CN118655304A - Leather cultural relic degradation degree rating method and system - Google Patents
Leather cultural relic degradation degree rating method and system Download PDFInfo
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- 239000010985 leather Substances 0.000 title claims abstract description 144
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 93
- 230000015556 catabolic process Effects 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 51
- PMMYEEVYMWASQN-DMTCNVIQSA-N Hydroxyproline Chemical compound O[C@H]1CN[C@H](C(O)=O)C1 PMMYEEVYMWASQN-DMTCNVIQSA-N 0.000 claims abstract description 45
- PMMYEEVYMWASQN-UHFFFAOYSA-N dl-hydroxyproline Natural products OC1C[NH2+]C(C([O-])=O)C1 PMMYEEVYMWASQN-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229960002591 hydroxyproline Drugs 0.000 claims abstract description 45
- FGMPLJWBKKVCDB-UHFFFAOYSA-N trans-L-hydroxy-proline Natural products ON1CCCC1C(O)=O FGMPLJWBKKVCDB-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 30
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000011156 evaluation Methods 0.000 claims description 6
- 230000006866 deterioration Effects 0.000 description 17
- 102000008186 Collagen Human genes 0.000 description 13
- 108010035532 Collagen Proteins 0.000 description 13
- 229920001436 collagen Polymers 0.000 description 13
- 239000000523 sample Substances 0.000 description 12
- 239000000835 fiber Substances 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
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- 238000004321 preservation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 230000032683 aging Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
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- 230000007774 longterm Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BGNGWHSBYQYVRX-UHFFFAOYSA-N 4-(dimethylamino)benzaldehyde Chemical compound CN(C)C1=CC=C(C=O)C=C1 BGNGWHSBYQYVRX-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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- 238000000643 oven drying Methods 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02P90/30—Computing systems specially adapted for manufacturing
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Abstract
The invention belongs to the technical field of leather cultural relic protection, and discloses a method and a system for grading degradation degree of leather cultural relics. The leather cultural relic degradation degree grading method comprises the following steps: acquiring an electronic image of a leather-made cultural relic; calculating and optimizing the layout of the acquisition points according to the image to obtain optimized acquisition points; detecting the moisture content of the leather cultural relics at the optimized collection points, and calculating a weighted average value of the moisture content; obtaining the hydroxyproline content in the leather cultural relics and the microscopic morphology of the leather cultural relics; and evaluating the degradation grade of the leather cultural relics according to the weighted average value of the moisture content, the hydroxyproline content and the microscopic morphology. In the process of detecting the moisture content of leather cultural relics, the detection acquisition points are optimized, the accuracy of moisture detection results is improved, and the degradation level is accurately estimated.
Description
Technical Field
The invention belongs to the technical field of leather cultural relic protection, and particularly relates to a method and a system for grading degradation degree of leather cultural relics.
Background
The history of using leather products by human beings is long, and leather cultural relics can reflect some cultural characteristics and social custom at the time, so that the leather cultural relics have great research value. After long-term preservation or burial of leather cultural relics, the structures of the leather cultural relics are often changed greatly, the internal moisture, collagen, grease and other substances are lost or denatured to different degrees, and deterioration phenomena such as dryness, hardness, mildew, curling and brittle fracture occur. The degradation state of the leather cultural relics is mastered in time, effective restoration and protection measures are adopted, and the method has important significance for long-term preservation of the leather cultural relics. However, the deterioration of leather cultural relics is evaluated from a sensory level, and a quantitative evaluation method for the deterioration degree of leather cultural relics is not yet available. Therefore, there is an urgent need to establish a scientific and accurate method for grading the degradation degree of leather cultural relics.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides a method and a system for grading the degradation degree of leather cultural relics.
In order to achieve the above object, the first scheme provided by the present invention is as follows:
a method for rating the degradation degree of leather cultural relics, comprising:
acquiring an electronic image of a leather-made cultural relic;
respectively calculating and optimizing the layout of the acquisition points according to the images to obtain optimized acquisition points;
Detecting the moisture content of the leather cultural relics at the optimized collection points, and calculating a weighted average value of the moisture content;
obtaining the hydroxyproline content in the leather cultural relics and the microscopic morphology of the leather cultural relics;
And evaluating the degradation grade of the leather cultural relics according to the weighted average value of the moisture content, the hydroxyproline content and the microscopic morphology.
