Expansion and shrinkage correction method and system in laser imaging process and related equipment

Abstract

The embodiment of the invention provides an expansion and shrinkage correction method and system in a laser imaging process and related equipment, which are used for eliminating or reducing irregular expansion and shrinkage in the laser imaging process and improving the precision of laser imaging. The method provided by the embodiment of the invention comprises the following steps: dividing an image area after exposure and development into a plurality of development areas, and detecting actual deviation values between positions of mark points of the development areas corresponding to laser light sources and theoretical positions to form an input sequence; inputting the input sequence into a preset initial model for training to obtain an offset model, and inputting the positions of the exposure points in the to-be-exposed image into the offset model to calculate the offset of each exposure point; and performing reverse equivalent adjustment on the offset corresponding to the exposure point in the to-be-exposed image to obtain a corrected image for laser scanning imaging.

Description

Technical Field

[0001] The present invention relates to the technical field of laser direct imaging, and in particular to a method, system and related equipment for correcting expansion and contraction during laser imaging. Background Art

[0002] Laser direct imaging refers to exposing the pixels on the photosensitive resin coating surface through laser, thereby generating the desired image on the photosensitive resin coating surface. Common laser direct imaging methods include: laser imaging based on DMD (digital micromirror device), laser array scanning imaging, etc.

[0003] The existing laser imaging technology based on DMD (digital micromirror device) is to expose and image the entire image in the photosensitive resin coating area. The photosensitive resin in this area is solidified at the same time, and the entire image format shows a uniform thermal expansion and contraction phenomenon. In this case, you only need to enlarge or reduce the entire image in proportion.

[0004] The applicant found that when using laser array scanning imaging technology, since the laser is used to expose the image line by line, the expansion and contraction of the area exposed first is the most obvious, while the expansion and contraction of the area exposed later will become less and less obvious until the last exposed part has no expansion and contraction. The image finally exposed shows a phenomenon of uneven expansion and contraction due to the different exposure order. Therefore, when using laser array scanning imaging technology, the corresponding method (overall proportional enlargement or reduction) of laser imaging technology based on DMD (digital micromirror device) cannot be used to repair the image error caused by uneven expansion and contraction.

[0005] How to reduce or eliminate image errors caused by uneven expansion and contraction during laser scanning has become an urgent problem to be solved in the field of laser scanning imaging technology. Summary of the invention

[0006] The embodiments of the present invention provide a method, system and related equipment for correcting expansion and contraction during laser imaging, which are used to eliminate or reduce irregular expansion and contraction during laser imaging and improve the accuracy of laser imaging.

[0007] A first aspect of an embodiment of the present invention provides a method for correcting expansion and contraction during laser imaging, which may include:

[0008] The image area after exposure and development is divided into a plurality of development areas, and the actual deviation value between the position of the marking point of each development area and the theoretical position is detected to form an input sequence, and the input sequence is input into a preset initial model for training to obtain an offset model;

[0009] Inputting the positions of the exposure points in the image to be exposed into the offset model to calculate the offset of each exposure point;

[0010] The offset corresponding to the exposure point in the image to be exposed is adjusted in the opposite direction by an equal amount to obtain a corrected image for laser scanning imaging.

[0011] Optionally, as a possible implementation manner, in the embodiment of the present invention, inputting the input sequence into a preset initial model for training to obtain an offset model may include:

[0012] According to r = s / ∑ (1 / d i 2 ) Calculate the offset parameter r of the marker points in each area, where s is the actual deviation value corresponding to the current marker point, d i is the distance between the remaining marked points and the current marked point, and i is the relative label of each area;

[0013] According to s = r * ∑ (1 / d i 2 ) Establish a marker point offset matrix for each area;

[0014] An offset mapping model for any exposure point is established based on the linear proportional relationship between the exposure time of any exposure point in each area and the corresponding marking point.

[0015] Optionally, as a possible implementation manner, in the embodiment of the present invention, dividing the image area after exposure and development into a plurality of development areas may include:

[0016] The image area after exposure and development is divided into development areas equal to the number of laser light sources.

