Spectrum correction type imaging colorimeter and chromaticity coordinate measuring method

Abstract

The invention discloses a spectrum correction type imaging colorimeter and a chromaticity coordinate measuring method. The spectrum correction type imaging colorimeter is used for reducing the rotating angle of a wheel rotating disc when chromaticity coordinates are measured. The colorimeter comprises a colorimeter main body, a wheel rotating disc and a conduction assembly, the wheel rotating disc and the conduction assembly are respectively arranged on the colorimeter main body; a shooting lens and a measuring plate which are adjacent to each other are arranged on the wheel rotating disc, the measuring plate is divided into a first part and a second part, the measuring plate is circular, the circle center of the measuring plate is located in the second part, a reflecting prism is arranged in the first part, and the distance from the geometric center to the rotating center of the reflecting prism is equal to that of the reflecting prism; the distance from the circle center of the shooting lens to the rotation center is equal; the wheel turntable has a shooting position and a measuring position, and at the shooting position, the shooting lens and the incident light path are coaxial; at the measuring position, the wheel rotating disc is controlled to rotate, so that the reflecting prism is coaxial with the incident light path, the reflecting direction of the reflecting prism is coaxial with the arrangement direction of the conduction assembly, and the conduction assembly is used for being connected with a spectrograph.

Description

Technical Field

[0001] The present application relates to the technical field of brightness and chromaticity detection, and in particular to a spectrally corrected imaging colorimeter and a color coordinate measurement method. Background Art

[0002] The spectrally corrected imaging colorimeter is a high-precision measuring device that uses a color camera to take a picture of the entire object to be measured, and then extracts the RGB components of each pixel. Using a specific software algorithm, the extracted RGB components are converted into color coordinates (XYZ), thereby achieving accurate measurement of the object's color.

[0003] The existing spectrally corrected imaging colorimeter is provided with a shooting position and a measuring position. A reflector (plane or prism) is arranged at the center of the measuring position. A picture of the object to be measured is taken at the shooting position, and then the measurement position is adjusted. The incident light is reflected into the optical fiber by the reflector in the measuring position, and the incident light at the center of the picture is introduced into the spectrophotometer by the optical fiber. The light is decomposed by the spectrophotometer and the intensity of different wavelengths in the light is measured to determine the color coordinates of the center point of the light. The color coordinates of the center point are used to feedback and correct the color coordinates of the picture obtained by shooting and calculating the entire camera, and then the shooting position and the measuring position are switched cyclically for measurement.

[0004] In the process of repeated switching of measurements, since the angle between the shooting position and the measuring position is large, a long switching time is required during repeated rotation and switching, resulting in a long overall cycle time and low measurement efficiency. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a spectrally corrected imaging colorimeter and a color coordinate measurement method, which can reduce the rotation angle of the rotary disk when measuring color coordinates and reduce the cycle time between shooting and measurement.

[0006] The first aspect of the present application provides a spectrally corrected imaging colorimeter, comprising:

[0007] Colorimeter body, wheel disc and transmission components;

[0008] The rotating disk and the conducting assembly are respectively arranged on the colorimeter body, the rotating disk is connected to a driving member on the colorimeter body through a connecting member, and the driving member is used to control the rotation of the rotating disk through the connecting member;

[0009] The rotating disk is provided with adjacent photographing lenses and measuring plates, the photographing lenses are used to connect the colorimeter body with the incident light path, the measuring plate is divided into a first part and a second part, the measuring plate is circular and the center of the measuring plate is located in the second part, the first part is the part close to the photographing lenses, a reflecting prism is provided in the first part, and the distance from the geometric center of the reflecting prism to the rotation center is equal to the distance from the center of the photographing lens to the rotation center, and there is an angle between the mirror surface on the reflecting prism and the measuring plate;

[0010] The rotating disk has a shooting position and a measuring position. In the shooting position, the shooting lens is coaxial with the incident light path. In the measuring position, the rotating disk is controlled to rotate so that the reflecting prism is coaxial with the incident light path, and the reflecting direction of the reflecting prism is coaxial with the arrangement direction of the transmitting component, and the transmitting component is used to connect with the spectrometer.