Preferably, the method for calculating the acquisition point layout according to the image comprises the following steps:
Analyzing the image size to obtain an image contour;
calculating the maximum length and width according to the image contour and making a corresponding rectangle;
and setting a collection point from the rectangular central point at preset intervals until the whole leather cultural relic area is covered.
Preferably, the method for optimizing the layout of the acquisition points comprises the following steps: and identifying a detection area with high reliability according to the depth of field, the brightness or other related image parameters, and adjusting the layout of the acquisition points so that the acquisition points fall in the detection area with high reliability.
Preferably, the identification method of the detection area with high reliability comprises the following steps: and respectively collecting leather images of leather cultural relics corresponding to the focusing plane, the front depth of field boundary position and the rear depth of field boundary position of the camera, removing fuzzy areas on the three leather images, and merging the finally reserved clear areas.
Preferably, the weighted average calculation formula of the moisture content is: ; wherein x i is the moisture content of each acquisition point, n is the number of optimized acquisition points, and f i is a preset weight.
Preferably, the method for evaluating the degradation grade of the leather cultural relics according to the weighted average value of the moisture content, the hydroxyproline content and the micro morphology comprises the following steps:
respectively assigning values to the weighted average value of the moisture content, the hydroxyproline content and the microcosmic morphology according to preset standards to obtain a moisture content score, a hydroxyproline content score and a microcosmic morphology score;
Calculating the moisture content score, the hydroxyproline content score and the degradation score under the microcosmic morphology score according to a degradation score formula;
and the degradation grade corresponds to a preset degradation grade, and the degradation grade of the leather cultural relics is obtained.
Preferably, the degradation score formula is S i= 0.1633S1+0.5397S2+0.297S3, where S 1 is a microtopography score, S 2 is a moisture content score, and S 3 is a hydroxyproline content score.
The second technical scheme adopted by the invention is as follows:
A leather cultural relic degradation degree rating system comprising:
the first acquisition module is used for acquiring an electronic image of the leather-made cultural relics;
The calculation module is used for calculating and optimizing the layout of the acquisition points according to the image to obtain optimized acquisition points;
the detection and calculation module is used for detecting the moisture content of the optimized collection point of the leather cultural relics and calculating a weighted average value of the moisture content;
the second acquisition module is used for acquiring the hydroxyproline content in the leather-made cultural relics and the microscopic morphology of the leather-made cultural relics;
And the evaluation module is used for evaluating the degradation grade of the leather cultural relics according to the weighted average value of the moisture content, the hydroxyproline content and the microscopic morphology.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, the moisture content, the hydroxyproline content and the microscopic morphology of the leather cultural relics are used as indexes, a degradation grading formula is established by calculating weights among the three indexes, and the three indexes are respectively measured in the actual grading process, so that the accurate evaluation of the degradation grade of the leather cultural relics can be realized.
In the process of detecting the moisture content of leather cultural relics, the detection acquisition points are optimized, the accuracy of moisture detection results is improved, and the degradation level is accurately estimated.
Drawings
FIG. 1 shows the results of index detection of leather cultural relics with different degradation degrees;
Fig. 2 is a flow chart of a method for grading degradation degree of leather cultural relics according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an apparatus for capturing images of leather relics according to a preferred embodiment of the present invention;
Fig. 4 is a schematic diagram of the leather cultural relics according to a preferred embodiment of the present invention at the focusing plane, the front depth of field boundary position and the rear depth of field boundary position of the camera;
FIG. 5 is a diagram of simulated leather cultural relics to be tested with different degradation degrees according to an embodiment of the present invention;
FIG. 6 shows the water content (a) and hydroxyproline content (b) of a leather cultural relics simulation sample, and the degradation level interval division;
Fig. 7 is a schematic structural diagram of a leather cultural relic degradation degree rating system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The main components of the leather-made cultural relics are collagen and water, and the water is favorable for keeping the collagen fiber network structure of the leather-made cultural relics in a good state. Degradation can damage the collagen fiber network and simultaneously deteriorate the water retention capacity of the leather. With the continuous loss of moisture in the leather, the leather gradually becomes dry, hard and fragile. From this, it can be seen that the moisture content is closely related to the degree of deterioration of leather. Except for leather buried in extremely dry or saturated water environments, the moisture content of the finished leather is generally maintained at 12% -18%. When leather cultural relics are stored in a museum, the temperature and humidity of the collection are generally constant. Therefore, the water content of the leather cultural relics mainly depends on the water retention capacity of the leather cultural relics, and the leather cultural relics can be used as an important basis for judging the degradation degree of the leather cultural relics.
