A high-precision pixel-level LED brightness acquisition method for cameras with different parameter settings

Abstract

The present application relates to a kind of different parameter setting camera high-precision pixel-level LED brightness acquisition method, the method is under different aperture value conditions respectively with camera to the LED display unit to be measured for image acquisition, obtain the image when the high brightness area of light spot is not saturated, intermediate brightness area is clear, low brightness transition area is clear;For any light spot, according to the three area brightness data synthesis the real brightness integral value of the light spot.The present application can realize the accurate acquisition of the high brightness area of light spot corresponding to the same LED pixel, intermediate brightness area, the edge transition threshold zone of very low brightness, synthesis high-precision pixel-level LED light spot brightness acquisition value, so as to greatly improve the acquisition, correction precision, be beneficial to the promotion of LED display uniformity.

Description

Technical Field

[0001] This invention relates to a pixel-level LED brightness acquisition method. More particularly, it relates to a high-precision pixel-level LED brightness acquisition method using a camera with different parameter settings. Background Technology

[0002] The parameter settings of an optical camera affect the acquisition of optical parameters, mainly including aperture, focal length, and exposure time. Aperture primarily controls the amount of light entering the lens; a larger aperture allows more light in, resulting in a higher luminous flux to the target surface; a smaller aperture allows less light in, resulting in a lower luminous flux to the target surface. A longer exposure time allows for a greater cumulative amount of light to the target surface, theoretically enabling the capture of lower brightness levels, but also introducing more noise; a shorter exposure time results in a smaller cumulative amount of light, making it harder to detect lower brightness levels. In the case of LED pixel-level luminous intensity detection, focal length is secondary because the total light intensity distributed across the light spot is less important than the sharpness of the pixel-formed spot when extracting pixel-level luminous intensity. For LED pixel-level chip luminous spots, there is a central region with extremely high brightness, an intermediate region, and an edge transition threshold zone with extremely low brightness; accurately extracting pixel-level spot data from the target surface is crucial for high-precision acquisition. Specifically, aperture is the size of the opening through which light passes in the lens, where D is the aperture diameter, as shown in the attached diagram. Figure 1 As shown, at this time, the aperture luminous flux is: S = π(D / 2) 2 As attached Figure 2a , 2b As shown, for the light spot of a single LED pixel imaging, when the aperture is large, due to the large amount of light entering, the brightness of the edge transition threshold zone of the extremely low brightness of the light spot becomes higher, and the boundary outline becomes clearer. However, at this time, the bright central area exhibits saturation, which appears as a "cropped" state in the data. When the aperture is small, the amount of light entering is relatively small, and the data of the bright central area shows a smooth cone-shaped peak. The middle area is also relatively clear, but the light flux obtained by the edge transition zone of the extremely low brightness is relatively small, almost blending into the noise, and the boundary of the light spot cannot be distinguished. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for high-precision pixel-level LED brightness acquisition using a camera with different parameter settings.

[0004] To address the aforementioned technical problems, the present invention provides a high-precision pixel-level LED brightness acquisition method for cameras with different parameter settings as follows:

[0005] Under aperture values ​​of f0, f1, and f2, the camera acquires images of the LED display unit under test, obtaining images of the spot when the high-brightness region Q1 is unsaturated, the intermediate-brightness region Q3 is clear, and the low-brightness transition region Q4 is clear. For any spot, the true brightness integral value of the spot is synthesized based on the brightness data of the three regions.

[0006] The calibration methods for the high-brightness region Q1, the intermediate-brightness region Q3, and the low-brightness transition region Q4 are as follows:

[0007] Two images of the LED display unit were acquired using a camera under different aperture values, resulting in image P1 with saturated high-brightness areas and clear boundaries in low-brightness areas, and image P2 with unsaturated high-brightness areas. The complete light spot area Q0 and the high-brightness area Q1 were extracted from image P1. The medium-high brightness area Q2 was extracted from image P2. The high-brightness area Q1 was subtracted from the medium-high brightness area Q2 to obtain the intermediate brightness area Q3. The low-brightness transition area Q4 was obtained by subtracting the medium-high brightness area Q2 from the complete light spot area Q0.

