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

Abstract

The invention provides a calibration method and system for self-closed-loop pixelated headlamp detection equipment, and belongs to the technical field of vehicle lamp control. The method comprises the following steps: setting an exposure mode of an imaging colorimeter as a multi-exposure mode to collect a brightness image of a to-be-detected self-closed-loop pixelated headlamp; completing the calibration of the installation position of the headlamp based on the coordinates of the feature points of the pattern with the feature points projected by the self-closed-loop pixelated headlamp; pixel compensation is carried out on the pattern with the feature points on the basis of the center coordinate positions of the feature points, and then calibration of a self-closed-loop pixelated headlamp light type area is completed; and measuring the steady-state illumination value of the self-closed-loop pixelated headlamp by using the influence of polynomial fitting junction temperature on illumination to complete the calibration of the illumination of the self-closed-loop pixelated headlamp. The problems that the light type contour cannot be accurately identified due to virtual light and the repeatability of illumination test is poor in the traditional scheme are solved.

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 a self-closed-loop pixelated headlamp detection device. Background Art

[0002] With the rapid development of the new energy vehicle industry, traditional high and low beam headlights are gradually being replaced by self-closed loop pixelated headlights. In order to ensure road safety and avoid the problem of insufficient high beam brightness or excessive brightness causing dazzle to oncoming vehicles, various countries have formulated detailed national standards for the brightness and color of headlights. As a type of headlight, self-closed loop pixelated headlights also need to comply with the corresponding national standards and conduct accurate brightness testing before leaving the factory.

[0003] Traditional headlamp light pattern detection generally achieves light pattern adjustment and detection by identifying the low beam cutoff line. On the one hand, the low beam cutoff line may have a problem of false light causing recognition failure. On the other hand, since the traditional high and low beams are generally lit in high beam or low beam mode, the edge of the projected pattern is a smooth transition, and its actual range can only be determined by illumination. Like the low beam cutoff line, there is a risk of recognition failure or recognition error.

[0004] At the same time, the traditional headlamp light type detection generally only detects the high and low beam light types, and the detection time is short, so it does not consider the influence of temperature on the luminous characteristics of its LED. The detection items of self-closed-loop pixelated headlamps have more than a dozen detection items, and its LED is more sensitive to the influence of temperature. Therefore, in order to measure its illumination more accurately, it is necessary to consider the influence of temperature. Therefore, it is necessary to calibrate the illumination of self-closed-loop pixelated headlamp test equipment by adding temperature factors. That is, there are the following defects in the prior art:

[0005] (1) Traditional light type detection methods may encounter problems such as false light, which may lead to recognition failure.

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

[0007] The above problems need to be solved urgently. 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, 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 device, and controlling The self-closed-loop pixelated headlamp projects a preset pattern with feature points and uses the imaging colorimeter to collect the pattern with feature points; S6: judge whether the corner point coordinates of the pattern with feature points meet the preset second condition through optical detection software; S7: in response to the corner point coordinates of the pattern with feature points meeting the preset second condition, complete the calibration of the installation position of the self-closed-loop pixelated headlamp and go to step S8; S8: use the centroid algorithm to calculate the central coordinate position of the feature point in the pattern with feature points; S9: based on the central coordinate position of the feature point, the pattern with feature points is pixel-compensated to complete the calibration of the light type area of ​​the self-closed-loop pixelated headlamp; S10: use a polynomial fitting to measure the influence of junction temperature on illuminance to obtain the steady-state illuminance value of the self-closed-loop pixelated headlamp; S11: complete the calibration of the illumination of the self-closed-loop pixelated headlamp 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 collection of the brightness image, and going 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 factor, adjusts the exposure time and detects the signal intensity, and stops the collection of the brightness image when the signal intensity meets the preset first condition, and goes 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 factor, 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.

