Leather product surface treatment visual detection system and detection method

Abstract

The invention relates to the technical field of leather product production equipment, in particular to a leather product surface treatment visual inspection system and method.The leather product surface treatment visual inspection system comprises a control mechanism and an installation mechanism, and the installation mechanism is sequentially provided with an image collecting and processing mechanism, a surface repairing mechanism and a defect marking mechanism; the image collecting and processing mechanism is located at the top of the discharging section of the leather surface processing device and collects a processed leather surface image; through cooperation of the image collecting and processing mechanism, the surface repairing mechanism and the defect marking mechanism, leather subjected to surface treatment is directly subjected to surface quality detection, defects capable of being repaired on the surface of the leather are directly repaired, defects which cannot be repaired on the surface of the leather are marked, and the detection efficiency is improved. And the treated leather does not need to be transferred to independent detection equipment again, so that the midway transfer time and repair time of the leather are shortened, and the leather surface treatment efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of leather product production equipment, and in particular relates to a leather product surface treatment visual inspection system and inspection method. Background Art

[0002] In the production of leather products, leather is smoothed and finished by using pigment pastes, dyes and film-forming agents to improve its appearance and performance.

[0003] As shown in the patent document application number 202222916021.0, a surface treatment device for artificial leather is disclosed, including a leather winder, a base, a limit assembly, an expansion assembly, a drive assembly and a support member, wherein the leather winder is installed on the base, the limit assembly is arranged on one side of the leather winder, the expansion assembly is arranged on the limit assembly and is movably matched with the limit assembly, a plurality of support members are provided and are evenly arranged on the expansion assembly, the drive assembly is installed on the limit assembly, and one end of the drive assembly is connected to the expansion assembly through the limit assembly. The device can enable the area to be processed on the surface of the artificial leather to be fully stretched, and thus when applying the finishing agent, uneven coating of the surface to be processed of the artificial leather can be avoided.

[0004] However, after the above equipment has treated the leather surface, additional testing equipment is needed to conduct quality testing on the coated leather to ensure the production quality of the leather products. However, the additional use of testing equipment will increase the time for processing each batch of leather, resulting in an extension of the production cycle and affecting the leather production efficiency. Therefore, we need to propose a leather product surface treatment visual inspection system and inspection method, so that it can perform quality inspection on the leather surface treatment while treating the leather surface, reduce the time for leather surface treatment, and thus improve the efficiency of leather surface treatment. Summary of the invention

[0005] In view of the above problems, the present invention provides a leather product surface treatment visual inspection system, comprising a control mechanism and a mounting mechanism, on which an image acquisition and processing mechanism, a surface repair mechanism and a defect marking mechanism are sequentially mounted, and the control mechanism is electrically connected to the image acquisition and processing mechanism, the surface repair mechanism and the defect marking mechanism respectively;

[0006] The image acquisition and processing mechanism acquires and processes the leather surface image, and analyzes and processes to find out the position of the leather surface defects; the image acquisition and processing mechanism includes an image acquisition unit and an image processing unit, and the image processing unit is electrically connected to the image acquisition unit and the control mechanism respectively;

[0007] The surface repair mechanism repairs the leather surface coating abnormal area according to the image data sampled by the image acquisition and processing mechanism;

[0008] The defect marking mechanism is used to collect image information of the repaired leather surface, and determine whether there is any abnormality according to the condition of the repaired leather surface, and mark the abnormal area when there is any abnormality;

[0009] The defect marking mechanism includes a horizontal moving component and a third electric push rod installed on the horizontal moving component, a support plate is installed at the lower end of the third electric push rod, a marking pen is installed on the support plate, the horizontal moving component is connected to the mounting mechanism through a plurality of connecting rods, a second high-definition camera for collecting image information of the repaired leather is installed on the horizontal moving component, and the second high-definition camera is electrically connected to the image processing unit;

[0010] The control mechanism is used to control the surface repair mechanism and the defect marking mechanism to perform surface repair and mark the defects that cannot be repaired according to the leather surface defect positions analyzed by the image acquisition and processing mechanism.

[0011] Furthermore, the image acquisition unit includes a first electric push rod installed on the mounting mechanism, a U-shaped seat is installed at the lower end of the first electric push rod, a rotating shaft is rotatably installed inside the U-shaped seat, a first mounting seat is fixedly sleeved on the outer side of the rotating shaft, a first high-definition camera is installed at the lower end of the first mounting seat by a fixing screw, and a first motor is installed at one end of the rotating shaft.

