Method, device and storage medium for multi-device mapping calibration of line correction equipment

Abstract

This application relates to the field of LED display production line calibration technology, and in particular to a multi-device mapping calibration method, apparatus, equipment, and storage medium for production line calibration equipment. The calibration method includes: acquiring measurement values ​​of each preset LED module through a reference calibration device and at least one device to be calibrated; establishing a linear mapping relationship from each device to be calibrated to the reference calibration device, using the measurement values ​​of the reference calibration device as reference measurement values; and converting the measurement values ​​of the LED modules to be calibrated acquired by the device to be calibrated into the reference measurement values ​​according to the linear mapping relationship, thereby realizing the mixed assembly and use of LED modules.

Description

Technical Field

[0001] This application relates to the field of LED display production line calibration technology, and in particular to a multi-device mapping calibration method, apparatus, equipment and storage medium for production line calibration equipment. Background Technology

[0002] With the increasing automation in the LED display industry, production line calibration equipment has become a key piece of equipment for achieving lights-out factories and unmanned production. This equipment calibrates LED modules point-by-point, eliminating brightness and color differences between pixels within the module and ensuring the uniformity of the display screen.

[0003] In actual mass production, multiple calibration devices are typically used in parallel to increase production capacity. However, due to differences in optical paths, acquisition errors, and inconsistent calibration standards among different devices, the following problems arise: (1) The brightness and chromaticity standards of LED modules produced by different calibration equipment are inconsistent; (2) Modules calibrated by multiple devices cannot be mixed and used on the same display screen; (3) Obvious color difference and bright / dark partitioning phenomenon appear after large screen splicing; (4) It affects the uniformity of display and limits the large-scale production of the dark factory.

[0004] Therefore, how to achieve high-precision benchmark unification among multiple production line calibration devices, so that LED modules calibrated by different devices can be mixed and used, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the aforementioned technical issues, this application provides a multi-device mapping calibration method, apparatus, equipment, and storage medium for production line calibration equipment, enabling mixed assembly and use of LED modules.

[0006] In a first aspect, this application provides a multi-device mapping calibration method for production line calibration equipment, comprising: acquiring measurement values ​​of each preset LED module through a reference calibration device and at least one device to be calibrated; and establishing a linear mapping relationship from each device to be calibrated to the reference calibration device based on the measurement values ​​of the reference calibration device, wherein the linear mapping relationship is as follows: ; In the formula, This is the calibration value that is consistent with the reference of the reference calibration device after mapping. The measured values ​​collected by the device to be calibrated. This is the gain coefficient. This is the offset coefficient; Based on the linear mapping relationship, the measured values ​​of the LED module to be calibrated collected by the device to be calibrated are converted into the reference measured values.

[0007] Optionally, in some embodiments, the measured values ​​include: RGB tristimulus values, and the linear mapping relationship is established for each channel of the RGB tristimulus values.

[0008] Optionally, in some embodiments, the preset LED module is independent of the LED module to be calibrated, and the number of preset LED modules is not less than 10.

[0009] Optionally, in some embodiments, the gain coefficient and the offset coefficient Calculated based on the least squares method.

[0010] Optionally, in some embodiments, the least squares calculation method is as follows: using the measured value of the preset LED module under the device to be calibrated as the independent variable, and the measured value of the preset LED module under the reference calibration device as the dependent variable, the gain coefficient is calculated by least squares. and the offset coefficient .

[0011] Optionally, in some embodiments, when there are two or more devices to be calibrated, a linear mapping relationship is established between each device to be calibrated and the reference calibration device, and each linear mapping relationship is independent of the others.

[0012] Secondly, this application also provides a multi-device mapping calibration device for production line calibration equipment, applicable to any of the calibration methods described above, wherein the calibration device comprises: The acquisition unit is used to acquire the measurement values ​​of each of the preset LED modules through a reference calibration device and at least one device to be calibrated; The mapping relationship construction unit is used to establish linear mapping relationships from each of the devices to be calibrated to the reference calibration device, using the measurement values ​​of the reference calibration device as reference measurement values. The linear mapping relationships are as follows: ; In the formula, This is the calibration value that is consistent with the reference of the reference calibration device after mapping. The measured values ​​collected by the device to be calibrated. This is the gain coefficient. This is the offset coefficient; The conversion unit is used to convert the measured values ​​of the LED module to be calibrated collected by the device to be calibrated into the reference measured values ​​according to the linear mapping relationship.

