Visual system evaluation method, device, system, electronic device and storage medium

Abstract

The present application discloses a method, device, system, electronic device and storage medium for evaluating a visual system, including: increasing the shooting frequency of the visual system according to the number of target images; shooting a preset standard film through the visual system to obtain a continuous multi-frame standard film image; and evaluating the accuracy of the visual system based on the multi-frame standard film image. By increasing the shooting frequency of the visual system, the number of pixel rows collected by the visual system increases compared to the original shooting of samples at the same distance. It can be considered that there is a good similarity between the continuous multi-row pixels, which provides conditional support for generating a sufficient number of repetitive images using the collected multi-row pixel lines. The standard film is pasted on the material strip to be tested, and a corresponding number of repetitive test data can be generated under normal production conditions to evaluate the accuracy of the visual system.

Description

Technical Field

[0001] The present application relates to the field of measurement technology, and in particular to an evaluation method, device, system, electronic device and storage medium for a visual system. Background Art

[0002] At present, in the material conveying equipment using the line scan camera system, since the material belt needs to be moved and transmitted at a certain speed to ensure the normal production conditions, the line scan camera system cannot obtain effective repeatable test data, and thus cannot evaluate the accuracy of the line scan camera system.

[0003] Taking the transmission of battery electrodes as an example, it is necessary to obtain multiple repeated images at the same position of the battery electrode, so as to obtain the measurement value of the battery electrode based on the multiple repeated images to ensure the measurement accuracy. However, the battery electrode is constantly moving forward for transmission, and the line scan camera system cannot obtain multiple repeated images at the same position. Moreover, if the battery electrode is stopped, it will affect the normal production speed.

[0004] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Summary of the invention

[0005] In view of the above problems, the present application proposes a method, device, system, electronic device and storage medium for evaluating a visual system to solve the problem in the prior art that effective repeatable test data cannot be obtained and the visual system cannot be accurately evaluated.

[0006] A first aspect of the present application provides an evaluation method of a visual system, wherein the visual system is used to detect a material strip to be tested, and the method comprises:

[0007] According to the number of target images, increase the shooting frequency of the visual system, where the shooting frequency is the number of acquisitions per unit time;

[0008] The preset standard film is photographed by the visual system to obtain a continuous multi-frame standard film image; the standard film is consistent with the shape of the measured material strip;

[0009] The accuracy of the visual system is evaluated based on the multiple frames of standard film images.

[0010] In the technical solution of the embodiment of the present application, by increasing the shooting frequency of the visual system according to the number of target images, the number of pixel rows collected by the visual system increases compared to the original sample taken at the same distance, thereby reducing the physical size of a single pixel. In this way, it can be considered that there is good similarity between multiple consecutive rows of pixels, and the number of pixel rows used to generate the image is fixed, which provides conditional support for generating a sufficient number of repeatable test data using the collected multiple rows of pixel lines. Therefore, when the preset standard film moves with the measured material belt, based on the multi-frame standard film images collected by the visual system, a corresponding number of repeatable test data can be generated under normal production conditions to evaluate the accuracy of the visual system.

[0011] In some embodiments, increasing the shooting frequency of the visual system according to the number of target images includes:

[0012] The increase multiple of the shooting frequency is determined according to the number of target images; and the shooting frequency of the visual system is adjusted according to the increase multiple.

[0013] In this embodiment, by determining the increase multiple of the shooting frequency according to the number of target images, it can be ensured that the number of pixel rows captured by the visual system increases by a corresponding multiple compared to the original acquisition, which is conducive to the subsequent generation of a sufficient number of repeated images.

[0014] In some embodiments, the step of evaluating the accuracy of the visual system based on the multiple frames of standard film images includes:

[0015] Based on the multiple frames of standard film images, generating the target number of repeated images;

[0016] The accuracy of the vision system is evaluated based on the number of repeated images of the target image.

[0017] In this embodiment, a target number of repeated images are generated from multiple frames of standard film images as effective repeatability test data, so that the accuracy of the visual system can be accurately evaluated based on the repeatability test data.

[0018] In some embodiments, generating the target number of repeated images based on the multiple frames of standard film images includes:

[0019] Obtain a target number of standard film images required to generate one frame of repeated images; extract standard film images in the plurality of frames of standard film images in a manner of spacing the number of rows of the target number of images to obtain the target number of groups of standard film images, each group of standard film images containing the target number of standard film images; and use each group of standard film images to generate one frame of repeated images.

[0020] In this embodiment, a target number of groups of standard film images are obtained by extracting from multiple frames of standard film images at intervals of a certain number of lines. This ensures that the similarity between the images generated in each group is high enough, thereby improving the repeatability between the images.