[0012] Furthermore, the image processing unit performs analysis and processing after receiving the image information collected by the first high-definition camera. The analysis and processing flow is as follows:

[0013] A1. Perform wavelet packet decomposition on the collected leather images to obtain multiple sub-band images;

[0014] A2. In each sub-band image, denoising is performed separately according to the characteristic differences of signal and noise in different sub-bands;

[0015] A3. Perform histogram equalization on the denoised sub-band image to improve the contrast and quality of the image. The formula for histogram equalization is as follows:

[0016]

[0017] Among them, N is the total number of pixels, L is the total number of pixels in the image, and n j is the number of pixels of the jth gray level, num is the number of gray levels, S k is the cumulative probability of the kth gray level;

[0018] A4. Arrange multiple sub-band images in a matrix and extract the image texture feature vector arranged in the matrix. The image texture feature vector extraction formula is as follows:

[0019]

[0020] Among them, E is the energy used to reflect the uniformity of image grayscale distribution and texture coarseness, C is the contrast used to reflect image clarity and texture groove depth, H is the entropy used to represent the amount of information in the image, I is the inverse difference used to reflect the size of local changes in image texture, N is the image grayscale level, P is an N*N matrix, and P(i,j) represents the number of times adjacent pairs of pixels with grayscale value i and pixels with grayscale value j appear in the image;

[0021] A5. Perform mean cluster analysis on the extracted image texture features to detect the defective areas on the leather surface. The mean cluster analysis calculation formula is as follows:

[0022]

[0023] Among them, M is the number of samples, C is the number of cluster centers, m is the fuzzy index, u ij is the membership of sample i to cluster center j, x i is the sample feature vector, v j is the cluster center vector.

[0024] Furthermore, the surface repair mechanism includes a fixed plate and a storage box installed on the upper end of the fixed plate, the storage box is used to store the paint applied to the leather surface, the upper end of the fixed plate is connected to the installation mechanism through a second electric push rod, and the lower end of the fixed plate is fixed with a coating mechanism and an air dryer, and the coating mechanism and the air dryer are respectively located at both ends of the fixed plate, and the lower end of the storage box is connected to the coating mechanism through a plurality of drip tubes, and an electromagnetic valve is installed on the drip tube, and the plurality of electromagnetic valves are all connected to the control mechanism.

[0025] Furthermore, the coating mechanism includes a third mounting seat, and a coating roller is rotatably mounted inside the third mounting seat. The coating roller is configured as a mesh roller with a mesh surface. A plurality of drip tubes are equidistantly distributed at the upper end of the coating roller, and the lower end of the coating roller extends to the bottom of the third mounting seat.

[0026] Furthermore, the material storage box includes a box body, a stirring shaft is rotatably installed inside the box body, a plurality of stirring rods are equidistantly arranged on the outer wall of the stirring shaft, a second motor is installed at one end of the stirring shaft, a feed pipe is arranged at the upper end of the box body, and a plug cap is threadedly connected to one end of the feed pipe.

[0027] Furthermore, the horizontal moving assembly includes a moving seat, the internal rotation of the moving seat is connected to a screw rod, the external thread of the screw rod is connected to a moving block, and the moving block is slidably connected to the moving seat, a driving motor is installed at one end of the screw rod, and the third electric push rod is installed at the lower end of the moving block.

[0028] Furthermore, the process of the control mechanism generating a driving signal for controlling surface repair or defect marking is as follows:

[0029] B1. Scanning the leather surface through an image acquisition unit to obtain original image data of the leather surface;

[0030] B2, the image processing unit analyzes the original image data and identifies the information of the defect location and type on the leather surface;

[0031] B3. The control mechanism makes a judgment based on the defect status analyzed by the image processing unit. If the defect needs to be repaired, the control mechanism generates a corresponding repair control instruction; if the defect does not need to be repaired but needs to be marked, the control mechanism generates a corresponding marking control instruction;

[0032] B4. Convert the repair control instruction and the marking control instruction into a specific driving signal, and drive the surface repair mechanism or the defect marking mechanism to perform surface repair or defect marking through the driving signal; at the same time, the control mechanism will also generate a defect marking driving signal for the position where the defect still exists according to the defect result of the repaired leather surface image collected by the second high-definition camera by the image processing unit, and drive the defect marking mechanism to mark the defect position;

[0033] B5. Controlling the working parameters of the surface repair mechanism through the repair driving signal. The working parameters of the surface repair mechanism include running speed, direction, etc., so as to realize the repair operation of the leather surface defects;

[0034] B5. The defect surface marking mechanism is controlled by the marking drive signal to accurately mark the defect location and related information on the leather according to the defect location and size.

