An optical film quality inspection apparatus

Abstract

The application relates to the technical field of thin film quality detection, and discloses an optical thin film quality detection device. The optical thin film quality detection device comprises a winding roller mechanism, a detection mechanism and a receiving roller assembly. The winding roller mechanism comprises a flattening roller assembly and the receiving roller assembly. The flattening roller assembly expands and transports a thin film to the receiving roller assembly. The detection mechanism is arranged between the flattening roller assembly and the receiving roller assembly and comprises an overall detection module and a local detection module. The application combines overall detection and local detection. The overall detection is used to obtain a defect position of the thin film, and then the local detection is used to detect a defect position area. The analysis process of the local detection can be operated offline. Therefore, the detection of the optical thin film focuses on a key area, and the offline fine analysis can be performed. The device can improve the detection efficiency while ensuring the detection precision.

Description

Technical Field

[0001] The present invention relates to the technical field of film quality detection, and in particular to an optical film quality detection device. Background Art

[0002] Optical thin films are thin-film materials that precisely control the behavior of light by precisely controlling their thickness and refractive index. They are widely used in optics, electronics, displays, energy, and other fields. Optical thin films are a vital component of modern optical technology, and their performance directly impacts the efficiency and precision of optical systems. With technological advancements, optical thin films are experiencing continuous breakthroughs in materials, preparation techniques, and applications, and will play a vital role in even more high-tech fields in the future.

[0003] Surface defect detection for optical films is critical for ensuring their optical performance, reliability, and application effectiveness. This inspection allows for the timely detection and resolution of defects, improving product quality, reducing production costs, and meeting the requirements of high-precision applications and industry standards. Existing film inspection technologies typically capture high-resolution images and conduct real-time analysis of the entire film surface during the flattening and conveying process. However, this approach requires significant real-time data processing, and due to the slow film conveyance speed, inspection speeds are also relatively slow. Furthermore, the inspection process only analyzes and processes the overall image, which can easily miss details. Summary of the Invention

[0004] The purpose of the present invention is to provide an optical film quality detection device to solve the above technical problems:

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An optical film quality detection device, comprising:

[0007] The winding roller mechanism includes a flattening roller assembly and a take-up roller assembly, wherein the flattening roller assembly unfolds and conveys the film toward the take-up roller assembly;

[0008] The detection mechanism is arranged between the flattening roller assembly and the take-up roller assembly, and includes an overall detection module and a local detection module; the overall detection module is used to collect and preliminarily analyze the overall image of the film and mark the film defect location based on the preliminary analysis result; the local detection module is used to collect the local image of the marked location of the film and identify and analyze the local image to determine the type of defect;

[0009] Operating table, used to support the roller mechanism and detection mechanism;

[0010] A control module, used for adjusting the conveying speed of the film according to the distribution of the marked positions of the film;

[0011] The interactive module is used to display the test results of the film quality. The test results include a local image of the defect location and the corresponding defect type.

[0012] As a further technical solution, the flattening roller assembly includes:

[0013] a first bracket, on which a first winding roller and a plurality of first guide rollers are mounted;

[0014] a first motor, mounted on the first bracket, and configured to drive the first roller to rotate;

[0015] The first electric slide rail is fixedly mounted on the upper end of the operating table. The first electric slide rail is slidably connected to a limit frame. An upper clamping plate and a lower clamping plate are slidably connected in the limit frame.

[0016] As a further technical solution, the upper end of the upper clamping plate is rotatably connected to a screw, and the screw is threadedly connected to the upper end of the limit frame; an electric push rod is fixedly installed in the limit frame, and the telescopic end of the electric push rod is fixedly connected to the lower end of the lower clamping plate.

[0017] As a further technical solution, the storage roller assembly includes:

[0018] a second bracket, fixedly mounted on the upper end of the operating table, wherein a second winding roller and a plurality of second guide rollers are mounted on the second bracket;

[0019] The second motor is fixedly mounted on the second bracket and is used to drive the second roller to rotate.

[0020] As a further technical solution, the overall detection module includes:

[0021] Two second electric slide rails are provided, and both second electric slide rails are vertically mounted on the upper end of the operating table and are respectively located on both sides of the unfolded film;

[0022] a movable beam, wherein both ends of the movable beam are slidably connected to the two second electric slide rails, and a first camera for capturing an entire image of the film is mounted on the movable beam;

[0023] a light bar, the light bar being arranged at the lower end of the unfolded film;

[0024] An analysis unit, used for preliminarily analyzing and locating the defect position of the film according to an edge detection algorithm;

[0025] The marking unit is used to mark the defect position of the film and record the coordinates of the defect position.

