Benchmark calibration device and benchmark calibration method for colorimetric instrument

Abstract

The invention discloses a benchmarking calibration device and a benchmarking calibration method of a colorimetric instrument, which are used for reducing calibration cost and improving accuracy of calibration measurement. The calibration device comprises a calibration main body, a fixed sliding block and a diaphragm, a placing space for placing the display module is arranged in the calibration main body, a guide groove is formed in the calibration main body, a measuring hole is formed in the guide groove, and the guide groove is communicated with the placing space through the measuring hole; the fixed sliding block is arranged in the guide groove, a first through hole and a second through hole are formed in the fixed sliding block, the fixed sliding block is controlled to move along the guide groove, so that the first through hole is aligned with the measuring hole or the second through hole is aligned with the measuring hole, and the fixed sliding block is used for connecting the standard colorimetric instrument and the colorimetric instrument to be measured. A probe of the standard colorimeter is aligned with the first through hole, and a probe of the to-be-measured colorimeter is aligned with the second through hole; the diaphragm is arranged in the measuring hole or arranged in the first through hole and the second through hole respectively, and the diaphragm is controlled to adjust the aperture size of the diaphragm.

Description

Technical Field

[0001] The present application relates to the technical field of instrument calibration, and in particular to a calibration device and a calibration method for a colorimetric instrument. Background Art

[0002] Colorimetric instruments are instruments specifically used to measure various parameters of the color of objects, including colorimeters, colorimeters, colorimeter, etc. In order to ensure that newly manufactured colorimetric instruments have a high degree of accuracy and reliability, a rigorous calibration process for these colorimetric instruments is indispensable.

[0003] The existing calibration method usually uses a standard colorimeter to measure a first set of data, moves the colorimeter to be measured to the position of the standard colorimeter and measures a second set of data using the same light source, and calibrates and adjusts the colorimeter to be measured based on the error between the first and second sets of data.

[0004] During the calibration process, it is often necessary to measure colorimetric measurement areas of different sizes separately. At this time, for measurement areas of different sizes, standard instruments of different specifications need to be frequently replaced to achieve measurement and calibration of different measurement areas. This not only increases the complexity and time cost of the operation, but also increases the procurement cost of standard instruments. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a calibration device and a calibration method for a colorimetric instrument, which can reduce the calibration cost and improve the accuracy of calibration measurement.

[0006] The first aspect of the present application provides a calibration device for a colorimetric instrument, comprising:

[0007] Calibration body, fixed slider and aperture;

[0008] A placement space for placing a display module is provided in the calibration body, a guide groove is provided on the calibration body, a measuring hole is provided in the guide groove, and the guide groove is connected to the placement space through the measuring hole;

[0009] The fixed slider is arranged in the guide groove, and a first through hole and a second through hole are arranged on the fixed slider. The fixed slider is controlled to move along the guide groove so that the first through hole is aligned with the measuring hole, or the second through hole is aligned with the measuring hole. The fixed slider is used to connect the standard colorimeter and the colorimeter to be measured. When connected, the probe of the standard colorimeter is aligned with the first through hole, and the probe of the colorimeter to be measured is aligned with the second through hole.

[0010] The diaphragm is arranged in the measuring hole, or is respectively arranged in the first through hole and the second through hole, and the diaphragm is controlled to adjust the aperture size of its own diaphragm.

[0011] Optionally, the aperture is fixed in the measuring hole via a threaded structure.

[0012] Optionally, a shading cloth is provided between the fixed slider and the calibration body, and the shading cloth is used to cover a gap between the fixed slider and the guide groove.

[0013] Optionally, a driving assembly is provided between the fixed slider and the guide groove, and the driving assembly includes a cylinder and a connecting rod, the cylinder is fixed on the calibration body, one end of the connecting rod is connected to the telescopic end of the cylinder, and the other end is connected to the fixed slider, and the cylinder and the connecting rod cooperate to control the movement of the fixed slider.

[0014] Optionally, a track is provided in the guide groove, and a pulley is provided on a side of the fixed sliding block facing the guide groove, and the pulley abuts against the track.

[0015] Optionally, a fixing ring is provided in the first through hole, the fixing ring is located between the aperture and the probe of the standard colorimeter, and the fixing ring is used to fix the probe of the standard colorimeter in the first through hole.

[0016] Optionally, a plurality of guide grooves are provided on the calibration body, each guide groove is provided with a measuring hole penetrating from top to bottom, and the apertures of the measuring holes on each guide groove are different from each other.

[0017] A second aspect of the present application provides a calibration method for a colorimetric instrument, which is applied to the first aspect and the calibration device of any optional manner in the first aspect, and the calibration method comprises:

[0018] S1. Determine the test aperture according to the size of the light spot to be tested, adjust the aperture of the diaphragm to be the same as the test aperture, and set the diaphragm in the measuring hole or in the first through hole and the second through hole;

[0019] S2, controlling the fixed slider to be in a standard position, in which the first through hole on the fixed slider is aligned with the measuring hole, and the probe of the standard colorimeter is connected to the first through hole;

[0020] S3, controlling the display module to display a test screen, and controlling the standard colorimeter to obtain a first standard value of a target light spot on the test screen, wherein the target light spot is a light spot in an area on the test screen directly facing the aperture;

[0021] S4, controlling the fixed slider to be in a measuring position, in which the second through hole on the fixed slider is aligned with the measuring hole, the probe of the colorimeter to be measured is connected to the second through hole, and controlling the colorimeter to be measured to obtain a first measurement value of the target light spot;

[0022] S5, calibrating the colorimetric instrument to be measured according to the standard data value and the first measurement value;

[0023] S6, keeping the test screen unchanged, executing steps S2, S3, and S4 again, obtaining a second standard value corresponding to the standard colorimeter and a second measurement value corresponding to the calibrated colorimeter to be tested;

[0024] S7. Determine whether the difference between the second standard value and the second measured value exceeds a preset difference. If not, complete the calibration. The preset difference is an error value corresponding to the specification of the standard colorimeter.

