CN115029704B - Intelligent control method and device for stainless steel pickling process - Google Patents
Intelligent control method and device for stainless steel pickling process Download PDFInfo
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- 238000005554 pickling Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 47
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 43
- 239000010935 stainless steel Substances 0.000 title claims abstract description 43
- 230000003647 oxidation Effects 0.000 claims abstract description 130
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 130
- 239000011159 matrix material Substances 0.000 claims abstract description 22
- 239000002253 acid Substances 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 238000005286 illumination Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000011218 segmentation Effects 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- JVEVIFRPMAXOFM-UHFFFAOYSA-N [Fe].[P]=O Chemical group [Fe].[P]=O JVEVIFRPMAXOFM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention relates to the field of identification methods by using electronic equipment, in particular to an intelligent control method and device for a stainless steel pickling process, wherein the method comprises the following steps: acquiring an image to be detected and a standard image; obtaining a gradient difference image according to the image to be detected and the gradient image corresponding to the standard image; selecting a target image from the standard image according to the gradient co-occurrence matrix of the image to be detected and the gradient co-occurrence matrix of each gradient difference image; acquiring a reference gray value according to the target image; acquiring a gradient difference value of the image to be detected, and calculating the oxidation degree in the image to be detected according to the gradient difference value and a reference gray value; according to the method, the pickling time of the oxidation area corresponding to the oxidation degree is adjusted according to the oxidation degree, and the pickling time of the areas corresponding to different oxidation degrees is adjusted, so that the pickling effect of the stainless steel surface is improved.
Description
Technical Field
The invention relates to the technical field of intelligent detection of electronic equipment, in particular to an intelligent control method and device for a stainless steel pickling process.
Background
In the processes of heating, rough rolling and finish rolling of the plate blank, the surface of the stainless steel can be oxidized to generate iron scale, and the iron scale can be firmly covered on the surface of the strip steel. During storage, if not stored properly, oxide will also be produced on the surface. According to the use requirements which can also occur on the surface of the steel, the steel is usually subjected to processes such as cold rolling or hot dipping, and the like, but before the cold rolling or hot dipping process, oxides on the surface of stainless steel must be removed by acid cleaning so as to ensure the quality of the cold rolling and hot dipping.
However, the short pickling time can cause that the oxide skin on the surface of the steel cannot be completely removed, and the defect of insufficient pickling is formed; if the pickling speed is too slow and the corresponding pickling time is too long, the steel surface is over-corroded to form an over-pickling defect. Therefore, speed control of the pickling section is very important.
The existing pickling time control method usually depends on experience values of workers to set unified pickling time, but because the oxidation degrees of different parts of stainless steel in the production, transportation and storage processes are different, only the unified pickling time experience values are used, when pickling is carried out on an area with small oxidation degree on the surface of steel, over-pickling or under-pickling is possibly caused, and the pickling quality of different oxidation areas of the steel can be influenced by using the unified pickling time.
Therefore, it is necessary to provide a method and a device for identifying and processing stainless steel pickling process by electronic equipment to realize intelligent control.
Disclosure of Invention
The invention provides an intelligent control method and device for a stainless steel pickling process, and aims to solve the existing problems.
The invention relates to an intelligent control method for a stainless steel pickling process, which adopts the following technical scheme: the method comprises the following steps:
acquiring an image to be detected on the surface of the stainless steel and a plurality of standard images qualified by acid washing;
acquiring an image to be detected and a gradient image corresponding to each standard image, and obtaining a plurality of corresponding gradient difference images according to the gradient image of the image to be detected and the gradient image of each standard image;
acquiring a first entropy value of a gradient co-occurrence matrix corresponding to an image to be detected and a second entropy value of the gradient co-occurrence matrix corresponding to each gradient difference image, calculating a difference value between the first entropy value and each second entropy value, acquiring all gradient difference images corresponding to the difference values larger than 0, and marking a standard image corresponding to each gradient difference image corresponding to the difference value larger than 0 as a target image;
acquiring reference gray values according to all target images;
acquiring a gradient difference value of a region corresponding to each pixel point in the image to be detected, and calculating the oxidation degree of a central pixel point corresponding to each region in the image to be detected according to the gradient difference value and a reference gray value;
clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas, recording the clustering areas as oxidation areas, and adjusting the pickling time of each oxidation area according to the oxidation degree and the pickling solution concentration corresponding to each oxidation area and by combining the corresponding oxidation degree and the corresponding pickling solution concentration in the historical data.