Although the moisture content of the leather cultural relics can reflect the degradation degree and the preservation state, the degradation degree of the leather is judged by only a single index, deviation is easy to occur due to the influence of accidental factors, and the accuracy of the final result is difficult to ensure. In order to make the degradation rating method have universality, accuracy and rationality, the degradation degree of leather cultural relics needs to be comprehensively judged by combining other indexes.
When the leather is deteriorated, the chemical composition, physical properties and the morphology of the collagen fiber network of the leather are changed. In order to establish a leather cultural relic degradation degree rating method, searching indexes closely related to degradation degrees, the applicant firstly takes archaized iron tanning leather as a raw material, adopts a composting rapid aging method to prepare a series of leather cultural relic simulation samples with different degradation degrees, and the numbers of the samples are 1-6 (figure 1). Among them, sample 1 was leather which had not been subjected to aging treatment, and the degree of deterioration of the sample was gradually increased from 1 to 6. The surface and section macroscopic morphology is observed by adopting a split microscope, the section microscopic morphology is observed by adopting a Scanning Electron Microscope (SEM), the sample morphology and porosity are detected by adopting a microscopic computer tomography system (micro CT), the moisture content is detected by adopting a skin moisture tester, the hydroxyproline content is detected by adopting a high performance liquid chromatography-fluorescence detection method, and the detection result is shown in figure 1.
As can be seen from the photograph taken by the stereoscopic microscope, as the degree of degradation of the sample increases, the color of the leather surface deepens and the roughness increases; the distinction between the grain surface layer and the reticular layer at the section is gradually blurred, and the adhesion degree of the collagen fiber is increased; the leather thickness is reduced. Although the macroscopic morphology of leather is significantly related to the degree of deterioration, it is difficult to obtain characteristic information for determining the degree of deterioration from the macroscopic morphology, and therefore it is not preferable as a key index for determining the degree of deterioration. The microscopic CT detection result shows that the porosity of the sample gradually decreases with the increase of the degradation degree, and the leather gradually becomes compact and adhered from loose and porous. However, the porosity of leather is easily affected by the tanning process (e.g., tanning process) and the initial value is often different and the variation value fluctuates greatly, so that the leather is not suitable as a quantization index for judging the degree of degradation.
From SEM photographs it can be seen that the collagen fibers of the unaged leather sample are structurally complete with a distinct "D period", i.e. periodic bright-dark cross-grains in the fibrils formed by a quarter-staggered arrangement of procollagens. As the degree of degradation increases, the collagen fiber bundles begin to break, and the fibril structure is destroyed, and the "D-cycle" definition decreases. That is, as the degree of deterioration increases, the structure of the collagen fibers is gradually destroyed. Therefore, the characteristic information of the leather can be obtained from the SEM photograph, thereby judging the degree of deterioration of the leather-made cultural relics.
In the degradation process of leather cultural relics, collagen is gradually lost and the water retention capacity is deteriorated. As can be seen from fig. 1, the moisture content and hydroxyproline content of leather have a negative correlation with the degree of deterioration. As previously mentioned, the moisture content of the collection of leather-made relics is substantially related only to their water retention capacity; hydroxyproline is a characteristic amino acid of collagen, and the proportion in collagen is basically stable. Thus, the moisture content and hydroxyproline content of the leather can be used to quantify the degree of deterioration of the leather.
Based on the above study, the first embodiment of the present invention provides a method for grading the degradation degree of leather-made cultural relics, and fig. 2 is a flow chart of the method for grading the degradation degree of leather-made cultural relics provided by the example of the present invention.
As shown in fig. 2, the method for grading the degradation degree of leather cultural relics specifically comprises the following steps:
S101, acquiring an electronic image of the leather cultural relic.
It can be appreciated that the leather relic can be scanned directly to obtain an electronic image which can reflect the basic outline, size, etc. of the leather relic, and the electronic image is used for subsequent confirmation of the collection point in the detection of the moisture content.
S102, calculating and optimizing the layout of the acquisition points according to the image to obtain the optimized acquisition points.
For the calculation of the acquisition point layout, it may include: analyzing the image size to obtain an image contour; calculating the maximum length and width according to the image contour and making a corresponding rectangle; and setting a collection point from the rectangular central point at preset intervals until the whole leather cultural relic area is covered.
It is understood that, for the preset distance, a person skilled in the art may select according to the size, shape, etc. of the leather-made relic.
