A calibration method and system for self-closed-loop pixelated headlamp detection equipment

Abstract

The present invention provides a calibration method and system for a self-closed-loop pixelated headlamp detection device, which belongs to the field of vehicle light control technology. The method includes: setting the exposure mode of an imaging colorimeter to a multiple exposure mode to collect a brightness image of a self-closed-loop pixelated headlamp to be detected; completing the calibration of the headlamp installation position based on the coordinates of the feature points of a pattern with feature points projected by the self-closed-loop pixelated headlamp; performing pixel compensation on the pattern with feature points based on the center coordinate position of the feature points to complete the calibration of the light pattern area of ​​the self-closed-loop pixelated headlamp; using a polynomial fitting to measure the effect of junction temperature on illuminance to complete the calibration of the self-closed-loop pixelated headlamp illuminance. This method solves the problem that the traditional solution cannot accurately identify the light pattern contour due to virtual light and the problem of poor repeatability of illuminance testing.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lamp control, and in particular to a calibration method and system for self-closed-loop pixelated headlamp detection equipment. Background Art

[0002] With the rapid development of the new energy vehicle industry, traditional high and low beam headlights are gradually being replaced by closed-loop pixelated headlights. To ensure road safety and prevent oncoming vehicles from being dazzled by insufficient high beam brightness or excessive brightness, countries have established detailed national standards for headlight brightness and color. As a type of headlight, closed-loop pixelated headlights are also required to comply with corresponding national standards and undergo precise brightness testing before leaving the factory.

[0003] Traditional headlamp pattern detection typically adjusts and detects the light pattern by identifying the low-beam cutoff line. This cutoff line can cause false light, leading to recognition failure. Furthermore, because traditional high and low beams typically operate in either high or low beam mode, the projected pattern has a smooth transition, and its actual range can only be determined by illumination. This carries the same risk of recognition failure or error as the low-beam cutoff line.

[0004] At the same time, traditional headlamp light type testing generally only tests high and low beam types, and its testing time is relatively short, so it does not consider the impact of temperature on the luminous characteristics of its LED. Self-closed-loop pixelated headlamp testing items have more than a dozen test items, and its LED is more sensitive to temperature. Therefore, in order to more accurately measure its illumination, the influence of temperature needs to be considered. Therefore, it is necessary to calibrate the illumination of self-closed-loop pixelated headlamp testing equipment by adding temperature factors. That is, the existing technology has the following defects:

[0005] (1) Traditional light type detection methods may encounter the problem of false light causing recognition failure.

[0006] (2) The LED light intensity of the closed-loop pixelated headlight decreases with increasing temperature, resulting in inaccurate testing.

[0007] The above problems are in urgent need of resolution. Summary of the Invention

[0008] The purpose of the present invention is to overcome at least one technical problem existing in the prior art and to provide a calibration method and system for a self-closed-loop pixelated headlamp detection device.

[0009] On the one hand, an embodiment of the present invention provides a calibration method for a self-closed-loop pixelated headlamp detection device, wherein the self-closed-loop pixelated headlamp detection device includes an imaging colorimeter, a test device, and optical detection software. The calibration method includes: S1: setting the exposure mode of the imaging colorimeter to a multiple exposure mode; S2: collecting a brightness image of the self-closed-loop pixelated headlamp to be detected by the imaging colorimeter; S3: judging by the optical detection software whether the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected collected by the imaging colorimeter meets a preset first condition; S4: in response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected collected by the imaging colorimeter meeting the preset first condition, stopping the collection of the brightness image and going to step S5; S5: installing the self-closed-loop pixelated headlamp to be detected on the test device, and controlling The self-closed-loop pixelated headlamp projects a preset pattern with feature points and uses the imaging colorimeter to capture the pattern with feature points; S6: optical detection software is used to determine whether the coordinates of the corner points of the pattern with feature points meet the preset second condition; S7: in response to the coordinates of the corner points of the pattern with feature points meeting the preset second condition, the self-closed-loop pixelated headlamp installation position is calibrated and the process goes to step S8; S8: the center coordinate position of the feature point in the pattern with feature points is calculated using a centroid algorithm; S9: based on the center coordinate position of the feature point, the pattern with feature points is pixel-compensated to complete the calibration of the light pattern area of ​​the self-closed-loop pixelated headlamp; S10: the steady-state illuminance value of the self-closed-loop pixelated headlamp is measured using a polynomial fitting to measure the influence of junction temperature on illuminance; S11: the calibration of the illuminance of the self-closed-loop pixelated headlamp is completed based on the steady-state illuminance value.