[0011] Optionally, the reflecting prism is in contact with an edge of the measuring plate.

[0012] Optionally, the angle between the mirror and the measuring plate is 45 degrees.

[0013] Optionally, a turntable is provided at the bottom of the reflection prism, the reflection prism is fixed to the measuring plate via the turntable, and the reflection prism is controlled to rotate on the turntable.

[0014] Optionally, two adjacent neutral density filters are further arranged on the rotating disk, and the two neutral density filters, the shooting lens, and the measuring plate are located on the same plane.

[0015] Optionally, a line connecting the rotation center to the center of the photographing lens is perpendicular to a line connecting the rotation center to the center of the measuring plate.

[0016] Optionally, the transmission component includes a support base and an optical fiber, the support base is connected to the colorimeter body, the first end of the optical fiber is fixed on the support base, and the second end of the optical fiber is used to connect to a spectrometer.

[0017] Optionally, the support seat includes a base and a rotating fixed seat, a track is provided on the colorimeter body, the base is movably connected to the track, the rotating fixed seat is fixed to the base, and the rotating fixed seat is controllably rotatable.

[0018] The second aspect of the present application provides a color coordinate measurement method, which is applied to the above-mentioned first aspect and any optional spectrally corrected imaging colorimeter in the first aspect, comprising:

[0019] S1. Based on the arrangement direction of the optical fiber on the colorimeter body, a reflecting prism is arranged between the center of the measuring plate and the photographing lens, and the reflecting direction of the reflecting prism is adjusted so that the reflecting direction is coaxial with the arrangement direction;

[0020] S2. The control wheel is rotated so that the photographing lens is coaxial with the incident light path, the incident light path is photographed through the colorimeter body, and the first color coordinates of the photographed image are measured;

[0021] S3. Control the rotation of the rotary disk so that the reflecting prism is coaxial with the incident light path, so that the incident light path is reflected by the reflecting prism to form an outgoing light path, the outgoing light path is coaxial with the optical fiber, and the outgoing light path is guided into the spectrometer through the optical fiber;

[0022] S4. Control the spectrometer to measure the color coordinates of the center point of the outgoing light path, and calibrate the first color coordinates based on the color coordinates of the center point;

[0023] S5. The control wheel turns to rotate to cyclically execute steps S2, S3 and S4.

[0024] Optionally, arranging a reflecting prism between the center of the measuring plate and the photographing lens, and adjusting a reflecting direction of the reflecting prism so that the reflecting direction is coaxial with the arranging direction, comprises:

[0025] A virtual optical axis circle is made with the distance from the center of the shooting lens to the rotation center of the rotating disk as the radius and the rotation center as the center;

[0026] Determine the arc where the virtual optical axis circle intersects the measuring plate, divide it by the center of the measuring plate, determine the target arc close to the side of the shooting lens, and the center of the measuring plate is not on the target arc;

[0027] Determining a mounting point of the reflective prism on the target arc, wherein the mounting point coincides with a geometric center of the reflective prism, and at the mounting point, the reflective prism contacts an inner edge of the measuring plate;

[0028] Based on the arrangement direction of the optical fiber, the reflection direction of the reflection prism is adjusted so that the reflection direction is coaxial with the arrangement direction.

[0029] It can be seen from the above technical solutions that this application has the following effects:

[0030] The present application arranges a photographing lens and a measuring plate on a rotating disk, and the measuring plate is divided into a first part and a second part. A reflecting prism is arranged in the first part, and the first part is a part close to the photographing lens, and the center of the measuring plate is in the area of ​​the second part, and the distance from the geometric center of the reflecting prism to the rotation center is equal to the distance from the center of the photographing lens to the rotation center, and there is an angle between the mirror surface on the reflecting prism and the measuring plate; the rotating disk of the present application has a photographing position and a measuring position, in the photographing position, the photographing lens is coaxial with the incident light path, in the measuring position, the rotating disk is controlled to rotate so that the reflecting prism is coaxial with the incident light path, and the reflecting direction of the reflecting prism is coaxial with the arrangement direction of the conducting component, and the conducting component is used to connect with the spectrometer, and the rotating disk is controlled to rotate and switch back and forth between the measuring position and the photographing position, thereby, compared with the prior art in which the reflecting prism is arranged at the center of the measuring plate, the present application arranges the reflecting prism on the first part of the measuring plate close to the photographing lens, and when switching back and forth, the rotation angle between the photographing lens and the measuring plate can be reduced, thereby reducing the rotation beat and improving the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 A schematic diagram of a spectrally corrected imaging colorimeter for the present application;