Because leather articles are in a large shape, irregular areas such as bending, folding, concave, convex and the like may exist, and the areas are difficult to meet the basic requirement of the test, and the accuracy of the test results of the areas is doubtful, so that the areas need to be eliminated. The detection area with high reliability can be identified according to the depth of field, the darkness or other related image parameters of the image, the layout of the acquisition points is adjusted, and the acquisition points in the bending and folding, obvious concave or convex areas are removed, so that the acquisition points fall in the detection area with high reliability, and the optimization of the acquisition points is realized.
In some preferred embodiments, the method for identifying the detection area with high reliability includes: and respectively collecting leather images of leather cultural relics corresponding to the focusing plane, the front depth of field boundary position and the rear depth of field boundary position of the camera, removing fuzzy areas on the three leather images, and merging the finally reserved clear areas.
Specifically, as shown in fig. 3-4, fig. 3 is a preferred device for capturing images of leather cultural relics, which mainly comprises a camera 1 (preferably a camera with small depth of field) for capturing images, a movable platform 2 (hereinafter referred to as a stage) for placing the leather cultural relics, and a laser range finder 3. The acquisition method specifically comprises the following steps: acquiring an average height value between the laser range finder 3 and the objective table2 as a basic height value L 0; placing the leather-made relics 4 on the object stage 2, and scanning the leather-made relics 4 by using the laser range finder 3 to obtain the height value h of each area of the leather-made relics 4; carrying out statistical analysis on all the height values h, sorting the height values, finding out a data section with the smallest variance value, and calculating the average value of the height data of the section, namely the average height value a of the leveling area; calculating the depth L of field from the camera 1 to the plane 5 where the focusing center point is located; upward movement of the stage in the vertical direction by L 0 -a- "L/2" (FIG. 4 a), L 0 -a (FIG. 4 b), and L 0 -a+ "L/2" distances (FIG. 4 c), respectively, causes the flat areas with average height values to be located at the focal plane, front depth of field, and rear depth of field boundary positions of the camera, respectively; and acquiring leather images corresponding to the three positions, removing all fuzzy areas on the three images, merging the finally reserved clear areas to be used as a reliable area with higher flatness, namely a detection area with high reliability.
The depth of field is calculated as: wherein sigma is a radius of a circle of confusion, F is a focal length of the lens, F is an aperture value when the lens shoots, and L is a focusing distance.
S103, detecting the moisture content of the collection point of the leather cultural relics after optimization, and calculating a weighted average value of the moisture content.
For the detection of the moisture content of leather, the current common detection methods include oven drying, karl fischer and the like, but the methods have great destructiveness on samples during the test and are not suitable for precious leather cultural relics. In the process of realizing the invention, the applicant finds that the skin moisture tester can be used for carrying out nondestructive detection on the moisture content of leather cultural relics. By arranging the moisture detection probe on the surface of the leather cultural relics, the nondestructive detection of the moisture content of the leather cultural relics can be realized.
In order to reduce the impact of abnormal data on the moisture content results, a weighted average of the detected moisture content of the optimized acquisition points needs to be calculated.
Specifically, all the detected moisture content data are sorted according to the size to find the median m, the ratio a i（ai=xi/m of each data x i to the median m is calculated, and the weight f i of each data is determined according to the comparison table 1.
Table 1 moisture content data weight reference table
。
A weighted average of the leather moisture content is calculated and taken as the final value of the leather moisture content. The influence of the special area and the collected abnormal data on the average moisture content result is reduced, so that the obtained result is more accurate.
The formula for calculating the weighted average of the moisture content of the leather is as follows:。
s105, obtaining the hydroxyproline content in the leather cultural relics and the microscopic morphology of the leather cultural relics.
It is understood that SEM may be used to obtain and observe the microscopic morphology of leather relics.
For the measurement of the hydroxyproline content in leather cultural relics, the measurement can be carried out by using a method for detecting the hydroxyproline content in leather in the prior art, such as a high performance liquid chromatography-fluorescence detection method, a p-dimethylaminobenzaldehyde color development method and the like.
And S106, evaluating the degradation grade of the leather cultural relics according to the weighted average value of the moisture content, the hydroxyproline content and the micro morphology.
The method specifically comprises the following steps:
and S106-1, respectively assigning values to the weighted average value of the moisture content, the hydroxyproline content and the microcosmic morphology according to preset standards to obtain a moisture content score, a hydroxyproline content score and a microcosmic morphology score.
