A method and system for detecting the embossing clarity of PVC leather

Abstract

The present invention relates to the technical field of image processing, and particularly relates to a method and system for detecting the embossing clarity of PVC leather materials, including: obtaining the embossing area of the PVC leather material at different detection times; analyzing the rebound recovery of the leather indentation in the embossing area of the PVC leather material at consecutive detection times to obtain the embossing durability of the PVC leather material; analyzing the compression strength of different cortical layers inside the leather in the embossing area of the PVC leather material at consecutive detection times to obtain the internal cortical compression degree of the PVC; according to the internal cortical compression degree of the PVC and the embossing durability of the PVC leather material, comprehensively analyzing the influence of the internal cortical layer on maintaining the embossing shape to obtain the PVC compression influence degree; performing adaptive clarity detection according to the PVC compression influence degree. The present invention reduces the interference caused by the embossing illusion generated in the inner layer of the leather material and improves the embossing clarity of the PVC leather material.

Description

Technical Field

[0001] The present invention relates to the technical field of image processing, and specifically relates to a method and system for detecting the embossing clarity of PVC leather. Background Art

[0002] PVC (polyvinyl chloride) is a widely used thermoplastic plastic, which is polymerized from vinyl chloride monomers. It has various properties, such as weather resistance, chemical resistance, corrosion resistance and impact resistance, and at the same time has wear resistance and insulation, and is lightweight and flame retardant; in order to attract consumers to consume, a semi-finished PVC leather is usually pressed by an embossing machine to form different concave and convex planes on the surface of the PVC leather, so as to form embossing on the PVC leather. In order to ensure the embossing quality of the PVC leather, it is necessary to detect the clarity of the embossing of the PVC leather.

[0003] There are various leather inner layers with different structures in the PVC leather. The elasticity and distribution density between different leather inner layers are different. When the embossing machine applies pressure to the PVC leather during embossing, it may cause large deformation extrusion of the inner layer leather under some leather, forming a false appearance after embossing on the surface of the PVC leather, thus interfering with the representation effect of the embossing clarity of the PVC leather. Summary of the Invention

[0004] The present invention provides a method and system for detecting the embossing clarity of PVC leather to solve the existing problems: there are various leather inner layers with different structures in the PVC leather, the elasticity and distribution density between different leather inner layers are different, and when the embossing machine applies pressure to the PVC leather during embossing, it may cause large deformation extrusion of the inner layer leather under some leather, forming a false appearance after embossing on the surface of the PVC leather.

[0005] The method and system for detecting the embossing clarity of PVC leather of the present invention adopt the following technical solutions:

[0006] The present invention proposes a method for detecting the embossing clarity of PVC leather, and the method includes the following steps:

[0007] Obtain a plurality of embossing areas of PVC leather at different detection times; each embossing area of the PVC leather corresponds to a PVC leather thickness data and a PVC leather hardness data at each detection time;

[0008] According to the PVC leather thickness data, analyze the rebound recovery of the leather indentation in the same embossing area of the PVC leather at consecutive detection times, and obtain the embossing durability of the embossing area of the PVC leather;

[0009] According to the hardness data of the PVC leather, analyze the compression strength of different inner layers of the leather within the embossed area of the same PVC leather at consecutive detection times, and obtain the compression degree of the inner layer of PVC within the embossed area of the PVC leather; according to the compression degree of the inner layer of PVC and the embossing durability of the PVC leather, comprehensively analyze the influence of the inner layer of the embossed area of the same PVC leather on maintaining the embossed shape, and obtain the PVC compression influence degree of the embossed area of the PVC leather.

[0010] According to the PVC compression influence degree, perform an adaptive clarity detection on the embossing of the PVC leather.

[0011] Preferably, the method for obtaining the embossing durability of the PVC leather is as follows:

[0012] For any embossed area of the PVC leather, analyze the disappearance situation of the embossed edge within the embossed area of the PVC leather in the overall time sequence, and obtain the embossed edge disappearance rate of the embossed area of the PVC leather; according to the thickness data of the PVC leather and the embossed edge disappearance rate, analyze the change maintenance situation between the edge change of the embossed edge within the embossed area of the PVC leather and the leather thickness in the overall time sequence, and obtain the embossing durability of the PVC leather in the embossed area of the PVC leather.

