CN101709958A - Method for measuring salt spray corrosion area of steel plate - Google Patents
Method for measuring salt spray corrosion area of steel plate Download PDFInfo
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- CN101709958A CN101709958A CN200910273212A CN200910273212A CN101709958A CN 101709958 A CN101709958 A CN 101709958A CN 200910273212 A CN200910273212 A CN 200910273212A CN 200910273212 A CN200910273212 A CN 200910273212A CN 101709958 A CN101709958 A CN 101709958A
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Abstract
The invention relates to a method for measuring the salt spray corrosion area of the steel plate, which comprises the following steps of: (1) obtaining a steel plate surface image after a salt spray test with image input equipment, and inputting the image into a computer; (2) obtaining each image data of the inputted image; (3) comparing the grey levels of all pixels of the inputted image with a set grey level; and (4) accumulating areas occupied by the pixels, the grey levels of which are less than the set grey level, to obtain the salt spray corrosion area of the steel plate. The method measures the spray corrosion area with the computer, is not influenced by human factors, and has less error, short time consumption and high efficiency.
Description
Technical field
The present invention relates to steel plate salt mist experiment technical field, particularly measure the method for salt spray corrosion area of steel plate.
Background technology
Along with the continuous increase of the demand of high standard steel plate (as high standard cold-reduced sheet etc.), the workload of steel plate salt mist experiment also rolls up.In the salt mist experiment, need to measure salt spray corrosion area of steel plate (surface of steel plate white rust area), according to the plate salt spray corrosion area steel plate is graded again through salt mist experiment.
At present, measure salt spray corrosion area of steel plate and mainly rely on artificial visually examine's method to carry out, problem such as this method exists that the human factor influence is big, big, the consuming time length of error, efficient are low.
Summary of the invention
Technical matters to be solved by this invention is: a kind of method of measuring salt spray corrosion area of steel plate is provided, and this method is measured salt spray corrosion area by computing machine, not influenced by human factor, little, the consuming time weak point of error, efficient height.
The present invention is adopted solution to be by the problem of the above-mentioned proposition of solution:
A kind of method of measuring salt spray corrosion area of steel plate, it may further comprise the steps:
Step (1), obtain through the surface of steel plate image of salt mist experiment and import computing machine by image input device;
Step (2), obtain each pixel data of input picture;
Step (3), with the gray-scale value of all pixels of input picture with set gray-scale value and compare;
Step (4), gray-scale value in the input picture is added up less than the shared region area of pixel of setting gray-scale value, obtain salt spray corrosion area of steel plate.
In the such scheme, described setting gray-scale value is determined by following steps:
Step (A1), obtain the surface of steel plate image of known salt spray corrosion area and import computing machine by image input device;
Step (A2), obtain each pixel data of input picture;
Step (A3), the gray-scale value of all pixels of input picture and supposition gray-scale value are compared;
Step (A4), with gray-scale value in the input picture less than the supposition gray-scale value the shared region area of pixel add up;
Step (A5), area and known salt spray corrosion area that step (A4) is obtained compare and make following selection:
The area that step (A4) obtains is identical with known salt spray corrosion area, determines that the supposition gray-scale value for setting gray-scale value, finishes;
Or,
Area and known salt spray corrosion area that step (A4) obtains are inequality, revise the supposition gray-scale value, return step (A3).
In the such scheme, described image input device is scanner or digital camera.
Compared with prior art, the inventive method has the following advantages:
1, because the image of the normal part of steel plate is dark, the image of salt air corrosion part is a white, and computing machine is easy to salt spray corrosion area is measured, and not influenced by human factor, little, the consuming time weak point of error, efficient height.In addition, image also can be stored in the computer, for having access at any time.
2, set the definite extremely important of gray-scale value, when using image input device for the first time, or after the long-term use of image input device, all need redefine the setting gray-scale value, to guarantee to measure the accuracy of salt spray corrosion area of steel plate.The inventive method can determine to set gray-scale value rapidly and accurately.
3, equipment needed thereby is simple, and each laboratory all can be adopted.
Description of drawings
Fig. 1 is the process flow diagram of the inventive method embodiment
Fig. 2 is the process flow diagram that the setting gray-scale value of the inventive method is determined
Embodiment
Further introduce the present invention below by embodiment, but embodiment is not construed as limiting the invention.
As shown in Figure 1, the present invention measures the method embodiment of salt spray corrosion area of steel plate, and it may further comprise the steps:
Step (1), obtain through the surface of steel plate image of salt mist experiment and import computing machine by image input device; Image input device is industrial scanner, selects the mensuration zone of steel plate during scanning, image acquisition resolution 300dpi.
Step (2), obtain each pixel data of input picture;
Step (3), with the gray-scale value of all pixels of input picture with set gray-scale value and compare; According to comparing result, input picture is carried out binary conversion treatment.
Step (4), gray-scale value in the input picture is added up less than the shared region area of pixel of setting gray-scale value, obtain salt spray corrosion area of steel plate.
In the foregoing description, select the mensuration zone of steel plate also can in step (2) or step (3), carry out, behind the mensuration zone of selection steel plate, the mensuration area image of steel plate is handled as input picture.
When using image input device for the first time, or after the long-term use of image input device, all need redefine the setting gray-scale value, as shown in Figure 2, set gray-scale value and determine by following steps:
Step (A1), obtain the surface of steel plate image of known salt spray corrosion area and import computing machine by industrial scanner; Select the mensuration zone of steel plate during scanning, the mensuration zone of selection is identical with the steel plate mensuration zone of known salt spray corrosion area, image acquisition resolution 300dpi.