[0035] Furthermore, the mounting mechanism includes two symmetrically arranged L-shaped plates, a plurality of horizontal plates are fixed between the two L-shaped plates, the plurality of horizontal plates are respectively connected to the image acquisition and processing mechanism, the surface repair mechanism and the defect marking mechanism, and a plurality of screw holes are equidistantly provided at the upper end of the L-shaped plate.

[0036] Based on the above-described visual inspection system for leather product surface treatment, the present invention further provides a visual inspection method for leather product surface treatment, comprising the following steps:

[0037] S1. Scanning the leather surface by an image acquisition and processing mechanism installed at the top of the discharge section of the leather surface treatment device to obtain original image data of the leather surface, and analyzing and processing the acquired image to find out the defect position of the leather surface;

[0038] S2. The control agency evaluates and determines the detected defects to confirm whether the defects on the leather need to be repaired;

[0039] S21, when repair is needed, the control mechanism generates a repair control instruction to control the surface repair mechanism to repair the leather surface;

[0040] S22, when repair is not required but marking is required, the control mechanism generates a marking control instruction to control the defect marking mechanism to mark the defect position;

[0041] S23, when neither repair nor marking is required, the defect marking mechanism performs secondary image acquisition on the leather surface;

[0042] S3. The defect marking mechanism collects the leather surface image for the second time through the second high-definition camera and transmits it to the image processing unit for analysis. If defects still exist after the secondary image analysis, the leather defect position is marked with a marking pen. If there are no defects on the leather surface after the secondary image analysis, the leather is transmitted normally.

[0043] The beneficial effects of the present invention are:

[0044] 1. The present invention enables the surface quality of leather after surface treatment to be directly inspected through the cooperation of an image acquisition and processing mechanism, a surface repair mechanism and a defect marking mechanism. Defects on the leather surface that can be repaired are directly repaired, and defects on the leather surface that cannot be repaired are marked. There is no need to transfer the treated leather to a separate inspection device again, which shortens the transfer time and repair time of the leather and improves the efficiency of leather surface treatment.

[0045] 2. The present invention can accurately identify the defect information on the leather surface and determine whether the defect can be repaired by visual detection through the cooperation of the image acquisition unit and the image processing unit, thereby improving the accuracy of leather surface defect analysis.

[0046] 3. The present invention can perform dual visual inspection on the treated leather through the cooperation of the second high-definition camera, the image acquisition unit and the image processing unit, thereby improving the accuracy of leather surface quality inspection, reducing the probability of missing defects, and thus improving the quality of leather surface treatment.

[0047] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A system block diagram according to an embodiment of the present invention is shown;

[0050] Figure 2 A schematic diagram of the structure of an embodiment of the present invention is shown;

[0051] Figure 3 It shows a schematic structural diagram of a surface repair mechanism according to an embodiment of the present invention;

[0052] Figure 4 A schematic cross-sectional structure diagram of a surface repair mechanism according to an embodiment of the present invention is shown;

[0053] Figure 5 A schematic diagram of the structure of a defect marking mechanism according to an embodiment of the present invention is shown;

[0054] Figure 6 A schematic diagram of the structure of an image acquisition unit according to an embodiment of the present invention is shown;

[0055] Figure 7 It shows a schematic diagram of the structure of the installation mechanism according to an embodiment of the present invention;

[0056] Figure 8 A schematic flow chart of a detection method according to an embodiment of the present invention is shown.