[0010] Furthermore, the step S4: in response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected collected by the imaging colorimeter meeting the preset first condition, stopping the acquisition of the brightness image, and proceeding to step S5 also includes: S401: in response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected collected by the imaging colorimeter not meeting the preset first condition, the optical detection software automatically calculates the exposure coefficient, adjusts the exposure time and detects the signal intensity, and stops the acquisition of the brightness image when the signal intensity meets the preset first condition, and proceeds to step S5.

[0011] Furthermore, the preset first condition includes: the image signal intensity is greater than a preset first intensity threshold and less than a preset second intensity threshold; the step S401 also includes: when the image signal intensity is less than or equal to the preset first intensity threshold or the image signal intensity is greater than or equal to the preset second intensity threshold, the optical detection software automatically calculates the exposure coefficient, adjusts the next exposure time and detects the signal intensity, and stops collecting the brightness image until the signal intensity meets the preset first condition, and goes to step S5.

[0012] Furthermore, the step S6: judging whether the coordinates of the corner points of the pattern with feature points meet the preset second condition through optical detection software includes: S601: obtaining the coordinates of the corner points of the image with feature points by performing image processing on the image with feature points; S602: judging whether the coordinates of the corner points of the pattern with feature points meet the preset second condition.

[0013] Furthermore, the step S601 includes: the pattern with feature points is a 3×3 dot diagram; the coordinates of the four corner points of the 3×3 dot diagram are automatically obtained by the optical detection software, which are (x1, y1), (x2, y2), (x3, y3), and (x4, y4).

[0014] Furthermore, the preset second condition is: |(x2-x1)-(x4-x3)| / [(x2-x1)+(x4-x3) / 2]≤the first threshold; and |(y2-y1)-(y4-y3)| / [(y2-y1)+(y4-y3) / 2]≤the second threshold.

[0015] Furthermore, the step S9 of performing pixel compensation on the pattern with the feature points based on the central coordinate position of the feature points to complete the calibration of the self-closed-loop pixelated headlamp light pattern area includes:

[0016] S901: Enlarge the pattern with feature points horizontally by M / (M-2) times, and enlarge the pattern with feature points vertically by N / (N-2) times, wherein the original pixels of the pattern with feature points are M×N; S902: Use the area indicated by the enlarged pattern with feature points as the actual area of ​​full-frame lighting of the calibrated self-closed-loop pixelated headlight.

[0017] Furthermore, the step S10: using a polynomial to fit the effect of junction temperature on illuminance to measure the steady-state illuminance value of the self-closed-loop pixelated headlamp includes: S1001: continuously lighting the self-closed-loop pixelated headlamp and testing to obtain illuminance under at least four sets of junction temperatures, and obtaining the polynomial as follows:

[0018]

[0019] S1002: Calculating at least four groups of polynomials to obtain polynomial coefficients a1, a2, a3, and a4;

[0020] Where E is the illuminance in Lux, and Tj is the junction temperature in °C.

[0021] Furthermore, the step S10 of measuring the steady-state illuminance value of the self-closed-loop pixelated headlamp by using a polynomial fitting method to determine the effect of junction temperature on illuminance further includes: obtaining the steady-state illuminance value based on the polynomial coefficients, the transient illuminance measured value, and the transient junction temperature, using the following calculation formula:

[0022]

[0023] Where, E steady Expressed as steady-state illuminance value, unit is Lux, Tj real Expressed as transient junction temperature, unit is ℃, Tj steady Expressed as the junction temperature in steady state, in °C, E real It is expressed as the measured value of instantaneous illuminance in Lux, where a1, a2, a3, and a4 are polynomial coefficients.