[0033] Figure 2 Another schematic diagram of a spectrally corrected imaging colorimeter of the present application;

[0034] Figure 3 Another schematic diagram of a spectrally corrected imaging colorimeter of the present application;

[0035] Figure 4 Another schematic diagram of a spectrally corrected imaging colorimeter of the present application;

[0036] Figure 5 This is a schematic diagram of the cooperation between a support base and a track in a spectral correction imaging colorimeter of the present application;

[0037] Figure 6 A schematic diagram of a reflective prism in a spectrally corrected imaging colorimeter of the present application;

[0038] Figure 7 A schematic diagram of a color coordinate measurement method for the present application;

[0039] Figure 8 A schematic diagram of a process for positioning a reflective prism in a color coordinate measurement method of the present application;

[0040] Among them, the colorimeter body 01, the rotating disk 02, the transmission component 03, the belt 04, the reflecting prism 05, the lens 06, the supporting seat 07, the optical fiber 08, the track 09, the base 10, the rotating fixed seat 11, the turntable 12, the pulley 13, the shooting lens 14, the neutral density filter 15, and the measuring plate 16. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The present application provides a spectrally corrected imaging colorimeter and a color coordinate measurement method, which are used to reduce the rotation angle of the rotary disk when measuring color coordinates and reduce the takt time between shooting and measurement. The specific implementation process of the present application is described as follows.

[0047] See also Figures 1 to 6 The first aspect of the present application provides a spectrally corrected imaging colorimeter comprising:

[0048] A colorimeter body 01, a rotating disk 02 and a conducting component 03; the rotating disk 02 and the conducting component 03 are respectively arranged on the colorimeter body 01, the rotating disk 02 is connected to a driving component on the colorimeter body 01 through a connecting member, and the driving component is used to control the rotation of the rotating disk 02 through the connecting member; the rotating disk 02 is provided with an adjacent photographing lens 14 and a measuring plate 16, the photographing lens 14 is used to conduct the colorimeter body 01 with the incident light path, and the measuring plate 16 is divided into a first part and a second part, the measuring plate 16 is circular and the center of the measuring plate 16 is in the second part, and the first part is close to the photographing lens 14, a reflecting prism 05 is arranged in the first part, and the distance from the geometric center of the reflecting prism 05 to the rotation center is equal to the distance from the center of the circle of the shooting lens 14 to the rotation center, and there is an angle between the mirror surface on the reflecting prism 05 and the measuring plate 16; the rotating disk 02 has a shooting position and a measuring position, in the shooting position, the shooting lens 14 is coaxial with the incident light path; in the measuring position, the rotating disk 02 is controlled to rotate so that the reflecting prism 05 is coaxial with the incident light path, and the reflecting direction of the reflecting prism 05 is coaxial with the arrangement direction of the conducting component 03, and the conducting component 03 is used to connect with the spectrometer.

[0049] The colorimeter body 01 is connected to the lens 06, and the incident light path is transmitted from the direction of the lens 06. The colorimeter body 01 is provided with an analysis and processing module, which can analyze and process the image taken at the shooting position to measure the color coordinates of the taken image. The lens 06 is detachably connected to the colorimeter body 01 by means of a buckle, a thread, a bolt, etc.

[0050] The driving part is a motor, the connecting part is a belt 04, a pulley 13 is arranged on the motor, and the motor can control the rotation of the pulley 13. The pulley 13 is connected to the outer ring of the rotating disk 02 through the belt 04. Therefore, when the pulley 13 rotates, the rotating disk 02 rotates accordingly, and the rotation center of the rotating disk 02 is the center position of its circle.

