Brightness detection tool and use method

Abstract

The invention relates to the technical field of brightness detection, in particular to a brightness detection tool and a using method, the brightness detection tool comprises an upper cover and a lower cover, a detection assembly is arranged between the upper cover and the lower cover, the detection assembly comprises a plurality of pieces of optical glass, and the light transmittance of the plurality of pieces of optical glass is different. The light source brightness is detected based on the optical glass, the technical problem that the color plate changes color when used for a period of time is avoided, the brightness consistency of an instrument needing brightness adjustment in each illumination area can be guaranteed, the brightness adjustment accuracy can be improved, and the production efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brightness detection, in particular to a brightness detection tool and a use method thereof. BACKGROUND

[0002] For some devices with light sources, such as devices providing light for camera image acquisition or light supplement devices, these devices all have light sources, and the light intensity of the light sources has strong and weak divisions. Therefore, for some use scenarios, the light source needs to be adjusted. In addition, for some production lines, in order to improve production efficiency, multiple devices with light sources of the same model are used for production at the same time, and consistency needs to be maintained between these devices to avoid quality errors caused by different device adjustments. Therefore, the light source needs to be adjusted.

[0003] In the prior art, the light source is adjusted mainly based on brightness detection, and the light source is adjusted according to whether the brightness value meets the requirements. The conventional brightness detection method usually uses a color plate combined with a spectrophotometer and the like to complete, and the intensity, wavelength distribution and the like of the reflected or transmitted light of the color plate are measured, and the brightness value is obtained by comparing with the standard data.

[0004] However, there are some problems in using the color plate, that is, the color plate will discolor after being used for a period of time, thereby causing the detected brightness value to be inaccurate and affecting the light source adjustment accuracy.

[0005] Therefore, the present application provides a brightness detection tool based on optical glass and a use method thereof. SUMMARY

[0006] In order to solve the above technical problems in the prior art, the present application provides a brightness detection tool and a use method thereof.

[0007] To achieve the above purpose, the technical scheme of the present application is as follows: In a first aspect, the present application provides a brightness detection tool, comprising an upper cover and a lower cover, a detection assembly is arranged between the upper cover and the lower cover, the detection assembly comprises a plurality of optical glasses, and the transmittances of the plurality of optical glasses are different.

[0008] Further, the plurality of optical glasses at the center position of the detection assembly are set as a first region, the plurality of optical glasses at the upper left corner position of the detection assembly are set as a second region, the plurality of optical glasses at the lower left corner position of the detection assembly are set as a third region, the plurality of optical glasses at the upper right corner position of the detection assembly are set as a fourth region, and the plurality of optical glasses at the lower right corner position of the detection assembly are set as a fifth region. The transmittances of the optical glasses in the first region, the second region, the third region, the fourth region and the fifth region are different from each other.

[0009] Further, all optical glasses are arranged in an array, arranged in 12 columns in the lateral direction and 10 rows in the vertical direction, and the optical glass in each position is indicated by the number xy, wherein x takes A, B, C, …, J, indicating the row number, and y takes 1, 2, …, 12, indicating the column number. The first area contains four optical glasses, E6, E7, F6, and F7 respectively. The second area contains four optical glasses, A1, A2, B1, and B2 respectively. The third area contains four optical glasses, I1, I2, J1, and J2 respectively. The fourth area contains four optical glasses, A11, A12, B11, and B12 respectively. The fifth area contains four optical glasses, I11, I12, J11, and J12 respectively.

[0010] Further, the transmittance of E7, A2, B1, I1, J2, A11, B12, I12, and J11 positions are all 100%; the transmittance of E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 positions are the same and less than that of E7 position, and the transmittance of F6 position is less than that of E6 position.

[0011] Further, the transmittance of E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 positions are within the range of 70%-73%, and the transmittance of F6 position is within the range of 55%-60%.

[0012] Further, the transmittance of E6, F7, A1, B2, I2, J1, A12, B11, I11, and J12 positions are 72%, and the transmittance of F6 position is 58%.

[0013] Further, a plurality of grooves are arranged on the lower cover, the optical glasses are arranged in the grooves, and the grooves have through holes below.

[0014] Further, a plurality of through holes are arranged on the upper cover, and the through holes on the upper cover correspond one-to-one to the grooves on the lower cover.