[0008] In image P1, over 80% of the camera pixels in the mid-to-high brightness area have a brightness value equal to L, while the camera pixels in the low brightness area have a brightness value between 60%×L and 80%×L. L is the maximum brightness value of the camera pixels in the image taken under large aperture conditions. In image P2, the brightest camera pixel at the center of the light spot has a brightness value between 80%×L and 85%×L. L is the maximum brightness value of the camera pixels in the image taken under large aperture conditions.

[0009] In image P1, the brightness value of camera pixels in the complete light spot area Q0 is higher than 60%×L, and the brightness value of camera pixels in the high brightness area Q1 is L; in image P2, the brightness value of camera pixels in the medium-high brightness area Q2 is higher than 60%×L.

[0010] The aperture values ​​f0, f1, and f2 are calibrated as follows: The camera aperture value is adjusted to acquire images of the LED display unit. The aperture value corresponding to the unsaturated high-brightness area Q1 of the light spot is f0; the aperture value corresponding to the clear middle brightness area Q3 of the light spot is f1; and the aperture value corresponding to the clear low-brightness transition area Q4 of the light spot is f2.

[0011] When the high-brightness region Q1 of the light spot in the LED display unit image is unsaturated, the brightness values ​​of the camera pixels in this region are all within the range of 80%×L to 85%×L; when the intermediate brightness region Q3 of the light spot is clear, more than 80% of the camera pixels in the high-brightness region Q1 have a brightness value of L, and the brightness values ​​of the camera pixels in the intermediate brightness region Q3 are all within the range of 80%×L to 85%×L; when the low-brightness transition region Q4 is clear, the brightness values ​​of the camera pixels in this region are all within the range of 60%×L to 80%×L.

[0012] Furthermore, based on the calibration coefficient μ when the aperture value is f0 relative to the aperture value f1... 12 The calibration factor for an aperture value of f2 relative to an aperture value of f1 is μ. 32 After correcting the luminance integral values ​​of the high-brightness region Q1 and the low-brightness transition region Q4 respectively, the luminance integral values ​​of the three regions are combined to form the true luminance integral value of the spot.

[0013] The calibration coefficients are obtained as follows:

[0014] Images were acquired from the LED display unit at aperture values ​​of f0, f1, and f2. The luminance integral value of the central luminance region Q3 in the first image was recorded as L13; the luminance integral value of the central luminance region Q3 in the second image was recorded as L23; and the luminance integral value of the central luminance region Q3 in the third image was recorded as L33. The calibration coefficient μ for aperture value f0 relative to aperture value f1 was also recorded. 12 =L23 / L13, the calibration factor for f2 relative to f1 is μ. 32 =L23 / L33.

[0015] Suppose that in the image of the LED display unit under test acquired under aperture values ​​of f0, f1, and f2, the luminance integral value of the high-brightness region Q1 is L11', the luminance integral value of the intermediate-brightness region Q3 is L23', and the luminance integral value of the low-brightness transition region Q4 is L34'; the true luminance integral value of the light spot is L11' × μ 12 +L23'+L34'×μ 32 .

[0016] The effective effect of this invention is that by setting different parameters for the camera, it is possible to accurately acquire the high-brightness area, intermediate brightness area, and edge transition threshold zone of the light spot corresponding to the same LED pixel. Then, through calibration calculation and data synthesis, a high-precision pixel-level LED light spot brightness acquisition value is obtained. This can effectively solve the problem that under the existing fixed aperture parameter conditions, the acquisition of LED light spots will result in saturation of the high-brightness central area or unclear boundary of the edge transition threshold zone of the extremely low brightness. This greatly improves the acquisition and correction accuracy and is conducive to improving display uniformity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of aperture and luminous flux.

[0018] Figure 2a , Figure 2b These are the shapes of the LED pixel light spots captured when the aperture is set to a smaller and a larger value, respectively.

[0019] Figure 3This is a flowchart of the present invention.

[0020] Figure 4 This is a schematic diagram of the process for dividing the light spot area. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the drawings, not the entire structure.

[0022] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0025] Example 1

[0026] A camera array is used to acquire images of the LED display unit.