[0017] Optionally, as a possible implementation manner, in the embodiment of the present invention, dividing the image area after exposure and development into a plurality of development areas may include:

[0018] The number of divided development areas of the image area after exposure and development is an integral multiple of the number of laser light sources.

[0019] A second aspect of an embodiment of the present invention provides a system for correcting expansion and contraction during laser imaging, which may include:

[0020] A detection module, used for dividing the image area after exposure and development into a plurality of development areas, and detecting the actual deviation between the position of the marking point of each development area and the theoretical position to form an input sequence;

[0021] A calculation module, used for inputting the input sequence into a preset initial model for training to obtain an offset model, and inputting the positions of the exposure points in the image to be exposed into the offset model to calculate the offset of each exposure point;

[0022] The adjustment module is used to perform reverse and equal adjustment on the offset corresponding to the exposure point in the image to be exposed to obtain a corrected image for laser scanning imaging.

[0023] Optionally, as a possible implementation, in the embodiment of the present invention, the calculation module may include:

[0024] The first calculation unit, according to r = s / ∑ (1 / d i 2 ) Calculate the offset parameter r of the marker points in each area, where s is the actual deviation value corresponding to the current marker point, d i is the distance between the remaining marked points and the current marked point, and i is the relative label of each area;

[0025] The second calculation unit, according to s=r*∑(1 / d i 2 ) Establish a marker point offset matrix for each area;

[0026] The third calculation unit establishes an offset mapping model of any exposure point according to a linear proportional relationship between the exposure time of any exposure point in each area and the corresponding marking point.

[0027] Optionally, as a possible implementation manner, in the embodiment of the present invention, the detection module may include:

[0028] The first detection unit is used to divide the image area after exposure and development into development areas equal in number to the laser light source, and detect the actual deviation between the position of the marking point of each development area and the theoretical position to form an input sequence.

[0029] Optionally, as a possible implementation, in the embodiment of the present invention, the detection module may include:

[0030] The second detection unit is used to divide the image area after exposure and development into development areas whose number is an integral multiple of the number of laser light sources, and detect the actual deviation value between the position of the marking point of each development area and the theoretical position to form an input sequence.

[0031] A third aspect of an embodiment of the present invention provides a computer device, the computer device comprising a processor, the processor being configured to implement the steps in the first aspect and any possible implementation manner of the first aspect when executing a computer program stored in a memory.

[0032] A fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps in the first aspect and any possible implementation of the first aspect are implemented.

[0033] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0034] In the embodiment of the present invention, the image area after exposure and development is divided into a plurality of development areas in advance, and an input sequence is formed according to the actual deviation value between the position of the marking point of the development area corresponding to each laser light source and the theoretical position, and the input sequence is input into the preset initial model training to obtain an offset model. In the case where the laser position in the laser array remains unchanged, in a new production process, the position of the exposure point in the image to be exposed is input into the offset model to predict and calculate the offset of each exposure point, and then the offset corresponding to the exposure point in the image to be exposed is adjusted in the reverse amount to obtain a corrected image for laser scanning imaging. After exposure imaging is performed according to the exposure point position in the corrected image, the offset of the corrected offset in the corrected image is offset by irregular expansion and contraction, and then the deviation between the actual exposure position obtained and the exposure point position in the image to be exposed is reduced or eliminated, thereby improving the accuracy of laser imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of an embodiment of a method for correcting expansion and contraction during laser imaging in an embodiment of the present invention;

[0036] Figure 2 FIG. 1 is a schematic diagram of an embodiment of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] In the description of this application, unless otherwise specified, "multiple" means two or more. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 components.

[0040] For ease of understanding, the laser array in the embodiment of the present invention is described below. The laser array is composed of laser light sources arranged in a non-overlapping manner in the scanning vertical direction. The position distribution in the scanning direction can overlap or not overlap, as long as the relative positions of the lasers remain unchanged. The specific process in the embodiment of the present invention is described below. Figure 1 In an embodiment of the present invention, an embodiment of a method for correcting expansion and contraction during laser imaging may include:

[0041] S101: dividing the image area after exposure and development into a plurality of development areas, and detecting the actual deviation between the position of the marking point of the development area corresponding to each laser light source and the theoretical position to form an input sequence;

[0042] Based on the laser array scanning imaging process, the applicant found that since each laser in the laser array exposes different areas respectively, the order in which the pixel rows in different areas are exposed row by row is different. The area exposed first has a certain expansion and contraction effect on the area exposed later, resulting in the image after final development showing irregular expansion and contraction.