[0024] In a second aspect, an embodiment of the present application provides a calibration system for a self-closed-loop pixelated headlamp detection device, wherein the calibration system is implemented using the calibration method for the self-closed-loop pixelated headlamp detection device described above. The self-closed-loop pixelated headlamp detection device includes an imaging colorimeter, a test device, and optical detection software. The calibration system includes: an imaging colorimeter setting module, adapted to set the exposure mode of the imaging colorimeter to a multiple exposure mode; a brightness image acquisition module, adapted to acquire a brightness image of the self-closed-loop pixelated headlamp to be detected through the imaging colorimeter; a first judgment module, adapted to determine whether the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected acquired by the imaging colorimeter meets a preset first condition through the optical detection software; an image processing module, adapted to stop acquiring the brightness image in response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected acquired by the imaging colorimeter meeting the preset first condition; a headlamp installation position calibration module. A calibration module is provided, which is adapted to install the self-closed-loop pixelated headlamp to be tested on the test equipment, control the self-closed-loop pixelated headlamp to project a preset pattern with feature points and use the imaging colorimeter to capture the pattern with feature points; determine whether the coordinates of the corner points of the pattern with feature points meet a preset second condition through optical detection software; complete the calibration of the installation position of the self-closed-loop pixelated headlamp in response to the coordinates of the corner points of the pattern with feature points meeting the preset second condition; a headlamp light pattern area calibration module is provided, which is adapted to calculate the center coordinate position of the feature points in the pattern with feature points using a centroid algorithm; pixel-compensate the pattern with feature points based on the center coordinate position of the feature points to complete the calibration of the light pattern area of ​​the self-closed-loop pixelated headlamp; a headlamp illuminance calibration module is provided, which is adapted to measure the steady-state illuminance value of the self-closed-loop pixelated headlamp by using a polynomial fitting to calculate the influence of junction temperature on illuminance; and complete the calibration of the illuminance of the self-closed-loop pixelated headlamp based on the steady-state illuminance value.

[0025] In a third aspect, an embodiment of the present invention further provides an electronic device comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein when the computer program is executed by the processor, the calibration method of the self-closed-loop pixelated headlamp detection device mentioned above is implemented.

[0026] In a fourth aspect, an embodiment of the present invention further provides a readable storage medium, which, when the instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform the calibration method of the above-mentioned self-closed-loop pixelated headlamp detection device.

[0027] The beneficial effects of the present invention are:

[0028] (1) The present invention provides a method for calibrating the installation position and light pattern area of ​​a self-closed-loop pixelated headlamp, which solves the problem that traditional testing schemes cannot accurately identify the light pattern contour due to virtual light.

[0029] (2) The present invention provides a self-closed-loop pixelated headlamp illuminance calibration method, which enables more accurate detection of illuminance and avoids it being affected by test time or temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and examples.

[0031] Figure 1 This is a flow chart of a calibration method for a self-closed-loop pixelated headlamp detection device provided in Example 1 of the present invention.

[0032] Figure 2 This is a schematic diagram of a 3*3 point diagram provided by Example 1 of the present invention.

[0033] Figure 3 This is a schematic diagram of marking the coordinates of corner points of a pattern with characteristic points provided by Example 1 of the present invention.

[0034] Figure 4 This is a structural diagram of a calibration system for a self-closed-loop pixelated headlamp detection device provided in Example 2 of the present invention.

[0035] Figure 5 This is a partial block diagram of an electronic device provided by Example 3 of the present invention. DETAILED DESCRIPTION

[0036] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the various operations as sequential processes, many of the operations therein can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the various operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0037] It should be understood that although the terms "first," "second," and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used solely to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of the exemplary embodiments. The term "and / or" as used herein includes any and all combinations of one or more of the listed associated items.

[0038] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0039] Example 1

[0040] For ease of understanding, the following is an overall description of the inventive concept before describing the embodiments of the present invention in detail:

[0041] This application provides a calibration method and system for a self-closed-loop pixelated headlamp testing device, which includes calibration of the installation position, light pattern area, and illumination. In practical applications, the device calibrates the installation position, light pattern area, and illumination during testing of a self-closed-loop pixelated headlamp. This calibration addresses the issues of traditional solutions, such as the inability to accurately identify light pattern contours due to vignetting, and the poor repeatability of illumination testing.

[0042] The specific implementation is as follows:

[0043] like Figure 1 FIG. 1 is a flow chart of a calibration method for a self-closed-loop pixelated headlamp detection device provided by the present invention.