[0026] As a further technical solution, the local detection module includes:

[0027] A support column, the support column is fixedly mounted on the upper end of the operating table, and a third electric slide rail is fixedly mounted on the upper end of the support column;

[0028] a mounting block, the mounting block being slidably connected to the third electric slide rail, the second camera being fixedly mounted on the lower end of the mounting block;

[0029] A surface light source is arranged at the upper end of the operating table and below the third electric slide rail.

[0030] A control method for optical film quality detection equipment comprises the following steps:

[0031] Step 1: driving the first motor and the second motor to operate synchronously, and establishing a rectangular coordinate system with any point on the end edge of the film as the origin;

[0032] Step 2: Perform a preliminary analysis on the overall image of the film captured by the first camera to obtain the coordinates of the film defect location;

[0033] Step 3: determining the motion trajectory of the second camera along the third electric slide rail according to the film defect position coordinates and the film conveying speed;

[0034] Step 4: Calculate and analyze the coordinates of the positions of two adjacent film defects, and establish a film conveying speed adjustment strategy based on the calculation and analysis results.

[0035] As a further technical solution, the preliminary analysis process in step 2 includes:

[0036] Use filtering algorithms to remove noise from the overall image;

[0037] Enhance the image contrast by histogram equalization or contrast stretching and convert the image into a binary image;

[0038] The edge detection algorithm is used to detect the edges in the image and locate potential defects; the detected defect area is marked with a rectangular frame, and the center point of the rectangular frame is the coordinate point of the film defect position.

[0039] As a further technical solution, the process of calculating and analyzing the coordinates of two adjacent film defects includes:

[0040] In the rectangular coordinate system, the opposite direction of the film's transport direction is the positive direction of the x-axis;

[0041] The coordinates of the two adjacent film defects are as follows in the order of marking: 、 ;

[0042] like , then by the formula Calculate the required motion speed of the second camera ,in, is the conveying speed of the film;

[0043] The movement speed requirement value Motion speed threshold with the second camera For comparison:

[0044] like , then continue at speed conveying film;

[0045] like , then the second camera collects 、 In the process of corresponding local images, the film conveying is slowed down and the speed value is adjusted. Conveying film.

[0046] As a further technical solution, the process of calculating and analyzing the coordinates of two adjacent film defects also includes:

[0047] like , then the second camera collects 、 During the process of the corresponding partial image, the film conveying is paused for a period of .

[0048] Beneficial effects of the present invention:

[0049] This invention combines global and local inspection, detecting film defect locations through global inspection and then performing local inspection of the defect location area. The local inspection analysis process can be performed offline, focusing on key areas of optical films and enabling detailed offline analysis. This device improves inspection efficiency while maintaining accuracy. Furthermore, by capturing local images of defects, the problem of overlooking details during inspection is resolved. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The present invention will be further described below with reference to the accompanying drawings.

[0051] Figure 1 Schematic diagram of the three-dimensional structure of the optical film quality detection equipment of the present invention;

[0052] Figure 2 is a schematic diagram of the three-dimensional structure of the optical film quality inspection device of the present invention from another perspective;

[0053] Figure 3 for Figure 2 Schematic diagram of the local structure at A in the middle;

[0054] Figure 4It is a front view of the optical film quality inspection device of the present invention;

[0055] Figure 5 A top view of the optical film quality inspection device of the present invention;

[0056] Figure 6 This is a flow chart of the control method of the optical film quality detection equipment in the present invention.

[0057] Description of the drawings: 1. Operating table; 2. Rolling mechanism; 3. Detection mechanism; 4. Interaction module; 21. Flattening roller assembly; 22. Storage roller assembly; 31. Overall detection module; 32. Local detection module; 211. First bracket; 212. First rolling roller; 213. First guide roller; 215. First electric slide rail; 216. Limiting frame; 217. Upper clamping plate; 218. Lower clamping plate; 221. Second bracket; 222. Second rolling roller; 223. Second guide roller; 311. Second electric slide rail; 312. First camera; 313. Light bar; 321. Support column; 322. Third electric slide rail; 323. Mounting block; 324. Surface light source. DETAILED DESCRIPTION

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0059] See also Figure 1 、 2 As shown, an optical film quality detection device includes:

[0060] The winding mechanism is primarily responsible for unwinding, conveying, and collecting the film. It specifically comprises a flattening roller assembly 21 and a take-up roller assembly 22. The flattening roller assembly 21 unwinds and conveys the film toward the take-up roller assembly 22. The flattening roller assembly 21 ensures the film remains flat during conveyance, preventing wrinkles or uneven tension that could affect inspection accuracy. The take-up roller assembly 22 rewinds the inspected film for subsequent processing or storage.