[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] Further, 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: 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] Further, 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:

[0018]

[0019] S1002: Obtain polynomial coefficients a1, a2, a3 and a4 by calculating at least four groups of polynomials;

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

[0021] 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 also includes: obtaining a steady-state illuminance value based on the polynomial coefficient, the transient illuminance measured value and the transient junction temperature, and the calculation formula is:

[0022]

[0023] In the formula, E steady Expressed as steady-state illuminance value, unit is Lux, Tj real Expressed as transient junction temperature in °C, Tj steady It is the junction temperature in steady state, in °C, E real It is expressed as the measured value of instantaneous illuminance in Lux, and 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, wherein the self-closed-loop pixelated headlamp detection device includes an imaging colorimeter, a test device, and optical detection software, and 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 a self-closed-loop pixelated headlamp to be detected through the imaging colorimeter; a first judgment module, adapted to determine whether the image signal strength 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 strength 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 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 collect 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; in response to the corner point coordinates of the pattern with feature points meeting the preset second condition, completing the calibration of the installation position of the self-closed-loop pixelated headlamp; a headlamp light pattern area calibration module is provided, which is suitable for calculating the central coordinate position of the feature points in the pattern with feature points using a centroid algorithm; performing pixel compensation on the pattern with feature points based on the central coordinate position of the feature points to complete the calibration of the light pattern area of ​​the self-closed-loop pixelated headlamp; a headlamp illumination calibration module is provided, which is suitable for measuring the steady-state illumination value of the self-closed-loop pixelated headlamp by fitting the influence of junction temperature on illumination using a polynomial; and completing the calibration of the illumination of the self-closed-loop pixelated headlamp based on the steady-state illumination 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 in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the calibration method of the above-mentioned self-closed-loop pixelated headlight detection device.

[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 execute 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 type area of ​​a self-closed-loop pixelated headlamp, which solves the problem that the traditional test scheme cannot accurately identify the light type contour due to virtual light.

[0029] (2) The present invention provides a self-closed-loop pixelated headlamp illumination calibration method, which enables the illumination to be detected more accurately and avoids being affected by the test time or temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[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 It is a schematic diagram of marking the coordinates of corner points of a pattern with feature points provided in Example 1 of the present invention.

[0034] Figure 4 It is a structural schematic diagram of a calibration system of 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 in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0036] It should be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations as sequential processes, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of the 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", etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are used only to distinguish one unit from another unit. For example, without departing from the scope of the exemplary embodiments, the first unit may be referred to as the second unit, and similarly the second unit may be referred to as the first unit. The term "and / or" 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 inventive concept is generally described below before describing the embodiments of the present invention in detail:

[0041] The present application provides a calibration method and system for a self-closed-loop pixelated headlamp detection device, which includes calibration of the installation position, calibration of the light pattern area, and calibration of the illumination. In actual application, the installation position is calibrated, the light pattern area is calibrated, and the illumination is calibrated respectively during the detection of the self-closed-loop pixelated headlamp by the detection device. The calibration of the detection device can solve the problem that the traditional solution cannot accurately identify the light pattern contour due to virtual light and the problem of poor repeatability of illumination test.

[0042] The specific implementation is as follows:

[0043] like Figure 1 As shown, it is a flow chart of a calibration method of 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 an 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 feature points and using the imaging colorimeter to collect the pattern with feature points; S6: judging whether the corner point coordinates of the pattern with feature points meet the preset second condition through optical detection software; S7: in response to the corner point coordinates of the pattern with feature points meeting the preset second condition, completing the calibration of the installation position of the self-closed-loop pixelated headlamp and turning to step S8; S8: using the centroid algorithm to calculate the central coordinate position of the feature point in the pattern with feature points; S9: based on the central coordinate position of the feature point, the pattern with feature points is pixel-compensated to complete the calibration of the light type area of ​​the self-closed-loop pixelated headlamp; S10: using a polynomial fitting to measure the influence of junction temperature on illumination to obtain the steady-state illuminance value of the self-closed-loop pixelated headlamp; S11: completing the calibration of the illumination of the self-closed-loop pixelated headlamp based on the steady-state illuminance value. By calibrating the installation position of the headlamp, the light type area and the illumination during the self-closed-loop pixelated headlamp detection process of the detection equipment, the problem of the traditional solution being unable to accurately identify the light type contour due to virtual light and the poor repeatability of the illumination test can be solved.