[0051] The rotating disk 02 is arranged on the colorimeter body 01, and the center of the rotating disk 02 is connected to the colorimeter body 01 through a rotating shaft, and the rotating disk 02 can be controlled to rotate around the rotating shaft; a shooting lens 14 and a measuring board 16 are respectively arranged on the rotating disk 02, and the shooting lens 14 and the measuring board 16 are on the same plane, and the shooting lens 14 and the measuring board 16 are adjacent to each other, and the shooting lens 14 can allow the incident light path to pass through, and the shooting lens 14 can be a transparent glass, so that in the shooting position, the incident light path can pass through the shooting lens 14 to reach the colorimeter body 01.

[0052] The reflecting prism 05 is set on the measuring plate 16, and the straight line determined between the rotation center and the center of the measuring plate 16 is used as a dividing line. The measuring plate 16 is divided into two parts by the dividing line. The part close to the shooting lens 14 is the first part, and the part relatively far from the shooting lens 14 is the second part. The center of the measuring plate 16 is within the area of ​​the second part. Therefore, when the geometric center of the reflecting prism 05 is set at any position in the first part, it will not coincide with the center of the measuring plate 16, and the edge of the reflecting prism 05 will not exceed the edge of the measuring plate 16.

[0053] In order to ensure that the reflecting prism 05 can be aligned with the axial center of the incident light path, the distance from the geometric center of the reflecting prism 05 to the rotation center is set equal to the distance from the rotation center to the center of the measuring lens.

[0054] The reflecting prism 05 is tilted on the measuring plate 16 , that is, there is an angle between the mirror surface of the reflecting prism 05 and the measuring plate 16 , so when the incident light path is irradiated on the mirror surface of the reflecting prism 05 , the reflecting prism 05 can reflect the incident light path at other angles.

[0055] The rotating disk 02 has a measuring position and a shooting position. The rotating disk 02 is controlled to rotate so that the rotating disk 02 switches between the measuring position and the shooting position. When switching to the shooting position, the lens 06 is aligned with the shooting lens 14, and the center of the incident light path penetrating from the lens 06 coincides with the center of the circle of the shooting lens 14. At this time, the colorimeter body 01 can shoot and detect the incident light path through the shooting lens 14.

[0056] When the rotary disk 02 is switched to the measuring position, the reflecting prism 05 is coaxial with the incident light path. Coaxial means that the optical axes of the reflecting prism 05 and the incident light path coincide. The incident light path is irradiated on the mirror surface of the reflecting prism 05. Because there is an angle between the mirror surface and the measuring plate 16, the mirror surface reflects the incident light path at other angles. Since the reflection direction of the mirror surface is coaxial with the transmission component 03, the reflected light path reaches the spectrometer after being guided by the transmission component 03.

[0057] It should be noted that, at the measuring position, only the reflecting prism 05 is located at the center position of the lens 06 (the center position of the optical axis of the incident light path), and the measuring plate 16 does not need to be aligned with the lens 06 .

[0058] In this embodiment, a shooting lens 14 and a measuring plate 16 are arranged on the rotating disk 02, and the measuring plate 16 is divided into a first part and a second part. The reflecting prism 14 is arranged in the first part, and the first part is the part close to the shooting lens 14. The center of the measuring plate 16 is located in the area of ​​the second part. The distance from the geometric center of the reflecting prism 05 to the rotation center is equal to the distance from the center of the shooting lens 14 to the rotation center. There is an angle between the mirror surface on the reflecting prism 05 and the measuring plate 16. The rotating disk 02 has a shooting position and a measuring position. In the shooting position, the shooting lens 14 is coaxial with the incident light path, and in the measuring position, the shooting lens 14 is coaxial with the incident light path. The measuring position is set, the rotating disk 02 is controlled to rotate so that the reflecting prism 05 is coaxial with the incident light path, and the reflecting direction of the reflecting prism 05 is coaxial with the arrangement direction of the conducting component 03. The conducting component 03 is used to be connected to the spectrometer. The rotating disk 02 is controlled to rotate and switch back and forth between the measuring position and the shooting position. Therefore, compared with the prior art in which the reflecting prism 05 is set at the center of the measuring plate 16, the present application sets the reflecting prism 05 on the side of the measuring plate 16 close to the shooting lens 14. When switching back and forth, the rotation angle between the shooting lens 14 and the measuring plate 16 can be reduced, thereby reducing the rotation beat and improving the measurement efficiency.