[0057] In the figure: 1. Image acquisition and processing mechanism; 11. First electric push rod; 12. U-shaped seat; 13. First mounting seat; 14. First high-definition camera; 15. Fixing screw; 16. First motor; 17. Rotating shaft; 2. Surface repair mechanism; 21. Fixing plate; 22. Third mounting seat; 23. Air dryer; 24. Second electric push rod; 25. Storage box; 251. Box body; 252. Second motor; 253. Stirring shaft; 254 , stirring rod; 255, drip tube; 26, coating roller; 27, feeding pipe; 3, defect marking mechanism; 31, moving seat; 32, driving motor; 33, screw rod; 34, moving block; 35, third electric push rod; 36, supporting plate; 37, marking pen; 38, connecting rod; 39, fixed seat; 310, second mounting seat; 311, second high-definition camera; 4, mounting mechanism; 41, L-shaped plate; 42, horizontal plate; 43, screw hole. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The embodiment of the present invention provides a leather product surface treatment visual inspection system, such as Figure 1-8 As shown, it includes a control mechanism and a mounting mechanism 4, on which an image acquisition and processing mechanism 1, a surface repair mechanism 2 and a defect marking mechanism 3 are sequentially mounted, and the mounting mechanism 4 is used to connect with the top of the leather surface treatment device, and the image acquisition and processing mechanism 1 is located at the top of the discharge section of the leather surface treatment device, and the image acquisition and processing mechanism 1 acquires the leather surface image after processing, and analyzes and processes to find out the position of the leather surface defect, and the surface repair mechanism 2 repairs the leather surface coating abnormal area according to the image data sampled by the image acquisition and processing mechanism 1, and the defect marking mechanism 3 is used to acquire the leather surface image information after repair, and determine whether there is an abnormality according to the leather surface condition after repair, and mark the abnormal area when there is an abnormality, and the control mechanism is electrically connected to the image acquisition and processing mechanism 1, the surface repair mechanism 2 and the defect marking mechanism 3 respectively, and the control mechanism is used to control the surface repair mechanism 2 and the defect marking mechanism 3 to perform surface repair and mark the defects that cannot be repaired according to the leather surface defect position analyzed by the image acquisition and processing mechanism 1.

[0060] The leather surface treatment device uses a leather winder to transport the leather, so that the leather is horizontally transported in the leather surface treatment device in the manner of an assembly line flow. During the transportation process, the leather is coated in the processing area. After the coating is completed, the leather passes through the image acquisition and processing mechanism 1, the surface repair mechanism 2 and the defect marking mechanism 3 in turn and is then rolled up. This leather surface treatment device is a prior art in the field and will not be described in detail here.

[0061] Through the cooperation of the image acquisition and processing mechanism 1, the surface repair mechanism 2 and the defect marking mechanism 3, the surface quality of the leather after surface treatment can be directly inspected, and the defects on the leather surface that can be repaired are directly repaired, and the defects on the leather surface that cannot be repaired are marked. There is no need to transfer the treated leather to a separate inspection device again, which shortens the transfer time and repair time of the leather and improves the efficiency of the leather surface treatment.

[0062] The image acquisition and processing mechanism 1 includes an image acquisition unit and an image processing unit. The image processing unit is electrically connected to the image acquisition unit and the control mechanism respectively, so that the control mechanism can generate a driving signal for controlling surface repair or defect marking according to the leather surface defect state analyzed by the image processing unit. Through the cooperation of the image acquisition unit and the image processing unit, the defect information of the leather surface and the judgment of whether the defect can be repaired can be accurately identified by visual detection, thereby improving the accuracy of leather surface defect analysis.

[0063] like Figure 6 As shown, the image acquisition unit includes a first electric push rod 11 installed on the mounting mechanism 4, a U-shaped seat 12 is installed at the lower end of the first electric push rod 11, a rotating shaft 17 is rotatably installed inside the U-shaped seat 12, a first mounting seat 13 is fixed to the outer sleeve of the rotating shaft 17, a first high-definition camera 14 is installed at the lower end of the first mounting seat 13 through a fixing screw 15, a first motor 16 is installed at one end of the rotating shaft 17, the first mounting seat 13 is driven to move up and down by the first electric push rod 11, so that the first mounting seat 13 drives the first high-definition camera 14 to rise or fall, so as to adjust the height of the first high-definition camera 14, thereby adjusting the shooting range of the first high-definition camera 14, and the rotating shaft 17 is driven to rotate by the first motor 16, so that the rotating shaft 17 drives the first mounting seat 13 to adjust the tilt angle, so as to increase the shooting range of the leather below.

[0064] The image processing unit performs analysis and processing after receiving the image information collected by the first high-definition camera 14. The analysis and processing process is as follows:

[0065] A1. Perform wavelet packet decomposition on the collected leather images to obtain multiple sub-band images;

[0066] A2. In each sub-band image, denoising is performed according to the differences in the characteristics of the signal and noise in different sub-bands. For example, for low-frequency sub-bands, more information needs to be retained to maintain the overall structure of the image; for high-frequency sub-bands, noise is removed by setting a threshold.

