Roll-to-roll correction method and apparatus

Abstract

The present application relates to a kind of roll-to-roll deviation correction method and device, the method is applied to roll-to-roll processing system, the roll-to-roll processing system is used to process flexible material, the method comprises: the image in first detection range is obtained as first detection image;According to the first detection image, obtain multiple first key points;According to the multiple first key points, first actual film edge of the flexible material is fitted;The difference between the first actual film edge and first initial film edge is obtained as first deviation value;If the first deviation value is greater than or equal to first preset threshold, adjust the motion distance of material driving motor and the motion distance of material receiving driving motor, to adjust the film edge position of the flexible material between material sending roll and material receiving roll.The present application embodiment is simple to operate, and the number of adjustment can also be reduced, avoid the damage caused to motor by frequent adjustment.

Description

Technical Field

[0001] This invention relates to the field of flexible material processing, and in particular to a roll-to-roll correction method and apparatus. Background Technology

[0002] Roll-to-roll, also known as roll-to-roll processing, is a process that uses a continuous roll-to-roll transport system to achieve efficient and stable processing of flexible materials. Commonly used roll-to-roll processing techniques include continuous coating of battery electrodes, roll-to-roll printing of conductive lines, and PI film (polyester film) processing.

[0003] Roll-to-roll processing equipment / systems typically include an unwind roll and a rewind roll. The unwind roll releases the flexible material to be processed, and the finished product is retrieved by the rewind roll. In roll-to-roll processing, the flexible material is placed at a slight tilt during unwinding, and this tilt will be amplified during subsequent processing. Furthermore, uneven thickness and stretching of the flexible material after processing can also cause tilting. Tilting of the flexible material can affect processing quality, lead to uneven edges during rewinding, impacting packaging and transportation quality, and also affecting aesthetics. Summary of the Invention

[0004] To solve the above-mentioned technical problems, or at least partially solve them, the present invention provides a roll-to-roll correction method and apparatus.

[0005] In a first aspect, the present invention provides a roll-to-roll web alignment method, the method being applied to a roll-to-roll processing system for processing flexible materials, the method comprising:

[0006] The image within the first detection range is used as the first detection image;

[0007] Based on the first detected image, multiple first key points are obtained;

[0008] Based on the multiple first key points, the first actual membrane edge of the flexible material is obtained by fitting.

[0009] The difference between the first actual membrane edge and the first initial membrane edge is obtained as the first deviation value;

[0010] If the first deviation value is greater than or equal to the first preset threshold, the movement distance of the feeding drive motor and the movement distance of the take-up drive motor are adjusted to adjust the film edge position of the flexible material between the feeding roll and the take-up roll.

[0011] Optionally, if the deviation value is less than the first preset threshold, then:

[0012] The image within the second detection range is used as the second detection image;

[0013] Based on the second detected image, multiple second key points are obtained;

[0014] Based on the multiple second key points, the second actual membrane edge of the flexible material is obtained by fitting.

[0015] The difference between the second actual membrane edge and the second initial membrane edge is obtained as the second deviation value;

[0016] If the second deviation value is greater than or equal to the second preset threshold, the movement distance of the feeding drive motor and the movement distance of the receiving drive motor are adjusted to adjust the edge position of the flexible material.

[0017] Optionally, before acquiring the image within the first detection range as the first detection image, the method further includes:

[0018] When the flexible material is in place, but the feeding drive motor and the receiving drive motor are not started, the film edge position is obtained within the first detection range as the first initial film edge, and the film edge position is obtained within the second detection range as the second initial film edge.

[0019] Optionally, before acquiring the image within the first detection range as the first detection image, the method further includes:

[0020] Obtain the first detection bit;

[0021] A preset range centered on the first detection position is obtained as the first detection range;

[0022] The image within the first detection range is acquired as the first initial image;

[0023] Based on the first initial image, obtain multiple first initial points;

[0024] The first initial membrane edge of the flexible material is obtained by fitting based on the plurality of first initial points.

[0025] Optionally, before acquiring the image within the second detection range as the second detection image, the method further includes:

[0026] Obtain the second detection position, which is a position diagonally opposite to the first detection position within the correction area;

[0027] The correction area is a rectangular area in the roll-to-roll processing system that includes two edges of a portion of the flexible material.