[0013] Preferably, the method for obtaining the embossed edge disappearance rate is as follows:

[0014] Obtain the edge disappearance amount of the embossed area of the PVC leather at adjacent detection times; analyze the disappearance distribution characteristics of the embossed edge within the embossed area of the PVC leather in the overall time sequence, and obtain the embossed edge disappearance uniformity of the embossed area of the PVC leather; according to the edge disappearance amount and the embossed edge disappearance uniformity, obtain the embossed edge disappearance rate of the embossed area of the PVC leather.

[0015] Preferably, after calculating the embossing durability of the PVC leather, it further includes:

[0016] Perform a normalization process on the embossing durability of the PVC leather.

[0017] Preferably, the method for obtaining the compression degree of the inner layer of PVC is as follows:

[0018] For any embossed area of the PVC leather, according to the hardness data of the PVC leather, analyze the reduction situation of the leather hardness within the embossed area of the PVC leather in the overall time sequence, and obtain the compression strength of the inner layer of PVC in the embossed area of the PVC leather; according to the compression strength of the inner layer of PVC, obtain the compression degree of the inner layer of PVC in the embossed area of the PVC leather.

[0019] Preferably, the method for obtaining the compression strength of the inner layer of PVC is as follows:

[0020] Obtain several leather hardness reduction periods in the embossing area of the PVC leather; analyze the change rate of the leather hardness within adjacent leather hardness reduction periods to obtain the compression strength of the inner layer of PVC in the embossing area of the PVC leather.

[0021] Preferably, the method for obtaining the PVC compression influence degree is as follows:

[0022] For any embossing area of the PVC leather, analyze the reverse synchronous relationship between the embossing edge and the compression hardness change of the inner cortex of the PVC in the embossing area of the PVC leather to obtain the reverse synchronization degree of the inner cortex of the embossing area of the PVC leather; based on the compression degree of the inner cortex of the PVC, the embossing durability of the PVC leather, and the reverse synchronization degree of the inner cortex of the embossing area, obtain the PVC compression influence degree of the embossing area of the PVC leather.

[0023] Preferably, the method for obtaining the reverse synchronization degree of the inner cortex of the embossing area is as follows:

[0024] Analyze the correlation between the maintenance duration of the embossing edge and the recovery duration of the inner cortex from the compressed state to the expanded state in the embossing area of the PVC leather to obtain the reverse synchronization degree of the inner cortex of the embossing area of the PVC leather.

[0025] Preferably, after calculating the PVC compression influence degree, it further includes:

[0026] Perform normalization processing on the PVC compression influence degree.

[0027] The present invention also proposes an embossing clarity detection system for PVC leather, including a memory and a processor, and the processor executes the computer program stored in the memory to implement the steps of the above-mentioned embossing clarity detection method for PVC leather.

[0028] The beneficial effects of the technical solution of the present invention are as follows: By analyzing the rebound recovery of the leather indentation in the embossing area of the same PVC leather at consecutive detection times, the embossing durability of the PVC leather in the embossing area is obtained; the embossing durability of the PVC leather is used to describe the situation where the embossing marks are continuously obvious, and more intuitively reflects the printing and fixing effect of the surface treatment agent in the embossing area of the PVC leather; then analyze the compression strength of different leather layers inside the leather in the embossing area of the same PVC leather at consecutive detection times to obtain the internal leather layer compression degree of the PVC leather in the embossing area; the internal leather layer compression degree of the PVC is used to describe the pressing depth of the embossing texture of the PVC leather, making the squeezability of the inner layer of the PVC leather more obvious; finally, according to the internal leather layer compression degree of the PVC and the embossing durability of the PVC leather, comprehensively analyze the influence of the internal leather layer in the embossing area of the same PVC leather on maintaining the embossing shape, and obtain the PVC compression influence degree of the embossing area of the PVC leather; the PVC compression influence degree is used to describe the correlation between the embossing marks and the compression of the inner layer of the leather in the embossing area of the PVC leather, making the interference of the inner leather layer of the PVC leather on the embossing indentation more specific; the present invention analyzes the time fluctuation relationship between the compression of different leather layers inside the PVC leather and the persistence of the surface embossing marks to obtain the PVC compression influence degree, and performs adaptive clarity detection on the embossing of the PVC leather; reduces the interference caused by the embossing illusion generated by the inner layer of the leather, and improves the clarity of the embossing of the PVC leather. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a flowchart of the steps of a method for detecting the embossing clarity of a PVC leather of the present invention;

[0031] Figure 2 It is a schematic diagram of the internal leather layer of the PVC leather of the present invention;

[0032] Figure 3 It is a schematic diagram of the embossing extrusion of the water-based treatment layer and the PVC foam layer of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following specifically describes, in conjunction with the accompanying drawings and preferred embodiments, a method and system for detecting the embossing clarity of a PVC leather material proposed according to the present invention, including its specific implementation manner, structure, features, and effects. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs.