[0025] Optionally, after completing the calibration, the benchmark calibration method further includes:

[0026] S8. Setting a number of inspection screens according to preset rules;

[0027] S9, controlling the display module to display each inspection screen respectively, repeating steps S2, S3, and S4 for each inspection screen, and obtaining a third standard value and a third measurement value corresponding to each inspection screen, wherein the third measurement value is measured by a calibrated colorimeter to be measured, and the third standard value is measured by the standard colorimeter;

[0028] S10, calculating a target difference value corresponding to each inspection screen, wherein the target difference value is obtained by subtracting the third standard value corresponding to each inspection screen from the third measurement value;

[0029] S11. If the target differences corresponding to all the inspection images do not exceed the preset difference, it is determined that the calibrated colorimetric instrument to be tested meets the standard.

[0030] Optionally, the setting of a plurality of inspection screens according to preset rules includes:

[0031] Determine a brightness range according to the specifications of the standard colorimeter, and evenly divide the brightness range into a plurality of brightness intervals;

[0032] Taking at least 5 groups of brightness value data in each brightness interval to obtain a brightness value data set;

[0033] A plurality of inspection pictures are generated according to the brightness value data set, one inspection picture is generated corresponding to one set of brightness value data, and the plurality of inspection pictures are input into the display module.

[0034] Optionally, generating a plurality of inspection pictures according to the brightness value data set includes:

[0035] Determining a test color, wherein the test color is different from a color of the test picture;

[0036] A plurality of target inspection pictures are generated according to the inspection color and the brightness value data set, and the colors of the plurality of target inspection pictures are all inspection colors.

[0037] It can be seen from the above technical solutions that this application has the following effects:

[0038] The present application sets an aperture in the measuring hole or in the first through hole and the second through hole, and the aperture is controlled to adjust the size of its own aperture, so that the size of the light spot measured by the standard colorimeter and the colorimeter to be measured through the aperture can be controlled. The colorimeter to be measured and the standard colorimeter can measure data under the same size of light spot by adjusting the aperture. When it is necessary to measure measurement areas of different sizes, a single standard colorimeter is used in combination with the aperture to adjust the size of the light spot entering the standard colorimeter, and there is no need to equip standard instruments of various specifications, thereby reducing the purchase cost of the standard instrument and reducing the complexity of operation; by adjusting the size of the aperture, the size of the light spot measured by the standard colorimeter is made the same as the size of the light spot measured by the colorimeter to be measured, thereby improving the accuracy of calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of a calibration device for a colorimetric instrument provided in the present application;

[0041] Figure 2 A schematic diagram of an aperture in a calibration device for a colorimetric instrument provided in the present application;

[0042] Figure 3 A schematic diagram of a driving component in a calibration device for a colorimetric instrument provided in the present application;

[0043] Figure 4 A schematic diagram of the cooperation between a track and a pulley in a calibration device for a colorimetric instrument provided in the present application;

[0044] Figure 5 A schematic diagram of a fixing ring in a calibration device for a colorimetric instrument provided in the present application;

[0045] Figure 6 Another schematic diagram of a fixing ring in a calibration device for a colorimetric instrument provided by the present application;

[0046] Figure 7 A schematic diagram of a shading cloth in a calibration device for a colorimetric instrument provided in the present application;

[0047] Figure 8 A schematic flow chart of a method for calibrating a colorimetric instrument provided in the present application;

[0048] Fig. 9 Another schematic diagram of a flow chart of a calibration method for a colorimetric instrument provided in the present application;

[0049] Fig.10 Another schematic diagram of a flow chart of a calibration method for a colorimetric instrument provided in the present application;

[0050] Among them, there are a calibration body 01, a fixed slider 02, an aperture 03, a display module 04, a guide groove 05, a measuring hole 06, a first through hole 07, a second through hole 08, a standard colorimeter 09, a colorimeter to be measured 10, a driving component 11, a cylinder 12, a connecting rod 13, a track 14, a pulley 15, a fixing ring 16, and a shading cloth 17. DETAILED DESCRIPTION

[0051] In the present invention, the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside”, “outside”, “middle”, “vertical”, “horizontal”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation directions of the various components or components.

[0052] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0053] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] The present application provides a calibration device and a calibration method for a colorimetric instrument, which are used to reduce calibration costs and improve the accuracy of calibration measurements. The specific implementation process of the present application is described as follows.