[0021] In some embodiments, the step of generating one frame of repeated images using each set of standard film images includes:

[0022] Each group of standard film images is spliced ​​into one frame of initial image; the physical size of the pixels in each frame of initial image is increased by a target multiple to obtain a corresponding repeated image, wherein the target multiple is the increase multiple of the shooting frequency.

[0023] In this embodiment, after each group of standard film images are spliced ​​to generate one frame of image, the physical size of the pixels in the image is increased according to the increase multiple of the shooting frequency to keep consistent with the original production size.

[0024] In some embodiments, evaluating the accuracy of the visual system based on the number of repeated images of the target image includes:

[0025] Determine the measurement value of the standard film according to the repeated images of the target image quantity; and evaluate the accuracy of the visual system by using the measurement value and the standard value of the standard film obtained in advance.

[0026] In this embodiment, by using a certain number of repeated images to determine the measurement value of the standard film, the reliability and similarity of the test results can be improved, so that the accuracy of the system can be effectively evaluated using the measurement value and standard value of the standard film.

[0027] In some embodiments, before evaluating the accuracy of the visual system using the measured value and the pre-obtained standard value of the standard film, the method further includes:

[0028] The elongation rates of the measured material strip and the standard sheet under the same tension are obtained; and the standard value of the standard sheet is obtained by using the elongation rate of the measured material strip, the elongation rate of the standard sheet and the measured value of the standard sheet under no tension.

[0029] In this embodiment, when obtaining the standard value of the standard piece, it is considered that the stretch rates of the measured material strip and the standard piece under a certain tension during movement are inconsistent, which affects the accuracy evaluation. Therefore, the stretch rates of the measured material strip and the standard piece under equivalent tension are obtained, and the standard value of the standard piece is obtained by using their respective stretch rates and the high-precision measurement values ​​of the standard piece under no tension, so as to align the standard piece with the measured material strip and eliminate the impact of the inconsistent stretch rates of the two.

[0030] The second aspect of the present application proposes an evaluation system for a visual system, comprising: a visual system, a standard film, a material strip to be measured, and a controller, wherein the standard film is consistent in shape with the material strip to be measured, the standard film is pasted on the material strip to be measured, and the controller is connected to the visual system; the controller is used to execute the method described in the first aspect.

[0031] In some embodiments, when the material strip to be measured is a battery electrode, the battery electrode includes a coating area and a blank area; a plurality of first areas and a plurality of second areas are provided on the standard sheet, and the plurality of first areas and the plurality of second areas are arranged in sequence at intervals on the standard sheet; the width and grayscale of the first area are consistent with the width and grayscale of the coating area, and the width and grayscale of the second area are consistent with the width and grayscale of the blank area.

[0032] The third aspect of the present application provides an evaluation device for a visual system, the device comprising:

[0033] A line frequency adjustment module, used to increase the shooting frequency of the visual system according to the number of target images, where the shooting frequency is the number of acquisitions per unit time;

[0034] An acquisition module is used to shoot a preset standard film through the visual system to obtain a continuous multi-frame standard film image; the standard film is consistent with the shape of the measured material strip;

[0035] An evaluation module is used to evaluate the accuracy of the visual system based on the multiple frames of standard film images.

[0036] The fourth aspect of the present application proposes an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the first aspect when executing the program.

[0037] The fifth aspect of the present application proposes a computer-readable storage medium having a computer program stored thereon, characterized in that when the program is executed by a processor, the steps of the method described in the first aspect are implemented.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0040] Figure 1 is a schematic diagram of an evaluation system of a visual system according to an exemplary embodiment;

[0041] Figure 2 is a schematic diagram of a standard sheet design corresponding to a battery electrode sheet according to an exemplary embodiment;

[0042] Figure 3 is a flow chart of a method for evaluating a visual system according to an exemplary embodiment;

[0043] Figure 4 A schematic diagram of a repeated image acquisition principle of a visual system according to an exemplary embodiment is shown;

[0044] Figure 5 is a schematic structural diagram of an evaluation device for a visual system according to an exemplary embodiment;

[0045] Figure 6 is a schematic diagram of a hardware structure of an electronic device according to an exemplary embodiment;

[0046] Figure 7 The figure is a schematic diagram of the structure of a storage medium according to an exemplary embodiment. DETAILED DESCRIPTION

[0047] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0049] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0050] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] At present, a line scan camera system is usually used to measure the size of the material strip on the material strip production line. Because the material strip needs to be moved and transmitted at a certain speed under normal production conditions, the line scan camera system cannot obtain repeatable measurement data, and thus cannot guarantee the reliability and stability of the measurement results, resulting in an inability to effectively evaluate the accuracy and precision of the system.

