Brightness detection tool and method of use

Abstract

The present application relates to the technical field of brightness detection, in particular to a kind of brightness detection tool and use method, the brightness detection tool includes upper cover, lower cover, detection component is arranged between the upper cover and the lower cover, the detection component includes multiple optical glasses, and the transmittance of multiple optical glasses is not identical.The present application is based on optical glass detection light source brightness, avoids the technical problem of color change of color plate using for a period of time, can ensure the brightness consistency of the instrument needing brightness adjustment in each illumination area, can improve the accuracy of brightness adjustment, improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of brightness detection technology, and specifically to a brightness detection fixture and its usage method. Background Technology

[0002] For devices with light sources, such as those providing illumination for cameras or supplemental lighting, these devices all have light sources with varying intensity. Therefore, in some usage scenarios, the light source needs to be adjusted. Additionally, on some production lines, to improve production efficiency, multiple identical devices with light sources are used simultaneously. These devices need to maintain consistency to avoid quality errors caused by differences in device adjustments; therefore, light source adjustment is also necessary.

[0003] Existing technologies for adjusting light sources primarily rely on brightness detection, adjusting the light source based on whether the brightness value meets requirements. Conventional methods for brightness detection typically use color charts in conjunction with spectrophotometers and other equipment. The brightness value is derived by measuring parameters such as the intensity and wavelength distribution of light reflected or transmitted from the color chart and comparing them with standard data.

[0004] However, there are some problems with using color charts. After a period of use, the color charts will change color, which will lead to inaccurate brightness values ​​and affect the accuracy of light source adjustment.

[0005] Based on this, the present invention provides a brightness detection fixture based on optical glass and a method for using it. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems in the prior art, the present invention provides a brightness detection fixture and a method for using it.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] In a first aspect, the present invention provides a brightness detection fixture, including an upper cover and a lower cover, wherein a detection component is disposed between the upper cover and the lower cover, and the detection component includes multiple optical glasses with different light transmittance.

[0009] Furthermore, the multiple optical glass pieces at the center of the detection component are defined as the first region, the multiple optical glass pieces at the upper left corner of the detection component are defined as the second region, the multiple optical glass pieces at the lower left corner of the detection component are defined as the third region, the multiple optical glass pieces at the upper right corner of the detection component are defined as the fourth region, and the multiple optical glass pieces at the lower right corner of the detection component are defined as the fifth region. The light transmittance of the optical glass in the first, second, third, fourth, and fifth zones is different from each other.

[0010] Furthermore, all optical glass is arranged in an array, with 12 columns in the horizontal direction and 10 rows in the vertical direction. Each optical glass is represented by a number xy, where x takes the values ​​A, B, C...J to represent the row number, and y takes the values ​​1, 2,...12 to represent the column number. The first region contains four optical glasses, namely E6, E7, F6, and F7; The second region contains four optical glasses, namely A1, A2, B1, and B2; The third region contains four optical glasses, namely I1, I2, J1, and J2; The fourth region contains four optical glasses, namely A11, A12, B11, and B12; The fifth region contains four optical glasses, namely I11, I12, J11, and J12.

[0011] Furthermore, the light transmittance at positions E7, A2, B1, I1, J2, A11, B12, I12, and J11 is 100%; the light transmittance at positions E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 is the same but less than that at position E7, and the light transmittance at position F6 is less than that at position E6.

[0012] Furthermore, the light transmittance at positions E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 is in the range of 70%-73%, and the light transmittance at position F6 is in the range of 55%-60%.

[0013] Furthermore, the light transmittance at positions E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 is 72%, while the light transmittance at position F6 is 58%.

[0014] Furthermore, the lower cover is provided with a plurality of grooves, the optical glass is disposed in the grooves, and a through hole is provided below the grooves.

[0015] Furthermore, the upper cover is provided with multiple through holes, and the through holes on the upper cover correspond one-to-one with the grooves on the lower cover.