[0057] See also Figures 1 to 7 The present application provides a colorimetric instrument calibration device comprising:

[0058] A calibration body 01, a fixed slider 02 and an aperture 03; a placement space for placing a display module 04 is provided in the calibration body 01, a guide groove 05 is provided on the calibration body 01, a measuring hole 06 is provided in the guide groove 05, and the guide groove 05 is connected to the placement space through the measuring hole 06; the fixed slider 02 is provided in the guide groove 05, a first through hole 07 and a second through hole 08 are provided on the fixed slider 02, the fixed slider 02 is controlled to move along the guide groove 05, so that the first through hole 07 is aligned with the measuring hole 06, or the second through hole 08 is aligned with the measuring hole 06, the fixed slider 02 is used to connect the standard colorimeter 09 and the colorimeter 10 to be measured, when connected, the probe of the standard colorimeter 09 is aligned with the first through hole 07, and the probe of the colorimeter to be measured is aligned with the second through hole 08; the aperture 03 is provided in the measuring hole 06, or is respectively provided in the first through hole 07 and the second through hole 08, and the aperture 03 is controlled to adjust its own aperture size.

[0059] The calibration body 01 has a placement space inside, and the side of the calibration body 01 is set to be hollowed out, and the display module 04 can be placed in the placement space from the hollowed-out side; the guide groove 05 is set above the placement space, and is recessed downward from the upper surface of the calibration body 01. The depth of the recess is determined by the thickness of the fixed slider 02, and the depth can be half the thickness of the fixed slider 02, or other depths. A display screen is set on the display module 04, and the display screen faces the measuring hole 06. The display screen is used to display the test screen in the direction of the measuring hole 06. The display module 04 has a control module inside to control the display function of the display screen.

[0060] The fixed slider 02 is provided with a first through hole 07 and a second through hole 08, both of which pass through the fixed slider 02 from top to bottom. The first through hole 07 and the second through hole 08 have the same shape and size, and are circular in shape. The aperture of the first through hole 07 is also the same as that of the measuring hole 06.

[0061] The diaphragm 03 can be set in the measuring hole 06, and can also be set in the first through hole 07 and the second through hole 08 at the same time. The diaphragm 03 is an automatically adjustable diaphragm 03, that is, the aperture of the diaphragm 03 can be adjusted in size. According to the spot size required for actual calibration, the adjustable diaphragm 03 can be controlled to adjust its own aperture size.

[0062] The length of the guide slot 05 is greater than the length of the fixed slider 02. After the fixed slider 02 is placed in the guide slot 05, it can be controlled to move in the guide slot 05 and move back and forth between the two ends of the guide slot 05. During the movement, the first through hole 07 is aligned with the measuring hole 06, or the second through hole 08 is aligned with the measuring hole 06. When the first through hole 07 is aligned with the measuring hole 06, the standard colorimeter 09, the first through hole 07 (with the aperture 03), and the measuring hole 06 are coaxial. At this time, the standard colorimeter 09 can receive the test screen on the display module 04, and the standard colorimeter 09 can obtain the target light spot on the test screen through the aperture 03; when the second through hole 08 is aligned with the measuring hole 06, the colorimeter 10 to be tested, the second through hole 08 (with the aperture 03), and the measuring hole 06 are coaxial. At this time, the colorimeter 10 to be tested can receive the test screen on the display module 04, and the colorimeter 10 to be tested can obtain the target aperture on the test screen through the aperture 03. The center of the fixed slider 02 is divided into two parts, the first through hole 07 is located in the left part, and the second through hole 08 is located in the right part. During the movement, the end of the left part is abutted against the end of the left side of the guide groove 05, and the second through hole 08 is aligned with the measuring hole 06; the end of the right part is abutted against the end of the right side of the guide groove 05, and the first through hole 07 is aligned with the measuring hole 06. The center of the measuring hole 06 is aligned with the center of the light aperture of the diaphragm 03, and the center of the first through hole 07 is aligned with the center of the light aperture of the diaphragm 03.

[0063] The diaphragm 03 is used to adjust the size of its own aperture, thereby controlling the size of the target light spot that can be obtained by the standard colorimeter 09 / the colorimeter to be measured 10. By adjusting the aperture of the diaphragm 03, it is ensured that the standard colorimeter 09 and the colorimeter to be measured 10 are measured under the same size of light spot, thereby improving the accuracy and consistency of the measurement.

[0064] The connection between the probe of the standard colorimeter 09 and the first through hole 07 is a detachable connection, which can be a threaded connection, a snap connection, etc. Similarly, the connection between the colorimeter to be measured 10 and the second through hole 08 is also a detachable connection.

[0065] In this embodiment, by setting the cooperation between the guide groove 05 and the fixed slider 02, the guide groove 05 provides a moving track for the fixed slider 02, so that in the process of switching the standard colorimeter 09 or the colorimeter to be measured 10 to align with the measuring hole 06, the offset misalignment can be avoided, thereby improving the accuracy of the measurement data;

[0066] By arranging the diaphragm 03 in the two through holes, or arranging the diaphragm 03 in the measuring hole 06, the diaphragm 03 is controlled to adjust the size of its own aperture, so that the size of the light spot measured by the standard colorimeter 09 and the colorimeter 10 to be measured through the diaphragm 03 can be controlled. By adjusting the diaphragm 03, the colorimeter 10 to be measured and the standard colorimeter 09 can measure data under the same size of light spot. When it is necessary to measure measurement areas of different sizes, a single standard colorimeter is used in conjunction with the diaphragm 03 to adjust the size of the light spot entering the standard colorimeter 09, without the need to equip standard instruments of various specifications, thereby reducing the purchase cost of the standard instrument and the complexity of the operation; by adjusting the size of the diaphragm 03, the size of the light spot measured by the standard colorimeter is made the same as the size of the light spot measured by the colorimeter to be measured, thereby improving the accuracy of calibration.