[0028] Optionally, the step of obtaining multiple first key points based on the first detected image includes:

[0029] The first detected image is denoised and binarized to obtain the first enhanced image;

[0030] The region including the boundary between light and dark areas in the first enhanced image is selected as the first sampling region;

[0031] Multiple points on the boundary between light and dark areas within the first sampling area are obtained as the first key points.

[0032] Optionally, the expression for the first actual membrane edge is:

[0033]

[0034] in,

[0035]

[0036]

[0037]

[0038] ( ) is the first The coordinates of the first key point.

[0039] Optionally, the travel distance of the feeding drive motor and the travel distance of the receiving drive motor are obtained in the following manner:

[0040]

[0041]

[0042] This refers to the distance the material feeding drive motor travels. L represents the travel distance of the take-up drive motor, and L is the total length of the flexible material from the feed roll inlet to the take-up roll outlet. This is the first deviation value. This is the second deviation value.

[0043] Secondly, a roll-to-roll web guiding device is provided, the device being applied to a roll-to-roll processing system for processing flexible materials, the device comprising:

[0044] An image acquisition unit is used to acquire an image within a first detection range as a first detection image;

[0045] An image processing unit is configured to acquire multiple first key points based on the first detected image;

[0046] A processor is configured to fit the first actual membrane edge of the flexible material based on the plurality of first key points;

[0047] The processor is also configured to obtain the difference between the first actual membrane edge and the first initial membrane edge as a first deviation value;

[0048] If the first deviation value is greater than or equal to the first preset threshold, the movement distance of the feeding drive motor and the movement distance of the take-up drive motor are adjusted to adjust the film edge position of the flexible material between the feeding roll and the take-up roll.

[0049] Optionally, the image acquisition unit is further configured to:

[0050] If the deviation value is less than the first preset threshold, then the image within the second detection range is acquired as the second detection image.

[0051] The image processing unit is also used for:

[0052] Based on the second detected image, multiple second key points are obtained.

[0053] The processor is also used for:

[0054] Based on the aforementioned multiple second key points, the second actual membrane edge of the flexible material is obtained through fitting.

[0055] The difference between the second actual membrane edge and the second initial membrane edge is obtained as the second deviation value.

[0056] If the second deviation value is greater than or equal to the second preset threshold, the movement distance of the feeding drive motor and the movement distance of the receiving drive motor are adjusted to adjust the edge position of the flexible material.

[0057] In this embodiment of the invention, the processor is further configured to:

[0058] Before acquiring the image within the first detection range as the first detection image, when the flexible material is in place but the feeding drive motor and the receiving drive motor are not started, the film edge position is acquired within the first detection range as the first initial film edge, and the film edge position is acquired within the second detection range as the second initial film edge.

[0059] This invention provides a roll-to-roll correction method and apparatus. The method is applied to a roll-to-roll processing system for processing flexible materials. The method includes: acquiring an image within a first detection range as a first detection image; acquiring multiple first key points based on the first detection image; fitting a first actual film edge of the flexible material based on the multiple first key points; acquiring the difference between the first actual film edge and a first initial film edge as a first deviation value; if the first deviation value is greater than or equal to a first preset threshold, adjusting the movement distance of the feeding drive motor and the take-up drive motor to adjust the position of the film edge of the flexible material between the feeding roll and the take-up roll. In this embodiment, the acquired first actual film edge and the first initial film edge are compared. The first deviation value indicates whether the tilt or deviation of the flexible material is continuing to increase during roll-to-roll processing. If the first deviation value is less than the first preset threshold, it indicates that the roll-to-roll processing system currently has no offset, or may have a slight offset, and the deviation value is not increasing; if the first deviation value is greater than or equal to the first preset threshold, it indicates that the offset is continuously increasing, and the feeding drive motor and the take-up drive motor need to be adjusted. The method of this invention compares the initial membrane edge with the initial membrane edge. For flexible materials of different widths, there is no need to reset the baseline, making the operation simple. Moreover, comparing the initial membrane edge with the initial membrane edge can reduce the number of adjustments and avoid damage to the motor caused by frequent adjustments. Attached Figure Description

[0060] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0061] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0062] Figure 1 The diagram shows the application environment of the roll-to-roll correction method according to an embodiment of the present invention.

[0063] Figure 2 The diagram shown is a schematic representation of the coordinate system of the roll-to-roll processing system according to an embodiment of the present invention.