[0061] The inspection mechanism 3, located between the flattening roller assembly 21 and the take-up roller assembly 22, comprises a global inspection module 31 and a local inspection module 32. The global inspection module 31 is used to capture and preliminarily analyze an overall image of the film and, based on the preliminary analysis results, mark the film defect locations. The local inspection module 32 is used to capture local images of the marked film locations and perform recognition and analysis on these images to determine the defect type. This recognition and analysis can be performed offline, without considering the impact of real-time performance on the inspection results. In summary, the global inspection module 31 is responsible for performing a global scan of the film to identify potential defect areas, while the local inspection module 32 performs high-precision inspection of the marked defect areas and further analyzes the defect type and severity. The global inspection module 31 typically utilizes a high-resolution camera and wide-angle lens, combined with image processing algorithms, to rapidly scan the film surface and identify potential defect areas. The local inspection module 32 is typically equipped with a high-magnification lens and a precision positioning system, enabling high-precision imaging of the marked defect areas. Image recognition algorithms, specifically convolutional neural networks, are used to perform image recognition and analysis, determining the defect type and severity.

[0062] An operating table 1, used to support the roller mechanism and the detection mechanism 3;

[0063] The control module is used to adjust the conveying speed of the film according to the distribution of the marked positions of the film. The control module can be equipped with a PLC or an industrial computer to realize the automatic operation of the equipment.

[0064] Interactive Module 4 displays film quality test results, including images of defect locations and corresponding defect types. Through Interactive Module 4, operators can view film quality test results in real time, including defect location, type, and severity. Furthermore, Interactive Module 4 can store test results in a database for subsequent analysis and quality traceability.

[0065] Through the above technical solution, this embodiment provides an optical film quality inspection device. Specifically, this embodiment combines overall inspection and local inspection of optical films. The overall inspection obtains the location of film defects. Although this process has real-time requirements, the amount of data processed is relatively small. Then, the defect location area is locally inspected. The analysis process of local inspection can be performed offline. Therefore, the inspection process focuses on key areas and can be analyzed offline in detail. The equipment can improve inspection efficiency while ensuring inspection accuracy. In addition, by capturing local images of defects, the problem of easily missing details during inspection is also solved. The real-time display and data storage functions of interactive module 4 provide strong support for quality management and process optimization.

[0066] See also Figure 3 、 4As shown, the flattening roller assembly 21 includes:

[0067] A first bracket 211 , on which a first winding roller 212 and a plurality of first guide rollers 213 are mounted;

[0068] a first motor, mounted on the first bracket 211 and configured to drive the first roller 212 to rotate;

[0069] The first electric slide rail 215 is fixedly mounted on the upper end of the operating platform 1 . A limit frame 216 is slidably connected to the first electric slide rail 215 . An upper clamping plate 217 and a lower clamping plate 218 are slidably connected inside the limit frame 216 .

[0070] Through the above technical solution, this embodiment provides the specific structural content of the flattening roller assembly 21, wherein the upper clamping plate 217 and the lower clamping plate 218 clamp the end of the film, and as the first winding roller 212 rotates, the limit frame 216 slides toward the storage roller assembly 22 on the first slide rail. This process can realize the detection of the film at the starting section of the film conveying.

[0071] See also Figure 3 As shown, the upper end of the upper clamping plate 217 is rotatably connected to a screw, and the screw is threadedly connected to the upper end of the limit frame 216. By rotating the screw, the height of the upper clamping plate 217 can be adjusted, and then the final clamping height can be adjusted; an electric push rod is fixedly installed in the limit frame 216, and the telescopic end of the electric push rod is fixedly connected to the lower end of the lower clamping plate 218. The lower clamping plate 218 is driven by the electric push rod to move upward in the limit frame 216, and cooperates with the upper clamping plate 217 to complete the clamping action of the film.