[0059] In an optional embodiment, the reflecting prism 05 contacts the inner edge of the measuring plate 16. By contacting the reflecting prism 05 with the inner edge of the measuring plate 16, it is ensured that the reflecting prism 05 is located closest to the shooting lens 14 on the measuring plate 16. This position is the preferred position of the present application. At this position, the time taken by the turntable 02 to switch back and forth between the shooting position and the measuring position is the shortest.

[0060] In an optional embodiment, the angle between the mirror on the reflecting prism 05 and the measuring plate 16 is 45 degrees, the measuring plate 16 is perpendicular to the incident light path, and the angle between the mirror on the reflecting prism 05 and the incident light path is also 45 degrees. Based on this, the reflected light path is parallel to the measuring plate 16, the arrangement direction of the conducting component 03 is also parallel to the measuring plate 16, and is coaxial with the reflected light path, and the reflected light path is irradiated onto the conducting component 03.

[0061] In an optional embodiment, two adjacent neutral density filters 15 are further disposed on the rotating disk 02 . The two neutral density filters 15 are located on the same plane as the shooting lens 14 and the measuring plate 16 , and the light transmittances of the two neutral density filters 15 are different.

[0062] In this embodiment, a line connecting the rotation center of the rotating disk 02 to the center of the photographing lens 14 is perpendicular to a line connecting the rotation center of the rotating disk 02 to the center of the measuring plate 16 .

[0063] The size of the shooting lens 14 is equal to that of the neutral density filter 15 and the measuring board 16; the two neutral density filters 15 are adjacent to each other, one neutral density filter 15 is adjacent to the shooting lens 14 and the other neutral density filter 15 is adjacent to the measuring board 16, thereby ensuring that the shooting lens 14 and the measuring board 16 are adjacent and close to each other.

[0064] A total of four circles, including two neutral density filters 15, a photographing lens 14 and a measuring plate 16, are on the rotating disk 02. The distance between any two adjacent circles is the same, and the angle between any two adjacent circles is also the same (the angle between the lines connecting the centers of the two adjacent circles to the rotation center), and is 90 degrees.

[0065] The measuring plate 16 is adjacent to one of the neutral density filters 15 , and a line connecting the center of the measuring plate 16 and the center of the other neutral density filter 15 passes through the rotation center.

[0066] The reflective prism 05 in the measuring plate 16 is as close to the photographing lens 14 as possible, and the position of the reflective prism 05 does not exceed the area where the measuring plate 16 is located, and the distance from the geometric center of the reflective prism 05 to the rotation center is kept equal to the distance from the center of the circle of the photographing lens 14 to the rotation center. In actual work, the rotary disk 02 is first controlled to be in the shooting position. At this time, the colorimeter body 01 uses the camera inside it to shoot the incident light path penetrating the lens 06 through the photographing lens 14. After the shooting is completed, the rotary disk 02 is then controlled to rotate so that the rotary disk 02 is in the measuring position. At this time, the reflective prism 05 is coaxial with the incident light path. The reflective prism 05 reflects the incident light path into the transmission component 03, and then guides it to the spectrometer for analysis through the transmission component 03. Subsequently, the second round of shooting and measurement, the third round, the fourth round, and so on are carried out.

[0067] The neutral density filter 15 is used to adjust the intensity of light entering the camera. The two neutral density filters 15 have different light transmittances and can absorb or reflect different proportions of light respectively. In actual use, in order to reduce the problem of excessive light brightness affecting the measurement results, two neutral density filters 15 with different transmittances are set. The wheel dial 02 is controlled to rotate according to needs, so that the required neutral density filter 15 is coaxial with the incident light path, thereby reducing the brightness of the camera when taking pictures.

[0068] In an optional embodiment, the transmission component 03 includes a support seat 07 and an optical fiber 08, the support seat 07 is connected to the colorimeter body 01, the first end of the optical fiber 08 is fixed on the support seat 07, and the second end of the optical fiber 08 is used to connect to the spectrometer. In this embodiment, the support seat 07 is used to fix and support the optical fiber 08, ensure the stability and accuracy of the optical fiber 08 in the process of transmitting the optical signal, and prevent signal interference or loss caused by the movement or vibration of the optical fiber 08; the arrangement direction of the first end of the optical fiber 08 is coaxial with the light path reflected from the reflection prism 05, and the light path is irradiated on the end face of the first end.