[0064] Figure 3 The diagram shown is a schematic flowchart of the roll-to-roll correction method according to an embodiment of the present invention.

[0065] Figure 4 The diagram shown is a schematic representation of the first detection bit, the second detection bit, and the correction area according to an embodiment of the present invention.

[0066] Figure 5 The diagram shown is a structural block diagram of the roll-to-roll correction device according to an embodiment of the present invention.

[0067] Among them, 110 is the feeding roll; 111 is the feeding drive motor; 120 is the receiving roll; 121 is the receiving drive motor; 130 is the flexible material; 300 is the correction area; 310 is the first detection position; and 320 is the second detection position. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0069] Figure 1 The diagram shows the application environment of the roll-to-roll correction method according to an embodiment of the present invention. (Refer to...) Figure 1 This roll-to-roll correction method is applied to roll-to-roll processing systems, which are used to process flexible materials.

[0070] like Figure 1 As shown, the roll-to-roll processing system includes: a feeding roll 110, a feeding drive motor 111, a receiving roll 120, and a receiving drive motor 121. The feeding drive motor 111 is used to drive the feeding roll 110 to rotate to output flexible material 130, and the receiving drive motor 121 is used to drive the receiving roll 120 to rotate to recycle the flexible material 130.

[0071] Figure 2 The diagram shows a schematic of the coordinate system for a roll-to-roll processing system. This top view is a top view of the flexible material 130. Figure 2 As shown, the coordinate system established in this embodiment of the invention is based on the plane where the correction region 300 of the flexible material 130 is located. The coordinate system is a right-handed orthogonal plane coordinate system, with the Y-axis pointing along the direction of motion of the flexible material.

[0072] Figure 3 The diagram shown is a schematic flowchart of a roll-to-roll correction method according to an embodiment of the present invention. Figure 3 As shown, the method includes:

[0073] Step 210: Obtain the image within the first detection range as the first detection image;

[0074] Step 220: Obtain multiple first key points based on the first detected image;

[0075] Step 230: Based on the plurality of first key points, the first actual membrane edge of the flexible material is obtained by fitting.

[0076] Step 240: Obtain the difference between the first actual membrane edge and the first initial membrane edge as the first deviation value;

[0077] Step 250: If the first deviation value is greater than or equal to the first preset threshold, then adjust the movement distance of the feeding drive motor and the movement distance of the take-up drive motor to adjust the film edge position of the flexible material between the feeding roll and the take-up roll.

[0078] In this embodiment of the invention, the initial membrane edge can be described by the following formula:

[0079]

[0080] In this embodiment of the invention, the first actual film edge and the first initial film edge are compared. Based on the first deviation value, it can be seen whether the tilt and deviation of the flexible material during roll-to-roll processing is continuing to increase. If the first deviation value is less than the first preset threshold, it indicates that the roll-to-roll processing system currently has no offset, or may have a slight offset, and the deviation value is not increasing; if the first deviation value is greater than or equal to the first preset threshold, it indicates that the offset is continuously increasing, and the feeding drive motor and the receiving drive motor need to be adjusted.

[0081] Most existing correction methods compare the material to a preset baseline. If the widths of the flexible materials in the roll-to-roll processing system are inconsistent, the baseline needs to be reset, which is cumbersome. Furthermore, if there is already a slight offset during material feeding, adjustments are required when comparing to the preset baseline. In contrast, the method of this invention compares the material to the initial film edge. For flexible materials of different widths, there is no need to reset the baseline, simplifying the operation. Moreover, comparing to the initial film edge reduces the number of adjustments, avoiding damage to the motor caused by frequent adjustments.

[0082] In this embodiment of the invention, if the deviation value is less than the first preset threshold, then:

[0083] The image within the second detection range is used as the second detection image;

[0084] Based on the second detected image, multiple second key points are obtained;

[0085] Based on the multiple second key points, the second actual membrane edge of the flexible material is obtained by fitting.

[0086] The difference between the second actual membrane edge and the second initial membrane edge is obtained as the second deviation value;

[0087] If the second deviation value is greater than or equal to the second preset threshold, the movement distance of the feeding drive motor and the movement distance of the receiving drive motor are adjusted to adjust the edge position of the flexible material.

[0088] In this embodiment of the invention, after setting a second detection range, the second actual membrane edge is compared with the second original membrane edge to correct the deviation again and avoid errors.