[0056] In order to solve the above technical problems, the present application proposes an evaluation scheme for a visual system, which increases the shooting frequency of the visual system according to the number of target images, so that the number of pixel rows collected by the visual system increases compared with the original sample at the same distance, thereby reducing the physical size of a single pixel. In this way, it can be considered that there is a good similarity between multiple consecutive rows of pixels, and the number of pixel rows used to generate the image is fixed, which provides conditional support for obtaining a sufficient number of repetitive images. Therefore, the standard film is pasted on the material belt to be tested, and during the process of moving and transmitting the material belt to be tested under normal production conditions, multiple frames of standard film images are collected through the visual system, and a corresponding number of repeated images are generated as effective repeatability test data, which is used to evaluate the accuracy of the visual system and improve the repeatability and stability of the system.

[0057] The material strips detected by the visual system in the evaluation scheme of the visual system disclosed in the embodiment of the present application can be, but are not limited to, battery pole pieces in the battery product field, and can also be material strips in other product fields, such as fabric strips in the textile field, so as to monitor and improve the product quality during the production process.

[0058] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0059] Figure 1 It is a schematic diagram of an evaluation system of a visual system according to an exemplary embodiment, comprising: a visual system 10, a standard film 20, a material strip 50 to be measured, and a controller 40. The standard film 20 and the material strip 50 to be measured have the same shape, and the controller 40 is connected to the visual system 10.

[0060] The material strip 50 to be measured can be understood as an intermediate product produced on a battery production line. During the moving and transporting process, the material strip 50 to be measured needs to be monitored for dimensions using a visual system.

[0061] The standard film 20 can be understood as a profiling piece used to align with the material strip 50 to be measured. Therefore, the standard film 20 is consistent in shape with the material strip 50 to ensure that the standard film 20 can be aligned with the material strip 50 to be measured and then attached to the material strip 50 to be measured. During the normal movement and transmission of the material strip 50 to be measured, the standard film 20 can be moved together, so that the visual system 10 can collect data of the standard film image.

[0062] The visual system 10 can be understood as a line scan camera system, including a line array camera 110 and a system light source 120. The line array camera 110 can be located on the left or right side of the measured material strip 50, and collects pixel lines in a line-by-line scanning manner. The system light source 120 is located above the measured material strip 50. It can be seen that the standard film image collected by the visual system each time is a line of pixel lines, which is represented by a line of pixels.

[0063] The controller 40 can control the shooting frequency of the visual system 10 to collect pixel lines, and store the collected pixel lines and synthesize a complete image. The shooting frequency is the number of times collected per unit time.

[0064] When implementing the evaluation of the line array camera system 10, the controller 40 increases the shooting frequency of the visual system 10 according to the number of target images, and shoots the preset standard film 20 through the visual system 10 to obtain continuous multi-frame standard film images, and then evaluates the accuracy of the visual system 10 based on the collected multi-frame standard film images.

[0065] It should be noted here that the direction in which the visual system 10 collects pixel lines is perpendicular to the moving direction of the material strip 50 being measured.

[0066] By applying the embodiment of the present application, by increasing the shooting frequency of the visual system, the number of pixel rows collected by the visual system increases compared to the original sample taken at the same distance, thereby reducing the physical size of a single pixel. In this way, it can be considered that there is good similarity between multiple consecutive rows of pixels, and the number of pixel rows used to generate the image is fixed, which provides conditional support for using the collected multiple rows of pixel lines to generate a sufficient number of repetitive images. Therefore, during the movement of the measured material belt with the standard film attached, based on the multiple frames of standard film images collected by the visual system, a corresponding number of effective repeatability test data can be obtained under normal production conditions to evaluate the accuracy of the visual system.

[0067] In some embodiments, see Figure 2 As shown, in the case where the measured material strip 50 is a battery electrode, since the battery electrode includes a coating area and a blank area, a plurality of first areas 210 and a plurality of second areas 220 can be provided on the standard sheet 20, and the plurality of first areas 210 and the plurality of second areas 220 are arranged in sequence on the standard sheet 20 at intervals, and the width and grayscale of the first area 210 are consistent with the width and grayscale of the coating area, and the width and grayscale of the second area 220 are consistent with the width and grayscale of the blank area, so as to ensure that the linear array camera system can collect imaging grayscale consistent with the battery electrode, so as to facilitate the use of the same measurement algorithm to obtain the measurement value of the standard sheet.

[0068] The first area 210 corresponds to the coating area on the battery pole piece, and the second area 220 corresponds to the blank area on the battery pole piece. Usually, the linear array camera system 10 needs to monitor the length and / or width of the coating area on the battery pole piece and the length and / or width of the blank area. Therefore, the measurement value of the standard sheet may include the length and / or width of the first area 210 and the length and / or width of the second area 220.

[0069] It is worth noting here that if the battery electrode includes an insulating area in addition to the coating area and the blank area, the insulating area is located between the coating area and the blank area. Accordingly, a third area can be set on the standard plate between the first area and the second area, and the width and grayscale of the third area are consistent with the width and grayscale of the insulating area.