[0027] like Figure 3 As shown, the high-precision pixel-level LED brightness acquisition method for cameras with different parameter settings of the present invention is as follows: a. Calibration

[0028] 1. Light up the LED display unit; here, the LED display unit can be an LED display screen, an LED display cabinet, an LED display module, or a certain area of ​​an LED display screen; all LED pixels can be lit, or LED pixels spaced n rows and n columns apart can be lit, as long as the lighting method is such that the light spots formed by each LED pixel are separated in the camera's field of view; use a camera array to acquire images of the LED display unit, and adjust one of the camera parameters of the camera array so that the light spots formed by the LED pixels in the camera's field of view are as follows. Figure 2a As shown, the high-brightness area is saturated, meaning that over 80% of the camera pixels in the mid-to-high brightness area have a brightness value equal to L. The low-brightness area has a clear boundary, meaning that the camera pixel brightness value is between 60% × L and 80% × L, where L is the maximum brightness value of the camera pixels in the image taken under large aperture conditions. The image of the LED display unit at this time is captured by this camera and denoted as image P1. Another camera parameter is adjusted so that the light spot formed by the LED pixels in the field of view of this camera is as shown... Figure 2b As shown, the high-brightness area is just unsaturated, that is, the brightness value of the camera pixel at the center of the light spot is lower than L, generally between 80%×L and 85%×L. The image of the LED display unit at this time is captured by the camera and recorded as image P2.

[0029] 2. Under low aperture conditions, the brightness value at the center of the light spot is relatively accurate, but edge information is lost. Under high aperture conditions, although the edges are clear, the center of the light spot is oversaturated. Therefore, by combining images acquired under both high and low aperture conditions, a complete and accurate light spot brightness value can be obtained. Specifically, for example... Figure 4 As shown, image P1 is processed. Since image P1 was acquired under high aperture conditions, it has a complete light spot. Therefore, the camera pixels with brightness values ​​exceeding 60% × L are extracted to obtain the complete light spot region Q0 of the LED pixels in the camera's field of view. At this time, due to the large aperture, the bright part in the light spot is saturated. The area with a camera pixel brightness value of L in the complete light spot region Q0 is recorded as the high brightness region Q1. Image P2 is processed. Since image P2 was acquired under small aperture conditions, edge information is lost, that is, the low brightness region is almost equal to the noise. At this time, the effective region in the light spot is only the medium-high brightness region. The camera pixels with brightness values ​​exceeding 60% × L are extracted to obtain the medium-high brightness region Q2 of the image. Subtracting the high brightness region Q1 from the medium-high brightness region Q2 gives the intermediate brightness region Q3, Q3 = Q2 - Q1. Then, subtracting the medium-high brightness region Q2 from the complete light spot region Q0 gives the low brightness transition region Q4, Q4 = Q0 - Q2.

[0030] 2. Use a camera array to acquire images of the LED display unit: Adjust the aperture parameters of one camera so that the high-brightness area Q1 is unsaturated, that is, the brightness values ​​of the camera pixels in the high-brightness area Q1 are all within the range of 80%×L to 85%×L, and record the aperture value f0 at this time; Adjust the aperture parameters of the second camera so that the middle brightness area Q3 of the light spot is clear, that is, more than 80% of the camera pixels in the high-brightness area Q1 of the light spot have a brightness value of L, and the brightness values ​​of the camera pixels in the middle brightness area Q3 are all within the range of 80%×L to 85%×L, and record the aperture value f1 at this time; Adjust the third aperture parameter so that the boundary of the low-brightness edge transition threshold zone of the light spot is clear, that is, the brightness values ​​of the camera pixels in the low-brightness transition area Q4 of the light spot are all within the range of 60%×L to 80%×L, and record the aperture value f2 at this time.

[0031] 3. Since the purpose of this invention is to capture images of the LED display unit using three cameras with different aperture values, collect the brightness integral values ​​of different areas of the light spot, and then synthesize them, the data from the three cameras must be converted to the same standard for accurate synthesis. This is because only the intermediate brightness area Q3 is undistorted in the data from the three cameras. For the high brightness area Q1, the image captured by one of the cameras will definitely be oversaturated. For the low brightness transition area Q4, it may be mixed with noise. Therefore, the data at this time is unreliable or even incorrect. Therefore, this invention calculates a calibration coefficient based on the data of the intermediate brightness area Q3 collected by the three cameras, thereby correcting the data of the high brightness area Q1 and the low brightness transition area Q4.