[0016] Furthermore, the upper surface of the lower cover is provided with horizontal and vertical numbers, the horizontal numbers corresponding to the number of columns of the groove, and the vertical numbers corresponding to the number of rows of the groove.

[0017] Furthermore, a clarity adjustment plate is provided between the upper cover and the lower cover.

[0018] Secondly, the present invention also provides a method of using a brightness detection fixture, wherein the method of using the above-mentioned brightness detection fixture includes: S1. Obtain images of all optical glass in the brightness adjustment fixture under light source illumination. Based on the images, obtain the grayscale value of the first specified optical glass. Determine whether the grayscale value of the first specified optical glass is within the specified range. If yes, continue to step S2; otherwise, adjust the brightness until the grayscale value of the first specified optical glass is within the specified range. S2. Obtain the grayscale values ​​of multiple second specified optical glasses in the brightness adjustment fixture. If one of the multiple second specified optical glasses has a grayscale value less than the judgment value, the brightness needs to be increased until there is no grayscale value less than the judgment value among the multiple second specified optical glasses and the grayscale value of the first specified optical glass is within the specified range. Then the light source brightness is qualified.

[0019] Furthermore, the first designated optical glass is the optical glass at position E7.

[0020] Furthermore, the specified range is 180-185.

[0021] Furthermore, the second designated optical glass is the optical glass at positions A1, B2, A12, B11, E6, F7, I2, J1, I11, and J12.

[0022] Furthermore, the judgment value is 148.

[0023] Furthermore, the method of use also includes: S3. Based on step S2, if after increasing the brightness, there is no condition in which the gray value of the second specified optical glass is less than the judgment value and the condition in which the gray value of the first specified optical glass is within the specified range, and only one of the two conditions can be met, then the interpolation method is used for automatic adjustment.

[0024] Furthermore, during the automatic adjustment process using interpolation, the number of loops is limited to 8.

[0025] Furthermore, before acquiring images of all optical glass in the brightness adjustment fixture under illumination by the light source, the brightness detection fixture is sharpened. The specific method is as follows: The system acquires images of all optical glass in the brightness adjustment fixture under illumination by a light source, converts the images to grayscale, and applies the Laplacian operator to extract image edge and detail information. When the variance of the acquired Laplacian result is within the set threshold range, the image is considered clear. If the image is not clear, the camera focal length is adjusted until the image clarity meets the requirements, and then the camera focal length parameter is fixed.

[0026] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a brightness adjustment fixture to detect the brightness of a light source based on optical glass with different transmittance, avoiding the technical problem of color plate discoloration after a period of use. Therefore, using optical glass with different transmittance for brightness detection can ensure the brightness consistency of the instrument requiring brightness adjustment in each illumination area, thereby improving the accuracy of brightness adjustment and increasing production efficiency.

[0027] The method of using the brightness detection fixture provided by the present invention first determines whether the light source intensity is appropriate based on an optical glass at the center position, and then determines whether the light source intensity at other positions is consistent and uniform, thereby ensuring that the light source intensity is both appropriate and uniform, and improving adjustment efficiency and accuracy. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is an exploded structural diagram of Embodiment 1 of the present invention; Figure 3 This is a position coding diagram of each optical glass in Embodiment 1 of the present invention.

[0029] Explanation of reference numerals in the attached figures: 1. Top cover, 2. Bottom cover, 3. Optical glass, 4. Clarity adjustment plate. Detailed Implementation

[0030] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0031] It should be noted that, unless otherwise specifically stated, the relative arrangement and numerical expressions of the components and steps described in these embodiments should not be construed as limiting the scope of the invention.

[0032] The following description of exemplary embodiments is merely illustrative and is not intended to limit the invention or its application or use in any way. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail herein, but where applicable, such techniques, methods, and apparatus should be considered part of this specification.