[0013] Optionally, in some embodiments, the measured values ​​include: RGB tristimulus values, and the linear mapping relationship is established for each channel of the RGB tristimulus values.

[0014] Thirdly, the present invention also provides an electronic device, comprising: a memory for storing a computer program; and a processor for calling and executing the computer program, wherein the processor executes the computer program to implement the calibration method described in the first aspect above.

[0015] Fourthly, the present invention also provides a computer-readable storage medium storing a program or instructions that cause a computer to perform the calibration method described in the first aspect above.

[0016] The technical solution provided in this application has the following advantages compared with the prior art: The multi-device mapping calibration method 100 for production line calibration equipment provided in this application collects the measurement values ​​of each preset LED module through a reference calibration device and a device to be calibrated. Based on this, a linear mapping relationship is established from the device to be calibrated to the reference calibration device. The gain coefficient is used to eliminate the proportional deviation between the device to be calibrated and the reference calibration device (such as errors caused by differences in lens transmittance and sensor sensitivity), and the offset coefficient is used to eliminate fixed deviations (such as errors caused by dark current and background noise). This transforms the measurement values ​​of the module to be calibrated collected by the device to be calibrated to the reference of the reference calibration device, realizing the standardization of the reference among multiple calibration devices. This allows LED modules calibrated by different calibration devices to be mixed, interchanged, and combined on the same LED display screen, avoiding color difference and brightness / darkness partitioning problems in large-screen splicing caused by deviations between devices. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying 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 any creative effort.

[0019] Figure 1 A schematic flowchart of the multi-device mapping calibration method for production line calibration equipment provided in this application embodiment; Figure 2 A schematic diagram of the structure of the multi-device mapping calibration device for production line calibration equipment provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0022] The following description, in conjunction with the accompanying drawings, provides an exemplary description of the multi-device mapping calibration method, apparatus, equipment, and storage medium for production line calibration equipment provided in the embodiments of this application. Figure 1 This is a flowchart illustrating the multi-device mapping calibration method for the production line calibration equipment provided in this embodiment of the application. First, refer to... Figure 1 The multi-device mapping calibration method 100 for the production line calibration equipment is described in detail below. The calibration method 100 includes the following steps: S101. Acquire the measurement values ​​of the preset LED module through a reference calibration device and at least one device to be calibrated.

[0023] Specifically, firstly, multiple LED modules are selected as preset LED modules and placed sequentially on the measurement station of the reference calibration equipment. The color measurement values ​​of each preset LED module are collected as reference measurement values. Then, the preset LED modules are placed sequentially on the measurement station of the equipment to be calibrated, and the color measurement values ​​of each preset LED module are collected as calibration measurement values. Through the above method, a set of measurement values ​​of the same set of preset LED modules under multiple calibration devices is obtained.

[0024] Optionally, in some embodiments, the preset LED module is independent of the LED module to be calibrated, and the number of preset LED modules is not less than 10.

[0025] Specifically, the preset LED module is a multi-LED module separately selected from the production line specifically for calibration purposes. It is a different physical entity from the LED module currently being calibrated, and the two are independent of each other. After calibration, the preset LED module can be reused for subsequent periodic calibrations without needing to be reselected for each calibration.

[0026] Furthermore, in order to cover the typical brightness and chromaticity ranges on the production line, the number of preset LED modules is no less than 10 to provide sufficient redundant data points. Preferably, the number of preset LED modules is 10, which allows for control of calibration time while ensuring calibration accuracy.

[0027] For example, the measured value may include: RGB tristimulus values.