[0045] In some feasible implementations, 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 going to step S5 further 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, until the signal intensity meets the preset first condition, the acquisition of the brightness image is stopped, and the step S5 is turned to. Wherein, the preset first condition includes: the image signal intensity is greater than the preset first intensity threshold and less than the 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, until the signal intensity meets the preset first condition, the acquisition of the brightness image is stopped, and the step S5 is turned to. Specifically, the exposure mode of the imaging colorimeter is set to the multiple exposure mode. The basic principle of the automated testing equipment is that the imaging colorimeter collects brightness images, performs image processing to obtain the corresponding test values, and judges whether the test sample is qualified based on the test values. Since the brightness range of the self-closed-loop pixelated headlight is large, the exposure time of the imaging colorimeter is set to the multiple exposure mode, so that the testing equipment can automatically adjust the exposure time to meet the test requirements of self-closed-loop pixelated headlights with different brightness. Ensure that the image signal intensity is around 80% each time. Specific operation: When the signal intensity collected by the first preset exposure time exceeds 100% (the second intensity threshold) or is lower than 70% (the first intensity threshold), the optical detection software automatically calculates the corresponding exposure coefficient, adjusts the second exposure time and detects the signal intensity. If the signal intensity is between 70% and 100%, stop collecting and start image processing. If the signal intensity exceeds 100% or is lower than 70%, the software automatically calculates the corresponding exposure coefficient, adjusts the third exposure time and detects the signal intensity until the signal intensity is between 70%-100%, stop collecting and start image processing. That is, by setting the exposure mode of the imaging colorimeter to the multiple exposure mode, the uniformity of the brightness images collected by the imaging colorimeter in different brightness ranges is ensured, which lays the foundation for subsequent image processing and calibration. It should be noted that there is no restriction on the first intensity threshold and the second intensity threshold, and relevant technical personnel can change their specific values ​​based on actual needs.

[0046] In some feasible implementations, the step S6: judging whether the coordinates of the corners of the pattern with feature points meet the preset second condition by optical detection software includes: S601: obtaining the coordinates of the corners of the image with feature points by performing image processing on the image with feature points; S602: judging whether the coordinates of the corners of the pattern with 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, 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 respectively (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, each lit dot consists of 9 pixels) to calibrate the installation position and light type area. Install the sample to be tested on the test equipment, light up the 3×3 dot diagram and use an imaging colorimeter to capture the image, and then perform image processing. 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, it means that the headlight installation tilt angle is too large and needs to be adjusted. If |(y2-y1)-(y4-y3)| / [(y2-y1)+(y4-y3) / 2]>the second threshold, it means that the headlight installation rotation angle is too large and needs to be adjusted. If both are less than or equal to the corresponding first and second thresholds, it is said that the headlight installation meets the requirements and subsequent tests can be carried out.

[0047] In some feasible implementations, the step S9: based on the central coordinate position of the feature point, the pattern with the feature point is pixel-compensated to complete the calibration of the self-closed-loop pixelated headlamp light type area, including: S901: expanding the pattern with the feature point in the horizontal direction by M / (M-2) times, and expanding the pattern with the feature point in the vertical direction by N / (N-2) times, wherein the original pixel of the pattern with the feature point is M×N; S902: using the area shown by the enlarged pattern with the feature point as the actual area of ​​the calibrated self-closed-loop pixelated headlamp full-frame lighting. Specifically, continue to perform image processing on the image captured by the above 3×3 dot map, use the centroid algorithm to calculate the central coordinate position of the 9 points on the image, and then the edge position of the 3×3 dot map can be obtained. If the full-frame pixel of the self-closed-loop pixelated headlamp is M×N, the pixels occupied by the area connected by the coordinates of the points calculated using the centroid or centroid algorithm are (M-2)×(N-2). The pattern is enlarged by M / (M-2) times in the horizontal direction and N / (N-2) times in the vertical direction, and its area is the actual area where the self-closed-loop pixelated headlight is fully lit. Based on this, the corresponding test values ​​of subsequent measurement items such as 0.3 field of view and 0.5 field of view can be calculated more quickly, solving the problem of contour capture of some optical test items.

