CN108253895A - A kind of material surface crackle straight length measuring method based on image procossing - Google Patents
A kind of material surface crackle straight length measuring method based on image procossing Download PDFInfo
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- CN108253895A CN108253895A CN201810155727.5A CN201810155727A CN108253895A CN 108253895 A CN108253895 A CN 108253895A CN 201810155727 A CN201810155727 A CN 201810155727A CN 108253895 A CN108253895 A CN 108253895A
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- image
- test block
- straight length
- crackle
- standard test
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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
Abstract
A kind of material surface crackle straight length measuring method based on image procossing, includes the following steps：（1）Define two-dimensional function of the image for a phase vegetarian refreshments distribution, the pixel image that a width N rows and M are arranged is obtained after sampling；（2）A diameter of d cylindrical standards test block is uprightly positioned on height-adjustable horizontal plane, measurement datum, the flat image of acquisition cylindrical standard test block upper surface are determined as, and the image for acquiring gained is put into step with cylindrical standard test block upper surface（1）Defined in pixel imageIn, two point a, b of excessively same diameter on cylindrical standard test block top image circumference are taken, and rectifying parameter K is calculated；（3）Adjust elevation of water so that the face to be measured of part to be measured is with measurement datum on sustained height；（4）The flat image of tested surface is acquired, and the image for acquiring gained is put into step（1）Defined in pixel imageIn, take the whole story measurement point of crackle；（5）Calculate the distance between measurement point, i.e. crackle straight length L.
Description
Technical field
The present invention relates to a kind of material surface crackle straight length measuring methods based on image procossing.
Background technology
Material easily cracks under stress or environmental activity, the appearance and extension of crackle, makes the mechanical performance of material
It is apparent to be deteriorated.Accurate measure of face crack length is accurate acquisition surface crack growth rate and then material or component is carried out
The basis of remaining life and key technical problem.Existing surface measurement method generally existing measuring apparatus complexity or measurement accuracy
The problem of not high, therefore it is badly in need of that a kind of equipment is simple and measuring method with high accuracy.
Invention content
The technical problems to be solved by the invention are just to provide a kind of material surface crackle length based on image procossing
Spend measuring method, measuring apparatus required by this method is simple and high certainty of measurement.
Above-mentioned technical problem is solved, the technical solution adopted by the present invention is as follows：
A kind of material surface crackle straight length measuring method based on image procossing, it is characterized in that including the following steps：
(1) image the two-dimensional function f (x, y) for a phase vegetarian refreshments distribution, wherein x, y is defined to be respectively that plane is horizontal, indulge and sit
Mark obtains the pixel image of a width N rows and M row after being sampled to piece image f (x, y)；
(2) a diameter of d cylindrical standards test block is uprightly positioned on height-adjustable horizontal plane, with cylindrical standard
Test block upper surface is determined as measurement datum, the flat image of acquisition cylindrical standard test block upper surface, and will acquire gained
Image is put into the pixel image f (x, y) defined in step (1), is taken excessively same on cylindrical standard test block top image circumference
Two point a of diameter, b, coordinate is respectively (xa, ya), (xb, yb), and rectifying parameter K is calculated,
(3) elevation of water is adjusted so that the face to be measured of part to be measured is with measurement datum on sustained height；
(4) flat image of tested surface is acquired, and the image for acquiring gained is put into the pixel image defined in step (1)
In f (x, y), the whole story measurement point of crackle is taken, coordinate is respectively f (x1,y1), f (x2,y2)；
(5) measurement point f (x are calculated1,y1), f (x2,y2The distance between), i.e. crackle straight length L.
Preferably, a, the coordinate that 2 points of b take y in step (2)a=yb, then correction coefficient
The present invention by be introduced into correction coefficient K can effectively correct in measurement process again in the image collected 2 points away from
Existing error between with a distance from material object 2 points
The beneficial effects of the invention are as follows：Material surface crackle straight length of the present invention based on image procossing measures
Method, equipment requirement is simple, easy to operate, easy left-hand seat, and measurement is fast, precision is high and stablizes, strong applicability.
Description of the drawings
The present invention is described in further detail in the following with reference to the drawings and specific embodiments：
Fig. 1 is the equipment schematic diagram of the present invention；
Fig. 2,3 be measuring method of the present invention schematic diagram.