[0069] In this optional embodiment, the support seat 07 includes a base 10 and a rotating fixed seat 11, a track 09 is provided on the colorimeter body 01, the base 10 is movably connected to the track 09, the rotating fixed seat 11 is fixed on the base 10, and the rotating fixed seat 11 is controlled to rotate. In this embodiment, the track 09 is provided on the colorimeter body 01, the base 10 of the support seat 07 can be controlled to move on the track 09, the position of the support seat 07 and the optical fiber 08 can be changed by the track 09, the rotating fixed seat 11 is provided on the base 10, the rotating fixed seat 11 can rotate on the base 10, the rotating fixed seat 11 is used to clamp and fix the optical fiber 08, and the arrangement direction of the optical fiber 08 can be controlled by providing the rotating fixed seat 11. Therefore, by setting the track 09 and the rotating fixed seat 11, the position and arrangement direction of the optical fiber 08 can be adjusted according to the shape and arrangement requirements of the colorimeter body 01. It should be noted that after the position of the optical fiber 08 is adjusted, the optical fiber 08 still needs to be adjusted to be coaxial with the light path reflected from the reflecting prism 05. The reflection direction of the reflecting prism 05 can be adjusted according to the position of the optical fiber 08, and the position and arrangement direction of the optical fiber 08 can also be adjusted according to the reflection direction.

[0070] In this optional embodiment, in order to adapt to the change in the position and arrangement direction of the optical fiber 08, the optical fiber 08 is still coaxial with the outgoing light path. Therefore, in order to adjust the reflection direction of the reflection prism 05 according to the arrangement direction of the transmission component 03, a turntable 12 is provided at the bottom of the reflection prism 05, and the reflection prism 05 is fixed on the measurement board 16 through the turntable 12. The reflection prism 05 is controlled to rotate on the turntable 12. The turntable 12 is fixed on the measurement board 16 by bolts, screws, buckles or adhesion.

[0071] See also Figure 7 The second aspect of the present application provides a color coordinate measurement method, which is applied to the above Figures 1 to 6 The spectrally corrected imaging colorimeter as described in any one of the embodiments comprises:

[0072] S1. Based on the arrangement direction of the optical fiber on the colorimeter body, arrange a reflecting prism between the center of the measuring plate and the photographing lens, and adjust the reflecting direction of the reflecting prism so that the reflecting direction is coaxial with the arrangement direction.

[0073] Based on the spectral correction imaging colorimeter, in order to reduce the rotation angle of the rotary disk and reduce the rotation beat, the position of the reflective prism is placed on the measuring board, and the geometric center of the reflective prism does not coincide with the center of the measuring board. The geometric center of the reflective prism is located on the side of the measuring board close to the shooting lens (but not beyond the range of the measuring board);

[0074] In this step, the function of the reflecting prism is to reflect the incident light path into the optical fiber, thereby guiding the optical fiber to the spectrometer. The light path reflected from the reflecting prism is completely coaxial with the arrangement direction of the optical fiber, that is, the light propagates into the optical fiber along the expected light path without deflection or scattering.

[0075] After the position of the reflective prism is arranged, if the shooting lens is coaxial with the incident light path at the start of operation, shooting is performed directly; if not coaxial, step S2 is executed.

[0076] S2. The control wheel turns to rotate so that the photographing lens is coaxial with the incident light path, the incident light path is photographed through the colorimeter body, and the first color coordinate of the photographed image is measured.

[0077] When the shooting lens is coaxial with the incident light path (the center or center of the shooting lens is aligned with the axis of the incident light path), the colorimeter body shoots the incident light path through the internal camera to measure the color characteristics of the incident light path, and specifically determines the color coordinates by analyzing the different wavelength components in the light.

[0078] The first color coordinates are obtained by measuring the captured image by the analysis and processing module inside the colorimeter body. The first color coordinates at least include the color coordinates of the center point of the captured image and the color coordinates of other points on the captured image.