[0089] In this embodiment of the invention, before acquiring the image within the first detection range as the first detection image, the method further includes:

[0090] When the flexible material is in place, but the feeding drive motor and the receiving drive motor are not started, the film edge position is obtained within the first detection range as the first initial film edge, and the film edge position is obtained within the second detection range as the second initial film edge.

[0091] In this embodiment of the invention, before acquiring the image within the first detection range as the first detection image, the method further includes:

[0092] Obtain the first detection bit;

[0093] A preset range centered on the first detection position is obtained as the first detection range;

[0094] The image within the first detection range is acquired as the first initial image;

[0095] Based on the first initial image, obtain multiple first initial points;

[0096] The first initial membrane edge of the flexible material is obtained by fitting based on the plurality of first initial points.

[0097] In this embodiment of the invention, before acquiring the image within the second detection range as the second detection image, the method further includes:

[0098] Obtain the second detection position, which is a position diagonally opposite to the first detection position within the correction area;

[0099] The correction area is a rectangular area in the roll-to-roll processing system that includes two edges of a portion of the flexible material.

[0100] Figure 4 The diagram shown is a schematic diagram of the first detection position, the second detection position, and the correction area in an embodiment of the present invention. Figure 4 It can be considered as Figure 1 The system shown is a top view.

[0101] In roll-to-roll processing systems, a region can be set as a correction zone before or after processing flexible materials. Figure 4 In the middle, the flexible material 130, the correction area 300 is a rectangular area containing the two membrane edges of the flexible material 130, and the first detection position 310 and the second detection position 320 are diagonally opposite positions.

[0102] In this embodiment of the invention, both the first actual membrane edge and the first initial membrane edge obtained by fitting are straight lines. The first deviation value and the second deviation value can be obtained based on reference points in the correction region. For example, the first detection position can be directly used as the reference point, and the values ​​can be obtained based on the first detection position. The axis coordinate values ​​are then used to obtain the first actual membrane edge. The first initial membrane edge is ,Will and The difference is used as the first deviation value. Similarly, the second deviation value can also be obtained at the second detection position.

[0103] In other embodiments of the present invention, multiple reference points may be set, and the results may be based on the multiple reference points. The axis coordinates are used to obtain multiple differences, and the average of these differences is used as the first deviation value.

[0104] In this embodiment of the invention, the multiple reference points in the correction area can be randomly selected, fixedly selected, or a combination of randomly selected and fixedly selected points; the reference points can be the first detection point, or multiple points including the first detection point, or multiple points excluding the first detection point.

[0105] In this embodiment of the invention, obtaining multiple first key points based on the first detected image includes:

[0106] The first detected image is denoised and binarized to obtain the first enhanced image;

[0107] The region including the boundary between light and dark areas in the first enhanced image is selected as the first sampling region;

[0108] Multiple points on the boundary between light and dark areas within the first sampling area are obtained as the first key points.

[0109] In this embodiment of the invention, the expression for the first actual membrane edge is:

[0110]

[0111] in,

[0112]

[0113]

[0114]

[0115] ( ) is the first The coordinates of the first key point.

[0116] In this embodiment of the invention, the movement distance of the feeding drive motor and the movement distance of the receiving drive motor are obtained in the following manner:

[0117]

[0118]

[0119] This refers to the distance the material feeding drive motor travels. L represents the travel distance of the take-up drive motor, and L is the total length of the flexible material from the feed roll inlet to the take-up roll outlet. This is the first deviation value. This is the second deviation value.

[0120] The methods for obtaining the second initial membrane edge and the second actual membrane edge are the same as those described above, and will not be repeated here.

[0121] refer to Figure 1 , Figure 2 and Figure 4 As shown, the feeding drive motor 111 drives the feeding roll 110, and the take-up drive motor 121 drives the take-up roll 120. The roll-to-roll processing system is equipped with an upper motion motor (not shown) and a lower motion motor (not shown), which are used to move the feeding drive motor 111 and the take-up drive motor 121 as a whole. That is, the upper and lower motion motors can move the main axis of the feeding drive motor 111 and the main axis of the take-up drive motor 121, with the direction of movement being... Figure 2 The positive and / or negative X-axis in the figure, i.e. Figure 4 The direction of the double-headed arrow in the diagram is shown. The distance moved along the X-axis is the distance traveled.