[0035] The following specifically describes the specific solution of a method and system for detecting the embossing clarity of a PVC leather material provided by the present invention in conjunction with the accompanying drawings.

[0036] Please refer to Figure 1 , which shows a step flow chart of a method for detecting the embossing clarity of a PVC leather material provided by an embodiment of the present invention. The method includes the following steps:

[0037] Step S001: Obtain a plurality of embossing regions of the PVC leather material at different detection times; each embossing region of the PVC leather material corresponds to a PVC leather material thickness data and a PVC leather material hardness data at each detection time.

[0038] It should be noted that there are multiple leather material inner layers with different structures in the PVC leather material. The elasticity and distribution density between different leather material inner layers are different. When the embossing machine applies pressure to the PVC leather material during embossing, it may cause relatively large deformation extrusion of the inner layer leather material under some leather materials, forming an illusion after embossing on the surface of the PVC leather material, thereby interfering with the representation effect of the embossing clarity of the PVC leather material.

[0039] In a specific implementation manner of the embodiment of the present invention, the method for obtaining the embossed area of the PVC leather: Use an industrial camera to horizontally capture images of the PVC leather at several detection times; Take the PVC leather image at any one detection time as an example, and perform grayscale processing on the PVC grayscale image to obtain a PVC leather grayscale image; Input the PVC leather grayscale image into the trained neural network to obtain several embossed areas of the PVC leather in the PVC leather grayscale image. The neural network used in this embodiment is YOLOv3, and the method for obtaining the dataset for training this neural network is: Collect a large number of PVC leather grayscale images, and manually mark the embossed areas of the PVC leather with bounding boxes in each PVC leather grayscale image. This marking result is recorded as the label of each PVC leather grayscale image; Collect a large number of PVC leather grayscale images and their corresponding labels to form a dataset; Use this dataset to train the neural network, and the loss function used during the training process is the mean square error loss function; The specific training process is well-known content of the neural network, and the specific training process will not be elaborated in this embodiment.

[0040] It should be specifically noted that this embodiment takes one second as a detection time for illustration, so as to collect PVC leather grayscale images. Each embossed area of the PVC leather contains an embossed pattern of the PVC leather. The setting of the detection time and the embossed pattern of the PVC leather can be determined according to specific implementation situations, and will not be elaborated in this embodiment; In addition, grayscale processing is a well-known technology and will not be elaborated in this embodiment.

[0041] It should be noted that the embossed areas of the PVC leather in the PVC leather grayscale images obtained at different detection times are the same in terms of quantity and position, only the grayscale values of the pixel points inside the areas may change.

[0042] Furthermore, use a hardness tester and a thickness gauge to detect the embossed area of the PVC leather respectively, and obtain the PVC leather thickness data and the PVC leather hardness data.

[0043] So far, several embossed areas of the PVC leather at different detection times are obtained through the above method.

[0044] Step S002: Analyze the rebound recovery of the leather indentation in the same embossed area of the PVC leather at consecutive detection times according to the PVC leather thickness data, and obtain the embossing durability of the embossed area of the PVC leather.

[0045] It should be noted that before the PVC leather is embossed by an embossing machine, a surface treatment agent containing an aqueous treatment agent needs to be printed on the semi-finished PVC leather. Through the process of drying first and then cooling, the surface treatment agent is stably retained on the semi-finished PVC leather, so that the embossing effect of the subsequent embossing machine on the semi-finished PVC leather is more durable; and the surface treatment agent printed on the semi-finished PVC leather itself also has a certain viscosity, covering the surface of the semi-finished PVC leather will change the tension situation when it is pressed, and thus the rebound situation of the semi-finished PVC leather; Therefore, according to the PVC leather thickness data, the rebound recovery of the leather indentation in the embossed area of the same PVC leather at consecutive detection times can be analyzed to obtain the embossing durability of the embossed area of the PVC leather. Among them, the greater the embossing durability of the PVC leather, the more obvious the embossing marks in the embossed area of the PVC leather are maintained continuously, reflecting that the printing and fixing effect of the surface treatment agent in the embossed area of the PVC leather is better, and the worse the rebound effect of the PVC leather in the embossed area of the PVC leather.