[0044] As an example, the self-closed-loop pixelated headlamp detection equipment includes an imaging colorimeter, a test equipment and optical detection software, and the calibration method includes: S1: setting the exposure mode of the imaging colorimeter to a multiple exposure mode; S2: collecting a brightness image of the self-closed-loop pixelated headlamp to be detected by the imaging colorimeter; S3: judging by the optical detection software whether the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected collected by the imaging colorimeter meets a preset first condition; S4: in response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected collected by the imaging colorimeter meeting the preset first condition, stopping the collection of the brightness image and going to step S5; S5: installing the self-closed-loop pixelated headlamp to be detected on the test equipment, and controlling the self-closed-loop pixelated headlamp to project a preset band A pattern with characteristic points and capturing the pattern with characteristic points by using the imaging colorimeter; S6: judging whether the coordinates of the corner points of the pattern with characteristic points satisfy a preset second condition by optical detection software; S7: in response to the coordinates of the corner points of the pattern with characteristic points satisfying the preset second condition, completing the calibration of the installation position of the self-closed-loop pixelated headlamp and going to step S8; S8: calculating the central coordinate position of the characteristic point in the pattern with characteristic points by using a centroid algorithm; S9: performing pixel compensation on the pattern with characteristic points based on the central coordinate position of the characteristic point to complete the calibration of the light pattern area of ​​the self-closed-loop pixelated headlamp; S10: measuring the steady-state illuminance value of the self-closed-loop pixelated headlamp by using a polynomial fitting to determine the influence of junction temperature on illuminance; S11: completing the calibration of the illuminance of the self-closed-loop pixelated headlamp based on the steady-state illuminance value. By calibrating the installation position of the headlamp, calibrating the light pattern area and calibrating the contrast during the self-closed-loop pixelated headlamp testing process of the testing equipment, the problems of the traditional solution that the light pattern contour cannot be accurately identified due to the virtual light and the poor repeatability of the illumination test are solved.

[0045] In some feasible embodiments, step S4: in response to the image signal intensity of the luminance image of the self-closed-loop pixelated headlamp to be inspected, captured by the imaging colorimeter, satisfying a preset first condition, stopping luminance image acquisition, and proceeding to step S5 further includes: S401: in response to the image signal intensity of the luminance image of the self-closed-loop pixelated headlamp to be inspected, captured by the imaging colorimeter, not satisfying the preset first condition, the optical inspection software automatically calculating an exposure factor, adjusting the exposure time, and detecting the signal intensity until the signal intensity satisfies the preset first condition, then stopping luminance image acquisition, and proceeding to step S5. The preset first condition includes: the image signal intensity is greater than a preset first intensity threshold and less than a preset second intensity threshold; step S401 further includes: when the image signal intensity is less than or equal to the preset first intensity threshold or the image signal intensity is greater than or equal to the preset second intensity threshold, the optical inspection software automatically calculating the exposure factor, adjusting the next exposure time, and detecting the signal intensity until the signal intensity satisfies the preset first condition, then stopping luminance image acquisition, and proceeding to step S5. Specifically, the exposure mode of the imaging colorimeter is set to a multiple exposure mode. The basic principle of automated testing equipment is that an imaging colorimeter captures luminance images, performs image processing to obtain corresponding test values, and then determines the conformity of the test sample based on these values. Because closed-loop pixelated headlights have a wide brightness range, setting the imaging colorimeter's exposure time to multiple exposure mode allows the testing equipment to automatically adjust the exposure time to meet the testing requirements of closed-loop pixelated headlights with varying brightness levels. Ensure that the image signal intensity is around 80% each time. Specific operation: When the signal intensity captured during the first preset exposure time exceeds 100% (the second intensity threshold) or falls below 70% (the first intensity threshold), the optical inspection software automatically calculates the corresponding exposure factor, adjusts the second exposure time, and measures the signal intensity. If the signal intensity is between 70% and 100%, acquisition stops and image processing begins. If the signal intensity exceeds 100% or falls below 70%, the software automatically calculates the corresponding exposure factor, adjusts the third exposure time, and measures the signal intensity. Acquisition stops and image processing begins until the signal intensity is between 70% and 100%. In other words, by setting the imaging colorimeter's exposure mode to multiple exposure mode, the uniformity of the brightness images captured by the imaging colorimeter across different brightness ranges is ensured, laying the foundation for subsequent image processing and calibration. It should be noted that the first and second intensity thresholds are not limited herein, and relevant technical personnel may modify their specific values ​​based on actual needs.