[0070] Figure 3 is a flow chart of a method for evaluating a visual system according to an exemplary embodiment. Figure 1 Based on the visual system evaluation system shown in the figure, the visual system evaluation method includes the following steps:

[0071] Step 301: increasing the shooting frequency of the visual system according to the number of target images;

[0072] Step 302: photographing a preset standard film through a visual system to obtain a continuous plurality of frames of standard film images;

[0073] Step 303: Evaluate the accuracy of the visual system based on the multiple frames of standard film images.

[0074] The target number of images can be understood as the number of repetitive data to be obtained according to actual needs, such as 3-5 data, which means that the visual system is required to provide 3-5 images for evaluating the linear array camera system.

[0075] The shooting frequency can be understood as the frequency at which the visual system collects pixel lines, which represents the number of collections per unit time, for example 2500 lines / second.

[0076] A standard film image can be understood as a row of pixel data obtained by a visual system when it is photographed once. Therefore, one frame of a standard film image is represented by a row of pixels, for example, 1*1800.

[0077] It should be understood that in the existing solution, the visual system uses an internally set default shooting frequency to shoot samples to obtain pixel lines and store them, and a certain number of pixel lines obtained by continuous shooting are used to synthesize one frame of image.

[0078] The present application uses an increased shooting frequency to collect pixel lines. Compared with the existing method of shooting samples at the same distance, the number of pixel rows collected increases and the physical size of a single pixel decreases. It can be considered that there are certain similarities between the multiple rows of pixel lines collected continuously, and the number of pixel rows used to generate the image is fixed. Therefore, the multiple frames of images generated by the multiple rows of pixel lines obtained by shooting samples at the same distance can be considered as repeated images of the same position of the sample.

[0079] It is worth noting here that the physical size of a single pixel refers to the actual object size represented by a single pixel in the image. As the shooting frequency increases, the size of the actual object represented by a single pixel will become smaller due to the increase in the number of rows collected by the visual system.

[0080] For example, during the movement of the sample, assuming that the default shooting frequency is currently used to shoot samples at a certain distance to obtain 2500 lines of pixel lines to synthesize one frame of image, the present application uses an increased shooting frequency to shoot samples at the same distance to obtain 5000 lines of pixel lines, so that the two frames of images synthesized by 5000 lines of pixel lines can be considered to be repeated images of the same position of the sample.

[0081] When shooting the preset standard film through the visual system, the shooting can be ended in the same way as the original control. This application does not make specific restrictions on this. For example, the control ends according to a certain shooting time, or according to the transmission distance of the measured material belt.

[0082] It can be seen from this that the above-mentioned multiple frames of standard film images can be understood as pixel data obtained by the shooting time required to generate one frame of image.

[0083] At this point, the above Figure 3 The evaluation process of the visual system shown in the figure increases the shooting frequency of the visual system according to the number of target images, so that the number of pixel rows collected by the visual system increases compared with the original sample at the same distance, thereby reducing the physical size of a single pixel. In this way, it can be considered that there is a good similarity between multiple consecutive rows of pixels, and the number of pixel rows used to generate the image is fixed, which provides conditional support for using the collected multiple rows of pixels to generate a sufficient number of repeatable images. Therefore, in the process of the preset standard film following the movement of the measured material belt, based on the multi-frame standard film images collected by the visual system, a corresponding number of effective repeatability test data can be generated under normal production conditions to evaluate the accuracy of the visual system.

[0084] In some embodiments, the above step 301 may include:

[0085] The increase factor of the shooting frequency is determined according to the number of images, and then the shooting frequency of the visual system is adjusted according to the increase factor.

[0086] The amplification factor is positively correlated with the number of target images, that is, the more target images there are, the higher the amplification factor is.

[0087] Exemplarily, assuming that the number of target images required is 3, the increase factor is 3, thereby increasing the shooting frequency of the visual system to 3 times the default shooting frequency.

[0088] Furthermore, if the shooting frequency is increased to 3 times of the original, the physical size of the original single pixel will be reduced to 1 / 3 of the original.

[0089] In this embodiment, by determining the increase multiple of the shooting frequency according to the number of target images, it can be ensured that the number of pixel rows captured by the visual system increases by a corresponding multiple compared to the original acquisition, which is conducive to the subsequent generation of a sufficient number of repeated images.

[0090] In some embodiments, the above step 302 may include:

[0091] Based on multiple frames of standard film images, a target number of repeated images are generated, and the accuracy of the visual system is evaluated based on the target number of repeated images.

[0092] The repeated image can be understood as two-dimensional pixel data synthesized by a certain number of pixel lines. For example, if the size of the repeated image is 2500*1800, it means that it is composed of 2500 lines of pixel lines. It should be noted that one frame of repeated image is generated by some pixel lines in multiple frames of standard film images.