[0028] Specifically, the RGB tristimulus values ​​can include: red X stimulus value (RX), red Y stimulus value (RY), red Z stimulus value (RZ), green X stimulus value (GX), green Y stimulus value (GY), green Z stimulus value (GZ), and blue X stimulus value (BX), blue Y stimulus value (BY), and blue Z stimulus value (BZ), totaling 9 channels. The RGB tristimulus values ​​of 10 preset LED modules measured by device A (the device to be calibrated) can be denoted as matrix TA, and the RGB tristimulus values ​​of the same set of preset LED modules measured by device B (the reference calibration device) can be denoted as matrix TB. TA and TB are represented as follows: ; ; in, TA and TB Both have 9 lines A 10-column matrix, with red columns... RX , RY , RZ ;green GX , GY , GZ ;blue BX , BY , BZ Each row corresponds to a color channel (e.g., red). RX , RY , RZ (etc.), each column corresponds to a preset LED module.

[0029] S102. Using the measurement value of the reference calibration device as the reference measurement value, establish a linear mapping relationship from each of the devices to be calibrated to the reference calibration device, wherein the linear mapping relationship is: ; In the formula, This is the calibration value that is consistent with the reference of the reference calibration device after mapping. The measured values ​​collected by the device to be calibrated. This is the gain coefficient. This is the offset coefficient.

[0030] This step establishes a linear mapping relationship from the device to be calibrated to the reference calibration device based on the measured values ​​of the preset LED module on the reference calibration device and each device to be calibrated, and solves for the mapping parameters. Specifically, the measured value of the reference calibration device (such as device B) in step S101 is used as the reference measured value. The measured value of the device to be calibrated (e.g., device A) is the value to be calibrated. A linear mapping relationship is obtained through the correspondence between two sets of measured values.

[0031] For example, the gain coefficient and the offset coefficient The gain coefficient is calculated using the least squares method. The least squares calculation method can be as follows: using the measured value of the preset LED module under the calibrated device as the independent variable, and the measured value of the preset LED module under the reference calibration device as the dependent variable, the gain coefficient is calculated using the least squares method. and the offset coefficient .

[0032] Specifically, the least squares method is a data fitting method that finds the optimal combination of parameters to minimize the sum of squared errors between the model's predicted values ​​and the actual observed values. Measurements collected by the device to be calibrated (e.g., device A) can be used as independent variables (input variables), and measurements collected by the reference calibration device (e.g., device B) can be used as dependent variables (target variables). Multiple data point pairs are formed by mapping the independent and dependent variables one-to-one. Then, through the aforementioned linear mapping relationship, a linear mapping relationship between the independent and dependent variables can be established. The gain coefficient is then calculated using the least squares method. and the offset coefficient .

[0033] Taking the red X channel as an example, substituting the measured values ​​of the preset LED modules (e.g., 10 modules) collected in step S101 into the above linear mapping relationship, we can obtain the following formula: ; The formula contains 10 equations, but has 2 unknowns ( and Since the solution cannot be solved precisely, optimization methods are needed to find the optimal approximate solution.

[0034] For example, the least squares method can be used to calculate its optimal approximate solution, that is, to find the optimal approximate solution. and This minimizes the sum of squared errors for all data points.

[0035] The above solution process is for a single color channel. Since the measured values ​​include RGB tristimulus values, totaling 9 channels, it is necessary to establish the linear mapping relationship for each channel of the RGB tristimulus values, and perform the above least squares calculation independently for each channel. Similarly, the same calculation is performed for the other 8 channels (RY, RZ, GX, GY, GZ, BX, BY, BZ) to obtain the gain coefficient and offset coefficient for each channel.

[0036] Based on the least squares method described above, the calculated gain coefficients and offset coefficients for each channel are stored in vector form: , ; Furthermore, when there are two or more devices to be calibrated, a linear mapping relationship is established between each device to be calibrated and the reference calibration device, and each linear mapping relationship is independent of the others.