[0067] A3. Perform histogram equalization on the denoised sub-band image to improve the contrast and quality of the image. The formula for histogram equalization is as follows:

[0068]

[0069] Among them, N is the total number of pixels, L is the total number of pixels in the image, and n j is the number of pixels of the jth gray level, num is the number of gray levels, S k is the cumulative probability of the kth gray level;

[0070] A4. Arrange multiple sub-band images in a matrix and extract the image texture feature vector arranged in the matrix. The image texture feature vector extraction formula is as follows:

[0071]

[0072] Among them, E is the energy used to reflect the uniformity of image grayscale distribution and texture coarseness, C is the contrast used to reflect image clarity and texture groove depth, H is the entropy used to represent the amount of information in the image, I is the inverse difference used to reflect the size of local changes in image texture, N is the image grayscale level, P is an N*N matrix, and P(i,j) represents the number of times adjacent pairs of pixels with grayscale value i and pixels with grayscale value j appear in the image;

[0073] A5. Perform mean cluster analysis on the extracted image texture features to detect the defective areas on the leather surface. The mean cluster analysis calculation formula is as follows:

[0074]

[0075] Among them, M is the number of samples, C is the number of cluster centers, m is the fuzzy index, u ij is the membership of sample i to cluster center j, x i is the sample feature vector, v j is the cluster center vector.

[0076] like Figure 3-4As shown, the surface repair mechanism 2 includes a fixed plate 21 and a storage box 25 installed on the upper end of the fixed plate 21, the storage box 25 is used to store the paint applied to the leather surface, the upper end of the fixed plate 21 is connected to the installation mechanism 4 through the second electric push rod 24, the lower end of the fixed plate 21 is fixed with a coating mechanism and an air dryer 23, the coating mechanism and the air dryer 23 are respectively located at the two ends of the fixed plate 21, the lower end of the storage box 25 is connected with the coating mechanism through a plurality of drip tubes 255, and the drip tubes 255 are installed with solenoid valves, and the plurality of solenoid valves are connected to the control mechanism, the fixed plate 21 is driven to rise and fall by the second electric push rod 24, so that the fixed plate 21 drives the coating mechanism to contact with the leather surface, so as to perform coating operation on the leather surface, and the air dryer 23 is used to dry the paint on the coated leather surface, so as to accelerate the drying rate of the paint.

[0077] The coating mechanism includes a third mounting seat 22, and a coating roller 26 is rotatably mounted inside the third mounting seat 22. The coating roller 26 is configured as a mesh roller with a mesh surface. A plurality of drip tubes 255 are equidistantly distributed on the upper end of the coating roller 26, and the lower end of the coating roller 26 extends to the bottom of the third mounting seat 22, so that when the fixed plate 21 descends, the lower surface of the coating roller 26 can contact the leather surface, and the moving leather is used to drive the coating roller 26 to rotate in the third mounting seat 22 to repair the leather surface.

[0078] The material storage box 25 includes a box body 251, in which a stirring shaft 253 is rotatably installed, and a plurality of stirring rods 254 are equidistantly arranged on the outer wall of the stirring shaft 253. A second motor 252 is installed at one end of the stirring shaft 253. A feeding pipe 27 is provided at the upper end of the box body 251, and a plug cover is threadedly connected to one end of the feeding pipe 27, so that the plug cover is detachable. The plug cover is removed to facilitate adding the paint to be applied into the material storage box 25. The stirring shaft 253 is driven to rotate by the second motor 252, so that the stirring shaft 253 drives the stirring rods 254 to rotate inside the box body 251, so as to stir the paint inside the box body 251 and improve the uniformity of the paint mixing.

[0079] like Figure 5As shown, the defect marking mechanism 3 includes a horizontal moving component and a third electric push rod 35 installed on the horizontal moving component, a support plate 36 is installed at the lower end of the third electric push rod 35, a marking pen 37 is installed on the support plate 36, the horizontal moving component is connected to the mounting mechanism 4 through a plurality of connecting rods 38, a second high-definition camera 311 for collecting image information of the repaired leather is installed on the horizontal moving component, the second high-definition camera 311 is electrically connected to the image processing unit, and is used to drive the third electric push rod 35 to move longitudinally through the horizontal moving component, so that the marking pen 37 can move to the defect position to be marked to mark the defect position, and the second high-definition camera 311 is used to collect image information of the repaired leather surface, and the image processing unit analyzes and processes the image information collected by the second high-definition camera 311 to confirm whether there are still defects on the repaired leather surface, and marks the defect position for the leather that still has defects, and does not mark the leather without defects, and directly performs the winding work.

[0080] Through the cooperation of the second high-definition camera 311, the image acquisition unit and the image processing unit, the processed leather can be subjected to dual visual inspection, thereby improving the accuracy of leather surface quality inspection, reducing the probability of defect omission, and thus improving the quality of leather surface treatment.