[0093] In this embodiment, a target number of repeated images are generated from multiple frames of standard film images as effective repeatability test data, so that the accuracy of the visual system can be accurately evaluated based on the repeatability test data.

[0094] In some embodiments, the process of generating a target number of repeated images based on multiple frames of standard film images may include:

[0095] A target number of standard film images required to generate one frame of repeated images is obtained. Among multiple frames of standard film images, standard film images are extracted in a manner of the number of rows spaced by the target number of images to obtain a target number of groups of standard film images, each group of standard film images containing the target number of standard film images, and one frame of repeated images is generated using each group of standard film images.

[0096] The target number refers to the number of pixel lines required for one frame of repeated images (i.e., the number of standard film images). The target number can be the number of pixel lines used when synthesizing images in an existing scheme, or can be obtained by dividing the total number of multiple frames of standard film images by the target number of images.

[0097] For example, assuming that the number of target images is 2 and the total number of multi-frame standard film images is 5000, the target number of standard film images required to obtain one frame of repeated image is 2500 rows.

[0098] It should be noted here that extracting the standard film images in the manner of the number of rows of the target image interval can ensure that the similarity of the generated repeated images is high enough. Assuming that the shooting frequency is increased by 3 times, that is, the total number of pixel lines of the samples at the same distance is increased to 3 times the original, then the physical size of a single pixel is reduced to 1 / 3 of the original. If the physical size of a single pixel is reduced to a small enough size at this time, it can be considered that the similarity of 3 consecutive rows of pixel lines is high enough, so the grouping is extracted by 3 rows of pixel lines, which can ensure that the similarity of the generated 3 frames of images is high enough.

[0099] For example, assuming that the number of target images is 3, the 6 rows of standard film images are numbered 1, 2, 3, 4, 5, 6 according to the shooting time, and grouped by 3 rows, 3 groups of standard film images can be obtained: 1, 4; 2, 5; 3, 6.

[0100] In this embodiment, a target number of groups of standard film images are obtained by extracting from multiple frames of standard film images at intervals of a certain number of lines. This ensures that the similarity between the images generated in each group is high enough, thereby improving the repeatability between the images.

[0101] It should be noted that, in addition to the above-mentioned interlaced extraction method for grouping standard slice images, continuously acquired pixel lines can also be divided into one group to ensure the continuity between pixel lines.

[0102] In some embodiments, the process of using each group of standard film images to generate one frame of repeated images may include:

[0103] Each group of standard film images is spliced ​​into one frame of initial image, and the physical size of the pixels in each frame of initial image is increased by a target multiple to obtain a corresponding repeated image. The target multiple is the increase multiple of the shooting frequency.

[0104] The initial image can be understood as an image formed by stitching together a group of standard film images in order of shooting time from early to late.

[0105] The target multiple is the increase multiple of the visual system's shooting frequency. As mentioned above, when the shooting frequency is increased by 3 times, the physical size of a single pixel is reduced to 1 / 3 of the original. In order to restore the actual object size represented by a single pixel to the size before the shooting frequency was increased, the physical size of the pixel in the initial image needs to be increased by the increase multiple of the shooting frequency to keep it consistent with the original production size.

[0106] It should be noted that when adjusting the physical size of a single pixel, only the size of the measured material strip in the moving direction can be adjusted, because the increase in shooting frequency affects the actual object size represented by a single pixel only the size of the measured material strip in the moving direction.

[0107] It is understandable that the adjustment of the physical size affects the calculation of subsequent measurement values, but does not affect the image size, that is, the number of pixels in the image does not change.

[0108] In this embodiment, after each group of standard film images are spliced ​​to generate one frame of image, the physical size of the pixels in the image is increased according to the increase multiple of the shooting frequency to keep consistent with the original production size.

[0109] In some embodiments, the process of evaluating the accuracy of the vision system for a number of repeated images based on a target image may include:

[0110] Based on the repeated images of the target image quantity, the measurement value of the standard film is determined, and then the accuracy of the visual system is evaluated using the measured value and the standard value of the standard film obtained in advance.

[0111] The measured value may be understood as standard sheet size data measured based on repeated images, which may include a width measurement value and / or a length measurement value of the standard sheet.

[0112] The standard value may be understood as standard size data of the standard sheet. Corresponding to the type of the measurement value of the standard sheet to be measured, the standard value may include a standard value for width and / or a standard value for length of the standard sheet.

[0113] Exemplarily, in the case where the material strip being measured is a battery electrode, the battery electrode includes a coating area and a blank area, and the measurement value of the standard sheet includes the width measurement value and / or length measurement value of the first area corresponding to the coating area, and the width measurement value and / or length measurement value of the second area corresponding to the blank area; the standard value of the standard sheet includes the standard width value and / or standard length value of the first area corresponding to the coating area, and the standard width value and / or standard length value of the second area corresponding to the blank area.