[0122] The feeding drive motor 111 usually rotates around an axis, which is the main axis of the feeding drive motor 111; similarly, the receiving drive motor 121 also rotates around an axis, which is the main axis of the receiving drive motor 121.

[0123] The method described in this invention is simple to operate and can reduce the number of adjustments, thus avoiding damage to the motor caused by frequent adjustments.

[0124] like Figure 5As shown, the present invention also provides a roll-to-roll web guiding device, which is applied to a roll-to-roll processing system for processing flexible materials. The device includes:

[0125] Image acquisition unit 410 is used to acquire an image within a first detection range as a first detection image;

[0126] Image processing unit 420 is used to obtain a plurality of first key points based on the first detected image;

[0127] Processor 430 is configured to fit the first actual membrane edge of the flexible material based on the plurality of first key points;

[0128] The processor 430 is also configured to obtain the difference between the first actual membrane edge and the first initial membrane edge as a first deviation value;

[0129] If the first deviation value is greater than or equal to the first preset threshold, the movement distance of the feeding drive motor and the movement distance of the take-up drive motor are adjusted to adjust the film edge position of the flexible material between the feeding roll and the take-up roll.

[0130] In this embodiment of the invention, the image acquisition unit 410 is further configured to:

[0131] If the deviation value is less than the first preset threshold, then the image within the second detection range is acquired as the second detection image.

[0132] The image processing unit 420 is further configured to:

[0133] Based on the second detected image, multiple second key points are obtained.

[0134] The processor 430 is also used for:

[0135] Based on the aforementioned multiple second key points, the second actual membrane edge of the flexible material is obtained through fitting.

[0136] The difference between the second actual membrane edge and the second initial membrane edge is obtained as the second deviation value.

[0137] If the second deviation value is greater than or equal to the second preset threshold, the movement distance of the feeding drive motor and the movement distance of the receiving drive motor are adjusted to adjust the edge position of the flexible material.

[0138] In this embodiment of the invention, the processor 430 is further configured to:

[0139] Before acquiring the image within the first detection range as the first detection image, when the flexible material is in place but the feeding drive motor and the receiving drive motor are not started, the film edge position is acquired within the first detection range as the first initial film edge, and the film edge position is acquired within the second detection range as the second initial film edge.

[0140] In this embodiment of the invention, the processor 430 is further configured to:

[0141] Before acquiring the image within the first detection range as the first detection image, the first detection bit is acquired;

[0142] A preset range centered on the first detection position is obtained as the first detection range;

[0143] The image acquisition unit 410 is also used to acquire an image within the first detection range as a first initial image;

[0144] The image processing unit 420 is further configured to obtain a plurality of first initial points based on the first initial image;

[0145] The processor 430 is also used for:

[0146] The first initial membrane edge of the flexible material is obtained by fitting based on the plurality of first initial points.

[0147] In this embodiment of the invention, the processor 430 is further configured to:

[0148] Before acquiring the image within the second detection range as the second detection image, a second detection position is acquired, which is a position diagonally opposite to the first detection position within the correction area.

[0149] The correction area is a rectangular area in the roll-to-roll processing system that includes two edges of a portion of the flexible material.

[0150] In this embodiment of the invention, the image processing unit 420 is further configured to:

[0151] The first detected image is denoised and binarized to obtain the first enhanced image;

[0152] The region including the boundary between light and dark areas in the first enhanced image is selected as the first sampling region;

[0153] Multiple points on the boundary between light and dark areas within the first sampling area are obtained as the first key points.

[0154] In this embodiment of the invention, the expression for the first actual membrane edge is:

[0155]

[0156] in,

[0157]

[0158]

[0159]

[0160] ( ) is the first The coordinates of the first key point.

[0161] In this embodiment of the invention, the processor 430 is further configured to obtain the movement distance of the feeding drive motor and the movement distance of the receiving drive motor in the following manner:

[0162]

[0163]

[0164] This refers to the distance the material feeding drive motor travels. L represents the travel distance of the take-up drive motor, and L is the total length of the flexible material from the feed roll inlet to the take-up roll outlet. This is the first deviation value. This is the second deviation value.

[0165] The device described in this invention is simple to operate and can reduce the number of adjustments required, thus avoiding damage to the motor caused by frequent adjustments.