[0043] In order to eliminate or reduce irregular expansion and contraction, the applicant proposed that before mass production, the offset of the developing areas of different lasers is calculated respectively, and the actual deviation value between the position of the marking point of each developing area and the theoretical position is detected to form an input sequence, and the input sequence is input into the preset initial model training to obtain an offset model. Since the position of the laser in the laser array remains unchanged, the relative position of the subsequent exposure area remains unchanged, and the deviation of irregular expansion and contraction is also similar. After the model training is completed, when the same laser array is used for exposure imaging again, the image to be exposed can be adjusted in the opposite direction by the same amount, so that the offset after exposure is offset, thereby reducing or eliminating the laser imaging error caused by uneven expansion and contraction during laser scanning.

[0044] To this end, in an embodiment of the present invention, the image area after exposure and development is divided into multiple development areas (the number of each development area can be equal to the number of laser light sources, or can be an integer multiple of the number of laser light sources), and the actual deviation value between the position of the marking point of each development area and the theoretical position is detected to form an input sequence, and the input sequence is input into a preset initial model for training to obtain an offset model.

[0045] In the embodiment of the present application, the applicant found that the force between different exposure areas is inversely proportional to the square of the distance, so the position offset s of other areas outside any area (for example, the target area) to the target area is i With d i There is also an inverse proportional relationship between them, i is the relative number of each area. The actual deviation value s between the position of the marked point in each area detected and the theoretical position can be used as s i Based on the above model analysis, for example, the process of inputting the input sequence into the preset initial model training to obtain the offset model in the embodiment of the present application may include: according to r = s / ∑ (1 / d i 2 ) Calculate the offset parameter r of the marker points in each area, where s is the actual deviation value corresponding to the current marker point, d i is the distance between the remaining marking points and the current marking point; then according to s = r*∑(1 / d i 2 ) establishes a marker point offset matrix for each area; finally, an offset mapping model for any exposure point is established based on the linear proportional relationship between any exposure point in each area and the exposure time of the corresponding marker point in the area.

[0046] It is understandable that the above modeling process is only exemplary. In actual application, it can also be based on s i With d i There is an inverse proportional correlation between them to establish other forms of univariate function relationships, and then establish a corresponding preset initial model to perform approximate simulation calculations on the offset, which is not limited here.

[0047] S102: inputting the input sequence into a preset initial model for training to obtain an offset model, and inputting the positions of the exposure points in the image to be exposed into the offset model to calculate the offset of each exposure point;

[0048] After the preset initial model is trained to obtain the offset model, the positions of the exposure points in the image to be exposed can be input into the offset model to calculate the offset of each exposure point.

[0049] S103: Performing reverse equal adjustment on the offset corresponding to the exposure point in the image to be exposed to obtain a corrected image for laser scanning imaging.

[0050] After obtaining the offset of each exposure point, the offset corresponding to the exposure point in the exposure image is adjusted in the opposite direction by the same amount to obtain a corrected image for laser scanning imaging. For example, after the coordinate point (1, 1) undergoes irregular expansion and contraction offset, its actual position becomes (1+dx, 1+dy). After the offset model predicts the dx and dy of the point, the pixel position of the coordinate point (1, 1) in the image is moved to (1-dx, 1-dy). In this way, after the irregular expansion and contraction offset, the corrected offset in the corrected image is offset, and the actual position obtained is at (1, 1), which is consistent with the theoretical position of the exposure point in the exposure image.