[0072] Through the above technical solution, this embodiment provides a driving method for the clamping action of the upper clamping plate 217 and the lower clamping plate 218, as well as a method for adjusting the clamping height.

[0073] See also Figure 4 As shown, the receiving roller assembly 22 includes:

[0074] The second bracket 221 is fixedly mounted on the upper end of the operating table 1. A second roller 222 and a plurality of second guide rollers 223 are mounted on the second bracket 221. The second motor is fixedly mounted on the second bracket 221 and is used to drive the second roller 222 to rotate. The second roller 222 is used to wind up the film after inspection. The second motor drives the second roller 222 to rotate, winding the inspected film from the inspection mechanism 3 onto the second roller 222. The second guide rollers 223 ensure that the film remains flat during the winding process to avoid wrinkles or deviation. The control module dynamically adjusts the speed of the second motor according to the conveying speed and tension of the film to ensure a smooth winding process.

[0075] Through the above technical solution, this embodiment provides the specific content of the storage roller assembly 22.

[0076] See also Figure 4 、 5 As shown, the overall detection module 31 includes:

[0077] There are two second electric slide rails 311, and both second electric slide rails 311 are vertically mounted on the upper end of the operating table 1 and are located on both sides of the unfolded film; the two ends of the movable beam are slidably connected to the two second electric slide rails 311, and the movable beam is equipped with a first camera 312 for capturing the entire image of the film; the movable beam can be made of lightweight and high-strength materials, such as carbon fiber or aluminum alloy, to reduce motion inertia and increase response speed. The beam design also needs to consider rigidity and stability to avoid vibration or deformation affecting the image acquisition quality. The main function of the second electric slide rail 311 is to support the movable beam and guide it to move in the vertical direction, so that the first camera 312 can cover the entire width of the film and capture a high-quality overall image.

[0078] The light bar 313 is provided at the lower end of the unfolded film and is used to provide uniform lighting to ensure that the first camera 312 can capture a clear image. Specifically, an LED light source can be used.

[0079] The analysis unit is used to perform preliminary analysis and locate film defects using edge detection algorithms. Image processing algorithms (such as Canny edge detection and the Sobel operator) employed by the analysis unit can identify edges and abnormal areas in film images. By comparing them with standard images, the analysis unit can quickly locate potential defect areas.

[0080] The marking unit is used to mark the defect position of the film and record the coordinates of the defect position. The marking process does not need to contact the film, and the marking process can only record the coordinates of the defect position.

[0081] Through the above technical solutions, this embodiment provides the structure and functions of the overall detection module 31.

[0082] See also Figure 4 、 5 As shown, the local detection module 32 includes:

[0083] A support column 321, the support column 321 is fixedly mounted on the upper end of the operating platform 1, and a third electric slide rail 322 is fixedly mounted on the upper end of the support column 321;

[0084] Mounting block 323 is slidably connected to the third electric rail. A second camera is fixedly mounted at its lower end. After determining the coordinates of the defect marking area, the second camera slides along the ground rail with mounting block 323. When the marked area moves below the third rail, the camera moves to the corresponding position and captures a partial image of the marked area. Offline analysis then feeds the partial image into a trained convolutional neural network, which outputs the defect type in the marked area.

[0085] Surface light source 324 typically employs an LED light source, which features high brightness, low power consumption, and a long lifespan. The LED light source's color temperature and brightness are adjustable to accommodate the inspection requirements of thin films of varying materials. Surface light source 324 is positioned at the upper end of operating table 1 and below third electric rail 322.

[0086] Through the above technical solutions, this embodiment provides the structure and corresponding functions of the local detection module 32.

[0087] See also Figure 6 As shown, a control method for optical film quality detection equipment includes the following steps:

[0088] Step 1. Drive the first motor and the second motor to operate synchronously: the first motor drives the first roller 212, and the second motor drives the second roller 222. The two motors need to operate synchronously to ensure uniform tension of the film during transportation to avoid stretching or wrinkling of the film. A rectangular coordinate system is established with any point on the end edge of the film as the origin. For example, the x-axis is the conveying direction of the film, and the y-axis is the width direction of the film.

[0089] Step 2: Perform a preliminary analysis of the overall film image captured by the first camera 312 to obtain the coordinates of the film defect location. The analysis unit processes the overall image using an edge detection algorithm (such as Canny edge detection or the Sobel operator) to identify defective areas on the film surface. By comparing it with a standard image, the analysis unit extracts defect features and calculates the coordinates of the defect in a rectangular coordinate system.