Reference numeral represents as follows：1- lifting supports, 2- measurement datums, 3- image acquisition devices, 4- columns, 5- are cylindrical
Reference block, 6- parts to be measured, 7- phase vegetarian refreshments, 8- crackles, 9- crackle straight lengths
Specific embodiment
As shown in Figure 1, 2, the material surface crackle straight length measuring method based on image procossing is specific as follows：
(1) the two-dimensional function f (x, y) that image is distributed for a phase vegetarian refreshments 7 is defined, wherein x, y are respectively that plane is horizontal, indulge and sit
Mark obtains the pixel image of a width N rows and M row after being sampled to piece image f (x, y)；
(2) a diameter of d cylindrical standards test block is uprightly positioned on lifting support 1, by adjusting lifting support 1, with
Image acquisition device 3 is enabled clearly to collect the image of 5 upper surface of cylindrical standard test block, and in cylindrical standard test block 5
Surface determines measurement datum 2, and the height of measurement datum 2 is recorded by the graduation mark on column 4；Pass through image acquisition device 3
The flat image of 5 upper surface of cylindrical standard test block is acquired, and the image for acquiring gained is put into the pixel defined in step (1)
In image f (x, y), two point a of excessively same diameter on 5 top image circumference of cylindrical standard test block, b are taken, coordinate is respectively
(xa, ya), (xb, yb), because of ya=yb, obtain the correction coefficient on the measurement datum 2
(3) part 6 to be measured is put on lifting support 1, adjusts lifting support 1 so that the face to be measured of part 6 to be measured is with measuring
Datum level 2 is on sustained height；
(4) as shown in figure 3, acquiring the flat image of tested surface, and the image for acquiring gained is put into defined in step (1)
Pixel image f (x, y) in, take the whole story measurement point of crackle, coordinate is respectively f (x1,y1), f (x2,y2)；
(5) measurement point f (x are calculated1,y1), f (x2,y2The distance between), i.e. crackle straight length L.
Claims (2)
1. a kind of material surface crackle straight length measuring method based on image procossing, which is characterized in that include the following steps：
（1）Define two-dimensional function of the image for a phase vegetarian refreshments distribution, wherein x, y are respectively that plane is horizontal, ordinate, right
Piece imageThe pixel image of a width N rows and M row is obtained after sampling；
（2）A diameter of d cylindrical standards test block is uprightly positioned on height-adjustable horizontal plane, with cylindrical standard test block
Upper surface is determined as measurement datum, the flat image of acquisition cylindrical standard test block upper surface, and the image that will acquire gained
It is put into step（1）Defined in pixel imageIn, take excessively same diameter on cylindrical standard test block top image circumference
Two point a, b, coordinate is respectively（,）,（,）, and rectifying parameter K is calculated,；
（3）Adjust elevation of water so that the face to be measured of part to be measured is with measurement datum on sustained height；
（4）The flat image of tested surface is acquired, and the image for acquiring gained is put into step（1）Defined in pixel imageIn, the whole story measurement point of crackle is taken,,；
（5）Calculate measurement point,The distance between, i.e. crackle straight length L,。
2. the material surface crackle straight length measuring method according to claim 1 based on image procossing, feature exist
In in step（2）The coordinate that 2 points of middle a, b takes, then correction coefficient。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810155727.5A CN108253895A (en) | 2018-02-23 | 2018-02-23 | A kind of material surface crackle straight length measuring method based on image procossing |
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| CN201810155727.5A CN108253895A (en) | 2018-02-23 | 2018-02-23 | A kind of material surface crackle straight length measuring method based on image procossing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109459502A (en) * | 2018-12-03 | 2019-03-12 | 森松（江苏）重工有限公司 | A kind of support frame for holding multiple pieces TOFD reference block |
| CN110155369A (en) * | 2019-05-29 | 2019-08-23 | 中国民航大学 | A kind of aircraft skin face crack inspection method |
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| CN107300360A (en) * | 2017-08-10 | 2017-10-27 | 山西农业大学 | A kind of shaft size fast algorithm of detecting of rain fed crops seed three |
| CN107369136A (en) * | 2017-06-22 | 2017-11-21 | 福建省万龙新材料科技有限公司 | Composite polycrystal-diamond face crack visible detection method |
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| CN102778196A (en) * | 2011-05-10 | 2012-11-14 | 长春理工大学 | Image size measuring method based on laser calibration |
| CN102680480A (en) * | 2012-05-03 | 2012-09-19 | 中南大学 | Intelligent detecting method for cracks of concrete structures |
| CN102692188A (en) * | 2012-05-08 | 2012-09-26 | 浙江工业大学 | Dynamic crack length measurement method for machine vision fatigue crack propagation test |
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| CN107369136A (en) * | 2017-06-22 | 2017-11-21 | 福建省万龙新材料科技有限公司 | Composite polycrystal-diamond face crack visible detection method |
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| CN109459502A (en) * | 2018-12-03 | 2019-03-12 | 森松（江苏）重工有限公司 | A kind of support frame for holding multiple pieces TOFD reference block |
| CN110155369A (en) * | 2019-05-29 | 2019-08-23 | 中国民航大学 | A kind of aircraft skin face crack inspection method |
| CN110155369B (en) * | 2019-05-29 | 2022-05-17 | 中国民航大学 | Method for checking surface cracks of aircraft skin |
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Application publication date: 20180706 |
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