Further, the step of obtaining a plurality of corresponding gradient difference images according to the gradient image of the image to be detected and the gradient image of each standard image includes:
respectively obtaining a gradient image corresponding to an image to be detected and gradient values and gradient directions corresponding to pixel points in the gradient image corresponding to each standard image;
and (3) carrying out difference on the gradient value and the gradient direction corresponding to the image to be detected and the gradient value and the gradient direction corresponding to each standard image to obtain a plurality of gradient difference images.
Further, the step of obtaining the reference gray value according to the entropy of the image to be detected, the entropy of each target image and the average gray value of each target image includes:
acquiring a gray level histogram of each target image after normalization;
determining the average gray value of the target image according to the gray levels in the gray histogram and the proportion of each gray level;
and taking the difference value between the corresponding entropy value of the image to be detected and the corresponding entropy value of each target image as weight, and carrying out weighted calculation on the average gray value of each target image to obtain a reference gray value.
Further, the step of obtaining the gradient difference value of the corresponding region of each pixel point in the image to be detected comprises:
acquiring a sliding window area image by taking each pixel point in the detection image as a central pixel point;
and obtaining the gradient difference value of the region corresponding to the central pixel point according to the gradient vector and the gradient value of each pixel point in each sliding window region image and the gradient vector and the gradient value corresponding to the central pixel point.
Further, the step of calculating the oxidation degree of the central pixel point corresponding to each region in the image to be detected according to the gradient difference value and the reference gray value comprises the following steps:
calculating the oxidation degree of each pixel point in the image to be detected according to the following formula (1):
wherein,
for the first in the image to be detected
The oxidation degree of each central pixel point;
for the first image except the central pixel point in the current sliding window area image
Gradient direction of each pixel point;
for the first image except the central pixel point in the current sliding window area image
Gradient values of the individual pixel points;
for the first in the image to be detected
The gray value of each central pixel point;
is a reference gray value.
Further, the step of clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas and marking the clustering areas as oxidation areas comprises:
carrying out first clustering on the oxidation degree of each pixel point to obtain a plurality of primary clustering results, wherein each clustering result corresponds to one oxidation degree;
performing secondary clustering on the primary clustering result to obtain a secondary clustering result;
and taking the secondary clustering result as a minimum enclosure frame, wherein each minimum enclosure frame region corresponds to an oxidation region.
Further, the step of adjusting the pickling time of each oxidation area according to the oxidation degree and the pickling solution concentration corresponding to each oxidation area and combining the corresponding oxidation degree and the corresponding pickling solution concentration in the historical data comprises the following steps:
establishing a database according to the same oxidation degree, the same pickling solution concentration and the same oxidation degree of the stainless steel image which is qualified in pickling in the historical data and the time average value of all pickling time under the same pickling solution concentration;
matching the oxidation degree and the pickling solution concentration corresponding to the oxidation area of the image to be detected with the data in the database to obtain the pickling time average value corresponding to the same oxidation degree and the same pickling solution concentration in the database;
and taking the acid washing time average value as the adjustment value of the acid washing time of each corresponding oxidation area to adjust the acid washing time of the oxidation area.