[0051] It can be known from the above disclosure that in the embodiment of the present application, an input sequence can be formed according to the actual deviation value between the position of the marking point of each developing area corresponding to each laser in each laser array and the theoretical position, and the input sequence is input into the preset initial model training to obtain an offset model. In the case where the position of the laser in the laser array remains unchanged, in the new production process, the position of the exposure point in the image to be exposed is input into the offset model to predict and calculate the offset of each exposure point, and then the offset corresponding to the exposure point in the image to be exposed is adjusted in the opposite direction by an equal amount to obtain a corrected image for laser scanning imaging. After exposure imaging is performed according to the position of the exposure point in the corrected image, the offset of the corrected offset in the corrected image is offset by irregular expansion and contraction, and then the deviation between the actual exposure position obtained and the position of the exposure point in the image to be exposed is reduced or eliminated, thereby improving the accuracy of laser imaging.

[0052] The embodiment of the present application also provides a system for correcting expansion and contraction during laser imaging, which may include:

[0053] A detection module, used for dividing the image area after exposure and development into a plurality of development areas, and detecting the actual deviation between the position of the marking point of each development area and the theoretical position to form an input sequence;

[0054] A calculation module, used for inputting the input sequence into a preset initial model for training to obtain an offset model, and inputting the position of the exposure point in the image to be exposed into the offset model to calculate the offset of each exposure point;

[0055] The adjustment module is used to perform reverse and equal adjustment on the offset corresponding to the exposure point in the image to be exposed, so as to obtain a corrected image for laser scanning imaging.

[0056] Optionally, as a possible implementation, in the embodiment of the present invention, the calculation module may include:

[0057] The first calculation unit, according to r = s / ∑ (1 / d i 2 ) Calculate the offset parameter r of the marker points in each area, where s is the actual deviation value corresponding to the current marker point, di is the distance between the remaining marked points and the current marked point, and i is the relative label of each area;

[0058] The second calculation unit, according to s=r*∑(1 / d i 2 ) Establish a marker point offset matrix for each area;

[0059] The third calculation unit establishes an offset mapping model of any exposure point according to a linear proportional relationship between the exposure time of any exposure point in each area and the corresponding marking point.

[0060] Optionally, as a possible implementation manner, in the embodiment of the present invention, the detection module may include:

[0061] The first detection unit is used to divide the image area after exposure and development into development areas equal in number to the laser light source, and detect the actual deviation between the position of the marking point of each development area and the theoretical position to form an input sequence.

[0062] Optionally, as a possible implementation, in the embodiment of the present invention, the detection module may include:

[0063] The second detection unit is used to divide the image area after exposure and development into development areas whose number is an integral multiple of the number of laser light sources, and detect the actual deviation value between the position of the marking point of each development area and the theoretical position to form an input sequence.

[0064] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0065] The above describes the expansion and contraction correction system in the laser imaging process in the embodiment of the present invention from the perspective of modular functional entities. Figure 2 , the computer device in the embodiment of the present invention is described below from the perspective of hardware processing:

[0066] The computer device 1 may include a memory 11, a processor 12 and an input / output bus 13. The processor 12 implements the above Figure 1 The steps in the method embodiment shown are, for example, Figure 1 Alternatively, when the processor executes the computer program, the functions of each module or unit in the above-mentioned device embodiments are realized.

[0067] The memory 11 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, etc. In some embodiments, the memory 11 may be an internal storage unit of the computer device 1, such as a hard disk of the computer device 1. In other embodiments, the memory 11 may also be an external storage device of the computer device 1, such as a plug-in hard disk equipped on the computer device 1, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Further, the memory 11 may also include both an internal storage unit of the computer device 1 and an external storage device. The memory 11 may not only be used to store application software and various types of data installed in the computer device 1, such as the code of a computer program, etc., but may also be used to temporarily store data that has been output or is to be output.

[0068] In some embodiments, the processor 12 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor or other data processing chip, and is used to run program codes or process data stored in the memory 11, such as executing a computer program.

[0069] The input / output bus 13 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc.

[0070] Furthermore, the computer device may also include a wired or wireless network interface 14. The network interface 14 may optionally include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is usually used to establish a communication connection between the computer device 1 and other electronic devices.

[0071] Optionally, the computer device 1 may also include a user interface, which may include a display (Display), an input unit such as a keyboard (Keyboard), and optionally, the user interface may also include a standard wired interface and a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, and an OLED (Organic Light-Emitting Diode) touch device, etc. The display may also be appropriately referred to as a display screen or a display unit, which is used to display information processed in the computer device 1 and to display a visual user interface.