[0046] In some feasible implementations, the step S6: determining whether the coordinates of the corner points of the pattern with the feature points meet the preset second condition through optical detection software includes: S601: obtaining the coordinates of the corner points of the image with the feature points by performing image processing on the image with the feature points; S602: determining whether the coordinates of the corner points of the pattern with the feature points meet the preset second condition. Figure 2-3 As shown, taking a 3×3 dot diagram as an example of a pattern with feature points, the step S601 includes: the pattern with feature points is a 3×3 dot diagram; the coordinates of the four corner points of the 3×3 dot diagram are automatically obtained by the optical detection software, and are (x1, y1), (x2, y2), (x3, y3), and (x4, y4). The preset second condition is: |(x2-x1)-(x4-x3)| / [(x2-x1)+(x4-x3) / 2]≤the first threshold; and |(y2-y1)-(y4-y3)| / [(y2-y1)+(y4-y3) / 2]≤the second threshold. Among them, the first threshold and the second threshold are preferably 0.01. Specifically, since the self-closed-loop pixelated headlight can project any pattern that meets the resolution requirements, it can project a pattern with feature points (such as Figure 2 , that is, a 3*3 dot diagram, where each lit dot consists of 9 pixels) is used to calibrate the installation position and light type area. The sample to be tested is installed on the test equipment, the 3×3 dot diagram is lit, and the image is captured using an imaging colorimeter, and then image processing is performed. The coordinates of the four corner points of the image are (x1, y1), (x2, y2), (x3, y3), and (x4, y4), see Figure 3 If |(x2-x1)-(x4-x3)| / [(x2-x1)+(x4-x3) / 2]>the first threshold, the headlamp tilt angle is too large and needs to be adjusted. If |(y2-y1)-(y4-y3)| / [(y2-y1)+(y4-y3) / 2]>the second threshold, the headlamp rotation angle is too large and needs to be adjusted. If both values ​​are less than or equal to the corresponding first and second thresholds, the headlamp installation meets the requirements and subsequent testing can be performed.

[0047] In some feasible embodiments, step S9: performing pixel compensation on the pattern with feature points based on the center coordinate positions of the feature points to complete the calibration of the self-closed-loop pixelated headlamp light pattern area includes: S901: expanding the pattern with feature points horizontally by M / (M-2) times and vertically by N / (N-2) times, wherein the original pixels of the pattern with feature points are M×N; S902: using the area indicated by the expanded pattern with feature points as the actual area of ​​the calibrated self-closed-loop pixelated headlamp full-frame illumination. Specifically, image processing is continued on the image captured by the above-mentioned 3×3 dot map, and the center coordinate positions of the 9 points on the image are calculated using a centroid algorithm, thereby obtaining the edge positions of the 3×3 dot map. If the full-frame pixels of the self-closed-loop pixelated headlamp are M×N, the pixels occupied by the area formed by connecting the coordinates of the points calculated using the centroid or centroid algorithm are (M-2)×(N-2). The pattern is expanded horizontally by a factor of M / (M-2) and vertically by a factor of N / (N-2). This area represents the actual illuminated area of ​​the self-closed-loop pixelated headlight. This allows for faster calculation of test values ​​for subsequent measurement items, such as 0.3 and 0.5 fields of view, solving the challenge of contour capture in certain optical test items.

[0048] In some feasible embodiments, step S10: using a polynomial to fit the effect of junction temperature on illuminance to measure the steady-state illuminance value of the self-closed-loop pixelated headlamp includes: S1001: continuously lighting the self-closed-loop pixelated headlamp and testing to obtain illuminance at at least four sets of junction temperatures, and obtaining the polynomial as follows:

[0049]

[0050] S1002: Calculate the polynomial coefficients a1, a2, a3, and a4 by performing calculations on at least four sets of polynomials; where E represents illuminance in Lux, and Tj represents junction temperature in °C. Specifically, the relative luminous intensity of the self-closed-loop pixelated headlamp LED is related to the junction temperature, and the luminous intensity gradually decreases as the junction temperature rises. If it is assumed that the junction temperature Tj is related to the relative luminous intensity I / I 25℃ The relationship is I / I 25℃ =a1Tj 3 +a2Tj 2 +a3Tj+a4, where a1, a2, a3, and a4 are polynomial coefficients. Since illuminance E is proportional to luminous intensity I, that is, E=kI, then E / E 25℃ =a1Tj 3 +a2Tj 2+a3Tj+a4. In order to unify the evaluation standards, the general illuminance test needs to test the steady-state value of the light source, that is, the value after 30 minutes. When testing on the actual detection equipment, it cannot be performed due to the test cycle. According to the above calibration method, the steady-state illuminance value of each self-closed-loop pixelated headlight module is compared with a certain transient illuminance measured value E real and transient junction temperature Tj real The relationship is