The invention also discloses an intelligent control device for the stainless steel pickling process, which comprises the following components: the acquisition module is used for acquiring an image to be detected on the surface of the stainless steel and a plurality of standard images qualified in acid washing;
the first image processing module is used for respectively subtracting the gradient image of the image to be detected and the gradient image of each standard image to obtain a plurality of corresponding gradient difference images;
the second image processing module is used for acquiring a first entropy value of a gradient co-occurrence matrix corresponding to an image to be detected and a second entropy value of the gradient co-occurrence matrix corresponding to each gradient difference image, calculating a difference value between the first entropy value and each second entropy value, acquiring all gradient difference images corresponding to the difference values larger than 0, and marking a standard image corresponding to each gradient difference image corresponding to the difference value larger than 0 as a target image;
the first parameter calculation module is used for acquiring the average gray value of each target image and acquiring a reference gray value according to the average gray value of each target image;
the second parameter calculation module is used for acquiring a gradient difference value of a region corresponding to each pixel point in the image to be detected and calculating the oxidation degree of a central pixel point corresponding to each region in the image to be detected according to the gradient difference value and a reference gray value;
the adjusting module is used for clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas and marking the clustering areas as oxidation areas, and adjusting the pickling time of each oxidation area according to the oxidation degree and the pickling solution concentration corresponding to the oxidation areas
The invention has the beneficial effects that: the invention relates to an intelligent control method and a device for a stainless steel pickling process, which are used for acquiring an image to be detected on the surface of a stainless steel material, processing the image to be detected to obtain a standard image which is qualified in pickling and is similar to the image to be detected, determining a reference gray value by using the standard image and the image to be detected, determining the oxidation degree corresponding to each oxidation area of the image to be detected according to the reference gray value and the gradient difference value of the image to be detected, and then adjusting the pickling time of each oxidation area according to the oxidation degree and the concentration of pickling solution corresponding to each oxidation area and combining the corresponding oxidation degree and the concentration of the pickling solution in historical data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of the general steps of an embodiment of an intelligent control method for a stainless steel pickling process of the present invention;
fig. 2 is a flowchart of specifically obtaining a target image in step S3 in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the intelligent control method for the stainless steel pickling process of the invention is shown in figure 1, and the method comprises the following steps:
s1, obtaining an image to be detected of the surface of a stainless steel material and a plurality of standard images qualified in acid washing; specifically, an RGB camera is used for collecting a photo to be detected of the surface of the stainless steel material to be detected and a plurality of qualified photos of the surface of the stainless steel material which is qualified after acid washing, the photo to be detected is processed through a semantic segmentation technology to obtain an image to be detected which only contains the steel material part, and the semantic segmentation technology is also used for processing a plurality of standard images which are qualified after acid washing to obtain a standard image which only contains the steel material part.
S2, after the steel is oxidized, the color of the surface of the steel changes, and the color depths of oxides with different oxidation degrees are different, so that the larger the gray difference between the image to be detected and a standard image is, the larger the oxidation degree is; in addition, due to the influence of illumination factors, when the illumination environments of the standard image and the image to be detected are different, the obtained gray level difference comprises the difference caused by different illumination, in order to avoid the inaccuracy of the detection result, firstly, the gradient image corresponding to the image to be detected and each standard image is obtained, and a plurality of corresponding gradient difference images are obtained according to the gradient image of the image to be detected and the gradient image of each standard image; specifically, a gradient image corresponding to the image to be detected and a gradient value and a gradient direction corresponding to a pixel point in a gradient image corresponding to each standard image are respectively obtained, that is, sobel gradient detection is performed on the image to be detected and each standard image to obtain a corresponding gradient image, and a gradient value and a gradient direction corresponding to a pixel point in the gradient image; and subtracting the gradient value and the gradient direction corresponding to the image to be detected from the gradient value and the gradient direction corresponding to each standard image to obtain a plurality of gradient difference images.