[0166] Figure 3 This is a flowchart illustrating a roll-to-roll correction method in one embodiment. It should be understood that, although... Figure 3 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 3 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0167] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0168] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0169] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A roll-to-roll correction method, characterized in that, The method is applied to a roll-to-roll processing system for processing flexible materials, and the method includes: The image within the first detection range is used as the first detection image; Based on the first detected image, multiple first key points are obtained; Based on the multiple first key points, the first actual membrane edge of the flexible material is obtained by fitting. The difference between the first actual membrane edge and the first initial membrane edge is obtained as the first deviation value; If the first deviation value is greater than or equal to the first preset threshold, the movement distance of the feeding drive motor and the movement distance of the take-up drive motor are adjusted to adjust the film edge position of the flexible material between the feeding roll and the take-up roll. If the deviation value is less than the first preset threshold, then: The image within the second detection range is used as the second detection image. Based on the second detected image, multiple second key points are obtained. Based on the aforementioned multiple second key points, the second actual membrane edge of the flexible material is obtained through fitting. The difference between the second actual membrane edge and the second initial membrane edge is obtained as the second deviation value. If the second deviation value is greater than or equal to the second preset threshold, the movement distance of the feeding drive motor and the movement distance of the receiving drive motor are adjusted to adjust the edge position of the flexible material. Before acquiring the image within the first detection range as the first detection image, the method further includes: When the flexible material is in place, but the feeding drive motor and the receiving drive motor are not started, the film edge position is obtained within the first detection range as the first initial film edge, and the film edge position is obtained within the second detection range as the second initial film edge. The travel distances of the feeding drive motor and the receiving drive motor are obtained as follows: This refers to the distance the material feeding drive motor travels. L represents the travel distance of the take-up drive motor, and L is the total length of the flexible material from the feed roll inlet to the take-up roll outlet. The first deviation value, This is the second deviation value.

2. The method according to claim 1, characterized in that, Before acquiring the image within the first detection range as the first detection image, the method further includes: Obtain the first detection bit; A preset range centered on the first detection position is obtained as the first detection range; The image within the first detection range is acquired as the first initial image; Based on the first initial image, obtain multiple first initial points; The first initial membrane edge of the flexible material is obtained by fitting based on the plurality of first initial points.

3. The method according to claim 2, characterized in that, Before acquiring the image within the second detection range as the second detection image, the method further includes: Obtain the second detection position, which is a position diagonally opposite to the first detection position within the correction area; The correction area is a rectangular area in the roll-to-roll processing system that includes two edges of a portion of the flexible material.

4. The method according to claim 1, characterized in that, The step of obtaining multiple first key points based on the first detected image includes: The first detected image is denoised and binarized to obtain the first enhanced image; The region including the boundary between light and dark areas in the first enhanced image is selected as the first sampling region; Multiple points on the boundary between light and dark areas within the first sampling area are obtained as the first key points.

5. The method according to claim 1, characterized in that, The expression for the first actual membrane edge is: in, ( ) is the first The coordinates of the first key point.

6. A roll-to-roll web correction device, characterized in that, The apparatus employs the method as described in any one of claims 1 to 5, the apparatus being applied to a roll-to-roll processing system for processing flexible materials, the apparatus comprising: An image acquisition unit is used to acquire an image within a first detection range as a first detection image; An image processing unit is configured to acquire multiple first key points based on the first detected image; A processor is configured to fit the first actual membrane edge of the flexible material based on the plurality of first key points; The processor is also configured to obtain the difference between the first actual membrane edge and the first initial membrane edge as a first deviation value; If the first deviation value is greater than or equal to the first preset threshold, the movement distance of the feeding drive motor and the movement distance of the take-up drive motor are adjusted to adjust the film edge position of the flexible material between the feeding roll and the take-up roll.

7. The apparatus according to claim 6, characterized in that, The image acquisition unit is also used for: If the deviation value is less than the first preset threshold, then the image within the second detection range is acquired as the second detection image. The image processing unit is also used for: Based on the second detected image, multiple second key points are obtained. The processor is also used for: Based on the aforementioned multiple second key points, the second actual membrane edge of the flexible material is obtained through fitting. The difference between the second actual membrane edge and the second initial membrane edge is obtained as the second deviation value. If the second deviation value is greater than or equal to the second preset threshold, the movement distance of the feeding drive motor and the movement distance of the receiving drive motor are adjusted to adjust the edge position of the flexible material.

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