[0090] Step 3: According to the film defect position coordinates and the film conveying speed, the second camera's motion trajectory along the third electric slide 322 is established; the control module receives the defect position coordinates transmitted by the analysis unit and calculates the motion trajectory of the second camera in combination with the current film conveying speed. For example, if the defect is located at coordinates , the second camera needs to be on the film in a straight line When it is directly below the third electric slide rail 322, it moves to Local image acquisition is performed at the specified position.

[0091] Step four, calculate and analyze the coordinates of the defect positions of two adjacent films, and determine the film conveying speed adjustment strategy according to the calculation and analysis results.

[0092] Through the above technical solution, the embodiment provides a control method of the optical film quality detection equipment. By monitoring the defect distribution information in real time, the control module can flexibly adjust the detection strategy to ensure that the equipment can stably operate under different working conditions, thereby providing strong technical support for the quality control of the optical film.

[0093] The process of the preliminary analysis in step two includes:

[0094] A filtering algorithm is used to remove noise in the overall image, for example, for the collected overall image of the film, a Gaussian filter (kernel size of 5x5) is used to remove noise and retain the main texture and defect features of the film surface;

[0095] The image contrast is enhanced by histogram equalization or contrast stretching, and the image is converted into a binary image; the filtered image is processed by histogram equalization to make the contrast between the defect area and the background area of the film surface more obvious. The image with enhanced contrast is threshold segmented (threshold value is 128), and the defect area on the film surface is converted into white and the background area is converted into black

[0096] The edges in the image are detected by an edge detection algorithm to locate potential defects; the detected defect area is marked by a rectangular frame, and the center point of the rectangular frame is taken as the film defect position coordinate point. Through the above technical solution, the embodiment provides the process of preliminary analysis.

[0097] The process of calculating and analyzing the coordinates of the defect positions of two adjacent films includes:

[0098] The x-axis positive direction of the rectangular coordinate system is the opposite direction of the conveying direction of the film;

[0099] The coordinates of the defect positions of two adjacent films in the order of being marked are 、 ;

[0100] If , the motion speed requirement value of the second camera is calculated by the formula , wherein is the conveying speed of the film;

[0101] The motion speed requirement value is compared with the motion speed threshold value of the second camera :

[0102] If , the speed ​conveying film;

[0103] like , then the second camera collects 、 In the process of corresponding local images, the film conveying is slowed down and the speed value is adjusted. Conveying film.

[0104] The process of calculating and analyzing the coordinates of two adjacent film defects also includes:

[0105] like , then the second camera collects 、 During the process of the corresponding partial image, the film conveying is paused for a period of .

[0106] Through the above technical solution, this embodiment provides a process for calculating and analyzing the coordinates of two adjacent film defects. Specifically, first, the rectangular coordinate system takes the opposite direction of the film's transmission direction as the positive direction of the x-axis. The coordinates of the two adjacent film defects are marked in the order in which they are marked. 、 ;if This indicates that the two adjacent defects are collinear in the width direction of the film, so the second camera captures 、 During the process of corresponding partial images, the film conveying needs to be paused, and the pause time is , it can ensure that the second camera can capture the local images of the two defect areas. , then by the formula Calculate the required motion speed of the second camera ,in, is the conveying speed of the film. Motion speed threshold with the second camera For comparison: If , then continue at speed conveying film; if , then the second camera collects 、 In the process of corresponding local images, the film conveying is slowed down and the speed value is adjusted. Transport film. It should be noted that the movement speed threshold The empirical data is obtained by taking into account the time error of data transmission and analysis, not the maximum speed of the second camera movement. Therefore, the speed value is used The second camera can then capture partial images of the two defective areas.