[0015] Further, the upper surface of the lower cover is provided with lateral numbers and vertical numbers, the lateral numbers correspond to the number of columns of the grooves, and the vertical numbers correspond to the number of rows of the grooves.

[0016] Further, a definition adjustment plate is arranged between the upper cover and the lower cover.

[0017] In a second aspect, the present application also provides a method for using the brightness detection tool, the method comprising: S1, obtaining images of all optical glasses in the brightness adjustment tool under the irradiation of the light source, obtaining a gray value of a first specified optical glass based on the images, determining whether the gray value of the first specified optical glass is within a specified range, if yes, continuing to step S2; if no, adjusting the brightness until the gray value of the first specified optical glass is within the specified range; S2, obtaining gray values of a plurality of second specified optical glasses in the brightness adjustment tool, if there is one gray value less than a determination value among the plurality of second specified optical glasses, the brightness needs to be increased until there is no gray value less than the determination value among the plurality of second specified optical glasses and the gray value of the first specified optical glass is within the specified range, then the brightness of the light source is qualified.

[0018] Further, the first specified optical glass is an optical glass at position E7.

[0019] Further, the specified range is 180-185.

[0020] Further, the second specified optical glass is an optical glass at position A1, B2, A12, B11, E6, F7, I2, J1, I11, J12.

[0021] Further, the determination value is 148.

[0022] Further, the method further comprises: S3, based on step S2, if after increasing the brightness, the condition that there is no gray value less than the determination value among the plurality of second specified optical glasses and the condition that the gray value of the first specified optical glass is within the specified range can only satisfy one of them, an interpolation method is used for automatic adjustment.

[0023] Further, in the process of automatic adjustment by the interpolation method, the number of cycles is limited to 8 times.

[0024] Further, before obtaining the images of all optical glasses in the brightness adjustment tool under the irradiation of the light source, the brightness detection tool is adjusted for definition, and the specific method is: obtaining images of all optical glasses in the brightness adjustment tool under the irradiation of the light source, converting the images into gray scale images, and applying a Laplace operator to extract image edges and detail information; when the variance value of the obtained Laplace result is within a set threshold range, the image is considered to be clear; if the image is not clear, the camera focal length is adjusted until the image definition meets the requirements, and then the camera focal length parameter is fixed.

[0025] Compared with the prior art, the present application has the following beneficial effects: The application adjusts the brightness of the light source based on the optical glass with different transmittance, avoids the technical problem of color plate discoloration after a period of use, and thus, the brightness detection is performed by using the optical glass with different transmittance, the brightness consistency of the instrument requiring brightness adjustment in each illumination area can be ensured, the accuracy of brightness adjustment is improved, and the production efficiency is improved.

[0026] The use method of the brightness detection tool provided by the application first judges whether the light source intensity is appropriate based on the optical glass at the center position, then judges whether the light source intensity at other positions is consistent and uniform, and thus, the light source intensity is ensured to be appropriate and uniform, and the adjustment efficiency and accuracy are improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the embodiment one of the application. Figure 2 It is an exploded structural schematic diagram of the embodiment one of the application. Figure 3 It is a position coding diagram of each optical glass in the embodiment one of the application.

[0028] BRIEF DESCRIPTION OF DRAWINGS 1, upper cover, 2, lower cover, 3, optical glass, 4, definition adjustment plate. DETAILED DESCRIPTION

[0029] The technical solutions of the application will be clearly described below with reference to the drawings, obviously, the described embodiments are not all the embodiments of the application, and all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0030] It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions set forth in these embodiments should not be understood as limiting the scope of the application.

[0031] The following description of exemplary embodiments is merely illustrative in nature and is in no way intended to limit the application or its application or use. Techniques, methods, and devices known to those skilled in the relevant art may not be discussed in detail here, but in the case of applicable techniques, methods, and devices, these techniques, methods, and devices should be considered as part of this specification.