[0079] The rotation of the rotating disk is achieved by controlling the driving member provided in the colorimeter. During the rotation, the starting coordinates of the position of the shooting lens when it starts working and the preset coordinates when the shooting lens is coaxial with the incident light path are obtained. The angle that the rotating disk needs to rotate is determined by the starting coordinates and the preset coordinates, and then the rotating disk is controlled to rotate according to the angle by the driving member.

[0080] S3. The control wheel turns to make the reflecting prism coaxial with the incident light path, so that the incident light path is reflected by the reflecting prism to form an outgoing light path, and the outgoing light path is coaxial with the optical fiber, and the outgoing light path is guided into the spectrometer through the optical fiber.

[0081] After the shooting is completed, the turntable needs to be rotated until the reflecting prism is coaxial with the incident light path. Before the rotation, it is necessary to determine the rotation angle required for the turntable to rotate from the shooting position (the position when the shooting lens is coaxial with the incident light path) to the measuring position (the position when the reflecting prism is coaxial with the incident light path), and then control the turntable to rotate according to the rotation angle. Specifically, the preset coordinates determined in step S2 and the coordinates of the position of the reflecting prism when the shooting lens is coaxial with the incident light path are used to determine the rotation angle. When the shooting position and the measuring position are switched later, the rotation angle is used to control the turntable to rotate clockwise / counterclockwise.

[0082] The optical fiber is arranged on the outgoing light path, so that the outgoing light path can directly irradiate the end face of the optical fiber, and guided by the optical fiber, the outgoing light path reaches the spectrometer for analysis.

[0083] S4. Control the spectrometer to measure the color coordinates of the center point of the outgoing light path, and calibrate the first color coordinates based on the color coordinates of the center point.

[0084] Since the reflecting prism is coaxial with the incident light path, and there is an angle between the mirror surface on the reflecting prism and the measuring plate, the light at the center of the incident light path can be transmitted to the spectrometer through the reflecting prism, so that the spectrometer measures the color coordinates of the light, which are the color coordinates of the center point of the incident light path;

[0085] Based on the center point color coordinates measured by the spectrometer, the difference is compared with the center point color coordinates in the first color coordinates measured by the colorimeter body, and the color coordinates of other positions in the first color coordinates are calibrated by the difference, thereby improving the measurement accuracy.

[0086] S5. The control wheel turns to rotate to cyclically execute steps S2, S3 and S4.

[0087] In this step, steps S2, S3, and S4 are executed in a loop until the product to be tested is completely measured.

[0088] In this embodiment, the reflective prism is arranged on the measuring board through the position of the conducting component. The reflective prism is located on the side of the measuring board close to the photographing lens, and the center of the measuring board is not on this side. The distance from the geometric center of the reflective prism to the rotation center is kept equal to the distance from the rotation center to the center of the photographing lens. When the rotary disk is in the photographing position, the reflective prism can reflect the incident light path to the optical fiber. During measurement, the camera in the main body of the colorimeter is first used to photograph at the photographing position (the photographing lens is coaxial with the incident light path), and the color coordinates of the photographed image are measured by the built-in analysis and processing module. Then, the rotary disk is rotated to switch to the reflective prism to be coaxial with the incident light path. At this time, the incident light path is reflected by the reflective prism to form an outgoing light path that is guided to the optical fiber, and then guided to the spectrometer by the optical fiber. The color coordinates of the center point are measured by the spectrometer, and the color coordinates measured by the main body of the colorimeter are corrected by the color coordinates of the center point. Then, the switching between the photographing position and the measuring position is cyclically performed to make the photographing lens and the reflective prism cyclically coaxial with the incident light axis, so as to achieve cyclic measurement and correction. Therefore, by arranging the reflecting prism on the side of the measuring plate close to the photographing lens, the rotation angle of the rotating disk when switching the measurement can be reduced, thereby reducing the switching time, reducing the switching cycle, and improving the measurement efficiency.

[0089] For the positioning of the reflector prism on the measuring plate, please continue to refer to Figure 8 , when arranging the positions of the optical fiber and the reflecting prism, perform the following steps:

[0090] 301. A virtual optical axis circle is made with the distance from the center of the shooting lens to the rotation center of the rotating disk as the radius and the rotation center as the center.