S3, respectively obtaining an image to be detected and a gradient co-occurrence matrix corresponding to each gradient difference image, specifically, counting the gradient direction of each pixel point in the gradient image corresponding to the image to be detected, obtaining a gradient co-occurrence matrix of all pixels in the gradient image in the direction of 0 degrees according to each gradient direction in the range of the gradient direction as the direction grade of the gradient co-occurrence matrix, wherein the gradient co-occurrence matrix is used for representing the times of the occurrence of pixel pairs of different pixel points in the image in the corresponding gradient direction, normalizing the obtained gradient co-occurrence matrix, calculating the entropy value of the gradient co-occurrence matrix, selecting a plurality of target images from a plurality of standard images according to the gradient co-occurrence matrix of the image to be detected and the gradient co-occurrence matrix of each gradient difference image, and specifically, as shown in FIG. 2, obtaining a first entropy value of the gradient co-occurrence matrix corresponding to the image to be detected and a second entropy value of the gradient co-occurrence matrix corresponding to each gradient difference image; calculating a difference value between the first entropy value and each second entropy value; acquiring all gradient difference images corresponding to the difference value larger than 0; and recording the standard image corresponding to each gradient difference image as a target image.
S4, acquiring a reference gray value according to the entropy of the image to be detected, the entropy of each target image and the average gray value of each target image; specifically, a gray level histogram of each target image after normalization is obtained; determining the average gray value of the target image according to the gray levels in the gray histogram and the proportion of each gray level; and taking the difference value between the corresponding entropy value of the image to be detected and the corresponding entropy value of each target image as weight, and carrying out weighted calculation on the average gray value of each target image to obtain a reference gray value.
S5, obtain the gradient difference value in the image of waiting to examine every pixel corresponding region, because stainless steel surface oxidation back, color change can appear in its surface, and the environment that takes place according to the oxidation is different, generally can produce two kinds of different oxides: the oxide generated in the humid environment at normal temperature is rust which is reddish brown; the other is the oxide iron sheet generated at high temperature, commonly called as iron scale, which is dark black. Wherein the gray scale value of rust is higher and the gray scale value of iron phosphorus is lower than that of the normal area. Therefore, the degree of oxidation can be judged according to the degree of color change; when the color of the pixel point is black, namely the gray value is smaller than that of the normal area, the possibility that the point is iron-phosphorus oxide is high; when the color of the pixel point is red, namely the gray value is larger than that of the normal area, the possibility that the point is the rust oxide is high; considering that a normal area is smooth and has a low oxidation degree, a bright illumination area exists on the surface of the normal area, and gray scale difference can also be formed, namely, the oxidation degree of each position cannot be correctly judged only according to the gray scale difference, and the illumination area is different from a rust oxidation area in that rust oxide can form rust particles on the surface of stainless steel, so that the flatness of the surface of the stainless steel is damaged, and the gradient difference value of the surface of steel is increased. Therefore, when the oxidation degree of the pixel points with the gray values larger than the gray value of the normal region is evaluated, the comprehensive judgment needs to be carried out by combining the gradient difference values of the pixel points, so that the oxidation degree of the central pixel point corresponding to each region in the image to be detected is calculated according to the gradient difference values and the reference gray value; specifically, the step of obtaining the gradient difference value of the corresponding region of each pixel point in the image to be detected comprises: obtaining a sliding window area image by taking each pixel point in the detection image as a central pixel point, and obtaining a gradient difference value of a region corresponding to the central pixel point according to the gradient vector and the gradient value of each pixel point in each sliding window area image and the gradient vector and the gradient value of the pixel point corresponding to the central pixel point; specifically, the step of calculating the oxidation degree of the central pixel point corresponding to each region in the image to be detected according to the gradient difference value and the reference gray value comprises the following steps: calculating the oxidation degree of each pixel point in the image to be detected according to the following formula (1):
wherein,
for the first in the image to be detected
Each central pixel point
The degree of oxidation;
for the first image except the central pixel point in the current sliding window area image
Gradient direction of each pixel point;
the first pixel point except the central pixel point in the current sliding window area image
Gradient values of the individual pixel points;
is the first in the image to be detected
The gray value of each central pixel point;
is a reference gray scale value;
is shown as
The difference degree of the gray value of each pixel point relative to the reference gray value under normal conditions
Approaching to 1, when the point is the scale oxide, the gray value corresponding to the pixel point is less than the reference gray value, that is, the gray value is
And the larger the value, the more obvious the blackening degree and the larger the oxidation degree; when the point is rust oxide, the gray value corresponding to the pixel point is greater than the reference gray value, namely
And the smaller the value, the greater the degree of oxidation; however, since there may be an influence of light, and the gray value of the light area is also larger than the reference gray value,
is shown as
The larger the gradient complexity of each pixel point is, the larger the gradient fluctuation of each pixel point relative to the central pixel point in the sliding window area where the pixel point is located is, the more complicated the gradient distribution is, namely, the more uneven the peripheral area of the pixel point is, and the larger the corresponding gradient difference value is.