[0051]

[0052] where Tj steady The junction temperature in steady state is obtained by testing during the calibration of the test equipment. Therefore, when testing each self-closed-loop pixel lamp on the test equipment, only E real and Tj real , the steady-state illumination value E can be calculated by software steady This allows for more accurate measurement of the illuminance of closed-loop pixelated headlights, eliminating temperature influences. It also improves the repeatability of illuminance-related test items such as Emax and stray light.

[0053] In the above-mentioned embodiment, the calibration of the self-closed-loop pixelated headlamp testing equipment includes calibration of the installation position, calibration of the light pattern area, and calibration of the illuminance, to address the problem of traditional solutions being unable to accurately identify the light pattern contour due to vignetting and the problem of poor repeatability in illuminance testing. The exposure mode of the testing equipment is set to a multiple exposure mode to match self-closed-loop pixelated headlamps of different brightness. The accuracy of the final test result is further ensured by using the corner points of a pattern with feature points projected by the headlamp to determine whether the self-closed-loop pixelated headlamp is installed rotated or tilted. The center coordinate position of the feature points on the image is calculated using a centroid algorithm to achieve calibration of the light pattern area, solving the problem of contour capture for certain optical test items. By using a polynomial to fit the effect of junction temperature on illuminance, the steady-state illuminance value of the self-closed-loop pixelated headlamp can be quickly measured, effectively improving the test repeatability of illuminance-related test items such as Emax and stray light.

[0054] Example 2

[0055] See also Figure 4 , this embodiment provides a schematic diagram of the calibration system structure of a self-closed-loop pixelated headlamp detection device.

[0056] As an example, the calibration system is implemented using the calibration method of the self-closed-loop pixelated headlamp testing device described in Example 1. The self-closed-loop pixelated headlamp testing device includes an imaging colorimeter, test equipment, and optical testing software. The calibration system includes:

[0057] The imaging colorimeter setting module 410 is adapted to set the exposure mode of the imaging colorimeter to a multiple exposure mode.

[0058] The brightness image acquisition module 420 is adapted to acquire a brightness image of the self-closed-loop pixelated headlamp to be inspected using the imaging colorimeter.

[0059] The first judgment module 430 is adapted to judge, through the optical detection software, whether the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected, collected by the imaging colorimeter, meets a preset first condition.

[0060] The image processing module 440 is adapted to stop acquiring the brightness image in response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected acquired by the imaging colorimeter meeting a preset first condition.

[0061] The headlamp installation position calibration module 450 is suitable for installing the self-closed-loop pixelated headlamp to be tested on the test equipment, controlling the self-closed-loop pixelated headlamp to project a preset pattern with feature points and using the imaging colorimeter to capture the pattern with feature points; judging whether the corner point coordinates of the pattern with feature points meet the preset second condition through optical detection software; and completing the calibration of the self-closed-loop pixelated headlamp installation position in response to the corner point coordinates of the pattern with feature points meeting the preset second condition.

[0062] The headlamp light pattern area calibration module 460 is adapted to calculate the center coordinate position of the feature point in the pattern with the feature point using a centroid algorithm; perform pixel compensation on the pattern with the feature point based on the center coordinate position of the feature point to complete the calibration of the self-closed-loop pixelated headlamp light pattern area.

[0063] The headlamp illumination calibration module 470 is adapted to measure the steady-state illumination value of the self-closed-loop pixelated headlamp using a polynomial fitting to determine the effect of junction temperature on illumination; and to calibrate the illumination of the self-closed-loop pixelated headlamp based on the steady-state illumination value.

[0064] It is not difficult to find that this embodiment is a system embodiment corresponding to the first embodiment, and this embodiment can be implemented in conjunction with the first embodiment. The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the first embodiment.