In a specific embodiment, the method for assigning values according to the preset standard comprises the following steps:
For the assignment of the moisture content and the hydroxyproline content, the leather deterioration grades are to be classified into four grades of 0, I, II and III, wherein the grade 0 is the leather without deterioration phenomenon, and the deterioration degree increases from the grade 0 to the grade III. In order to determine the range of the hydroxyproline content and the water content corresponding to each degradation grade, a large number of simulation samples are required to be analyzed and tested. As shown in fig. 5, four kinds of leather cultural relics with different degradation degrees are selected, each kind of leather cultural relics has four degradation degrees, 16 samples are obtained, hydroxyproline and water content of each sample are measured respectively, and experimental results are shown in fig. 6. The value range of each degradation section is determined from the value characteristics of the sample, and the corresponding score is assigned to each degradation level, as shown in table 2.
TABLE 2 values for the degradation level intervals and assignments for the moisture content and hydroxyproline content
。
For assignment of microscopic morphology, the leather collagen fiber without degradation phenomenon has a complete structure and a D period structure with staggered brightness; as the degree of degradation increases, the fibers break, and the "D cycle" clarity decreases. The degree of leather deterioration can be judged accordingly, and specific grading, description and example pictures are shown in table 3.
Table 3 micro-morphology degradation grading and description
。
It should be noted that the specific size, the corresponding specific grade, the moisture content, the hydroxyproline content, and the description of the microscopic morphology in the above assignment process are all exemplary, and are not limited in particular, and can be adjusted by those skilled in the art according to practical situations.
S106-2, calculating the moisture content score, the hydroxyproline content score and the degradation score under the microcosmic morphology score according to a degradation score formula.
In the embodiment of the invention, a degradation scoring formula is independently constructed by the applicant, and the specific method comprises the following steps of:
When the moisture content, the hydroxyproline content and the microscopic morphology are used as the degradation indexes of leather cultural relics, the weight of each index is required to be determined in the final decision, and the weight of each index is calculated by adopting a hierarchical analysis method: target layer Z: determining the degradation degree of leather cultural relics; criterion layer a: microcosmic morphology (a 1), moisture content (a 2), hydroxyproline content (a 3).
(1) The judgment matrix A is constructed, indexes are compared pairwise to obtain relative importance a ij,aij which represents the importance degree of the i index compared with the j index, the value range of a ij is 1-9, and the definition is referred to in Table 4. If the difference between the indexes is judged to be between the two degrees, the value of a ij can be 2,4,6 and 8. And a ij·aji=1,aii =1.
Table 4 a ij values and corresponding descriptions
。
(2) The constructed judgment matrix A is shown in Table 5, the eigenvector w and the maximum eigenvector lambda max of the matrix A are calculated, consistency detection is carried out, and the weight of each index is determined.
TABLE 5 determination matrix A
。
Maximum characteristic value lambda max = 3.00875.
(3) Consistency detection of matrix a
The consistency index CI is calculated according to the following formula,
；
Ci= 0.004375 was calculated. When n=3 is obtained by table lookup, the average random uniformity index ri=0.52,
The consistency ratio CR is calculated according to the following formula, and consistency detection is performed,
；
Since cr=0.0084 < 0.1, the consistency of the matrix is considered acceptable.
(4) Determination of index weights
The eigenvector w= (0.081,0.731,0.188) T of the matrix, the corresponding value is the weight of each index. I.e. microtopography weight n 1 =0.1633, moisture content weight n 2 = 0.5397, hydroxyproline content weight n 3 =0.297.
Therefore, the degradation score formula of the embodiment of the present invention is: s i= 0.1633S1+0.5397S2+0.297S3, wherein S 1 is a micro morphology score, S 2 is a moisture content score, and S 3 is a hydroxyproline content score.
Substituting the detected moisture content score, hydroxyproline content score and microcosmic morphology score into a degradation scoring formula to obtain a degradation score.
And S106-3, the degradation grade corresponds to a preset degradation grade, and the degradation grade of the leather cultural relics is obtained.
The corresponding grade ranges of each degradation grade of the leather cultural relics in the embodiment of the invention are shown in table 6, and the final degradation grade S i is compared with table 6 to obtain the degradation grade.
TABLE 6 leather degradation grade grading and scoring Range
。
By the above method, the applicant rated the degree of deterioration of the leather-made relic simulation sample prepared by oneself, and the results are shown in table 7.