[0037] Specifically, when there are two or more devices to be calibrated (such as devices A, C, D, etc.), device B is used as the reference calibration device, and a linear mapping relationship from each device to device B is established. For example, the mapping relationship from device A to device B corresponds to the gain coefficient MK. A and offset coefficient MB A The mapping relationship from device C to device B corresponds to the gain coefficient MKc and the offset coefficient MB. c The mapping relationship from device D to device B corresponds to the gain coefficient MK. D and offset coefficient MB D The gain coefficient and offset coefficient of each mapping relationship are calculated and stored independently without interference.

[0038] S103. Based on the linear mapping relationship, convert the measured values ​​of the LED module to be calibrated collected by the device to be calibrated into the reference measured values.

[0039] Specifically, based on the linear mapping relationship established in step S102, the measurement values ​​of the LED module to be calibrated collected by the device to be calibrated are converted into the reference measurement values ​​of the reference calibration device. For example, after conversion... To ensure the calibration value is consistent with the reference calibration equipment, Output to device A The calibration module is used to perform point-by-point calibration of the LED module to be calibrated.

[0040] because It has been unified to the reference calibration equipment B Under the benchmark, the equipment A Corrected LED modules and equipment BThe calibrated LED modules have a consistent brightness and colorimetric standard. Therefore, calibrated LED modules can be mixed, interchanged, and combined on the same LED display screen, avoiding color differences and bright / dark zoning issues in large-screen splicing caused by deviations between devices.

[0041] In summary, the multi-device mapping calibration method 100 for production line calibration equipment provided in this application collects the measurement values ​​of each preset LED module through a reference calibration device and a device to be calibrated. Based on this, a linear mapping relationship is established from the device to be calibrated to the reference calibration device. The gain coefficient is used to eliminate the proportional deviation between the device to be calibrated and the reference calibration device (such as errors caused by differences in lens transmittance and sensor sensitivity), and the offset coefficient is used to eliminate fixed deviations (such as errors caused by dark current and background noise). This transforms the measurement values ​​of the module to be calibrated collected by the device to be calibrated to the reference of the reference calibration device, achieving reference unification among multiple calibration devices. Furthermore, LED modules calibrated by different calibration devices can be mixed, interchanged, and combined on the same LED display screen, avoiding color difference and brightness / darkness zoning problems in large-screen splicing caused by deviations between devices.

[0042] Based on the same inventive concept, this application also provides a multi-device mapping calibration device 200 for production line calibration equipment. Figure 2 This is a schematic diagram of the structure of the multi-device mapping calibration device for the production line calibration equipment provided in this application embodiment. Figure 2 As shown, the calibration device 200 may include: The acquisition unit 201 is used to acquire the measurement values ​​of each of the preset LED modules through a reference calibration device and at least one device to be calibrated.

[0043] For example, the measured values ​​include: RGB tristimulus values, and the linear mapping relationship is established for each channel of the RGB tristimulus values.

[0044] Specifically, the RGB tristimulus values ​​can include: red X stimulus value (RX), red Y stimulus value (RY), red Z stimulus value (RZ), green X stimulus value (GX), green Y stimulus value (GY), green Z stimulus value (GZ), blue X stimulus value (BX), blue Y stimulus value (BY), and blue Z stimulus value (BZ), for a total of 9 channels.

[0045] The linear mapping relationship is established for each channel of the RGB tristimulus values, and the above least squares calculation is performed independently for each channel. Similarly, the same calculation is performed for the other 8 channels (RY, RZ, GX, GY, GZ, BX, BY, BZ) to obtain the gain coefficient and offset coefficient of each channel.

[0046] Mapping relationship construction unit 202 is used to establish linear mapping relationships from each of the devices to be calibrated to the reference calibration device, using the measurement value of the reference calibration device as the reference measurement value. The linear mapping relationship is as follows: ; In the formula, This is the calibration value that is consistent with the reference of the reference calibration device after mapping. The measured values ​​collected by the device to be calibrated. This is the gain coefficient. This is the offset coefficient.

[0047] The conversion unit 203 is used to convert the measured values ​​of the LED module to be calibrated collected by the device to be calibrated into the reference measured values ​​according to the linear mapping relationship.