[0081] The horizontal moving assembly includes a moving seat 31, the internal rotation of the moving seat 31 is connected to a screw rod 33, the external thread of the screw rod 33 is connected to a moving block 34, and the moving block 34 is slidably connected to the moving seat 31, one end of the screw rod 33 is installed with a driving motor 32, and the third electric push rod 35 is installed at the lower end of the moving block 34. The driving motor 32 drives the screw rod 33 to rotate, so that the screw rod 33 cooperates with the thread of the moving block 34, so that the moving block 34 can move horizontally on the screw rod 33 to adjust the position of the marking pen 37, and the support plate 36 is driven to descend by the third electric push rod 35 so that the marking pen 37 can contact the leather surface for marking.

[0082] A fixed seat 39 is fixed to the upper end of the movable seat 31, and a second mounting seat 310 is installed on the fixed seat 39. The second high-definition camera 311 is installed on the lower end of the second mounting seat 310 by means of fixing screws 15. The second high-definition camera 311 is supported by the second mounting seat 310, and the second mounting seat 310 is supported by the fixed seat 39 to improve the stability of the installation of the second high-definition camera 311.

[0083] The process of the control mechanism generating a driving signal for controlling surface repair or defect marking is as follows:

[0084] B1. Scanning the leather surface through an image acquisition unit to obtain original image data of the leather surface;

[0085] B2. The image processing unit analyzes the original image data and identifies the location and type of defects on the leather surface for more accurate positioning and identification;

[0086] B3. The control mechanism makes a judgment based on the defect status analyzed by the image processing unit. If the defect needs to be repaired, the control mechanism generates a corresponding repair control instruction; if the defect does not need to be repaired but needs to be marked, the control mechanism generates a corresponding marking control instruction;

[0087] B4, converting the repair control instruction and the marking control instruction into a specific driving signal, and driving the surface repair mechanism 2 or the defect marking mechanism 3 to perform surface repair or defect marking through the driving signal; at the same time, the control mechanism will also generate a defect marking driving signal for the position where the defect still exists according to the defect result of the repaired leather surface image collected by the second high-definition camera 311 by the image processing unit, and drive the defect marking mechanism 3 to mark the defect position;

[0088] B5. Controlling the working parameters of the surface repair mechanism 2 through the repair driving signal. The working parameters of the surface repair mechanism 2 include running speed, direction, etc., so as to realize the repair operation of the leather surface defects;

[0089] B5. The defect surface marking mechanism is controlled by the marking drive signal to accurately mark the defect location and related information on the leather according to the defect location and size.

[0090] like Figure 7 As shown, the mounting mechanism 4 includes two symmetrically arranged L-shaped plates 41, a plurality of horizontal plates 42 are fixed between the two L-shaped plates 41, and the plurality of horizontal plates 42 are respectively connected to the image acquisition and processing mechanism 1, the surface repair mechanism 2 and the defect marking mechanism 3. A plurality of screw holes 43 are equidistantly provided at the upper end of the L-shaped plate 41. The L-shaped plate 41 is hung on both sides of the top of the leather surface treatment device, and then the locking bolts are threadedly connected in the screw holes 43. The L-shaped plate 41 is fixed to the leather surface treatment device by passing the locking bolts through the screw holes 43, so as to improve the firmness of the installation of the visual inspection system.

[0091] Based on the above-described visual inspection system for leather product surface treatment, the present invention also provides a visual inspection method for leather product surface treatment, such as Figure 8 As shown, the following steps are included:

[0092] S1, scanning the leather surface by an image acquisition and processing mechanism 1 installed at the top of the discharge section of the leather surface treatment device, obtaining original image data of the leather surface, and analyzing and processing the acquired image to find out the defect position of the leather surface;

[0093] S2. The control agency evaluates and determines the detected defects to confirm whether the defects on the leather need to be repaired;

[0094] S21, when repair is needed, the control mechanism generates a repair control instruction to control the surface repair mechanism 2 to repair the leather surface;

[0095] S22, when repair is not required but marking is required, the control mechanism generates a marking control instruction to control the defect marking mechanism 3 to mark the defect position;

[0096] S23, when neither repair nor marking is required, the defect marking mechanism 3 performs secondary image acquisition on the leather surface;

[0097] S3, the defect marking mechanism 3 collects the leather surface image for the second time through the second high-definition camera 311, and transmits it to the image processing unit for analysis and processing. If defects still exist after the secondary image analysis, the leather defect position is marked by the marking pen 37. If there are no defects on the leather surface after the secondary image analysis, the leather is transmitted normally to facilitate the rolling of the leather.