[0046] Preferably, in some implementation manners of the embodiments of the present invention, the method for obtaining the embossing durability of the PVC leather is as follows: for any embossed area of the PVC leather, analyze the disappearance of the embossing edge in the overall time sequence in the embossed area of the PVC leather to obtain the embossing edge disappearance rate of the embossed area of the PVC leather; according to the PVC leather thickness data and the embossing edge disappearance rate, analyze the change maintenance between the edge change of the embossing edge in the overall time sequence in the embossed area of the PVC leather and the leather thickness to obtain the embossing durability of the embossed area of the PVC leather. The specific process is as follows:

[0047] It should be noted that if the semi-finished PVC leather has a relatively obvious rebound after embossing, then the embossing shape formed by pressing to show a concave-convex surface will have a reduced expressiveness of the corresponding embossing shape due to the reduction of the height difference of the concave-convex surface, making the embossing edge more difficult to observe; therefore, the disappearance of the embossing edge in the embossed area of the PVC leather in the overall time sequence can be analyzed to obtain the embossing edge disappearance rate of the embossed area of the PVC leather; among them, the greater the embossing edge disappearance rate, the more obvious the rebound of the PVC leather in the embossed area of the PVC leather, reflecting the worse the embossing effect of the PVC leather in the embossed area of the PVC leather.

[0048] Preferably, in some implementation manners of the embodiments of the present invention, the method for obtaining the embossing edge disappearance rate is as follows: obtain the edge disappearance amount of the embossed area of the PVC leather at adjacent detection times; analyze the disappearance distribution characteristics of the embossing edge in the overall time sequence of the embossed area of the PVC leather to obtain the embossing edge disappearance uniformity of the embossed area of the PVC leather; according to the edge disappearance amount and the embossing edge disappearance uniformity, obtain the embossing edge disappearance rate of the embossed area of the PVC leather. The specific process is as follows:

[0049] Taking any embossed area of PVC leather as an example, a number of edge pixel points of the embossed area of the PVC leather at each detection moment are obtained through the Canny edge algorithm; taking any two adjacent detection moments as an example, the reduction amount of the edge pixel points of the embossed area of the PVC leather between these two detection moments is used as the edge disappearance amount. Each embossed area of PVC leather corresponds to multiple edge disappearance amounts, and each edge disappearance amount corresponds to two detection moments. In addition, the process of obtaining edge pixel points is well-known content of the Canny edge algorithm, which will not be elaborated in this embodiment.

[0050] Furthermore, the average value of all edge disappearance amounts of the embossed area of the PVC leather is used as the embossing edge disappearance uniformity of the embossed area of the PVC leather. As an example, the embossing edge disappearance rate can be calculated by the following formula:

[0051]

[0052] In the formula, represents the embossing edge disappearance rate of the th embossed area of PVC leather; represents the cumulative sum of all edge disappearance amounts of the th embossed area of PVC leather; represents the embossing edge disappearance uniformity of the th embossed area of PVC leather.

[0053] It should be noted that the larger the embossing edge disappearance rate, the more obvious the rebound of the PVC leather in the embossed area of the PVC leather, indicating that the embossing effect of the PVC leather in the embossed area of the PVC leather is worse.

[0054] Furthermore, taking any edge pixel point of the embossed area of the PVC leather at any detection moment as an example, the minimum distance between this edge pixel point and other edge pixel points is used as the pixel edge interval distance of this edge pixel point; the variance of the pixel edge interval distances of all edge pixel points of the embossed area of the PVC leather at this detection moment is used as the embossing edge continuity integrity of the embossed area of the PVC leather at this detection moment. As an example, the PVC leather embossing durability can be calculated by the following formula:

[0055]

[0056] In the formula, represents the embossing durability of the th embossed area of PVC leather; represents the embossing edge disappearance rate of the th embossed area of PVC leather; Represents the total number of detection times; Represents the PVC leather thickness data of the th PVC leather embossing area; Represents the embossing edge continuity integrity of the th PVC leather embossing area at the th detection time; embossing edge continuity integrity of the th PVC leather embossing area at the th detection time; Represents the exponential function with the natural constant as the base. In the embodiment,

[0057] is used to present the inverse proportional relationship and normalization processing.