Table 7 results of evaluation of degradation of leather cultural relics simulated sample and final degradation grade
。
In a second aspect of the present application, a degradation degree rating system for leather cultural relics is provided, and fig. 7 is a schematic structural diagram of a degradation degree rating system for leather cultural relics provided by an embodiment of the present application.
The leather cultural relic degradation degree rating system 700 comprises a first acquisition module 701, a calculation module 702, a detection calculation module 703, a second acquisition module 704 and an evaluation module 705. The method comprises the following steps:
a first obtaining module 701, configured to obtain an electronic image of a leather-made cultural relic;
The calculation module 702 is configured to calculate and optimize a layout of the collection points according to the image, so as to obtain optimized collection points;
The detection and calculation module 703 is used for detecting the moisture content of the collection point of the leather cultural relics after optimization, and calculating a weighted average value of the moisture content;
A second obtaining module 704, configured to obtain a hydroxyproline content in the leather cultural relics and a microscopic morphology of the leather cultural relics;
An evaluation module 705 for evaluating the degradation grade of the leather relics based on the weighted average of the moisture content, the hydroxyproline content and the micro morphology.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. The method for grading the degradation degree of leather cultural relics is characterized by comprising the following steps:
acquiring an electronic image of a leather-made cultural relic;
Calculating and optimizing the layout of the acquisition points according to the image to obtain optimized acquisition points;
Detecting the moisture content of the leather cultural relics at the optimized collection points, and calculating a weighted average value of the moisture content;
obtaining the hydroxyproline content in the leather cultural relics and the microscopic morphology of the leather cultural relics;
And evaluating the degradation grade of the leather cultural relics according to the weighted average value of the moisture content, the hydroxyproline content and the microscopic morphology.
2. The method for grading the degradation degree of leather cultural relics according to claim 1, wherein the method for calculating the layout of the collection points according to the image is as follows:
Analyzing the image size to obtain an image contour;
calculating the maximum length and width according to the image contour and making a corresponding rectangle;
and setting a collection point from the rectangular central point at preset intervals until the whole leather cultural relic area is covered.
3. The method for grading the degradation degree of leather cultural relics according to claim 1, wherein the method for optimizing the layout of the collection points is as follows: and identifying a detection area with high reliability according to the depth of field, the darkness or other related image parameters, and adjusting the layout of the acquisition points so that the acquisition points fall in the detection area with high reliability.
4. The method for grading the degradation degree of leather cultural relics according to claim 3, wherein the identification method of the detection area with high credibility is as follows: and respectively collecting leather images of leather cultural relics corresponding to the focusing plane, the front depth of field boundary position and the rear depth of field boundary position of the camera, removing fuzzy areas on the three leather images, and merging the finally reserved clear areas.
5. The method for grading the degradation degree of leather cultural relics according to claim 1, wherein the weighted average calculation formula of the moisture content is: ; wherein x i is the moisture content of each acquisition point, n is the number of optimized acquisition points, and f i is a preset weight.
6. The method for rating the degradation degree of leather cultural relics according to claim 1, wherein the method for evaluating the degradation degree of leather cultural relics according to the weighted average of the moisture content, the hydroxyproline content and the micro morphology comprises:
respectively assigning values to the weighted average value of the moisture content, the hydroxyproline content and the microcosmic morphology according to preset standards to obtain a moisture content score, a hydroxyproline content score and a microcosmic morphology score;
Calculating the moisture content score, the hydroxyproline content score and the degradation score under the microcosmic morphology score according to a degradation score formula;
and the degradation grade corresponds to a preset degradation grade, and the degradation grade of the leather cultural relics is obtained.
7. The method of claim 6, wherein the degradation score formula is S i= 0.1633S1+0.5397S2+0.297S3, wherein S 1 is a microtopography score, S 2 is a moisture content score, and S 3 is a hydroxyproline content score.
8. The leather cultural relic degradation degree rating system is characterized by comprising:
the first acquisition module is used for acquiring an electronic image of the leather-made cultural relics;
The calculation module is used for calculating and optimizing the layout of the acquisition points according to the image to obtain optimized acquisition points;
the detection and calculation module is used for detecting the moisture content of the optimized collection point of the leather cultural relics and calculating a weighted average value of the moisture content;
the second acquisition module is used for acquiring the hydroxyproline content in the leather-made cultural relics and the microscopic morphology of the leather-made cultural relics;
And the evaluation module is used for evaluating the degradation grade of the leather cultural relics according to the weighted average value of the moisture content, the hydroxyproline content and the microscopic morphology.
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