[0048] In some feasible implementations, 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:

[0049]

[0050] S1002: Calculate at least four sets of polynomials to obtain polynomial coefficients a1, a2, a3 and a4; 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 therefore assumed that the junction temperature Tj is related to the relative luminous intensity I / I 25℃ The relationship is I / I 25℃ =a1Tj 3 +a2T 2 +a3Tj+a4, where a1, a2, a3, and a4 are polynomial coefficients. Since the illuminance E is proportional to the luminous intensity I, that is, E=kI, then E / E 25℃ =a1Tj 3 +a2T 2+a3Tj+a4. In order to unify the evaluation standards, the general illumination 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 illumination value of each self-closed-loop pixelized headlight module is compared with a certain transient illumination measured value E real and transient junction temperature Tj real The relationship is

[0051]

[0052] Where Tj steady is the junction temperature in steady state, which is obtained by testing when the test equipment is calibrated. Therefore, when testing each self-closed-loop pixel lamp on the test equipment, only E needs to be measured. real and Tj real , the steady-state illumination value E can be calculated by software steady This allows for more accurate detection of the illumination value of closed-loop pixelated headlights, avoiding the effects of temperature. It also improves the repeatability of illumination-related test items such as Emax and stray light.

[0053] In the above embodiment, the calibration of the self-closed-loop pixelated headlamp detection device includes the calibration of the installation position, the calibration of the light type area and the calibration of the illumination, so as to solve the problem that the traditional solution cannot accurately identify the light type contour due to the virtual light and the problem of poor repeatability of the illumination test. By setting the exposure mode of the detection device to the multiple exposure mode, it is possible to match the self-closed-loop pixelated headlamp of different brightness. By using the corner points of the pattern with feature points projected by the headlamp to determine whether the installation of the self-closed-loop pixelated headlamp is rotated or tilted, the accuracy of the final detection result is further guaranteed. The center coordinate position of the feature point on the image is calculated by the centroid algorithm to realize the calibration of the light type area, solving the problem of contour capture of certain optical test items. By using a polynomial to fit the effect of junction temperature on illumination, the steady-state illumination value of the self-closed-loop pixelated headlamp can be quickly measured, effectively improving the test repeatability of illumination-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 by using the calibration method of the self-closed-loop pixelated headlamp detection device described in Example 1, wherein the self-closed-loop pixelated headlamp detection device includes an imaging colorimeter, a test device, and optical detection software, and 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 through 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 collecting the brightness image 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.

[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 collect 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 central coordinate position of the feature point in the pattern with the feature point using a centroid algorithm; and to perform pixel compensation on the pattern with the feature point based on the central 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 by using a polynomial fitting to measure the effect of junction temperature on illumination; and to complete the calibration of the self-closed-loop pixelated headlamp illumination 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 in order to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied in the first embodiment.

[0065] It is worth mentioning that all modules involved in this embodiment are logical units. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, this embodiment does not introduce units that are not closely related to solving the technical problem proposed by the present invention, but this does not mean that there are no other units 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 headlight detection device provided in Example 1 by loading and executing the at least one program instruction.

[0068] The memory 702 and the processor 701 are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors 701 and the memory 702 together. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on a transmission medium. The data processed by the processor 701 is transmitted on a wireless medium via an antenna, and further, the antenna also receives data and transmits the data 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] The embodiment of the present invention further provides a storage medium, on which a calibration method of a self-closed-loop pixelated headlamp detection device is stored, and when the calibration program of the self-closed-loop pixelated headlamp detection device is executed by a processor, the steps of the calibration method of the self-closed-loop pixelated headlamp detection device described above are implemented. Since the storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0072] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can know all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant 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 deformations and improvements can be made, which should also be regarded as the scope of protection of the present invention, which 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, the self-closed-loop pixelated headlamp testing device comprising 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 using 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; 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 going 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 collect the pattern with characteristic points; S6: Determine, by optical detection software, whether the coordinates of the corner points of the pattern with the feature points meet a preset second condition; 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 installation position of the self-closed-loop pixelated headlamp and turning to step S8; S8: Calculate the central 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 by using a polynomial fitting to measure 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 device according to claim 1, characterized in that: 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 a preset first condition, stopping the collection of the brightness image, and proceeding to step S5 further includes: S401: 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 not satisfying a preset first condition, the optical detection software automatically calculates the exposure factor, adjusts the exposure time and detects the signal intensity until the signal intensity satisfies the preset first condition, then stops acquiring the brightness image and proceeds to step S5.