S6, clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas, marking as oxidation areas, and adjusting the pickling time of each oxidation area according to the oxidation degree and the pickling solution concentration corresponding to each oxidation area and by combining the oxidation degree and the pickling solution concentration corresponding to the historical data; specifically, the step of clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas and marking the clustering areas as oxidation areas comprises: carrying out first clustering on the oxidation degree of each pixel point to obtain a plurality of primary clustering results, wherein each clustering result corresponds to one oxidation degree; performing secondary clustering on the primary clustering result to obtain a secondary clustering result; taking the secondary clustering result as a minimum enclosure frame, wherein each minimum enclosure frame region corresponds to an oxidation region; specifically, the step of adjusting the pickling time of each oxidation area according to the oxidation degree and the pickling solution concentration corresponding to each oxidation area and combining the corresponding oxidation degree and the corresponding pickling solution concentration in the historical data comprises the following steps: establishing a database according to the same oxidation degree, the same pickling solution concentration and the same oxidation degree of the stainless steel image qualified by pickling in the historical data and the time average value of all pickling times under the same pickling solution concentration; matching the oxidation degree and the pickling solution concentration corresponding to the oxidation area of the image to be detected with the data in the database to obtain the pickling time average value corresponding to the same oxidation degree and the same pickling solution concentration in the database; and adjusting the pickling time of the oxidation area by taking the pickling time average value as the adjustment value of the pickling time of each corresponding oxidation area.
The invention also discloses an intelligent control device for the stainless steel pickling process, which comprises the following components: the system comprises an acquisition module, a first image processing module, a second image processing module, a first parameter calculation module, a second parameter calculation module and an adjustment module, wherein the acquisition module selects an RGB camera, the RGB camera acquires a to-be-detected picture of the surface of the stainless steel material to be detected and a plurality of qualified pictures of the surface of the stainless steel material which is qualified by pickling, then the to-be-detected picture is processed by a semantic segmentation technology to obtain an image to be detected which only contains a steel material part, and a plurality of standard images which are qualified by pickling are processed by the same semantic segmentation technology to obtain a standard image which only contains the steel material part; the first image processing module is used for respectively carrying out difference on the gradient image of the image to be detected and the gradient image of each standard image to obtain a plurality of corresponding gradient difference images; the second image processing module is used for acquiring a first entropy value of a gradient co-occurrence matrix corresponding to an image to be detected and a second entropy value of a gradient co-occurrence matrix corresponding to each gradient difference image, calculating a difference value between the first entropy value and each second entropy value, acquiring all gradient difference images corresponding to the difference values larger than 0, and marking a standard image corresponding to each gradient difference image corresponding to the difference value larger than 0 as a target image; the first parameter calculation module is used for acquiring the average gray value of each target image and acquiring a reference gray value according to the average gray value of each target image; the second parameter calculation module is used for acquiring a gradient difference value of a region corresponding to each pixel point in the image to be detected and calculating the oxidation degree of a central pixel point corresponding to each region in the image to be detected according to the gradient difference value and a reference gray value; the adjusting module is used for clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas, recording the clustering areas as oxidation areas, and adjusting the pickling time of each oxidation area according to the oxidation degree and the pickling solution concentration corresponding to the oxidation areas.