[0067] The fixed slider 02 is arranged to move in the guide groove 05, the probe of the standard colorimeter 09 is fixed on the first through hole 07, and the probe of the colorimeter 10 to be measured is fixed on the second through hole 08. Therefore, a relative darkroom environment (darkroom channel) is formed between the measuring hole 06, the first through hole 07, and the probe of the standard colorimeter 09, which improves the airtightness and can reduce the entry of external light, thereby improving the consistency and reliability of the calibration result.

[0068] In an optional embodiment, the diaphragm 03 is fixed in the measuring hole 06 by a threaded structure, wherein the threaded structure includes an external thread and an internal thread, the external side of the diaphragm 03 is provided with an external thread, and the internal thread is provided in the measuring hole 06, the internal thread matches the external thread of the diaphragm 03, and the connection between the diaphragm 03 and the measuring hole 06 is achieved by the cooperation of the internal thread and the external thread. It can be understood that the connection between the diaphragm 03 and the first through hole and the second through hole can also adopt a threaded structure, and can also be connected by gluing or snapping.

[0069] Please continue reading Figure 7 In another optional embodiment, a shading cloth 17 is provided between the fixed slider 02 and the calibration body 01, and the shading cloth 17 is used to cover the gap between the fixed slider 02 and the guide groove 05; in this embodiment, the shading cloth 17 is connected to the fixed slider 02, extending outward and covering the gap between the fixed slider 02 and the guide groove 05. The shading cloth 17 is provided to reduce the external light from entering the colorimeter, thereby reducing the influence of the external light on the measurement result. Figure 7 In the figure, the shading cloth 17 is redundantly arranged (the inner and outer wavy lines surround and form an area), and can still maintain the covering effect when the fixed slider 02 moves back and forth.

[0070] The inner circle (inner wavy line) of the shading cloth 17 is connected to the fixed slider 02 , and the outer circle (outer wavy line) is connected to the calibration body 01 .

[0071] The movement of the fixed slider 02 can be performed manually. To further improve the accuracy of the movement and ensure that the first through hole 07 or the second through hole 08 can accurately align with the measuring hole 06 when moving back and forth, in an optional embodiment, a driving component 11 is provided between the fixed slider 02 and the guide groove 05. The driving component 11 is used to control the fixed slider 02 to move along the guide groove 05. The driving member is connected to the guide groove 05 and the fixed slider 02 respectively. The main function of the driving component 11 is to control the fixed slider 02 to move along the guide groove 05.

[0072] In this optional embodiment, the driving assembly 11 includes a cylinder 12 and a connecting rod 13. The cylinder 12 is fixed on the calibration body 01. One end of the connecting rod 13 is connected to the telescopic end of the cylinder 12, and the other end is connected to the fixed slider 02. The cylinder 12 and the connecting rod 13 cooperate to control the movement of the fixed slider 02. In this embodiment, the increase and decrease of air pressure (which can be compressed air or other inert gas) realizes the reciprocating linear motion of the piston in the cylinder body. The piston is connected to the telescopic rod, and the telescopic end of the telescopic rod is connected to the connecting rod 13. The connecting rod 13 can be driven to move by starting the cylinder 12. There is a connection between the connecting rod 13 and the fixed slider 02, so when the connecting rod 13 is controlled to move, the fixed slider 02 moves with it.

[0073] In the embodiment of continuing to manually move the fixed slider 02, in order to ensure that the fixed slider 02 does not deviate when moving, in an optional embodiment, a track 14 is provided in the guide groove 05, and a pulley 15 is provided on the side of the fixed slider 02 facing the guide groove 05, and the pulley 15 abuts on the track 14. In this embodiment, one or more tracks 14 are provided inside the guide groove 05 (side or bottom surface), and the track 14 can be made of a smooth metal strip, a plastic strip or other wear-resistant material, and its cross-sectional shape is designed to be able to fit the pulley 15 (such as a triangle) tightly to reduce friction and provide stable support. The pulley 15 is provided on the fixed slider 02, and when the fixed slider 02 is placed in the guide groove 05, the pulley 15 is aligned and contacted with the track 14, and the track 14 is arranged along the length direction of the guide groove 05, and the center line between the first through hole 07 and the second through hole 08 is parallel to the track 14.

[0074] The sizes of the probes corresponding to the colorimeter 10 to be tested or the standard colorimeter 09 of different specifications are also different. A plurality of fixed sliders 02 can be provided, and a suitable fixed slider 02 can be selected according to the colorimeter of different specifications. In addition, a fixed ring 16 can be provided for adaptation.

[0075] Therefore, in an optional embodiment, a fixing ring 16 is provided in the first through hole 07, and the fixing ring 16 is located between the aperture 03 and the probe of the standard colorimeter 09, and the fixing ring 16 is used to fix the probe of the standard colorimeter 09 in the first through hole 07. The fixing ring 16 is provided in the first through hole 07 and above the aperture 03 (the above is the side of the aperture 03 facing away from the display module 04), and in the second through hole 08; the outer diameter of the fixing ring 16 matches the inner diameter of the first through hole 07, and the fixing ring 16 and the first through hole 07 can be connected by threaded connection or snap connection; the inner diameter of the fixing ring 16 matches the outer diameter of the probe, and the fixing ring 16 and the probe can also be connected by threaded connection or snap connection. In this embodiment, without replacing the fixed slider 02, the fixed ring 16 of different specifications can be replaced to meet the requirements of the colorimeter 10 to be tested / the standard colorimeter 09 of different specifications. The cost of the fixed ring 16 is relatively low compared to the cost of the fixed slider 02, and the number of the diaphragms 03 is reduced, so the cost can be reduced.