[0033] Example 1 This embodiment provides a brightness detection fixture, such as... Figure 1 and Figure 2As shown, the device includes an upper cover 1 and a lower cover 2, with multiple optical glass panes 3 disposed between the upper cover 1 and the lower cover 2. In this embodiment, the optical glass panes 3 used are optical glass panes 3 with different light transmittance. Specifically, the lower cover 2 is rectangular, with rounded corners at the four corners. The upper surface of the lower cover 2 has multiple grooves, each groove containing one optical glass pane 3. The grooves are arranged in 10 rows, with 12 holes in each row. However, in other embodiments, the number of grooves can be increased or decreased as needed.

[0034] The optical glass 3 is circular, and each optical glass 3 is the same size, but their light transmittance varies. Brightness adjustment is based on the grayscale values ​​of the optical glass 3 at the center and four corners. The center position refers to: (e.g., ...) Figure 3 The four optical glass 3 are located at the four intersections of columns 6 and 7 from left to right and rows 5 and 6 from top to bottom. The four corner positions refer to the top left, bottom left, top right, and bottom right corners. Four optical glass 3 are selected at each corner position. The top left corner is located at the intersection of rows 1 and 2 and columns 1 and 2. The bottom left corner is located at the intersection of rows 9 and 10 and columns 1 and 2. The top right corner is located at the intersection of rows 1 and 2 and columns 11 and 12. The bottom right corner is located at the intersection of rows 9 and 10 and columns 11 and 12.

[0035] According to such Figure 3 Each optical glass 3 is numbered as shown. For the four optical glasses 3 in the upper left corner, the transmittance of A1 and B2 is set to... The transmittance of A2 and B1 is ; For the four optical glass panes 3, I1, and J2 in the lower left corner, the light transmittance is... The transmittance of I2 and J1 is ; For the four optical glass panes 3, A11, and B12 in the upper right corner, the light transmittance is... The light transmittance of A12 and B11 is ; The light transmittance of the four optical glass panes 3, I11, and J12 in the lower right corner is... The light transmittance of I12 and J11 is ; The light transmittance of the four optical glasses 3, E6, and F7 at the center is... E7 has a light transmittance of The light transmittance of F6 is ; but, , , , , 100%, , , , , The light transmittance is the same and within the range of 70%-73%, preferably 72%. The light transmittance is less than And within the range of 55%-60%, 58% is preferred.

[0036] Except for the 20 optical glass pieces 3 in the center and four corners, the light transmittance of the optical glass pieces 3 in other positions is not required and can be set as needed.

[0037] The upper cover 1 has the same external dimensions as the lower cover 2, and is also rectangular, with rounded corners. The upper cover 1 has multiple through holes, each corresponding to a specific optical glass 3. The inner diameter of each through hole is smaller than that of the optical glass 3, allowing the brightness of the optical glass 3 to be observed through the through holes. A groove is also provided on the upper surface of the upper cover 1, giving it a convex shape on all sides. All the through holes are located within this groove.

[0038] The upper cover 1 and the lower cover 2 are fastened together by screws. In addition, a clarity adjustment plate 4 is provided between the upper cover 1 and the lower cover 2.

[0039] In addition, to facilitate obtaining information about the light transmission of the optical glass 3, a through hole with a small inner diameter is provided below the groove of the lower cover 2. A larger groove is provided on the lower surface of the lower cover 2, making the lower cover 2 a structure that bulges downwards on all sides. All the grooves for placing the optical glass 3 are located within this larger groove.