[0098] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A leather product surface treatment visual inspection system, characterized in that: It comprises a control mechanism and a mounting mechanism (4), wherein an image acquisition and processing mechanism (1), a surface repair mechanism (2) and a defect marking mechanism (3) are sequentially mounted on the mounting mechanism (4), and the control mechanism is electrically connected to the image acquisition and processing mechanism (1), the surface repair mechanism (2) and the defect marking mechanism (3) respectively; The image acquisition and processing mechanism (1) acquires and processes the leather surface image, and analyzes and processes the image to find the position of the leather surface defect; the image acquisition and processing mechanism (1) comprises an image acquisition unit and an image processing unit, and the image processing unit is electrically connected to the image acquisition unit and the control mechanism respectively; The surface repair mechanism (2) repairs the abnormal coating area on the leather surface according to the image data sampled by the image acquisition and processing mechanism (1); The defect marking mechanism (3) is used to collect image information of the repaired leather surface and determine whether there is any abnormality based on the condition of the repaired leather surface, and mark the abnormal area if there is any abnormality. The defect marking mechanism (3) comprises a horizontal moving component and a third electric push rod (35) mounted on the horizontal moving component, a support plate (36) is mounted on the lower end of the third electric push rod (35), a marking pen (37) is mounted on the support plate (36), the horizontal moving component is connected to the mounting mechanism (4) via a plurality of connecting rods (38), a second high-definition camera (311) for collecting image information of the repaired leather is mounted on the horizontal moving component, and the second high-definition camera (311) is electrically connected to the image processing unit; The control mechanism is used to control the surface repair mechanism (2) and the defect marking mechanism (3) to perform surface repair and mark defects that cannot be repaired according to the position of the leather surface defect analyzed by the image acquisition and processing mechanism (1).

2. A leather product surface treatment visual inspection system according to claim 1, characterized in that: The image acquisition unit comprises a first electric push rod (11) mounted on a mounting mechanism (4); a U-shaped seat (12) is mounted at the lower end of the first electric push rod (11); a rotating shaft (17) is rotatably mounted inside the U-shaped seat (12); a first mounting seat (13) is sleeved and fixed outside the rotating shaft (17); a first high-definition camera (14) is mounted at the lower end of the first mounting seat (13) via a fixing screw (15); and a first motor (16) is mounted at one end of the rotating shaft (17).

3. A leather product surface treatment visual inspection system according to claim 2, characterized in that: The image processing unit performs analysis and processing after receiving the image information collected by the first high-definition camera (14), and the analysis and processing flow is as follows: A1. Perform wavelet packet decomposition on the collected leather images to obtain multiple sub-band images; A2. In each sub-band image, denoising is performed separately according to the characteristic differences of signal and noise in different sub-bands; A3. Perform histogram equalization on the denoised sub-band image to improve the contrast and quality of the image. The formula for histogram equalization is as follows: Among them, N is the total number of pixels, L is the total number of pixels in the image, and n j is the number of pixels of the jth gray level, num is the number of gray levels, S k is the cumulative probability of the kth gray level; A4. Arrange multiple sub-band images in a matrix and extract the image texture feature vector arranged in the matrix. The image texture feature vector extraction formula is as follows: Among them, E is the energy used to reflect the uniformity of image grayscale distribution and texture coarseness, C is the contrast used to reflect image clarity and texture groove depth, H is the entropy used to represent the amount of information in the image, I is the inverse difference used to reflect the size of local changes in image texture, N is the image grayscale level, P is an N*N matrix, and P(i,j) represents the number of times adjacent pairs of pixels with grayscale value i and pixels with grayscale value j appear in the image; A5. Perform mean cluster analysis on the extracted image texture features to detect the defective areas on the leather surface. The mean cluster analysis calculation formula is as follows: Among them, M is the number of samples, C is the number of cluster centers, m is the fuzzy index, u ij is the membership of sample i to cluster center j, x i is the sample feature vector, v j is the cluster center vector.

4. A leather product surface treatment visual inspection system according to claim 3, characterized in that: The surface repair mechanism (2) comprises a fixed plate (21) and a storage box (25) installed at the upper end of the fixed plate (21), the storage box (25) being used to store the coating to be applied to the leather surface, the upper end of the fixed plate (21) being connected to the mounting mechanism (4) via a second electric push rod (24), the lower end of the fixed plate (21) being fixed with a coating mechanism and an air dryer (23), the coating mechanism and the air dryer (23) being respectively located at the two ends of the fixed plate (21), the lower end of the storage box (25) being connected to the coating mechanism via a plurality of dripping tubes (255), and a solenoid valve being installed on the dripping tubes (255), and the plurality of solenoid valves being connected to the control mechanism.