[0076] In an optional embodiment, a plurality of guide grooves 05 are provided on the calibration body 01, and a measuring hole 06 is provided in each guide groove 05 and runs through the guide groove 05 from top to bottom, and the apertures of the measuring holes 06 on each guide groove 05 are different from each other. Preferably, five guide grooves 05 are provided on the calibration body 01. The dimensions and sizes of each guide groove 05 are the same, and the measuring holes 06 in each guide groove 05 are located at the center of the guide groove 05.

[0077] In this embodiment, a plurality of guide grooves 05 are provided on the calibration body 01, and the plurality of guide grooves 05 can be placed in the fixed slider 02 at the same time, so that multiple sets of calibration work can be performed at the same time, thereby improving the calibration efficiency. In addition, the apertures of each measuring hole 06 are set to be different from each other, and the guide groove 05 corresponding to the measuring hole 06 with a suitable aperture can be selected according to the size of the light spot to be measured to place the fixed slider 02; the measuring area of ​​the display module 04 is adjusted according to the size of the measuring hole 06, and the test screen is displayed at the position facing the measuring hole 06, and the remaining area may not be displayed, thereby reducing energy consumption.

[0078] The above describes the benchmark calibration device, and the calibration method for the benchmark calibration device is described as follows:

[0079] See also Figure 8 An embodiment of a calibration method for a colorimetric instrument provided in the present application includes:

[0080] S1. Determine the test aperture according to the size of the light spot to be tested, adjust the aperture of the diaphragm to be the same as the test aperture, and set the diaphragm in the measuring hole or in the first through hole and the second through hole.

[0081] By adjusting the size of the aperture of the diaphragm, it is ensured that the aperture of the colorimeter to be measured when the light passes through it is consistent with the aperture specified in the standard colorimeter or calibration specification, thereby reducing the measurement error caused by aperture mismatch and improving the accuracy and reliability of calibration.

[0082] The light spot to be tested is set manually, such as a light spot with a diameter of 5 mm or a light spot with a diameter of 10 mm. The aperture of the diaphragm is determined according to the size of the light spot to be tested at the current moment. After the aperture of the diaphragm is adjusted to the same size as the test aperture, the standard colorimeter and the colorimeter to be tested can measure the same light spot (same position, same size).

[0083] The specifications of the colorimetric instrument to be measured include at least the light measurement range, probe size, measurement accuracy, etc.

[0084] S2. Control the fixed slider to be in a standard position. In the standard position, the first through hole on the fixed slider is aligned with the measuring hole, and the probe of the standard colorimeter is connected to the first through hole.

[0085] During the benchmarking calibration process, you first need to obtain the standard value measured by the standard instrument on the test screen, and then obtain the measurement value of the instrument under test on the test screen. The standard value is compared with the measurement value, and the instrument under test is calibrated according to the comparison result.

[0086] Based on this, in this step, the standard position is that the first through hole and the measuring hole are aligned (coaxial), a probe is set on the standard colorimeter, the probe is connected to the first through hole, and the fixed slider is in the guide groove.

[0087] It should be noted that the fixed slider and the display module are located on both sides of the measuring hole, that is, the fixed slider is located on one side of the measuring hole, and the display module is located on the other side of the measuring hole, and the fixed slider and the display module are connected through the measuring hole.

[0088] S3. Control the display module to display a test screen, and control the standard colorimeter to obtain a first standard value of a target light spot on the test screen, where the target light spot is a light spot in an area directly facing the aperture on the test screen.

[0089] This step uses a standard colorimeter to perform an initial measurement of a specific test screen, thereby recording an accurate value that can be used as a calibration benchmark. This value will be used to compare with the measurement value of the colorimeter to be tested in the future to evaluate the accuracy and performance of the colorimeter to be tested.

[0090] In the standard position, an optical path is formed between the display module and the standard colorimeter, and the diaphragm is located in the optical path (the diaphragm is set in the measuring hole or in the first through hole). The diaphragm can change the size of the optical path to control the size of the light beam entering the standard colorimeter.

[0091] The test screen contains specific color, brightness, contrast and other parameters to fully evaluate the performance of the colorimeter. The display module is connected to the external control system, which sets the display parameters according to the requirements and transmits the display parameters to the display module. The display module adjusts according to the display parameters to present the test screen. The area corresponding to the target light spot is part of the test screen.

[0092] After the test screen is displayed, the measurement function of the standard colorimeter is started. The standard colorimeter obtains the information of the target light spot through the aperture and performs colorimetric measurement on the target light spot. The sensor inside the standard colorimeter captures the color information of the target light spot and converts it into a digital signal for processing and analysis. Finally, a numerical value representing the color characteristics of the target light spot is output, which is the first standard value.

[0093] The size of the target light spot acquired by the standard colorimeter is controlled by the aperture of the diaphragm.

[0094] S4. Control the fixed slider to be in a measuring position. In the measuring position, the second through hole on the fixed slider is aligned with the measuring hole, the probe of the colorimeter to be measured is connected to the second through hole, and the colorimeter to be measured is controlled to obtain a first measurement value of the target light spot.