In summary, the invention provides an intelligent control method and device for a stainless steel pickling process, wherein an image to be detected on the surface of a stainless steel material is acquired, a standard image which is similar to the image to be detected and qualified in pickling is obtained by processing the image to be detected, a reference gray value is determined by using the standard image and the image to be detected, the oxidation degree corresponding to each oxidation area of the image to be detected is determined according to the reference gray value and the gradient difference value of the image to be detected, and the pickling time of each oxidation area is adjusted according to the oxidation degree and the pickling solution concentration corresponding to each oxidation area and by combining the corresponding oxidation degree and the corresponding pickling solution concentration in historical data, so that the pickling time of different oxidation areas can be adaptively adjusted when the oxidation areas on the surface of the stainless steel are pickled, and the optimal pickling effect can be obtained at different positions with different oxidation degrees on the surface of the stainless steel.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. An intelligent control method for a stainless steel pickling process is characterized by comprising the following steps:
acquiring an image to be detected on the surface of the stainless steel and a plurality of standard images qualified in acid washing;
acquiring an image to be detected and a gradient image corresponding to each standard image, and obtaining a plurality of corresponding gradient difference images according to the gradient image of the image to be detected and the gradient image of each standard image;
acquiring a first entropy value of a gradient co-occurrence matrix of an image to be detected and a second entropy value of a gradient co-occurrence matrix of each gradient difference image, calculating a difference value between the first entropy value and each second entropy value, acquiring all gradient difference images corresponding to the difference values larger than 0, and marking a standard image corresponding to each gradient difference image corresponding to the difference value larger than 0 as a target image;
acquiring reference gray values according to all target images;
acquiring a gradient difference value of a region corresponding to each pixel point in the image to be detected, and calculating the oxidation degree of a central pixel point corresponding to each region in the image to be detected according to the gradient difference value and a reference gray value; the step of obtaining the gradient difference value of the corresponding area of each pixel point in the image to be detected comprises the following steps: acquiring a sliding window area image by taking each pixel point in the detection image as a central pixel point; obtaining a gradient difference value of a region corresponding to a central pixel point according to the gradient vector and the gradient value of each pixel point in each sliding window region image and the gradient vector and the gradient value of the pixel point corresponding to the central pixel point;
calculating the oxidation degree of each pixel point in the image to be detected according to the following formula (1):
wherein,
is the first in the image to be detected
The oxidation degree of each central pixel point;
corresponding to a pixel point with a pixel point i as a center pixel point
Gradient direction of each pixel point;
to be pixel points
First in the sliding window area image corresponding to the central pixel point
Gradient values of the individual pixel points;
to be pixel points
Center pixel point in sliding window area image corresponding to center pixel point
The gradient direction of (a);
to be a pixel point
Center pixel point in sliding window area image corresponding to center pixel point
A gradient value of (d);
for the first in the image to be detected
The gray value of each central pixel point;
is a reference gray value;
clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas, recording the clustering areas as oxidation areas, and adjusting the pickling time of each oxidation area according to the oxidation degree and the pickling solution concentration corresponding to each oxidation area and by combining the corresponding oxidation degree and the corresponding pickling solution concentration in the historical data.
2. The intelligent control method for the stainless steel pickling process as claimed in claim 1, wherein the step of obtaining a plurality of corresponding gradient difference images according to the gradient image of the image to be detected and the gradient image of each standard image comprises:
respectively obtaining a gradient image corresponding to an image to be detected and gradient values and gradient directions corresponding to pixel points in the gradient image corresponding to each standard image;
and subtracting the gradient value and the gradient direction corresponding to the image to be detected from the gradient value and the gradient direction corresponding to each standard image to obtain a plurality of gradient difference images.
3. The intelligent control method for the stainless steel pickling process according to claim 1, wherein the step of obtaining the reference gray value according to all the target images comprises:
acquiring a normalized gray level histogram of each target image;
determining the average gray value of the target image according to the gray levels in the gray histogram and the proportion of each gray level;
and taking the difference value between the corresponding entropy value of the image to be detected and the corresponding entropy value of each target image as weight, and carrying out weighted calculation on the average gray value of each target image to obtain a reference gray value.