[0058] is the input of the model, and the implementer can select the inverse proportional function and normalization function according to the actual situation. It should be noted that if the embossing durability of the PVC leather is greater, it means that the embossing marks in the PVC leather embossing area remain continuous and obvious, reflecting that the printing and fixing effect of the surface treatment agent in the PVC leather embossing area is better, and the rebound effect of the PVC leather in the PVC leather embossing area is worse.

[0059] So far, the embossing durability of the PVC leather in the PVC leather embossing area is obtained through the above method.

[0060] Step S003: According to the PVC leather hardness data, analyze the compression strength of different inner layers of the leather in the same PVC leather embossing area at continuous detection times to obtain the inner layer compression degree of the PVC in the PVC leather embossing area; according to the inner layer compression degree of the PVC and the embossing durability of the PVC leather, comprehensively analyze the influence of the inner layer of the same PVC leather embossing area on maintaining the embossing shape to obtain the PVC compression influence degree of the PVC leather embossing area.

[0061] It should be noted that, usually, in order to ensure the quality of the final produced PVC leather, the semi-finished PVC leather during production is coated with multiple layers of treatment slurry to form PVC leather inner layers with significantly different multi-layer physical structures. For example: water-based treatment layer, PVC dense layer, PVC foam layer, PVC adhesive layer, and fabric layer. The voids between the materials of these PVC leather inner layers are different, and the corresponding compressible degrees are different. Therefore, based on the PVC leather hardness data, the compression strength of different leather layers inside the leather in the embossed area of the same PVC leather at consecutive detection times can be analyzed to obtain the PVC inner layer compression degree in the embossed area of the PVC leather. Among them, the greater the PVC inner layer compression degree, the easier it is for the corresponding leather inner layer under the embossed area of the PVC leather to undergo compression deformation during the embossing process, indicating that the embossed texture in the embossed area of the PVC leather is deeper. Please refer to Figure 2 , which shows a schematic diagram of the inner cortex of PVC leather, where the water-based treatment layer, PVC dense layer, PVC foam layer, PVC adhesive layer, and fabric layer are arranged in sequence from top to bottom.

[0062] Furthermore, it should be noted that to a certain extent, the PVC inner layer compression degree reflects the degree of compression of the corresponding leather inner layer under the embossed area of the PVC leather after embossing; the embossing durability of the PVC leather reflects to a certain extent the degree to which the embossing marks can be clearly observed in the embossed area of the PVC leather; the two jointly reflect to a certain extent the clarity of the inner cortex of the embossed area of the PVC leather regarding the embossing marks. Therefore, based on the PVC inner layer compression degree and the embossing durability of the PVC leather, the influence of the inner cortex of the embossed area of the same PVC leather on maintaining the embossed shape can be comprehensively analyzed to obtain the PVC compression influence degree in the embossed area of the PVC leather. Among them, the greater the PVC compression influence degree, the greater the correlation between the embossing marks in the embossed area of the PVC leather and the compression of the leather inner layer, indicating that the embossing marks in the embossed area of the PVC leather are more likely to be formed by the inner leather inner layer rather than by the deformation of the surface leather itself.

[0063] Preferably, in some implementation manners of the embodiments of the present invention, the method for obtaining the inner layer compression degree is as follows: For any embossed area of the PVC leather, based on the PVC leather hardness data, analyze the reduction of the leather hardness in the embossed area of the PVC leather in the overall time sequence to obtain the compression strength of the PVC inner layer in the embossed area of the PVC leather; based on the compression strength of the PVC inner layer, obtain the PVC inner layer compression in the embossed area of the PVC leather. The specific process is as follows:

[0064] It should be noted that after the semi-finished PVC leather material is embossed by an embossing machine, the compressed area has its internal air gap reduced due to the air being discharged, resulting in an overall increase in hardness. Also, since the response speed of different inner layers of the leather material to hardness changes is affected by their physical structures, the softening situation of the leather material hardness in the embossed area of the PVC leather material over the overall time sequence can be analyzed based on the PVC leather material hardness data, and the compressive strength of the inner PVC layer in the embossed area of the PVC leather material can be obtained. Among them, the greater the compressive strength of the inner PVC layer, the more obvious the hardness change in the embossed area of the PVC leather material, indicating that the inner cortex in the embossed area of the PVC leather material is more likely to undergo extrusion changes.