Step (A2), obtain each pixel data of input picture;
Step (A3), the gray-scale value of all pixels of input picture and supposition gray-scale value (120 grades) are compared;
Step (A4), with gray-scale value in the input picture less than the supposition gray-scale value the shared region area of pixel add up;
Step (A5), area and known salt spray corrosion area that step (A4) is obtained compare and make following selection:
The area that step (A4) obtains is identical with known salt spray corrosion area, determines that the supposition gray-scale value for setting gray-scale value, finishes;
Or,
Area and known salt spray corrosion area that step (A4) obtains are inequality, revise the supposition gray-scale value, return step (A3).
The method of revising the supposition gray-scale value is: the area that obtains when step (A4) will reduce and suppose gray-scale value, as 120-1 or 120-2 level during greater than known salt spray corrosion area.The area that obtains when step (A4) will improve the supposition gray-scale value, as 120+1 or 120+2 level during less than known salt spray corrosion area.
In the above-mentioned setting gray-scale value determining step, select the mensuration zone of steel plate also can in step (2) or step (3), carry out, behind the mensuration zone of selection steel plate, the mensuration area image of steel plate is handled as input picture.
Image input device in the inventive method can also be digital camera.
Claims (3)
1. method of measuring salt spray corrosion area of steel plate, it is characterized in that: it may further comprise the steps:
Step (1), obtain through the surface of steel plate image of salt mist experiment and import computing machine by image input device;
Step (2), obtain each pixel data of input picture;
Step (3), with the gray-scale value of all pixels of input picture with set gray-scale value and compare;
Step (4), gray-scale value in the input picture is added up less than the shared region area of pixel of setting gray-scale value, obtain salt spray corrosion area of steel plate.
2. the method for claim 1 is characterized in that: described setting gray-scale value is determined by following steps:
Step (A1), obtain the surface of steel plate image of known salt spray corrosion area and import computing machine by image input device;
Step (A2), obtain each pixel data of input picture;
Step (A3), the gray-scale value of all pixels of input picture and supposition gray-scale value are compared;
Step (A4), with gray-scale value in the input picture less than the supposition gray-scale value the shared region area of pixel add up;
Step (A5), area and known salt spray corrosion area that step (A4) is obtained compare and make following selection:
The area that step (A4) obtains is identical with known salt spray corrosion area, determines that the supposition gray-scale value for setting gray-scale value, finishes;
Or,
Area and known salt spray corrosion area that step (A4) obtains are inequality, revise the supposition gray-scale value, return step (A3).
3. method as claimed in claim 1 or 2 is characterized in that: described image input device is scanner or digital camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200910273212A CN101709958A (en) | 2009-12-15 | 2009-12-15 | Method for measuring salt spray corrosion area of steel plate |
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| CN200910273212A CN101709958A (en) | 2009-12-15 | 2009-12-15 | Method for measuring salt spray corrosion area of steel plate |
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| CN101709958A true CN101709958A (en) | 2010-05-19 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183223A (en) * | 2011-01-13 | 2011-09-14 | 新兴铸管股份有限公司 | Method for determining metal corrosion area |
| CN103063167A (en) * | 2012-12-28 | 2013-04-24 | 江苏大学 | Method for judging laser cleaning effect automatically |
| CN103411875A (en) * | 2013-07-26 | 2013-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Quantitative measurement method for surface corrosion rate of film coated steel plate |
| CN103486985A (en) * | 2013-09-07 | 2014-01-01 | 鞍钢股份有限公司 | Drop-weight tear test sample fracture shearing area detection method |
| CN108414430A (en) * | 2018-03-12 | 2018-08-17 | 唐山国丰钢铁有限公司 | The measuring method of the relatively corrosive area of salt spray test |
| CN109443195A (en) * | 2018-09-11 | 2019-03-08 | 广东工业大学 | A kind of leather detection device and its detection method based on machine vision technique |
| CN111141234A (en) * | 2018-03-01 | 2020-05-12 | 杭州富阳新远新能源有限公司 | Ball seat painting area for automobile ball hinge joint and partition detection method thereof |
-
2009
- 2009-12-15 CN CN200910273212A patent/CN101709958A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183223A (en) * | 2011-01-13 | 2011-09-14 | 新兴铸管股份有限公司 | Method for determining metal corrosion area |
| CN103063167A (en) * | 2012-12-28 | 2013-04-24 | 江苏大学 | Method for judging laser cleaning effect automatically |
| CN103063167B (en) * | 2012-12-28 | 2015-11-18 | 江苏大学 | A kind of method of automatic decision laser cleaning effect |
| CN103411875A (en) * | 2013-07-26 | 2013-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Quantitative measurement method for surface corrosion rate of film coated steel plate |
| CN103486985A (en) * | 2013-09-07 | 2014-01-01 | 鞍钢股份有限公司 | Drop-weight tear test sample fracture shearing area detection method |
| CN111141234A (en) * | 2018-03-01 | 2020-05-12 | 杭州富阳新远新能源有限公司 | Ball seat painting area for automobile ball hinge joint and partition detection method thereof |
| CN111141234B (en) * | 2018-03-01 | 2021-06-04 | 杭州富阳新远新能源有限公司 | Ball seat painting area for automobile ball hinge joint and partition detection method thereof |
| CN108414430A (en) * | 2018-03-12 | 2018-08-17 | 唐山国丰钢铁有限公司 | The measuring method of the relatively corrosive area of salt spray test |
| CN109443195A (en) * | 2018-09-11 | 2019-03-08 | 广东工业大学 | A kind of leather detection device and its detection method based on machine vision technique |
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Application publication date: 20100519 |