[0065] It is worth noting that all modules involved in this embodiment are logical units. In actual applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. Furthermore, to highlight the innovations of this invention, this embodiment does not include units that are not closely related to solving the technical problems proposed by this invention. However, this does not mean that other units do not exist in this embodiment.

[0066] Example 3

[0067] See also Figure 5 An embodiment of the present invention further provides an electronic device, comprising: a memory and a processor; the memory stores at least one program instruction; the processor implements the calibration method of the self-closed-loop pixelated headlamp detection device provided in Example 1 by loading and executing the at least one program instruction.

[0068] The memory 702 and processor 701 are connected using a bus. The bus can include any number of interconnected buses and bridges, connecting various circuits of one or more processors 701 and memory 702. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits. These are all well known in the art and, therefore, will not be described further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be a single component or multiple components, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by the processor 701 is transmitted over a wireless medium via an antenna. Furthermore, the antenna receives data and transmits it to the processor 701.

[0069] The processor 701 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory 702 can be used to store data used by the processor 701 when performing operations.

[0070] Example 4

[0071] An embodiment of the present invention further provides a storage medium storing a calibration method for a self-closed-loop pixelated headlamp testing device. When executed by a processor, the calibration program for the self-closed-loop pixelated headlamp testing device implements the steps of the calibration method for the self-closed-loop pixelated headlamp testing device described above. Because this storage medium incorporates all the technical solutions of all the aforementioned embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and therefore will not be further elaborated upon here.

[0072] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A calibration method for a self-closed-loop pixelated headlamp testing device, wherein the self-closed-loop pixelated headlamp testing device comprises an imaging colorimeter, a test device, and optical testing software, characterized in that: The calibration method comprises: S1: Setting the exposure mode of the imaging colorimeter to a multiple exposure mode; S2: collecting a brightness image of the self-closed-loop pixelated headlamp to be inspected by the imaging colorimeter; S3: Determining, by the optical detection software, whether the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected, collected by the imaging colorimeter, meets a preset first condition, wherein the preset first condition includes: the image signal intensity is greater than a preset first intensity threshold and less than a preset second intensity threshold; S4: In response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected, which is collected by the imaging colorimeter, meeting a preset first condition, stopping the collection of the brightness image and proceeding to step S5; S5: installing the self-closed-loop pixelated headlamp to be tested on the test equipment, controlling the self-closed-loop pixelated headlamp to project a preset pattern with characteristic points, and using the imaging colorimeter to capture the pattern with characteristic points; S6: Determining whether the coordinates of the corner points of the pattern with the feature points meet a preset second condition by optical detection software, including: S601: Obtaining the coordinates of the corner points of the image with the feature points by performing image processing on the image with the feature points, including: the pattern with the feature points is a 3×3 dot diagram; automatically obtaining the coordinates of the four corner points of the 3×3 dot diagram by the optical detection software, respectively 、 、 、 ; S602: Determine whether the coordinates of the corner points of the pattern with the feature points meet a preset second condition; The second preset condition is: a first threshold; and second threshold; S7: In response to the coordinates of the corner points of the pattern with the characteristic points satisfying the preset second condition, completing the calibration of the self-closed-loop pixelated headlamp installation position and proceeding to step S8; S8: Calculate the center coordinate position of the feature point in the pattern with the feature point using a centroid algorithm; S9: performing pixel compensation on the pattern with the feature points based on the central coordinate position of the feature points to complete the calibration of the self-closed-loop pixelated headlamp light pattern area; S10: The steady-state illuminance value of the self-closed-loop pixelated headlamp is measured using a polynomial fitting of the effect of junction temperature on illuminance. S11: completing calibration of the self-closed-loop pixelated headlamp illumination based on the steady-state illumination value.

2. The calibration method of the self-closed-loop pixelated headlamp detection equipment according to claim 1, characterized in that: Step S4: in response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected collected by the imaging colorimeter meeting a preset first condition, stopping the collection of the brightness image and proceeding to step S5; Also includes: S401: In response to the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be inspected, which is collected by the imaging colorimeter, not satisfying a preset first condition, the optical inspection software automatically calculates the exposure factor, adjusts the exposure time, and detects the signal intensity until the signal intensity satisfies the preset first condition, stops collecting the brightness image, and proceeds to step S5.