4. The intelligent control method for the stainless steel pickling process according to claim 1, wherein the step of clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas and marking the clustering areas as oxidation areas comprises the following steps:
carrying out first clustering on the oxidation degree of each pixel point to obtain a plurality of primary clustering results, wherein each clustering result corresponds to one oxidation degree;
performing secondary clustering on the primary clustering result to obtain a secondary clustering result;
and taking the secondary clustering result as a minimum enclosure frame, wherein each minimum enclosure frame region corresponds to an oxidation region.
5. The intelligent control method for the stainless steel pickling process according to claim 1, wherein the step of adjusting the pickling time of each oxidation area according to the corresponding oxidation degree and pickling solution concentration of each oxidation area and the corresponding oxidation degree and pickling solution concentration in historical data comprises the following steps:
establishing a database according to the same oxidation degree, the same pickling solution concentration and the same oxidation degree of the stainless steel image qualified by pickling in the historical data and the time average value of all pickling times under the same pickling solution concentration;
matching the oxidation degree and the pickling solution concentration corresponding to the oxidation area of the image to be detected with the data in the database to obtain the pickling time average value corresponding to the same oxidation degree and the same pickling solution concentration in the database;
and taking the acid washing time average value as the adjustment value of the acid washing time of each corresponding oxidation area to adjust the acid washing time of the oxidation area.
6. An intelligent control device for a stainless steel pickling process, which is used in the intelligent control method for the stainless steel pickling process of any one of claims 1 to 5, and is characterized by comprising the following components:
the acquisition module is used for acquiring an image to be detected on the surface of the stainless steel and a plurality of standard images qualified in acid washing;
the first image processing module is used for respectively carrying out difference on the gradient image of the image to be detected and the gradient image of each standard image to obtain a plurality of corresponding gradient difference images;
the second image processing module is used for acquiring a first entropy value of a gradient co-occurrence matrix of an image to be detected and a second entropy value of a gradient co-occurrence matrix of each gradient difference image, calculating a difference value between the first entropy value and each second entropy value, acquiring all gradient difference images corresponding to the difference values larger than 0, and marking a standard image corresponding to each gradient difference image corresponding to the difference value larger than 0 as a target image;
the first parameter calculation module is used for acquiring the average gray value of each target image and acquiring a reference gray value according to the average gray value of each target image;
the second parameter calculation module is used for acquiring a gradient difference value of a region corresponding to each pixel point in the image to be detected and calculating the oxidation degree of a central pixel point corresponding to each region in the image to be detected according to the gradient difference value and a reference gray value; the step of obtaining the gradient difference value of the corresponding area of each pixel point in the image to be detected comprises the following steps: acquiring a sliding window area image by taking each pixel point in the detection image as a central pixel point; obtaining a gradient difference value of a region corresponding to a central pixel point according to the gradient vector and the gradient value of each pixel point in each sliding window region image and the gradient vector and the gradient value of the pixel point corresponding to the central pixel point;
calculating the oxidation degree of each pixel point in the image to be detected according to the following formula (1):
wherein,
for the first in the image to be detected
The degree of oxidation of each center pixel;
for pixel point correspondence with pixel point i as centerWithin the sliding window area image
Gradient direction of each pixel point;
to be pixel points
In the sliding window area image corresponding to the central pixel point
Gradient values of the individual pixel points;
to be a pixel point
Center pixel point in sliding window area image corresponding to center pixel point
The gradient direction of (a);
to be a pixel point
Center pixel point in sliding window area image corresponding to center pixel point
A gradient value of (d);
for the first in the image to be detected
The gray value of each central pixel point;
is a reference gray value;
and the adjusting module is used for clustering the oxidation degree of each pixel point in the image to be detected to obtain a plurality of clustering areas and marking the clustering areas as oxidation areas, and adjusting the pickling time of each oxidation area according to the oxidation degree and the pickling solution concentration corresponding to the oxidation areas.
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