[0032] Embodiment one The embodiment provides a brightness detection tool, which comprises an upper cover, a lower cover, a plurality of optical glasses, a definition adjustment plate, and a light source. Figure 1 and Figure 2As shown, including the upper cover and the lower cover, the upper cover and the lower cover are provided with a plurality of optical glass, the optical glass used in the embodiment is optical glass with different transmittance. Specifically, the lower cover is rectangular, and the four corners of the rectangle have a transition arc. The upper surface of the lower cover is provided with a plurality of grooves, and each groove is provided with an optical glass. The grooves are arranged in 10 rows, and each row is provided with 12 holes. However, in other embodiments, the number of grooves can be increased or decreased according to requirements.

[0033] The optical glass is circular, and the size of each optical glass is the same, but the transmittance is different. When adjusting the brightness, the gray value of the optical glass at the center position and the corner position is taken as the reference for adjustment. The center position refers to: Figure 3 As shown from left to right, the four optical glasses at the intersection of the sixth column and the seventh column and the fifth row and the sixth row from top to bottom; the corner position refers to: the upper left corner, the lower left corner, the upper right corner, and the lower right corner. Four optical glasses are selected at each corner position. The upper left corner is: the optical glass at the intersection of the first row, the second row, the first column and the second column; the lower left corner is: the optical glass at the intersection of the ninth row, the tenth row, the first column and the second column; the upper right corner is: the optical glass at the intersection of the first row, the second row, the eleventh column and the twelfth column; and the lower right corner is: the optical glass at the intersection of the ninth row, the tenth row, the eleventh column and the twelfth column.

[0034] According to the numbering of each optical glass as shown in Figure 3 , for the four optical glasses at the upper left corner, the transmittance of A1 and B2 is set to , the transmittance of A2 and B1 is ; For the four optical glasses at the lower left corner, the transmittance of I1 and J2 is , the transmittance of I2 and J1 is ; For the four optical glasses at the upper right corner, the transmittance of A11 and B12 is , the transmittance of A12 and B11 is ; For the four optical glasses at the lower right corner, the transmittance of I11 and J12 is , the transmittance of I12 and J11 is ; For the four optical glasses at the center position, the transmittance of E6 and F7 is , the transmittance of E7 is , and the transmittance of F6 is ; Then, , , , , is 100%. 、 、 、 、 The transmittance is the same and in the range of 70%-73%, preferably 72%, The transmittance is less than and in the range of 55%-60%, preferably 58%.

[0035] The transmittance of the optical glass in the remaining positions is not required, and is set as needed, except for the 20 optical glasses in the center position and the four corner positions.

[0036] The upper cover has the same size and shape as the lower cover, and is also rectangular, with a transition arc at the four corners of the rectangle. The upper cover has a plurality of through holes, and the positions of the through holes correspond one-to-one to the optical glasses. The inner diameter of the through holes is smaller than that of the optical glasses, so that the brightness of the optical glasses can be obtained through the through holes. The upper surface of the upper cover is also provided with a groove, so that the upper cover has a structure protruding upward around the four sides, and all the through holes are arranged in the groove.

[0037] The upper cover and the lower cover are connected by screws, and the upper cover and the lower cover are also provided with a clarity adjustment plate.

[0038] In addition, in order to facilitate the acquisition of the light transmission condition of the optical glass, a through hole with a smaller inner diameter is arranged below the groove of the lower cover. A groove with a larger size is arranged on the lower surface of the lower cover, so that the lower cover has a structure protruding downward around the four sides, and all the grooves for placing the optical glasses are located in this groove with a larger size.

[0039] Embodiment Two The embodiment provides a use method of the brightness detection tool. The brightness detection tool provided in Embodiment One is used. Since the surface light source has a condition of center bright and dark around the four sides, in order to adapt to appropriate brightness in each area, the brightness of the surface light source needs to be adjusted. The brightness detection tool provided in Embodiment One is used for brightness adjustment. The use method of the brightness detection tool includes the following steps. S1, obtaining the gray value of the first specified optical glass in the brightness adjustment tool, judging whether the gray value of the first specified optical glass is in the specified range, if yes, continuing to step S2; if no, adjusting the brightness until the gray value of the first specified optical glass is in the specified range. Among them, the first specified optical glass is the optical glass in the E7 position of Figure 3 If the gray value of the optical glass in the E7 position is greater than 185, it indicates that the brightness is too bright; if the gray value of the optical glass in the E7 position is less than 180, it indicates that the brightness is too dark. Therefore, the brightness of the light source needs to be adjusted according to the gray value of the optical glass in the E7 position.