[0072] Figure 2 Only the computer device 1 having components 11-14 and a computer program is shown, and those skilled in the art will understand that Figure 2 The structure shown does not constitute a limitation on the computer device 1, and may include fewer or more components than shown in the figure, or combine certain components, or arrange the components differently.

[0073] The present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the following can be achieved: Figure 1 Alternatively, when the processor executes the computer program, the functions of each module or unit in the above-mentioned device embodiments are realized.

[0074] In the several embodiments provided in the present application, it should be understood that the disclosed systems, modules and units can be implemented in other ways. For example, the system embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0075] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0076] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0077] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0078] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for correcting expansion and contraction during laser imaging, characterized in that: A laser array consisting of laser light sources arranged non-overlappingly in the vertical direction for scanning, including: The image area after exposure and development is divided into a plurality of development areas, and the actual deviation values ​​between the positions of the marking points of the development areas corresponding to the laser light sources and the theoretical positions are detected to form an input sequence; Input the input sequence into a preset initial model for training to obtain an offset model, and input the positions of exposure points in the image to be exposed into the offset model to calculate the offset of each exposure point; The offset corresponding to the exposure point in the image to be exposed is adjusted in the opposite direction by an equal amount to obtain a corrected image for laser scanning imaging.

2. The method according to claim 1, characterized in that Inputting the input sequence into a preset initial model for training to obtain an offset model includes: According to r = s / ∑(1 / d i 2 ) Calculate the offset parameter r of the marker point in each area, where s is the actual deviation value corresponding to the current marker point, d i is the distance between the remaining marked points and the current marked point, and i is the relative label of each area; According to s = r * ∑ (1 / d i 2 ) Establish a marker point offset matrix for each area; An offset mapping model for any exposure point is established based on the linear proportional relationship between the exposure time of any exposure point in each area and the corresponding marking point.

3. The method according to claim 1 or 2, characterized in that: The image area after exposure and development is divided into multiple development areas, including: The image area after exposure and development is divided into development areas equal to the number of laser light sources.

4. The method according to claim 1 or 2, characterized in that: The image area after exposure and development is divided into multiple development areas, including: The number of divided development areas of the image area after exposure and development is an integral multiple of the number of laser light sources.

5. A system for correcting expansion and contraction during laser imaging, characterized in that: include: A detection module, used for dividing the image area after exposure and development into a plurality of development areas, and detecting the actual deviation between the position of the marking point of each development area and the theoretical position to form an input sequence; A calculation module, used for inputting the input sequence into a preset initial model for training to obtain an offset model, and inputting the positions of the exposure points in the image to be exposed into the offset model to calculate the offset of each exposure point; The adjustment module is used to perform reverse and equal adjustment on the offset corresponding to the exposure point in the image to be exposed to obtain a corrected image for laser scanning imaging.

6. The system according to claim 5, characterized in that Computing module, including: The first calculation unit, according to r = s / ∑ (1 / d i 2 ) Calculate the offset parameter r of the marker point in each area, where s is the actual deviation value corresponding to the current marker point, d i is the distance between the remaining marked points and the current marked point, and i is the relative label of each area; The second calculation unit, according to s=r*∑(1 / d i 2 ) Establish a marker point offset matrix for each area; The third calculation unit establishes an offset mapping model of any exposure point according to a linear proportional relationship between the exposure time of any exposure point in each area and the corresponding marking point.

7. The system according to claim 5 or 6, characterized in that: Detection module, including: The first detection unit is used to divide the image area after exposure and development into development areas equal in number to the laser light source, and detect the actual deviation between the position of the marking point of each development area and the theoretical position to form an input sequence.

8. The system according to claim 5 or 6, characterized in that: Detection module, including: The second detection unit is used to divide the image area after exposure and development into development areas whose number is an integral multiple of the number of laser light sources, and detect the actual deviation value between the position of the marking point of each development area and the theoretical position to form an input sequence.

9. A computer device, characterized in that: The computer device comprises a processor, and the processor is configured to implement the method according to any one of claims 1 to 4 when executing a computer program stored in a memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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