[0114] When determining the measurement value of the standard film according to the repeated images of the target image quantity, the measurement value of the standard film in each frame of the repeated image can be obtained first, and then the average value of the measurement values ​​of each frame of the repeated image is used as the final measurement value of the standard film.

[0115] When obtaining the measurement value of the standard film in each frame of repeated images, the edge is patrolled in the repeated images according to the imaging grayscale difference, and then the measurement value is obtained by the number of pixels between the two edges and the physical size of a single pixel. For example, assuming that the measurement value is the length, the edge is patrolled along the moving direction of the measured material strip in the repeated images according to the imaging grayscale difference, and then the product of the number of pixels between the two edges and the physical size of a single pixel is calculated to obtain the length measurement value.

[0116] When evaluating the accuracy of a visual system using measured values ​​and standard values ​​of pre-obtained standard films, the ratio of the difference between the measured value and the standard value to the standard value can be calculated as the accuracy of the visual system.

[0117] Furthermore, the visual system may be calibrated according to the evaluated accuracy to improve the measurement accuracy of the visual system.

[0118] In this embodiment, by using a certain number of repeated images to determine the measurement value of the standard film, the reliability and similarity of the test results can be improved, so that the accuracy of the system can be effectively evaluated using the measurement value and standard value of the standard film.

[0119] In some embodiments, before evaluating the accuracy of the visual system using the measured values ​​and the standard values ​​of the pre-acquired standard film, the following steps may also be included:

[0120] The elongation rates of the measured material strip and the standard sheet under the same tension are obtained, and the standard value of the standard sheet is obtained by using the elongation rate of the measured material strip, the elongation rate of the standard sheet and the measured value of the standard sheet under no tension.

[0121] The stretch rate can be understood as the extension degree of an object under certain tension conditions. Since the material belt transmission equipment usually includes a rotating roller and a pressing roller, in the actual working process, the pressing roller and the rotating roller are pressed against each other to achieve the compression of the material belt, and then the material belt is conveyed by the rotation of the rotating roller. In this way, the material belt will be subjected to a certain tension during the conveying process. This tension mainly comes from the moving direction, so that the material belt will have a certain extension in the moving direction, and the size will change relative to the tension-free condition. Therefore, the elongation rate of the material belt needs to be considered when evaluating the accuracy of the visual system. Since the material of the measured material belt and the standard sheet are different, the extension degree of the standard sheet when it moves and transmits with the measured material belt on the material belt transmission equipment is different from that of the measured material belt, so it is necessary to obtain the stretch rates of the two separately.

[0122] When obtaining the respective stretch rates of the measured material strip and the standard sheet under the same tension, the test can be obtained by building a test platform. Specifically, two sets of weights equivalent to the transmission tension are used, and the two ends of the standard sheet are respectively connected to the pressure seam of a weight and tightened to fix, and then the standard sheet is placed on the sliding rods at both ends of the test platform so that the standard sheet is subjected to uniform tension. The size of the standard sheet is measured using a high-precision measuring instrument to obtain the measurement value of the standard sheet under tension, and then the stretch rate of the standard sheet can be obtained based on the measurement value under tension and the measurement value under no tension. The process of obtaining the stretch rate of the measured material strip is the same as that of the standard sheet, so it will not be repeated.

[0123] The measured value of the standard sheet in the tension-free condition can be understood as the dimensional data measured by a high-precision measuring instrument when the standard sheet is laid flat.

[0124] The standard value of the standard sheet can be understood as the standard size data of the standard sheet under tension.

[0125] Using the stretch rate of the measured material strip, the stretch rate of the standard sheet, and the measured value of the standard sheet under no tension, the calculation formula for obtaining the standard value of the standard sheet can be shown as follows:

[0126]

[0127] In the above formula, Indicates the elongation of the standard sheet, Indicates the elongation of the measured material strip. Indicates the measured value of the standard piece under no tension.

[0128] It can be seen from the above formula that since the standard sheet is pasted on the measured material strip and moved together, the stretch rate of the measured material strip and the stretch rate of the standard sheet affect each other. The standard value of the standard sheet needs to take the stretch rate of the measured material strip into account. Therefore, the standard value of the standard sheet is obtained by combining the calculation model of the stretch rate of the measured material strip and the stretch rate of the standard sheet.

[0129] In this embodiment, when obtaining the standard value of the standard piece, it is considered that the stretch rates of the measured material strip and the standard piece under a certain tension during movement are inconsistent, which affects the accuracy evaluation. Therefore, the stretch rates of the measured material strip and the standard piece under equivalent tension are obtained, and the standard value of the standard piece is obtained by using their respective stretch rates and the high-precision measurement values ​​of the standard piece under no tension, so as to align the standard piece with the measured material strip and eliminate the impact of the inconsistent stretch rates of the two.