[0040] Example 2 This embodiment provides a method for using a brightness detection fixture. Using the brightness detection fixture provided in Embodiment 1, since the surface light source has a bright center and dark edges, it is necessary to adjust the brightness of the surface light source to ensure appropriate brightness in each area. The brightness adjustment is performed using the brightness detection fixture provided in Embodiment 1. Therefore, the method for using the aforementioned brightness detection fixture includes: S1. Obtain the gray value of the first specified optical glass 3 in the brightness adjustment fixture, and determine whether the gray value of the first specified optical glass 3 is within the specified range. If yes, continue to step S2; if no, adjust the brightness until the gray value of the first specified optical glass 3 is within the specified range. Among them, the first designated optical glass 3 is Figure 3The optical glass 3 at position E7 is specified to have a grayscale value of 180-185. If the grayscale value of the optical glass 3 at position E7 is greater than 185, it indicates that the brightness is too bright; if the grayscale value of the optical glass 3 at position E7 is less than 180, it indicates that the brightness is too dark. Both excessive brightness and excessive darkness will affect the interpretation results. Therefore, it is necessary to initially adjust the brightness of the light source based on the grayscale value of the optical glass 3 at position E7.

[0041] S2. Obtain the gray values ​​of multiple second designated optical glass 3 in the brightness adjustment fixture. If one of the multiple second designated optical glass 3 has a gray value that is less than the judgment value, the brightness needs to be increased until there is no gray value that is less than the judgment value among the multiple second designated optical glass 3 and the gray value of the first designated optical glass 3 is within the specified range. Then the light source brightness is qualified. Among them, the second designated optical glass 3 is the optical glass 3 at positions A1, B2, A12, B11, E6, F7, I2, J1, I11, and J12, with a determination value of 148.

[0042] S3. Based on step S2, if after increasing the brightness, none of the multiple second specified optical glasses 3 meet the conditions of having a grayscale value less than the judgment value or being within the specified range; if only one of these conditions is met, an interpolation method needs to be used for automatic adjustment, specifically: Based on the above two conditions, the brightness value of the light source is adjusted. Initially, if the grayscale value of the first designated optical glass 3 is within the specified range, and the grayscale value of any of the multiple second designated optical glasses 3 is less than the judgment value, the brightness value is increased. After increasing the brightness value, it is found that the brightness value has been adjusted too much, resulting in no grayscale value less than the judgment value among the multiple second designated optical glasses 3, but the grayscale value of the first designated optical glass 3 is higher than 185. Therefore, the brightness value is decreased. The brightness value after this adjustment is the average of the initial brightness value and the first brightness value. Then, the above two conditions are re-evaluated to determine whether they are satisfied.

[0043] If the conditions are not met, further adjustments are needed, such as lowering the brightness value. The adjusted brightness value will then be the average of the initial and second brightness values. This interpolation process is repeated until both conditions are met.

[0044] If the above two conditions are still not met after successive interpolation, the number of iterations is limited to end the adjustment process. The number of iterations can be set according to needs, for example, it can be set to 8 times. If the brightness qualification condition is still not met after 8 iterations, the uniformity of the light source itself is considered, or the judgment value is modified, until the brightness qualification condition is met.

[0045] The method for obtaining grayscale values ​​is as follows: a camera is set below the lower cover 2 and a surface light source is set above the upper cover 1. After the light emitted by the surface light source passes through the optical glass 3, the camera is used to obtain an image of the optical glass 3 illuminated by the surface light source. The grayscale value of each optical glass 3 can be obtained using the image.

[0046] Before acquiring grayscale values, sharpness adjustment is required to ensure that the acquired image sharpness meets usage requirements. The specific sharpness adjustment method is as follows: The brightness adjustment fixture is placed at the camera position of the imaging component, i.e., the imaging component is located below the lower cover 2, and the light source is set above the upper cover 1. The image is captured by selecting the position of the sharpness adjustment plate 4. The software uses image processing methods to convert the captured image into a grayscale image and applies the Laplacian operator to extract image edge and detail information. When the variance value of the acquired Laplacian result is within the defined threshold range, the image is considered sharp; the larger the variance value, the sharper the image. If the image is not sharp, the camera focus is adjusted until the sharpness meets the requirements, and then the camera knob is fixed. The sharpness adjustment plate 4 is set between the upper cover 1 and the lower cover 2, maintaining the same height position as the optical glass 3.