3. The calibration method of the self-closed-loop pixelated headlamp detection equipment according to claim 2, characterized in that: The step S401 also includes: when the image signal intensity is less than or equal to a preset first intensity threshold or the image signal intensity is greater than or equal to a preset second intensity threshold, the optical detection software automatically calculates the exposure coefficient, adjusts the next exposure time and detects the signal intensity until the signal intensity meets the preset first condition, stops collecting the brightness image, and goes to step S5.

4. The calibration method of the self-closed-loop pixelated headlamp detection device according to claim 1, characterized in that: The step S9 of performing pixel compensation on the pattern with the feature points based on the central coordinate position of the feature points to complete the calibration of the self-closed-loop pixelated headlamp light pattern area includes: S901: Enlarging the pattern with the feature points by M / (M-2) times in the horizontal direction and by N / (N-2) times in the vertical direction, wherein the original pixel size of the pattern with the feature points is M×N; S902: Using the area indicated by the enlarged pattern with the characteristic points as the actual area of ​​the calibrated full-frame illuminated self-closed-loop pixelated headlight.

5. The calibration method of the self-closed-loop pixelated headlamp detection equipment according to claim 1, characterized in that: The step S10 of measuring the steady-state illuminance value of the self-closed-loop pixelated headlamp by using a polynomial fitting to determine the effect of junction temperature on illuminance includes: S1001: Continuously illuminate the self-closed-loop pixelated headlamp and test to obtain illumination at at least four sets of junction temperatures, and obtain the polynomial: ； ； ； ； S1002: Obtain polynomial coefficients by calculating at least four groups of polynomials 、 、 and ; Where, E represents the illumination, the unit is Lux, Expressed as junction temperature in °C.

6. The calibration method of the self-closed-loop pixelated headlamp detection device according to claim 5, characterized in that: The step S10 of measuring the steady-state illuminance value of the self-closed-loop pixelated headlamp by using a polynomial fitting to determine the effect of junction temperature on illuminance also includes: The steady-state illuminance value is obtained based on the polynomial coefficients, the transient illuminance measured value and the transient junction temperature. The calculation formula is: ； Where, Expressed as steady-state illuminance value, unit is Lux, Expressed as transient junction temperature in °C, Expressed as the junction temperature in steady state, in °C, It is expressed as the measured value of instantaneous illuminance in Lux. 、 、 and are the polynomial coefficients.

7. A calibration system for a self-closed-loop pixelated headlamp detection device, characterized in that: The calibration system is implemented using the calibration method of the self-closed-loop pixelated headlamp testing device according to any one of claims 1 to 6. The self-closed-loop pixelated headlamp testing device includes an imaging colorimeter, a test device, and optical testing software. The calibration system includes: an imaging colorimeter setting module, adapted to set the exposure mode of the imaging colorimeter to a multiple exposure mode; a brightness image acquisition module, adapted to acquire a brightness image of the self-closed-loop pixelated headlamp to be inspected using the imaging colorimeter; a first judgment module, adapted to judge, by the optical detection software, whether the image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected, collected by the imaging colorimeter, meets a preset first condition; an image processing module, adapted to stop acquiring the brightness image in response to an image signal intensity of the brightness image of the self-closed-loop pixelated headlamp to be detected, acquired by the imaging colorimeter, satisfying a preset first condition; a headlamp mounting position calibration module adapted to mount the self-closed-loop pixelated headlamp to be tested on the test equipment, control the self-closed-loop pixelated headlamp to project a preset pattern with characteristic points, and capture the pattern with characteristic points using the imaging colorimeter; determine, using optical detection software, whether the coordinates of corner points of the pattern with characteristic points satisfy a preset second condition; and complete the calibration of the mounting position of the self-closed-loop pixelated headlamp in response to the coordinates of corner points of the pattern with characteristic points satisfying the preset second condition; a headlamp light pattern area calibration module adapted to calculate the central coordinate positions of feature points in the pattern with feature points using a centroid algorithm; and to perform pixel compensation on the pattern with feature points based on the central coordinate positions of the feature points to complete the self-closed-loop pixelated headlamp light pattern area calibration; The headlamp illuminance calibration module is suitable for measuring the steady-state illuminance value of the self-closed-loop pixelated headlamp by using a polynomial fitting to measure the influence of junction temperature on illuminance; and completing the calibration of the self-closed-loop pixelated headlamp illuminance based on the steady-state illuminance value.

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