[0130] With respect to the technical solutions provided in the above embodiments, Figure 4This is a schematic diagram of a repeated image acquisition principle of a visual system according to an exemplary embodiment. It is assumed that the number of pixel lines used by the visual system to construct a two-dimensional image is 2 lines. In the original scheme, a 12 mm sample is photographed using the default shooting frequency, the MD direction is the sample movement direction, the TD direction is the pixel line acquisition direction, the first section of the sample corresponds to a line of pixel lines, and the second section of the sample corresponds to a line of pixel lines.

[0131] After increasing the default shooting frequency by 3 times, the sample with the same distance of 12mm is shot. Figure 4 It can be seen from the square bars in the second column that the original first section of samples corresponds to 3 rows of pixel lines (marked 1 in the figure corresponds to the first row of pixel lines, marked 2 corresponds to the second row of pixel lines, and marked 3 corresponds to the third row of pixel lines), and the original second section of samples corresponds to 3 rows of pixel lines (marked 4 in the figure corresponds to the fourth row of pixel lines, marked 5 corresponds to the fifth row of pixel lines, and marked 6 corresponds to the sixth row of pixel lines). Then, the rows are extracted according to the marks with an interval of 3 rows of pixel lines. The 2 rows of pixel lines marked 1 and 4 are spliced ​​to obtain 1 frame of two-dimensional image, the 2 rows of pixel lines marked 2 and 5 are spliced ​​to obtain 1 frame of two-dimensional image, and the 2 rows of pixel lines marked 3 and 6 are spliced ​​to obtain 1 frame of two-dimensional image, which is the initial image.

[0132] Since the number of pixel lines for shooting samples at the same distance increases to 3 times the original number, the actual object size (i.e., physical size) represented by a single pixel in the MD direction is reduced to 1 / 3 of the original number, that is, the first pixel line corresponding to mark 1 represents a 2mm sample, the second pixel line corresponding to mark 2 represents a 2mm sample, and the third pixel line corresponding to mark 3 represents a 2mm sample, which is equivalent to splitting the 6mm sample represented by the original one pixel line into three pixel lines. If the actual object size represented by a single pixel in the MD direction is small enough at this time, it can be considered that the similarity of the three consecutive pixel lines is high enough, so the lines can be sequentially spliced ​​with three pixel lines at intervals to form three frames of initial images.

[0133] In order to restore the actual object size represented by a single pixel to its original state, the actual object size represented by a single pixel in the MD direction of the initial image is increased by 3 times to keep consistent with the original, thereby forming 3 frames of repeated images. The pixel lines corresponding to marks 1, 2, and 3 represent the original first-segment samples, and marks 4, 5, and 6 represent the original second-segment samples.

[0134] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0135] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0136] Corresponding to the above-mentioned embodiment of the visual system evaluation method, the present application also provides an embodiment of the visual system evaluation device.

[0137] Figure 5 FIG. 1 is a schematic diagram of a structure of a visual system evaluation device according to an exemplary embodiment of the present application. The device is used to execute the visual system evaluation method provided in any of the above embodiments, such as Figure 5 As shown, the evaluation device of the visual system includes:

[0138] A line frequency adjustment module 510, used to increase the shooting frequency of the visual system according to the number of target images, where the shooting frequency is the number of acquisitions per unit time;

[0139] The acquisition module 520 is used to shoot a preset standard film through the visual system to obtain a continuous multi-frame standard film image; the standard film is consistent with the shape of the measured material strip;

[0140] The evaluation module 530 is used to evaluate the accuracy of the visual system based on the multiple frames of standard film images.

[0141] The implementation process of the functions and effects of each unit in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned method, and will not be repeated here.

[0142] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present application scheme. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0143] The embodiment of the present application also provides an electronic device corresponding to the visual system evaluation method provided in the above embodiment, so as to execute the above visual system evaluation method.

[0144] Figure 6This is a hardware structure diagram of an electronic device according to an exemplary embodiment of the present application, and the electronic device may include: a communication interface 601, a processor 602, a memory 603 and a bus 604; wherein the communication interface 601, the processor 602 and the memory 603 communicate with each other through the bus 604. The processor 602 can execute the visual system evaluation method described above by reading and executing the machine executable instructions corresponding to the control logic of the visual system evaluation method in the memory 603. The specific content of the method is referred to the above embodiment, and will not be repeated here.

[0145] The memory 603 mentioned in this application can be any electronic, magnetic, optical or other physical storage device, and can contain storage information, such as executable instructions, data, etc. Specifically, the memory 603 can be RAM (Random Access Memory), flash memory, storage drive (such as hard disk drive), any type of storage disk (such as optical disk, DVD, etc.), or similar storage medium, or a combination thereof. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 601 (which can be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. can be used.