[0065] Preferably, in some implementation manners of the embodiments of the present invention, the method for obtaining the compressive strength of the inner PVC layer is as follows: Obtain several leather material hardness softening time periods in the embossed area of the PVC leather material; Analyze the speed of change of the leather material hardness between adjacent leather material hardness softening time periods to obtain the compressive strength of the inner PVC layer in the embossed area of the PVC leather material. The specific process is as follows:

[0066] Taking any two adjacent detection times as an example, among these two detection times, if the PVC leather material hardness data at the second detection time in the embossed area of the PVC leather material is greater than the PVC leather material hardness data at the first detection time, then the second detection time is taken as the leather material hardness softening time of the embossed area of the PVC leather material. Obtain all the leather material hardness softening times in the embossed area of the PVC leather material; The time period formed by consecutive leather material hardness softening times is used as the leather material hardness softening time period. Each embossed area of the PVC leather material corresponds to multiple leather material hardness softening times.

[0067] It should be especially noted that the leather material hardness softening time period only contains the leather material hardness softening times and does not contain other detection times.

[0068] Furthermore, the average value of the number of detection times between all adjacent leather material hardness softening time periods is used as the compressive strength of the inner PVC layer in the embossed area of the PVC leather material.

[0069] It should be noted that among them, the greater the compressive strength of the inner PVC layer, the more obvious the hardness change in the embossed area of the PVC leather material, indicating that the inner cortex in the embossed area of the PVC leather material is more likely to undergo extrusion changes.

[0070] Furthermore, the absolute value of the difference in the PVC leather material hardness data between the first leather material hardness softening time and the last leather material hardness softening time in each leather material hardness softening time period is used as the PVC leather material hardness softening amount of each leather material hardness softening time period; As an example, the compression degree of the inner PVC cortex can be calculated by the following formula:

[0071]

[0072] In the formula, represents the compression degree of the inner PVC layer of the th PVC leather embossing area; represents the pressure resistance of the inner PVC layer of the th PVC leather embossing area; represents the total number of leather hardness reduction periods in the th PVC leather embossing area; represents the leather softening amount in the th leather hardness reduction period in the th PVC leather embossing area.

[0073] It should be noted that if the compression degree of the inner PVC layer is larger, it indicates that the corresponding inner layer of the leather in the PVC leather embossing area is more likely to undergo compression deformation with the embossing process, reflecting that the embossing texture in the PVC leather embossing area is deeper.

[0074] Preferably, in some implementation manners of the embodiments of the present invention, the method for obtaining the PVC compression influence degree is as follows: for any PVC leather embossing area, analyze the reverse synchronous relationship between the embossing edge and the change in the compression hardness of the inner PVC layer in the PVC leather embossing area to obtain the reverse synchronism degree of the inner embossing layer of the PVC leather embossing area; based on the compression degree of the inner PVC layer, the embossing durability of the PVC leather, and the reverse synchronism degree of the inner embossing layer, obtain the PVC compression influence degree of the PVC leather embossing area. The specific method is as follows:

[0075] It should be noted that under normal circumstances, when embossing the PVC leather semi-finished product, mainly the water-based treatment layer on the outermost layer of the PVC leather is extruded and deformed, and after cooling, the water-based treatment layer hardly undergoes obvious deformation; however, when embossing the PVC leather semi-finished product, due to its own loose pore structure, the PVC foam layer is the main area where compression deformation occurs, and the PVC leather may have a small amount of foaming agent residue in the internal foam layer after the pre-foaming process. This part of the foaming agent It will not be decomposed in the embossing working environment, so when the semi-finished PVC leather is embossed, this part of the foaming agent may continue to foam, causing more bubble pores to be generated in the original PVC foaming layer, making it more easily extruded, sharing the deformation pressure received by the water-based treatment layer, and thus reducing the degree of deformation received by the water-based treatment layer; and the embossing edge and the cortical compression hardness belong to an overall relationship of reverse synchronous change; therefore, the reverse synchronous relationship between the embossing edge and the internal cortical compression hardness in the embossing area of the PVC leather can be analyzed to obtain the reverse synchronous degree of the internal cortex of the embossing area of the PVC leather. Among them, if the reverse synchronous degree of the internal cortex of the embossing is larger, it means that the change relationship between the PVC foaming layer and the water-based treatment layer under the embossing area of the PVC leather is more reverse, reflecting that the embossing indentation in the embossing area of the PVC leather is clearer and not easy to blur. Please refer to Figure 3 , which shows a schematic diagram of the embossing extrusion of the water-based treatment layer and the PVC foaming layer, where the forces applied in the embossing indentation pressing directions in the left and right figures are the same.