[0095] In this step, the colorimeter to be tested is placed in the measuring position. When in the measuring position, the second through hole is aligned with the measuring hole, and the probe on the colorimeter to be tested is connected to the second through hole. At this time, the probe on the colorimeter to be tested is aligned with the measuring hole. By measuring the same test screen, a preliminary measurement value is obtained. The measurement value will be used to compare with the first standard value obtained in step S3, so as to calibrate the colorimeter to be tested according to the comparison difference (internal parameter revision).

[0096] In the process of changing the fixed slide block from the standard position to the measuring position, the fixed slide block can be moved by manual control, or the fixed slide hole can be moved by automatic control (such as cylinder drive, motor and screw rod drive, etc.).

[0097] At the measuring position, an optical path is formed between the display module and the colorimeter to be tested, and the diaphragm is also set in this optical path (the diaphragm is set in the measuring hole or in the second through hole), and the test picture displayed by the display module is kept unchanged to ensure that the target light spot obtained by the colorimeter to be tested is consistent with the target light spot obtained by the standard colorimeter. The measurement function of the colorimeter to be tested is started to measure the same test picture through the measuring hole and the diaphragm. The color information of the test picture is captured by the sensor inside the colorimeter to be tested, and converted into a digital signal for processing and analysis. Finally, a numerical value representing the color characteristics of the test picture is output, that is, the first measurement value. The first measurement value will be used to compare with the aforementioned first standard value to calibrate the colorimeter to be tested according to the comparison difference (internal parameter revision).

[0098] S5. Calibrate the colorimetric instrument to be measured according to the standard data value and the first measurement value.

[0099] In this step, the internal parameters of the colorimetric instrument to be measured are adjusted according to the difference between the measured value of the standard colorimetric instrument (ie, the first standard value) and the measured value of the colorimetric instrument to be measured (ie, the first measured value).

[0100] The calibration process involves a comparison between a first standard value and a first measured value, and the comparison process involves multiple dimensions in a color space, such as brightness, chromaticity coordinates, etc.

[0101] According to the comparison results, determine which internal parameters need to be adjusted, then determine the specific adjustment values ​​of these parameters that need to be adjusted, and then calibrate the colorimetric instrument to be measured according to these adjustment values ​​and these parameters that need to be adjusted.

[0102] In this step, a judgment process is involved. If the first measured value is the same as the first standard value, or the first measured value is within the error range of the first standard value, it can be considered that the colorimetric instrument to be measured does not need to be calibrated. At this time, the calibration step can be ended, or the subsequent process of judging whether the standard is met can be directly carried out.

[0103] S6. Keep the test screen unchanged and execute steps S2, S3, and S4 again to obtain a second standard value corresponding to the standard colorimeter and a second measurement value corresponding to the calibrated colorimeter to be tested.

[0104] In this step, the calibration result in step S5 is further verified by repeating the previous calibration step and comparing the difference between the new measured value and the standard value.

[0105] Before repeating the calibration verification, it is necessary to ensure that the test pattern remains unchanged in order to eliminate the measurement error caused by the change of the test pattern, so as to more accurately evaluate the calibration effect.

[0106] S7. Determine whether the difference between the second standard value and the second measured value exceeds a preset difference. If not, the calibration is completed. The preset difference is an error value corresponding to the specification of the standard colorimeter.

[0107] In this step, by comparing the difference between the second standard value and the second measured value, it is determined whether the measurement accuracy of the colorimeter to be measured has reached the preset standard, and the preset standard is: the measurement accuracy error range of the standard colorimeter. If the difference is within the error range, it means that the accuracy of the calibrated colorimeter to be measured can meet the requirements of practical applications. If the difference is not within the error range, it means that the accuracy of the calibrated colorimeter to be measured is not met, and the calibration step needs to be repeated.

[0108] For example, the calculation formula for the difference between the second standard value and the second measured value is: Difference = second standard value - second measured value. When the second standard value is 20nit and the second measured value is 20.11nit, the difference is 0.11nit. The accuracy of the standard colorimeter allows an error of ±0.2nit, so the difference is within the error, indicating that the calibrated colorimeter to be measured meets the requirements of practical applications.

[0109] In this embodiment, the size of the target light spot (the size of the light spot that can be obtained by the standard colorimeter / the colorimeter to be measured through the diaphragm) is first controlled by adjusting the aperture of the diaphragm, ensuring that the standard colorimeter and the colorimeter to be measured are measured under the same size of light spot, thereby improving the accuracy and consistency of the measurement; and when calibrating the colorimeter to be measured with different specifications, only the size of the diaphragm needs to be adjusted, without the need to replace a variety of standard colorimeter instruments, thereby reducing the purchase cost of the standard colorimeter instrument; the colorimeter to be measured is preliminarily calibrated by comparing the first standard value with the first measured value, and then the difference between the first standard value and the second measured value is compared with the preset difference, and it is judged whether the calibrated colorimeter to be measured has completed the calibration by comparing the result.

[0110] After calibrating the colorimeter to be measured, you can use other calibration screens to perform benchmark verification on the calibrated colorimeter to be measured to ensure that the calibrated colorimeter to be measured meets the use standards. The specific benchmark verification steps are as follows:

[0111] Please continue reading Fig. 9 Another embodiment of a calibration method for a colorimetric instrument provided by the present application includes:

[0112] S8. Set a number of inspection screens according to preset rules.

[0113] In this step, a series of test screens are set up to comprehensively evaluate the stability and accuracy of the calibrated colorimetric instrument under different color, brightness and other conditions.