[0146] The bus 604 may be an ISA bus, a PCI bus or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 603 is used to store programs, and the processor 602 executes the programs after receiving execution instructions.

[0147] The processor 602 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 602. The above processor 602 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor can be combined and executed.

[0148] The electronic device provided in the embodiment of the present application and the visual system evaluation method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, operated or implemented therein.

[0149] The present application also provides a computer-readable storage medium corresponding to the visual system evaluation method provided in the above embodiment. Figure 7 As shown, the computer-readable storage medium shown is a CD 30 on which a computer program (ie, a program product) is stored. When the computer program is run by a processor, the visual system evaluation method provided by any of the aforementioned embodiments will be executed.

[0150] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0151] The computer-readable storage medium provided in the above-mentioned embodiments of the present application and the visual system evaluation method provided in the embodiments of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the application programs stored therein.

[0152] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0153] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0154] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for evaluating a visual system, wherein the visual system is used to detect a material strip to be tested, characterized in that: The method comprises: According to the number of target images, increase the shooting frequency of the visual system, where the shooting frequency is the number of acquisitions per unit time; During the transmission of the material strip to be measured, the standard film attached to the material strip to be measured is photographed by the visual system to obtain a continuous multi-frame standard film image; the standard film is consistent with the shape of the material strip to be measured; Based on the multiple frames of standard film images, evaluating the accuracy of the visual system; The step of evaluating the accuracy of the visual system based on the multiple frames of standard film images comprises: Based on the multiple frames of standard film images, generating the target number of repeated images; The accuracy of the vision system is evaluated based on the number of repeated images of the target image.

2. The method according to claim 1, characterized in that The step of increasing the shooting frequency of the visual system according to the number of target images includes: Determining the increase multiple of the shooting frequency according to the number of the target images; The shooting frequency of the visual system is adjusted according to the amplification factor.

3. The method according to claim 1, characterized in that The step of generating the target number of repeated images based on the multiple frames of standard film images comprises: Get the target number of standard slice images required to generate one frame of repeated images; In the plurality of frames of standard film images, standard film images are extracted in a manner of spacing the number of rows of the target number of images to obtain a target number of groups of standard film images, each group of standard film images including the target number of standard film images; Each set of standard film images is used to generate one frame of repeated images.

4. The method according to claim 3, characterized in that The method of using each group of standard film images to generate one frame of repeated images comprises: Each group of standard film images is stitched into one frame of initial image; The physical size of the pixels in each frame of the initial image is increased by a target multiple to obtain a corresponding repeated image, wherein the target multiple is the increase multiple of the shooting frequency.

5. The method according to claim 1, characterized in that The step of evaluating the accuracy of the visual system based on the repeated images of the target image number comprises: Determining the measurement value of the standard film according to the repeated images of the target image quantity; The accuracy of the visual system is evaluated using the measured values ​​and the standard values ​​of the standard film obtained in advance.

6. The method according to claim 5, characterized in that Before evaluating the accuracy of the visual system using the measured value and the pre-acquired standard value of the standard film, the method further includes: Obtaining respective stretching rates of the measured material strip and the standard sheet under the same tension; The standard value of the standard sheet is obtained by using the stretch rate of the measured material strip, the stretch rate of the standard sheet and the measured value of the standard sheet under no tension.

7. A visual system evaluation system, characterized in that: The system comprises: a visual system, a standard sheet, a material strip to be measured and a controller, wherein the standard sheet is consistent with the material strip to be measured in shape, the standard sheet is pasted on the material strip to be measured, and the controller is connected to the visual system; The controller is used to execute the method according to any one of claims 1 to 6.

8. The system according to claim 7, characterized in that In the case where the material strip to be measured is a battery electrode, the battery electrode comprises a coating area and a blank area; The standard sheet is provided with a plurality of first areas and a plurality of second areas, and the plurality of first areas and the plurality of second areas are sequentially spaced apart from each other on the standard sheet; The width and grayscale of the first area are consistent with the width and grayscale of the coating area, and the width and grayscale of the second area are consistent with the width and grayscale of the blank area.

9. An evaluation device for a visual system, the visual system being used to detect a material strip to be tested, characterized in that: The device comprises: A line frequency adjustment module, used to increase the shooting frequency of the visual system according to the number of target images, wherein the shooting frequency is the number of acquisitions per unit time; An acquisition module, used for photographing the standard film attached to the material strip to be measured through the visual system during the transmission of the material strip to be measured, so as to obtain a continuous multi-frame standard film image; the standard film is consistent with the shape of the material strip to be measured; An evaluation module, used for evaluating the accuracy of the visual system based on the multiple frames of standard film images; The evaluation module is specifically used to generate the target number of repeated images based on the multiple frames of standard film images; and evaluate the accuracy of the visual system according to the target number of repeated images.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 6 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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