[0040] S2, obtaining the gray values of the plurality of second specified optical glasses in the brightness adjustment tool, if there is one gray value less than the determination value in the plurality of second specified optical glasses, the brightness needs to be raised until there is no gray value less than the determination value in the plurality of second specified optical glasses and the gray value of the first specified optical glass is in the specified range, then the light source brightness is qualified; Wherein, the second specified optical glasses are the optical glasses at positions A1, B2, A12, B11, E6, F7, I2, J1, I11 and J12, and the determination value is 148.

[0041] S3, on the basis of step S2, if after raising the brightness, there is no condition that the gray value is less than the determination value and the condition that the gray value is in the specified range in the plurality of second specified optical glasses, and only one of the two conditions is met, the interpolation method needs to be used for automatic adjustment, specifically: With the above two conditions as the target, the brightness value of the light source is adjusted. Under the initial condition, if the gray value of the first specified optical glass is in the specified range, and there is a gray value less than the determination value in the plurality of second specified optical glasses, the brightness value is increased. After the brightness value is increased, it is found that the brightness value is adjusted too much, resulting in that there is no gray value less than the determination value in the plurality of second specified optical glasses, but the gray value of the first specified optical glass is higher than 185, then the brightness value is reduced. The brightness value after this adjustment is the average of the initial brightness value and the first brightness value, and then it is re-judged whether the above two conditions are met.

[0042] If not, it also needs to be adjusted, for example, the brightness value is reduced, then the brightness value after this adjustment is the average of the initial brightness value and the second brightness value. The interpolation is performed in turn until the above two conditions are met.

[0043] If the above two conditions are still not met after the interpolation in turn, the number of cycles is limited to end the adjustment process. The number of cycles can be set according to the demand, for example, it can be set to 8 times. If the brightness qualified condition is still not met after 8 cycles, whether the uniformity of the light source itself is qualified is considered, or the determination value is modified until the brightness qualified condition is met.

[0044] Wherein, the method for obtaining the gray value is to set a camera below the lower cover and a surface light source above the upper cover. The light emitted by the surface light source passes through the optical glass, and then the image of the optical glass irradiated by the surface light source is obtained by using the camera. The gray value of each optical glass can be obtained by using the image.

[0045] Before obtaining the gray value, the definition needs to be adjusted so that the definition of the obtained image meets the use requirement. The specific definition adjustment method is: The brightness adjustment tool is placed in the shooting position of the shooting assembly, that is, the shooting assembly is located below the lower cover, the light source is arranged above the upper cover, the position of the definition adjustment plate is selected to obtain an image, the software adopts an image processing method, converts the shot image into a gray image, and applies a Laplace operator to extract image edges and detail information. When the variance value of the obtained Laplace result is within the defined threshold range, the image is considered clear, and the larger the variance value, the clearer the image. If the image is not clear, adjust the camera focus until the definition meets the requirements, and then fix the camera knob. The definition adjustment plate is arranged between the upper cover and the lower cover, and is kept at the same height position as the optical glass.

[0046] The brightness adjustment tool can ensure the brightness consistency of the instrument requiring brightness adjustment in each illumination area, improve the accuracy of brightness adjustment, and improve the production efficiency.

[0047] The above specific embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

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.

2. The brightness detection fixture according to claim 1, characterized in that, 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.

3. The brightness detection fixture according to claim 2, characterized in that, 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%, while the light transmittance at position F6 is in the range of 55%-60%.

4. The brightness detection fixture according to claim 3, 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%.

5. The brightness detection fixture according to claim 4, 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.

6. The brightness detection fixture according to claim 4, 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.

7. A method of using a brightness detection fixture, comprising using the brightness detection fixture according to any one of claims 3-6, characterized in that, The method of use 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.

8. The method of use according to claim 7, characterized in that, The first specified optical glass is the optical glass at position E7; the specified range is 180-185.

9. The method of use according to claim 7, characterized in that, The second specified optical glass is the optical glass at positions A1, B2, A12, B11, E6, F7, I2, J1, I11, and J12; the judgment value is 148.

10. The method of use according to claim 7, 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.

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