the measuring device of different size is selected according to the range of chamfering to be measured.
3, it the accuracy measured: is handled using camera acquisition image, since the extraction of edge contour reaches sub-pix
The precision of rank, radiographic measurement is very high, while fitting circle has had mature mathematical algorithm.Therefore pass through the radius of circle of fitting circle
Characterize the size of the radius of roller chamfering to be measured.
4, the safety measured: during measurement be non-contact being measurement, will not damage workpiece for measurement.
Detailed description of the invention
Fig. 1 is backlight image-type roller root bottom part chamfering measure setup schematic diagram of the invention；
Fig. 2 is backlight image-type roller root bottom part chamfering measure setup floor map of the invention；
Fig. 3 is the effect picture for the roller workpiece guide post root bottom part chamfer image that the present invention obtains.
In figure
1: source of parallel light 2: roller workpiece
3:CCD camera 4: host computer
Specific embodiment
Backlight image-type roller root bottom part chamfering measurement method of the invention is made in detail below with reference to embodiment and attached drawing
It describes in detail bright.
As shown in Figure 1 and Figure 2, backlight image-type roller root bottom part chamfering measurement method of the invention, uses source of parallel light 1
The side for irradiating roller workpiece 2 to be measured, the CCD camera 3 by being located at 2 other side of roller workpiece obtain 2 guide post root of roller workpiece
Bottom chamfer image, image that the CCD camera 3 will acquire are sent into host computer 4 and are handled, wherein the irradiation of source of parallel light 1 to
Guarantee that parallel rays is vertical with the plane of 2 guide post root bottom part chamfering profile of roller workpiece when surveying roller workpiece 2.Roller workpiece guide post
The plane of root bottom part chamfering profile is vertical with the optical axis of CCD camera camera lens.
Backlight image-type roller root bottom part chamfering measurement method of the invention, specifically comprises the following steps:
1) source of parallel light illumination is opened, CCD camera is demarcated using Zhang Zhengyou scaling board, image coordinate system is obtained and arrives
The variation relation of world coordinate system；
2) Zhang Zhengyou scaling board is removed, roller workpiece is placed on supporting element, and roller workpiece guide post root bottom part is made to fall
Corner contours plane is identical as Zhang Zhengyou scaling board plane position in step 1), and control CCD camera captures roller workpiece guide post
Root bottom part chamfer image；
3) the pre- of region of interesting extraction and Canny edge extracting is done using the image that host computer captures CCD camera
Processing；
4) round fitting is carried out using least square method to the pretreated image of step 3), and extracts radius of circle pixel ruler
It is very little；
5) variation relation of the image coordinate system obtained using step 1) to world coordinate system, the circle that step 4) is obtained half
Diameter Pixel Dimensions are converted into actual size, to obtain the parameter of roller workpiece guide post root bottom part chamfering.
Claims (3)
1. a kind of backlight image-type roller root bottom part chamfering measurement method, which is characterized in that irradiated using source of parallel light (1) to be measured
The side of roller workpiece (2), the CCD camera (3) by being located at roller workpiece (2) other side obtain roller workpiece (2) guide post root
Bottom chamfer image, the image that the CCD camera (3) will acquire are sent into host computer (4) and are handled, and following step is specifically included
It is rapid:
1) source of parallel light illumination is opened, CCD camera is demarcated using Zhang Zhengyou scaling board, obtains image coordinate system to the world
The variation relation of coordinate system；
2) Zhang Zhengyou scaling board is removed, roller workpiece is placed on supporting element, and makes roller workpiece guide post root bottom part chamfering wheel
Wide plane is identical as Zhang Zhengyou scaling board plane position in step 1), and control CCD camera captures roller workpiece guide post foundation
Portion's chamfer image；
3) the pre- place of region of interesting extraction and Canny edge extracting is done using the image that host computer captures CCD camera
Reason；
4) round fitting is carried out using least square method to the pretreated image of step 3), and extracts radius of circle Pixel Dimensions；
5) variation relation of the image coordinate system obtained using step 1) to world coordinate system, the radius of circle picture that step 4) is obtained
Plain size conversion is at actual size, to obtain the parameter of roller workpiece guide post root bottom part chamfering.
2. backlight image-type roller root bottom part chamfering measurement method according to claim 1, which is characterized in that source of parallel light
(1) guarantee that the plane of parallel rays and roller workpiece (2) guide post root bottom part chamfering profile is hung down when irradiating roller workpiece (2) to be measured
Directly.
3. backlight image-type roller root bottom part chamfering measurement method according to claim 1, which is characterized in that roller workpiece
(2) plane of guide post root bottom part chamfering profile is vertical with the optical axis of CCD camera camera lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810842059.3A CN109238156A (en) | 2018-07-27 | 2018-07-27 | Backlight image-type roller root bottom part chamfering measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810842059.3A CN109238156A (en) | 2018-07-27 | 2018-07-27 | Backlight image-type roller root bottom part chamfering measurement method |
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| CN109238156A true CN109238156A (en) | 2019-01-18 |
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| CN201810842059.3A Pending CN109238156A (en) | 2018-07-27 | 2018-07-27 | Backlight image-type roller root bottom part chamfering measurement method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424088A (en) * | 2013-08-12 | 2013-12-04 | 韵升控股集团有限公司 | Chamfer testing method and chamfer measuring instrument |
| CN106152898A (en) * | 2016-08-24 | 2016-11-23 | 安徽华茂纺织股份有限公司 | Fly frame front roller passes in and out set pattern calibration equipment end to end |
| JP2016223883A (en) * | 2015-05-29 | 2016-12-28 | 日本電気硝子株式会社 | Inspection method of glass tube |
| CN106705883A (en) * | 2016-12-29 | 2017-05-24 | 苏州逸美德科技有限公司 | Circular hole chamfering radian measuring device and method |
-
2018
- 2018-07-27 CN CN201810842059.3A patent/CN109238156A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424088A (en) * | 2013-08-12 | 2013-12-04 | 韵升控股集团有限公司 | Chamfer testing method and chamfer measuring instrument |
| JP2016223883A (en) * | 2015-05-29 | 2016-12-28 | 日本電気硝子株式会社 | Inspection method of glass tube |
| CN106152898A (en) * | 2016-08-24 | 2016-11-23 | 安徽华茂纺织股份有限公司 | Fly frame front roller passes in and out set pattern calibration equipment end to end |
| CN106705883A (en) * | 2016-12-29 | 2017-05-24 | 苏州逸美德科技有限公司 | Circular hole chamfering radian measuring device and method |
Non-Patent Citations (1)
| Title |
|---|
| 张辉: "汽车发动机曲轴多参数影像测量技术研究", 《汽车发动机曲轴多参数影像测量技术研究》 * |
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Application publication date: 20190118 |
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