[0032] The first camera is set to an aperture of f0, the second to f1, and the third to f2, and images are captured from the LED display unit respectively. The luminance integral value of the central luminance region Q3 in the image captured by the first camera is recorded as L13; the luminance integral value of the central luminance region Q3 in the image captured by the second camera is recorded as L23; and the luminance integral value of the central luminance region Q3 in the image captured by the third camera is recorded as L33.

[0033] Based on the luminance integral value of the central luminance region Q3 in the images captured by each camera, the camera calibration coefficients under different shooting conditions are calculated. Specifically, the calculation method is as follows: using the luminance integral value L23 of the central luminance region Q3 in the image captured by the second camera as a reference value, the calibration coefficient μ of the first camera relative to the second camera is calculated. 12 =L23 / L13, the calibration coefficient of the third camera relative to the second camera is μ. 32 =L23 / L33.

[0034] b. Collection

[0035] Three cameras are set with aperture values ​​of f0, f1, and f2, respectively, and images of the LED display unit under test are acquired by the three cameras. The luminance integral value of the high-brightness area Q1 acquired by the first camera is recorded as L11', the luminance integral value of the intermediate-brightness area Q3 acquired by the second camera is recorded as L23', and the luminance integral value of the low-brightness transition area Q4 acquired by the third camera is recorded as L34'.

[0036] c. Synthesis

[0037] Based on the calibration coefficients obtained in step a, the true luminance integral value of each region is calculated: the true luminance integral value of the high-brightness region Q1 is equal to L11' × μ 12 The true luminance integral value of the intermediate brightness region Q3 is equal to L23', and the true luminance integral value of the low brightness transition region Q4 is equal to L34' × μ. 32 The sum of these three values ​​gives the precise integral value of the true brightness of the light spot, denoted as L11'×μ. 12 +L23'+L34'×μ 32 .

[0038] Example 2

[0039] A camera is used to acquire images of the LED display unit.

[0040] like Figure 2a , Figure 2b As shown, the high-precision pixel-level LED brightness acquisition method of the camera with different parameter settings of the present invention is as follows:

[0041] a. Calibration

[0042] 1. Lighting up the LED display unit can illuminate all LED pixels or LED pixels spaced n rows and n columns apart; here, the LED display unit can be an LED display screen, an LED display cabinet, an LED display module, or a specific area of ​​an LED display screen. A camera is used to capture images of the LED display unit, and the camera parameters are adjusted so that the light spots formed by the LED pixels in the camera's field of view are as follows... Figure 2a As shown, the high-brightness area is saturated, meaning that over 80% of the camera pixels in the mid-to-high brightness area have a brightness value equal to L. The low-brightness area has a clear boundary, meaning that the camera pixel brightness value is between 60% × L and 80% × L. L is the maximum brightness value of the camera pixels in the image taken under large aperture conditions. The image of the LED display unit at this time is captured and denoted as image P1. The camera parameters are adjusted so that the light spots formed by the LED pixels in the camera's field of view are as shown. Figure 2b As shown, the high-brightness area is just unsaturated, that is, the brightness value of the brightest camera pixel in the center of the light spot does not exceed L, and is generally between 80%×L and 85%×L. The image of the LED display unit at this time is collected and recorded as image P2.