5. A leather product surface treatment visual inspection system according to claim 4, characterized in that: The coating mechanism comprises a third mounting seat (22), a coating roller (26) is rotatably mounted inside the third mounting seat (22), the coating roller (26) is configured as a mesh roller with a mesh pattern on the surface, a plurality of drip tubes (255) are equidistantly distributed at the upper end of the coating roller (26), and the lower end of the coating roller (26) extends to below the third mounting seat (22).

6. A leather product surface treatment visual inspection system according to claim 5, characterized in that: The material storage box (25) comprises a box body (251), a stirring shaft (253) is rotatably mounted inside the box body (251), a plurality of stirring rods (254) are equidistantly arranged on the outer wall of the stirring shaft (253), a second motor (252) is mounted on one end of the stirring shaft (253), a feeding pipe (27) is arranged at the upper end of the box body (251), and a plug cap is threadedly connected to one end of the feeding pipe (27).

7. A leather product surface treatment visual inspection system according to claim 6, characterized in that: The horizontal moving assembly comprises a moving seat (31), the interior of the moving seat (31) is rotatably connected to a screw rod (33), the exterior of the screw rod (33) is threadedly connected to a moving block (34), and the moving block (34) is slidably connected to the moving seat (31), a driving motor (32) is installed at one end of the screw rod (33), and the third electric push rod (35) is installed at the lower end of the moving block (34).

8. The leather product surface treatment visual inspection system according to claim 7, characterized in that: The process of the control mechanism generating a driving signal for controlling surface repair or defect marking is as follows: B1. Scanning the leather surface through an image acquisition unit to obtain original image data of the leather surface; B2, the image processing unit analyzes the original image data and identifies the information of the defect location and type on the leather surface; B3. The control mechanism makes a judgment based on the defect status analyzed by the image processing unit. If the defect needs to be repaired, the control mechanism generates a corresponding repair control instruction; If the defect does not need to be repaired but needs to be marked, the corresponding marking control instruction will be generated; B4, converting the repair control instruction and the marking control instruction into a specific driving signal, and driving the surface repair mechanism (2) or the defect marking mechanism (3) to perform surface repair or defect marking through the driving signal; at the same time, the control mechanism will also generate a defect marking driving signal for the position where the defect still exists according to the defect result of the repaired leather surface image collected by the second high-definition camera (311) by the image processing unit, and drive the defect marking mechanism (3) to mark the defect position; B5. Controlling the working parameters of the surface repair mechanism (2) by means of the repair driving signal, wherein the working parameters of the surface repair mechanism (2) include running speed, direction, etc., so as to realize the repair operation of the leather surface defects; B5. The defect surface marking mechanism is controlled by the marking drive signal to accurately mark the defect location and related information on the leather according to the defect location and size.

9. A leather product surface treatment visual inspection system according to claim 8, characterized in that: The mounting mechanism (4) comprises two symmetrically arranged L-shaped plates (41), a plurality of transverse plates (42) being fixed between the two L-shaped plates (41), the plurality of transverse plates (42) being respectively connected to the image acquisition and processing mechanism (1), the surface repair mechanism (2) and the defect marking mechanism (3), and a plurality of screw holes (43) being equidistantly formed at the upper end of the L-shaped plate (41).

10. A method for visual inspection of leather product surface treatment, based on a system for visual inspection of leather product surface treatment according to any one of claims 1 to 9, characterized in that: The steps include: S1. Scanning the leather surface by an image acquisition and processing mechanism installed at the top of the discharge section of the leather surface treatment device to obtain original image data of the leather surface, and analyzing and processing the acquired image to find out the defect position of the leather surface; S2. The control agency evaluates and determines the detected defects to confirm whether the defects on the leather need to be repaired; S21, when repair is needed, the control mechanism generates a repair control instruction to control the surface repair mechanism to repair the leather surface; S22, when repair is not required but marking is required, the control mechanism generates a marking control instruction to control the defect marking mechanism to mark the defect position; S23, when neither repair nor marking is required, the defect marking mechanism performs secondary image acquisition on the leather surface; S3. The defect marking mechanism collects the leather surface image for the second time through the second high-definition camera and transmits it to the image processing unit for analysis. If defects still exist after the secondary image analysis, the leather defect position is marked with a marking pen. If there are no defects on the leather surface after the secondary image analysis, the leather is transmitted normally.

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