[0114] The test screen is determined according to the application scenario and specification parameters of the colorimetric instrument to be tested, including parameters such as color, brightness, contrast, etc. When setting the test screen, multiple test screens can be set according to different brightness under the same color, and the brightness of each test screen is different; or different display colors can be set under the same brightness, and the display color of each test screen is different.

[0115] In the future, the inspection screen can be quickly called for display during the verification process. All designed inspection screens can be integrated into an inspection screen library and input into the display module for display through an external control system.

[0116] S9. Control the display module to display each test screen respectively, repeat steps S2, S3, and S4 for each test screen, and obtain a third standard value and a third measurement value corresponding to each test screen. The third measurement value is measured by a calibrated colorimeter to be tested, and the third standard value is measured by a standard colorimeter.

[0117] Each inspection screen is called from the inspection screen library in turn and displayed through the display module. For each displayed inspection screen, steps S2 to S4 are repeatedly performed, including adjusting the measurement position of the colorimeter to be tested, ensuring coaxiality, using the standard colorimeter to measure and obtain the third standard value, and using the colorimeter to be tested to measure and obtain the third measurement value, and each third measurement value and each third standard value are recorded for subsequent analysis.

[0118] For the convenience of analysis, the third standard value and the third measured value obtained from each inspection frame may be grouped together, so that the same number of groups as the number of inspection frames may be obtained.

[0119] S10, calculating a target difference corresponding to each inspection screen, wherein the target difference is obtained by subtracting a third standard value corresponding to each inspection screen from a third measurement value.

[0120] In this step, the target difference value corresponding to each inspection picture (ie, the difference between the third standard value and the third measured value) is calculated to evaluate the measurement error of the colorimetric instrument to be tested.

[0121] The recorded third standard value and the third measured value are sorted to ensure that each inspection screen has a corresponding set of data, and a target difference is calculated for each set of data, that is, the difference between the third standard value and the third measured value.

[0122] S11. If the target differences corresponding to all the inspection images do not exceed the preset differences, it is determined that the calibrated colorimetric instrument to be tested meets the standards.

[0123] In the above steps S1-S7, the colorimetric instrument to be tested is calibrated initially and the calibration result is checked; and in steps S8-S11, the calibrated colorimetric instrument to be tested is judged to be up to standard. In this step, the calculated target difference is compared with the preset difference to judge whether the calibrated colorimetric instrument to be tested is up to standard, that is, whether it meets the use standard.

[0124] The preset difference is the error range of the standard colorimeter. If the target difference corresponding to each inspection screen falls within the error range, it means that the calibrated colorimeter has reached the standard and can be put into / continued use. If it is not within the error range, it means that the calibration is inaccurate and needs to be recalibrated or the problem in the calibration process needs to be checked.

[0125] In this embodiment, through the setting and measurement of multiple inspection screens, the calibrated colorimetric instrument to be tested can be comprehensively evaluated and verified, thereby improving the measurement accuracy and stability of the colorimetric instrument to be tested.

[0126] See also Fig.10 Another embodiment of a calibration method for a colorimetric instrument provided by the present application includes:

[0127] 301. Determine the brightness range according to the specifications of the standard colorimetric instrument, and divide the brightness range into several brightness intervals on average;

[0128] The measurement range is from the minimum measurable brightness of the instrument to the maximum measurable brightness, ensuring that the selected brightness range can cover all brightness conditions that the colorimetric instrument to be measured may encounter in actual applications.

[0129] After the brightness range is determined, the range is evenly divided into several brightness intervals. The brightness range of each interval is equal to ensure that the same number of brightness values ​​in each interval are selected to generate the test picture.

[0130] For example, the brightness range is 0.01nit-100nit, which can be divided into 0.01-0.1, 0.1-1, 1-10, and 10-100.

[0131] 302. Take at least 5 groups of brightness value data in each brightness interval to obtain a brightness value data set;

[0132] At least 5 sets of brightness value data are selected in each brightness interval. The brightness value data are evenly distributed within the brightness range of the interval to ensure the comprehensiveness and accuracy of the measurement.

[0133] All selected brightness value data are integrated into a brightness value data set. The brightness value data set will be used to generate the inspection screen later.

[0134] For example, five groups of brightness value data are taken in the range of 0.1-1nit, namely 0.1nit, 0.25nit, 0.5nit, 0.75nit, and 1nit. Therefore, a test screen is generated for each brightness value.

[0135] 303. Generate a plurality of test images according to the brightness value data set, one test image corresponding to one set of brightness value data, and input the plurality of test images into the display module.

[0136] According to the brightness value data set (composed of several brightness value data), a corresponding test screen is generated for each brightness value data. The generated test screen is input into the display module for display. Each time a test screen is displayed, steps S2, S3, and S4 are executed once to generate the standard value and the measured value corresponding to the test screen. By comparing the measurement results of the two, the measurement accuracy and stability of the colorimetric instrument to be tested can be evaluated.

[0137] In addition, when generating the inspection screen, corresponding inspection screens can be generated for different colors, as follows:

[0138] Determine a test color, the test color is different from the color of the test screen; generate a plurality of target test screens according to the test color and brightness value data set, the colors of the plurality of target test screens are all the test color.

[0139] The color can be a pure color or a combination of colors with a specific hue, saturation, and brightness. The test color should be different from the color of the test screen to avoid confusion and misjudgment. For example, if the test screen is gray, the test color can be a pure color such as red, blue, or green to form a sharp visual contrast.

[0140] Once the test color is determined, we can generate several target test images based on the brightness value data set. For example, when red is selected as the test color and the brightness value data set contains multiple brightness values ​​from 0.01nit to 100nit, a series of red target test images can be generated, each with a different brightness, covering the entire range from very low brightness to high brightness.