3. The calibration method of the self-closed-loop pixelated headlamp detection device according to claim 2, characterized in that: The preset first condition includes: the image signal strength is greater than a preset first strength threshold and less than a preset second strength threshold; 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 factor, 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 proceeds 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 S6: judging whether the coordinates of the corner points of the pattern with the feature points meet the preset second condition by optical detection software includes: S601: Obtaining the coordinates of corner points of the image with the feature points by performing image processing on the image with the feature points; S602: Determine whether the coordinates of the corner points of the pattern with the feature points meet a preset second condition.

5. The calibration method of the self-closed-loop pixelated headlamp detection device according to claim 4, characterized in that: The step S601 includes: The pattern with characteristic points is a 3×3 point map; The coordinates of the four corner points of the 3×3 dot diagram automatically obtained by the optical detection software are (x1, y1), (x2, y2), (x3, y3), and (x4, y4).

6. The calibration method of the self-closed-loop pixelated headlamp detection device according to claim 5, characterized in that: The preset second condition is: |(x2-x1)-(x4-x3)| / [(x2-x1)+(x4-x3) / 2]≤first threshold; and |(y2-y1)-(y4-y3)| / [(y2-y1)+(y4-y3) / 2]≤second threshold.

7. The calibration method of the self-closed-loop pixelated headlamp detection device according to claim 1, characterized in that: The step 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 includes: S901: Enlarging the pattern with feature points by M / (M-2) times in the horizontal direction and by N / (N-2) times in the vertical direction, wherein the original pixels of the pattern with feature points are M×N; S902: Using the area indicated by the enlarged pattern with the characteristic points as the actual area of ​​the calibrated full-frame lighting of the self-closed-loop pixelated headlamp.

8. The calibration method of the self-closed-loop pixelated headlamp detection device according to claim 1, characterized in that: 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 comprises: S1001: Continuously light up the self-closed-loop pixelated headlamp, and test to obtain at least four groups of illuminances under junction temperatures, and obtain the polynomial as follows: S1002: Obtain polynomial coefficients a1, a2, a3 and a4 by calculating at least four groups of polynomials; Where E is the illumination in Lux, and Tj is the junction temperature in °C.

9. The calibration method of the self-closed-loop pixelated headlamp detection device according to claim 8, characterized in that: 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 also includes: The steady-state illuminance value is obtained based on the polynomial coefficients, the transient illuminance measured value and the transient junction temperature, and the calculation formula is: In the formula, E steady Expressed as steady-state illuminance value, unit is Lux, Tj real Expressed as transient junction temperature in °C, Tj steady It is the junction temperature in steady state, in °C, E real It is expressed as the measured value of instantaneous illuminance in Lux, and a1, a2, a3 and a4 are polynomial coefficients.

10. A calibration system for a self-closed-loop pixelated headlamp detection device, characterized in that: The calibration system is implemented by the calibration method of the self-closed-loop pixelated headlamp detection device according to any one of claims 1 to 9, the self-closed-loop pixelated headlamp detection device comprises an imaging colorimeter, a test device and optical detection software, and the calibration system comprises: 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 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; 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 a preset first condition; A headlamp installation position calibration module 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 characteristic points and use the imaging colorimeter to collect the pattern with characteristic points; determine whether the corner point coordinates of the pattern with characteristic points meet a preset second condition through optical detection software; and complete the calibration of the installation position of the self-closed-loop pixelated headlamp in response to the corner point coordinates of the pattern with characteristic points meeting the preset second condition; A headlamp light pattern area calibration module, adapted to calculate the central coordinate position of the feature point in the pattern with the feature point using a centroid algorithm; and to perform pixel compensation on the pattern with the feature point based on the central coordinate position of the feature point to complete the calibration of the self-closed-loop pixelized headlamp light pattern area; The headlamp illumination calibration module is suitable for measuring the steady-state illumination value of the self-closed-loop pixelated headlamp by using a polynomial fitting to measure the influence of junction temperature on illumination; and completing the calibration of the illumination of the self-closed-loop pixelated headlamp based on the steady-state illumination value.

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