[0076] Preferably, in some implementation manners of the embodiments of the present invention, the method for obtaining the reverse synchronous degree of the internal cortex of the embossing is: analyzing the correlation between the maintenance duration of the embossing edge and the recovery duration of the internal cortex from the compressed state to the expanded state in the embossing area of the PVC leather to obtain the reverse synchronous degree of the internal cortex of the embossing area of the PVC leather. The specific process is as follows:

[0077] Preset a threshold value of the edge disappearance amount , and use the detection moment when the edge disappearance amount is less than as the embossing duration of the embossing area of the PVC leather; in this embodiment, is used as an example for description, and this embodiment does not make specific limitations, where can be determined according to specific implementation situations.

[0078] Further, as an example, the reverse synchronous degree of the internal cortex of the embossing can be calculated by the following formula:

[0079]

[0080] In the formula, represents the reverse synchronous degree of the internal cortex of the embossing of the th embossing area of the PVC leather; represents the total number of embossing durations of the th embossing area of the PVC leather; represents the total number of leather hardness mitigation periods of the th embossing area of the PVC leather; represents a preset hyperparameter, and in this embodiment, is used as an example for explanation to prevent the denominator from being 0.

[0081] It should be noted that the greater the reverse synchronization degree of the internal cortex of the embossing, the more reverse the change relationship between the PVC foam layer and the water-based treatment layer under the embossed area of the PVC leather, reflecting that the embossing indentation in the embossed area of the PVC leather is clearer and not easy to blur.

[0082] Further, as an example, the PVC compression influence degree can be calculated by the following formula:

[0083]

[0084] In the formula, represents the PVC compression influence degree of the th embossed area of the PVC leather; represents the embossing durability of the th embossed area of the PVC leather; represents the PVC internal cortex compression degree of the th embossed area of the PVC leather; represents the reverse synchronization degree of the embossed internal cortex of the th embossed area of the PVC leather; represents a preset hyperparameter, which is preset as in this embodiment for illustration to prevent the denominator from being 0; represents the exponential function with the natural constant as the base. The embodiment uses model to present the inverse proportional relationship and normalization processing, is the input of the model, and the implementer can select the inverse proportional function and the normalization function according to the actual situation.

[0085] It should be noted that the greater the PVC compression influence degree, the greater the correlation between the embossing trace in the embossed area of the PVC leather and the compression condition of the inner layer of the leather, reflecting that the embossing trace in the embossed area of the PVC leather is more likely to be formed by the inner layer of the leather inside rather than by the deformation of the surface leather itself.

[0086] Thus, the PVC compression influence degree of the embossed area of the PVC leather is obtained through the above method.

[0087] Step S004: Perform adaptive clarity detection on the PVC leather embossing according to the PVC compression influence degree.

[0088] Preset a PVC compression influence degree threshold , and when the PVC compression influence degree is greater than The embossing area of the PVC leather is used as the embossing blurring area of the PVC leather. If there is an embossing blurring area on the leather, it indicates that the embossing clarity of the PVC leather is gradually affected by the subsequent environment, resulting in obvious blurring; if there is no embossing blurring area on the leather, it indicates that the embossing clarity of the PVC leather is not gradually affected by the subsequent environment and no obvious blurring will occur. In this embodiment, is taken as an example for description. This embodiment is not specifically limited, and can be determined according to the specific implementation situation.

[0089] Through the above steps, a method for detecting the embossing clarity of a PVC leather is completed.

[0090] Another embodiment of the present invention provides a system for detecting the embossing clarity of a PVC leather. The system includes a memory and a processor. When the processor executes the computer program stored in the memory, it executes the above method steps S001 to step S004.