[0141] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A calibration device for a colorimetric instrument, characterized in that: include: Calibration body, fixed slider and aperture; A placement space for placing a display module is provided in the calibration body, a guide groove is provided on the calibration body, a measuring hole is provided in the guide groove, and the guide groove is connected to the placement space through the measuring hole; The fixed slider is arranged in the guide groove, and a first through hole and a second through hole are arranged on the fixed slider. The fixed slider is controlled to move along the guide groove so that the first through hole is aligned with the measuring hole, or the second through hole is aligned with the measuring hole. The fixed slider is used to connect the standard colorimeter and the colorimeter to be measured. When connected, the probe of the standard colorimeter is aligned with the first through hole, and the probe of the colorimeter to be measured is aligned with the second through hole. The diaphragm is arranged in the measuring hole, or is respectively arranged in the first through hole and the second through hole, and the diaphragm is controlled to adjust the aperture size of its own diaphragm.

2. The calibration device according to claim 1, characterized in that: The diaphragm is fixed in the measuring hole via a threaded structure.

3. The calibration device according to claim 1, characterized in that: A shading cloth is arranged between the fixed slider and the calibration body, and the shading cloth is used to cover the gap between the fixed slider and the guide groove.

4. The calibration device according to any one of claims 1 to 3, characterized in that: A driving assembly is arranged between the fixed slider and the guide groove, and the driving assembly includes a cylinder and a connecting rod. The cylinder is fixed on the calibration body, one end of the connecting rod is connected to the telescopic end of the cylinder, and the other end is connected to the fixed slider. The cylinder and the connecting rod cooperate to control the movement of the fixed slider.

5. The calibration device according to any one of claims 1 to 3, characterized in that: A track is arranged in the guide groove, and a pulley is arranged on a side of the fixed sliding block facing the guide groove, and the pulley abuts against the track.

6. The calibration device according to any one of claims 1 to 3, characterized in that: A fixing ring is arranged in the first through hole, and the fixing ring is located between the diaphragm and the probe of the standard colorimeter. The fixing ring is used to fix the probe of the standard colorimeter in the first through hole.

7. The calibration device according to any one of claims 1 to 3, characterized in that: The calibration body is provided with a plurality of guide grooves, each of which is provided with a measuring hole penetrating vertically, and the apertures of the measuring holes on each guide groove are different from each other.

8. A method for calibrating a colorimetric instrument, characterized in that: The calibration device according to any one of claims 1 to 7, wherein the calibration method comprises: S1. Determine the test aperture according to the size of the light spot to be tested, adjust the aperture of the diaphragm to be the same as the test aperture, and set the diaphragm in the measuring hole or in the first through hole and the second through hole; S2, controlling the fixed slider to be in a standard position, in which the first through hole on the fixed slider is aligned with the measuring hole, and the probe of the standard colorimeter is connected to the first through hole; S3, controlling the display module to display a test screen, and controlling the standard colorimeter to obtain a first standard value of a target light spot on the test screen, wherein the target light spot is a light spot in an area on the test screen directly facing the aperture; S4, controlling the fixed slider to be in a measuring position, in which the second through hole on the fixed slider is aligned with the measuring hole, the probe of the colorimeter to be measured is connected to the second through hole, and controlling the colorimeter to be measured to obtain a first measurement value of the target light spot; S5, calibrating the colorimetric instrument to be measured according to the standard data value and the first measurement value; S6, keeping the test screen unchanged, executing steps S2, S3, and S4 again, obtaining a second standard value corresponding to the standard colorimeter and a second measurement value corresponding to the calibrated colorimeter to be tested; S7. Determine whether the difference between the second standard value and the second measured value exceeds a preset difference. If not, complete the calibration. The preset difference is an error value corresponding to the specification of the standard colorimeter.

9. The calibration method according to claim 8, characterized in that: After the calibration is completed, the calibration method further includes: S8. Setting a number of inspection screens according to preset rules; S9, controlling the display module to display each inspection screen respectively, repeating steps S2, S3, and S4 for each inspection screen, and obtaining a third standard value and a third measurement value corresponding to each inspection screen, wherein the third measurement value is measured by a calibrated colorimeter to be measured, and the third standard value is measured by the standard colorimeter; S10, calculating a target difference value corresponding to each inspection screen, wherein the target difference value is obtained by subtracting the third standard value corresponding to each inspection screen from the third measurement value; S11. If the target differences corresponding to all the inspection images do not exceed the preset difference, it is determined that the calibrated colorimetric instrument to be tested meets the standard.

10. The calibration method according to claim 9, characterized in that: The setting of several inspection screens according to preset rules includes: Determine a brightness range according to the specifications of the standard colorimeter, and evenly divide the brightness range into a plurality of brightness intervals; Taking at least 5 groups of brightness value data in each brightness interval to obtain a brightness value data set; A plurality of inspection pictures are generated according to the brightness value data set, one inspection picture is generated corresponding to one set of brightness value data, and the plurality of inspection pictures are input into the display module.

11. The calibration method according to claim 10, characterized in that: The step of generating a plurality of inspection pictures according to the brightness value data set comprises: Determining a test color, wherein the test color is different from a color of the test picture; A plurality of target inspection pictures are generated according to the inspection color and the brightness value data set, and the colors of the plurality of target inspection pictures are all inspection colors.

Images