[0048] The calibration device provided in the above embodiments can perform the calibration methods provided in the above embodiments and has the same or corresponding beneficial effects, which will not be described in detail here.

[0049] This application also provides an electronic device, such as a terminal or a server. The server can be a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The terminal can be a smartphone, tablet computer, laptop computer, desktop computer, etc., but is not limited to these.

[0050] The structural schematic diagram of the electronic device provided in the embodiments of this application is shown below. Figure 3 As shown, it may include: Processor 1, communication interface 2, memory 3, and communication bus 4; The processor 1, communication interface 2, and memory 3 communicate with each other via communication bus 4. Optionally, communication interface 2 can be an interface of a communication module, such as the interface of a GSM module; Processor 1 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of this application.

[0051] Memory 3 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk storage device. Specifically, processor 1 executes the computer program stored in memory 3 to perform the calibration methods provided in the above embodiments.

[0052] The present invention also provides a computer-readable storage medium storing a program or instructions that cause a computer to perform the calibration methods provided in the above embodiments.

[0053] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments.

[0054] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In this application, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0057] The above description is merely an exemplary embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope described in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-device mapping calibration method for production line calibration equipment, characterized in that, include: The measurement values ​​of the preset LED module are acquired using a reference calibration device and at least one device to be calibrated. Using the measurement value of the reference calibration device as the reference measurement value, a linear mapping relationship is established between each of the devices to be calibrated and the reference calibration device, wherein the linear mapping relationship is as follows: ； In the formula, This is the calibration value that is consistent with the reference of the reference calibration device after mapping. The measured values ​​collected by the device to be calibrated. This is the gain coefficient. This is the offset coefficient; Based on the linear mapping relationship, the measured values ​​of the LED module to be calibrated collected by the device to be calibrated are converted into the reference measured values.

2. The calibration method according to claim 1, characterized in that, The measured values ​​include: RGB tristimulus values, and establish the linear mapping relationship for each channel of the RGB tristimulus values ​​respectively.

3. The calibration method according to claim 1, characterized in that, The preset LED module is independent of the LED module to be calibrated, and the number of preset LED modules is not less than 10.

4. The calibration method according to claim 1, characterized in that, The gain coefficient and the offset coefficient Calculated based on the least squares method.

5. The calibration method according to claim 4, characterized in that, The least squares method is calculated as follows: The gain coefficient is calculated using the measurement value of the preset LED module under the device to be calibrated as the independent variable and the measurement value of the preset LED module under the reference calibration device as the dependent variable, through the least squares method. and the offset coefficient .

6. The calibration method according to claim 1, characterized in that, When there are two or more devices to be calibrated, a linear mapping relationship is established between each device to be calibrated and the reference calibration device, and each linear mapping relationship is independent of the others.

7. A multi-device mapping calibration device for production line calibration equipment, applicable to the calibration method according to any one of claims 1 to 6, the calibration device comprising: The acquisition unit is used to acquire the measurement values ​​of each of the preset LED modules through a reference calibration device and at least one device to be calibrated; The mapping relationship construction unit is used to establish linear mapping relationships from each of the devices to be calibrated to the reference calibration device, using the measurement values ​​of the reference calibration device as reference measurement values. The linear mapping relationships are as follows: ； In the formula, This is the calibration value that is consistent with the reference of the reference calibration device after mapping. The measured values ​​collected by the device to be calibrated. This is the gain coefficient. This is the offset coefficient; The conversion unit is used to convert the measured values ​​of the LED module to be calibrated collected by the device to be calibrated into the reference measured values ​​according to the linear mapping relationship.

8. The calibration apparatus according to claim 7, characterized in that, The measured values ​​include RGB tristimulus values, and the linear mapping relationship is established for each channel of the RGB tristimulus values.

9. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor for invoking and executing the computer program to implement the calibration method as described in any one of claims 1 to 6.

10. A computer storage medium, characterized in that, The computer storage medium stores a program or instructions that cause the computer to perform the calibration method as described in any one of claims 1 to 6.

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