[0091] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for detecting the embossing clarity of PVC leather, characterized in that, The method includes the following steps: Obtain a plurality of embossed areas of the PVC leather at different detection times; each embossed area of the PVC leather corresponds to a PVC leather thickness data and a PVC leather hardness data at each detection time; According to the PVC leather thickness data, analyze the rebound recovery of the leather indentation in the same embossed area of the PVC leather at consecutive detection times, and obtain the embossing durability of the embossed area of the PVC leather: Wherein, represents the embossing durability of the th embossing area of the PVC leather; represents the disappearance rate of the embossing edge of the th embossing area of the PVC leather; represents the total number of detection times; represents the PVC leather thickness data of the th embossing area of the PVC leather; represents the continuity integrity of the embossing edge of the th embossing area of the PVC leather at the th detection time; represents the continuity integrity of the embossing edge of the th embossing area of the PVC leather at the th detection time; Embossing edge disappearance rate: In the formula, represents the cumulative sum of the disappearance amounts of all edges of the th PVC leather embossing area; represents the uniformity of the disappearance of the embossed edges of the th PVC leather embossing area; Take the mean value of all edge disappearance amounts of the embossed area of the PVC leather as the embossing edge disappearance uniformity of the embossed area of the PVC leather; Obtain a plurality of edge pixel points of the embossed area of the PVC leather at each detection time through the Canny edge algorithm; take the reduction amount of the edge pixel points of the embossed area of the PVC leather between two detection times as the edge disappearance amount; Taking any edge pixel point of the embossed area of the PVC leather at any detection time as an example, take the minimum distance between this edge pixel point and other edge pixel points as the pixel edge interval distance of this edge pixel point; take the variance of the pixel edge interval distances of all edge pixel points of the embossed area of the PVC leather at this detection time as the embossing edge continuity integrity of the embossed area of the PVC leather at this detection time; According to the PVC leather hardness data, analyze the compression strength of different leather layers inside the leather in the same embossed area of the PVC leather at consecutive detection times, and obtain the internal leather layer compression degree of the embossed area of the PVC leather: In the formula, represents the compression degree of the inner PVC layer of the th PVC leather embossing area; represents the pressure resistance of the inner PVC layer of the th PVC leather embossing area; represents the total number of leather hardness reduction periods of the th PVC leather embossing area; represents the leather softening amount of the th leather hardness reduction period of the th PVC leather embossing area; Taking any two adjacent detection times as an example, among these two detection times, if the PVC leather hardness data of the embossed area of the PVC leather at the second detection time is greater than the PVC leather hardness data at the first detection time, then take the second detection time as the leather hardness slowdown time of the embossed area of the PVC leather; obtain all leather hardness slowdown times of the embossed area of the PVC leather; take the time period formed by consecutive leather hardness slowdown times as the leather hardness slowdown period, and take the mean value of the number of detection times between all adjacent leather hardness slowdown periods as the internal layer compression strength of the embossed area of the PVC leather; Take the absolute value of the difference between the PVC leather hardness data between the first leather hardness slowdown time and the last leather hardness slowdown time in each leather hardness slowdown period as the PVC leather hardness softening amount of each leather hardness slowdown period; According to the internal leather layer compression degree of the PVC leather and the embossing durability of the PVC leather, comprehensively analyze the influence of the internal leather layer of the same embossed area of the PVC leather on maintaining the embossed shape, and obtain the PVC compression influence degree of the embossed area of the PVC leather: In the formula, represents the PVC compression influence degree of the th PVC leather embossing area; represents the embossing durability of the th PVC leather embossing area; represents the reverse synchronization degree of the inner cortex of the embossing in the th PVC leather embossing area; represents a preset hyperparameter used to prevent the denominator from being zero; Embossing internal leather layer reverse synchronization degree: In the formula, represents the total number of embossing durations of the th PVC leather embossing area; represents the total number of leather hardness reduction periods of the th PVC leather embossing area; represents a preset hyperparameter used to prevent the denominator from being zero; Preset a threshold value for the edge disappearance amount , and take the detection moment when the edge disappearance amount is less than as the embossing duration of the embossed area of the PVC leather material; Adaptive clarity detection of embossing on PVC leather according to the influence degree of PVC compression, including: presetting a threshold value of the influence degree of PVC compression , and taking the embossing area of the PVC leather with the influence degree of PVC compression greater than as the embossing blurred area of the PVC leather.

2. A detection system for the embossing clarity of PVC leather, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the computer program is executed by a processor, it realizes the steps of a method for detecting the embossing clarity of a PVC leather as described in claim 1.

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