[0107] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An optical film quality inspection device, characterized in that: include: A roller mechanism comprising a flattening roller assembly (21) and a take-up roller assembly (22), wherein the flattening roller assembly (21) unfolds and conveys the film toward the take-up roller assembly (22); The detection mechanism (3) is arranged between the flattening roller assembly (21) and the storage roller assembly (22), and includes an overall detection module (31) and a local detection module (32); the overall detection module (31) is used to collect and preliminarily analyze the overall image of the film, and mark the film defect position according to the preliminary analysis result; the local detection module (32) is used to collect the local image of the marked position of the film, and identify and analyze the local image to determine the type of defect; An operating table (1) for supporting a roller mechanism and a detection mechanism (3); A control module, used for adjusting the conveying speed of the film according to the distribution of the marked positions of the film; Interactive module (4), used for displaying the test results of film quality, the test results including the local image of the defect position and the corresponding defect type; The flattening roller assembly (21) comprises: a first bracket (211), wherein a first winding roller (212) and a plurality of first guide rollers (213) are mounted on the first bracket (211); a first motor, the first motor being mounted on the first bracket (211) and being used to drive the first roller (212) to rotate; A first electric slide rail (215) is fixedly mounted on the upper end of the operating table (1); a limit frame (216) is slidably connected to the first electric slide rail (215); an upper clamping plate (217) and a lower clamping plate (218) are slidably connected to the limit frame (216); The upper end of the upper clamping plate (217) is rotatably connected to a screw, and the screw is threadedly connected to the upper end of the limit frame (216); an electric push rod is fixedly installed in the limit frame (216), and the telescopic end of the electric push rod is fixedly connected to the lower end of the lower clamping plate (218); The receiving roller assembly (22) comprises: A second bracket (221) is fixedly mounted on the upper end of the operating table (1), and a second roller (222) and a plurality of second guide rollers (223) are mounted on the second bracket (221); a second motor, the second motor being fixedly mounted on the second bracket (221) and being used to drive the second roller (222) to rotate; The overall detection module (31) comprises: Two second electric slide rails (311) are provided, and the two second electric slide rails (311) are both vertically mounted on the upper end of the operating table (1) and are respectively located on both sides of the unfolded film; A movable beam, wherein both ends of the movable beam are respectively slidably connected to the two second electric slide rails (311), and a first camera (312) for collecting an entire image of the film is installed on the movable beam; a light bar (313), the light bar (313) being arranged at the lower end of the unfolded film; An analysis unit, used for preliminarily analyzing and locating the defect position of the film according to an edge detection algorithm; A marking unit, used to mark the defect position of the film and record the coordinates of the defect position; The local detection module (32) includes: A support column (321), the support column (321) is fixedly mounted on the upper end of the operating table (1), and a third electric slide rail (322) is fixedly mounted on the upper end of the support column (321); A mounting block (323), the mounting block (323) being slidably connected to the third electric slide rail (322), and a second camera being fixedly mounted on the lower end of the mounting block (323); a surface light source (324), the surface light source (324) being arranged at the upper end of the operating table (1) and located below the third electric slide rail (322); The control method of the optical film quality detection device comprises the following steps: Step 1: driving the first motor and the second motor to operate synchronously, and establishing a rectangular coordinate system with any point on the end edge of the film as the origin; Step 2: Performing a preliminary analysis on the overall image of the film captured by the first camera (312) to obtain the coordinates of the film defect position; Step 3: establishing a motion trajectory of the second camera along the third electric slide rail (322) according to the film defect position coordinates and the film conveying speed; Step 4: Calculate and analyze the coordinates of two adjacent film defect positions, and establish a film conveying speed adjustment strategy based on the calculation and analysis results; The process of calculating and analyzing the coordinates of two adjacent film defects includes: In the rectangular coordinate system, the opposite direction of the film's transport direction is the positive direction of the x-axis; The coordinates of the two adjacent film defects are as follows in the order of marking: 、 ; like , then by the formula Calculate the required motion speed of the second camera ,in, is the conveying speed of the film; The movement speed requirement value Motion speed threshold with the second camera For comparison: like , then continue at speed conveying film; like , then the second camera collects 、 In the process of corresponding local images, the film conveying is slowed down and the speed value is adjusted. Conveying film.

2. The optical film quality inspection device according to claim 1, characterized in that: The preliminary analysis process in step 2 includes: Use filtering algorithms to remove noise from the overall image; Enhance the image contrast by histogram equalization or contrast stretching and convert the image into a binary image; The edge detection algorithm is used to detect the edges in the image and locate potential defects; the detected defect area is marked with a rectangular frame, and the center point of the rectangular frame is the coordinate point of the film defect position.

3. The optical film quality inspection device according to claim 1, characterized in that: The process of calculating and analyzing the coordinates of two adjacent film defects also includes: like , then the second camera collects 、 During the process of the corresponding partial image, the film conveying is paused for a period of .

Images