[0043] 2. Under low aperture conditions, the brightness value at the center of the light spot is relatively accurate, but edge information is lost. Under high aperture conditions, although the edges are clear, the center of the light spot is oversaturated. Therefore, by combining images acquired under both high and low aperture conditions, a complete and accurate light spot brightness value can be obtained. Specifically, for example... Figure 4 As shown, image P1 is processed. Since image P1 was acquired under high aperture conditions and has a complete light spot, camera pixels with brightness values ​​exceeding 60% × L are extracted to obtain the complete light spot region Q0 of the LED pixels in the camera's field of view. At this point, due to the large aperture, the bright parts of the light spot become saturated. The area with a brightness value of L within the complete light spot region Q0 is recorded as the high-brightness region Q1. Figure 4 As shown, image P2 is processed. Since image P2 was acquired under small aperture conditions, edge information is lost, meaning that the low brightness area is almost equal to the noise. At this time, the effective area in the light spot is only the medium-high brightness area. The camera pixels with brightness values ​​exceeding 60% × L in the image are extracted to obtain the medium-high brightness area Q2. The high brightness area Q1 is subtracted from the medium-high brightness area Q2 to obtain the intermediate brightness area Q3, Q3 = Q2 - Q1. Then, the medium-high brightness area Q2 is subtracted from the complete light spot area Q0 to obtain the low brightness transition area Q4, Q4 = Q0 - Q2.

[0044] 2. Use a camera to acquire images of the LED display unit: Adjust the camera's aperture parameters so that the high-brightness area Q1 is unsaturated, meaning that the brightness values ​​of the camera pixels within the high-brightness area Q1 are all within the range of 80%×L to 85%×L, and record the aperture value f0 at this time; Adjust the camera's aperture parameters so that the central brightness area Q3 of the light spot is clear, meaning that more than 80% of the camera pixels within the high-brightness area Q1 have a brightness value of L, and the brightness values ​​of the camera pixels within the central brightness area Q3 are all within the range of 80%×L to 85%×L, and record the aperture value f1 at this time; Adjust the camera's aperture parameters again so that the boundary of the low-brightness edge transition threshold zone of the light spot is clear, meaning that the brightness values ​​of the camera pixels within the low-brightness transition area Q4 of the light spot are all within the range of 60%×L to 80%×L, and record the aperture value f2 at this time.

[0045] 3. With aperture values ​​of f0, f1, and f2, use a camera to capture images of the LED display unit. Record the luminance integral value of the central brightness region Q3 in the image captured at aperture value f0 as L13; the luminance integral value of the central brightness region Q3 in the image captured at aperture value f1 as L23; and the luminance integral value of the central brightness region Q3 in the image captured at aperture value f2 as L33.

[0046] Based on the luminance integral values ​​L13, L23, and L33 of the central luminance region Q3 in the three images, the camera calibration coefficient under different aperture conditions is calculated. Specifically, the calculation method is as follows: using the luminance integral value L23 of the central luminance region Q3 in the image acquired at aperture f1 as a reference value, the calibration coefficient μ for aperture f0 relative to aperture f1 is calculated. 12 =L23 / L13, the calibration factor for aperture value f2 relative to aperture value f1 is μ. 32 =L23 / L33.

[0047] b. Collection

[0048] Images of the LED display unit under test were captured by a camera at three aperture values: f0, f1, and f2. The integral value of the brightness of the high-brightness region Q1 (captured at f0) is recorded as L11', the integral value of the brightness of the intermediate-brightness region Q3 (captured at f1) is recorded as L23', and the integral value of the brightness of the low-brightness transition region Q4 (captured at f2) is recorded as L34'; c. Composite

[0049] Based on the calibration coefficients obtained in step a, the true luminance integral value of each region is calculated: the true luminance integral value of the high-brightness region Q1 is equal to L11' × μ 12 The true luminance integral value of the intermediate brightness region Q3 is equal to L23', and the true luminance integral value of the low brightness transition region Q4 is equal to L34' × μ. 32 The sum of these three values ​​gives the precise integral value of the true brightness of the light spot, denoted as L11'×μ. 12 +L23'+L34'×μ 32 .