[0047] This invention, through a brightness adjustment fixture, can ensure the brightness consistency of instruments requiring brightness adjustment in each illumination area, thereby improving the accuracy of brightness adjustment and increasing production efficiency.

[0048] The above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A brightness detection fixture, characterized in that, It includes an upper cover and a lower cover, and a detection component is disposed between the upper cover and the lower cover. The detection component includes multiple optical glasses with different light transmittance. The multiple optical glass pieces at the center of the detection component are defined as the first region, the multiple optical glass pieces at the upper left corner of the detection component are defined as the second region, the multiple optical glass pieces at the lower left corner of the detection component are defined as the third region, the multiple optical glass pieces at the upper right corner of the detection component are defined as the fourth region, and the multiple optical glass pieces at the lower right corner of the detection component are defined as the fifth region. All optical glass is arranged in an array, with 12 columns in the horizontal direction and 10 rows in the vertical direction. Each optical glass is represented by a number xy, where x takes the values ​​A, B, C...J to represent the row number, and y takes the values ​​1, 2,...12 to represent the column number. The first region contains four optical glasses, namely E6, E7, F6, and F7; The second region contains four optical glasses, namely A1, A2, B1, and B2; The third region contains four optical glasses, namely I1, I2, J1, and J2; The fourth region contains four optical glasses, namely A11, A12, B11, and B12; The fifth region contains four optical glasses, namely I11, I12, J11, and J12; The light transmittance at positions E7, A2, B1, I1, J2, A11, B12, I12, and J11 is 100%; the light transmittance at positions E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 is the same but less than that at position E7; the light transmittance at position F6 is less than that at position E6. The light transmittance at positions E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 is in the range of 70%-73%, and the light transmittance at position F6 is in the range of 55%-60%. The usage methods of the brightness detection fixture include: S1. Obtain images of all optical glass in the brightness adjustment fixture under light source illumination. Based on the images, obtain the grayscale value of the first specified optical glass. Determine whether the grayscale value of the first specified optical glass is within the specified range. If yes, continue to step S2; otherwise, adjust the brightness until the grayscale value of the first specified optical glass is within the specified range. S2. Obtain the gray values ​​of multiple second specified optical glasses in the brightness adjustment fixture. If one of the multiple second specified optical glasses has a gray value that is less than the judgment value, the brightness needs to be increased until there is no gray value that is less than the judgment value among the multiple second specified optical glasses and the gray value of the first specified optical glass is within the specified range. Then the light source brightness is qualified. The first designated optical glass is the optical glass at position E7; The second specified optical glass is the optical glass at positions A1, B2, A12, B11, E6, F7, I2, J1, I11, and J12.

2. The brightness detection fixture according to claim 1, characterized in that, The light transmittance at positions E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 is 72%, while the light transmittance at position F6 is 58%.

3. The brightness detection fixture according to claim 2, characterized in that, The lower cover is provided with multiple grooves, the optical glass is disposed in the grooves, and there is a through hole below the grooves; The upper cover is provided with multiple through holes, and the through holes on the upper cover correspond one-to-one with the grooves on the lower cover.

4. The brightness detection fixture according to claim 3, characterized in that, The upper surface of the lower cover is provided with horizontal and vertical numbers, the horizontal numbers corresponding to the number of columns of the groove, and the vertical numbers corresponding to the number of rows of the groove; A clarity adjustment plate is also provided between the upper cover and the lower cover.

5. The brightness detection fixture according to claim 1, characterized in that, The specified range is 180-185.

6. The brightness detection fixture according to claim 1, characterized in that, The judgment value is 148.

7. The brightness detection fixture according to claim 1, characterized in that, The method of use also includes: S3. Based on step S2, if after increasing the brightness, there is no condition in which the gray value of the second specified optical glass is less than the judgment value and the condition in which the gray value of the first specified optical glass is within the specified range, and only one of the two conditions can be met, then the interpolation method is used for automatic adjustment. During the automatic adjustment process using interpolation, the number of loops is limited to 8.

Images