Claims

1. A method for high-precision pixel-level LED brightness acquisition of different parameter setting cameras, characterized in that The method is as follows: The camera is used to collect images of the LED display unit under the conditions of aperture values f0, f1 and f2, and the images of the high-brightness area Q1, the clear middle-brightness area Q3 and the clear low-brightness transition area Q4 are obtained; for any one light spot, the real brightness integral value of the light spot is synthesized according to the brightness data of the three areas; the calibration coefficient μ 12 of the aperture value f0 relative to the aperture value f1 and the calibration coefficient μ 32 of the aperture value f2 relative to the aperture value f1 are obtained The brightness integral values of the high-brightness area Q1 and the low-brightness transition area Q4 are corrected respectively, and the real brightness integral value of the light spot is synthesized according to the brightness integral values of the three areas; the calibration coefficient is obtained as follows: the LED display unit is collected under the conditions of aperture values f0, f1 and f2, the brightness integral value of the middle-brightness area Q3 in the first image is L13, the brightness integral value of the middle-brightness area Q3 in the second image is L23, and the brightness integral value of the middle-brightness area Q3 in the third image is L33; the calibration coefficient μ 12 of the aperture value f0 relative to the aperture value f1 is L23 / L13, and the calibration coefficient μ 32 of the aperture value f2 relative to the aperture value f1 is L23 / L33; the brightness integral value of the high-brightness area Q1 is L11', the brightness integral value of the middle-brightness area Q3 is L23', and the brightness integral value of the low-brightness transition area Q4 is L34' in the images of the LED display unit collected under the conditions of aperture values f0, f1 and f2; the real brightness integral value of the light spot is L11'×μ 12 +L23'+L34'×μ 32 .

2. The method of claim 1, wherein the different parameter setting camera high-precision pixel-level LED brightness acquisition method is characterized in that The high-brightness region Q1, the intermediate-brightness region Q3 and the low-brightness transition region Q4 are calibrated as follows: Two LED display unit images are collected by the camera under different aperture values, to obtain an image P1 with a high-brightness region of a light spot saturated and a low-brightness region clear, and an image P2 with a high-brightness region unsaturated; the complete light spot region Q0 and the high-brightness region Q1 in the image P1 are taken out; the medium-high-brightness region Q2 in the image P2 is taken out; the medium-high-brightness region Q2 is subtracted from the high-brightness region Q1 to obtain the intermediate-brightness region Q3; the complete light spot region Q0 is subtracted from the medium-high-brightness region Q2 to obtain the low-brightness transition region Q4.

3. The method of claim 2, wherein the different parameter setting camera high-precision pixel-level LED brightness acquisition method is characterized by In the image P1, the brightness value of more than 80% of the camera pixels in the medium-high-brightness region is equal to L, and the brightness value of the camera pixels in the low-brightness region is between 60%×L and 80%×L, L being the maximum brightness value of the camera pixels in the image shot under a large aperture; In the image P2, the brightness value of the brightest camera pixels in the center of the light spot is between 80%×L and 85%×L, L being the maximum brightness value of the camera pixels in the image shot under a large aperture.

4. The method of claim 2, wherein the different parameter setting camera high-precision pixel-level LED brightness acquisition method is characterized in that In the image P1, the brightness value of the camera pixels in the complete light spot region Q0 is higher than 60%×L, and the brightness value of the camera pixels in the high-brightness region Q1 is L; in the image P2, the brightness value of the camera pixels in the medium-high-brightness region Q2 is higher than 60%×L.

5. The method of claim 1, wherein the different parameter setting camera high-precision pixel-level LED brightness acquisition method is characterized by The aperture values f0, f1 and f2 are calibrated as follows: the camera aperture value is adjusted to collect images of the LED display unit, wherein the aperture value corresponding to the time when the high-brightness region Q1 of the light spot is unsaturated is f0; the aperture value corresponding to the time when the intermediate-brightness region Q3 of the light spot is clear is f1; and the aperture value corresponding to the time when the low-brightness transition region Q4 of the light spot is clear is f2.

6. The method of claim 5, wherein the different parameter setting camera high-precision pixel-level LED brightness acquisition method is characterized by When the high-brightness region Q1 of the light spot in the LED display unit image is unsaturated, the brightness value of the camera pixels in the region is between 80%×L and 85%×L; when the intermediate-brightness region Q3 of the light spot is clear, the brightness value of more than 80% of the camera pixels in the high-brightness region Q1 is L, and the brightness value of the camera pixels in the intermediate-brightness region Q3 is between 80%×L and 85%×L; when the low-brightness transition region Q4 is clear, the brightness value of the camera pixels in the region is between 60%×L and 80%×L.

Images