[0091] Virtual optical axis circle Figure 1 As shown, in Figure 1 In the figure, the center of the shooting lens, the center of the measuring plate and the centers of the two neutral density filters with different transmittances are also located on the virtual optical axis circle. The position of the reflecting prism must be on the virtual optical axis circle, thereby ensuring that when the turntable rotates to the measuring position, the reflecting prism can be aligned with the axis of the incident light path (coaxial with the incident light path).

[0092] 302. Determine an arc where the virtual optical axis circle intersects the measuring plate, divide the arc by the center of the measuring plate, determine a target arc close to the side of the shooting lens, and the center of the measuring plate is not on the target arc.

[0093] The part of the virtual optical axis circle within the measuring plate area is called an arc. The arc is divided into left and right sides using the straight line between the center of the measuring plate and the rotation center as the dividing line. The left side is the target arc close to the shooting lens. The center of the measuring plate is removed from the target arc. Any position on the target arc can be aligned with the axis of the incident light path.

[0094] 303. Determine the installation point of the reflecting prism on the target arc. The installation point coincides with the geometric center of the reflecting prism. At the installation point, the reflecting prism contacts the inner edge of the measuring plate.

[0095] Since any position on the target arc can be aligned with the axis of the incident light path, a mounting point can be determined on the target arc, and the reflective prism is mounted on the mounting point, which can ensure that the reflective prism is coaxial with the incident light path, and compared with the prior art, the position of the reflective prism is closer to the shooting lens;

[0096] Due to the irregular shape of the reflecting prism, in this embodiment, the geometric center of the reflecting prism is determined according to the volume of the reflecting prism. When installing the reflecting prism, the geometric center of the reflecting prism needs to coincide with the installation point.

[0097] When determining the installation point, it is also necessary to consider that the edge of the reflecting prism contacts the inner edge of the measuring plate, but the reflecting prism does not exceed the range of the measuring plate.

[0098] Therefore, under the premise of ensuring that the reflecting prism is coaxial with the incident light path, the installation point closest to the shooting lens can be determined on the measuring board, and the reflecting prism can be installed on this installation point. Compared with the prior art of installing it at the center of the measuring board, the distance between the reflecting prism and the shooting lens can be greatly shortened. Therefore, during the rotation of the turntable, the rotation angle can be shortened, thereby improving efficiency.

[0099] Based on the mounting point and the center of the shooting lens, the angle between the mounting point and the center of the shooting lens (the angle on the turntable) can be calculated, and the rotation of the turntable is controlled according to the angle to ensure that after each switch, the shooting lens is coaxial with the incident light path, or the reflecting prism is coaxial with the incident light path.

[0100] 304. Based on the arrangement direction of the optical fiber, adjust the reflection direction of the reflection prism so that the reflection direction is coaxial with the arrangement direction.

[0101] After determining the installation point of the reflective prism in the measuring board, it is necessary to further determine the emission direction of the reflective prism to ensure that the reflective prism can accurately reflect the incident light path to the optical fiber; in this step, when the reflective prism is coaxial with the incident light path, the reflection direction of the reflective prism needs to be coaxial / coincident with the arrangement direction of the optical fiber. The reflection direction can be adjusted by adjusting the turntable at the bottom of the reflective prism.

[0102] By determining the installation point and reflection direction of the reflection prism, when arranging the reflection prism on the measuring plate of other colorimeter bodies, there is no need to reposition it, so that the reflection prism can be quickly arranged and the assembly efficiency is improved.

[0103] 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 spectrally corrected imaging colorimeter, characterized in that: include: Colorimeter body, wheel disc and transmission components; The rotating disk and the conducting assembly are respectively arranged on the colorimeter body, the rotating disk is connected to a driving member on the colorimeter body through a connecting member, and the driving member is used to control the rotation of the rotating disk through the connecting member; The rotating disk is provided with adjacent photographing lenses and measuring plates, the photographing lenses are used to connect the colorimeter body with the incident light path, the measuring plate is divided into a first part and a second part, the measuring plate is circular and the center of the measuring plate is located in the second part, the first part is the part close to the photographing lenses, a reflecting prism is provided in the first part, and the distance from the geometric center of the reflecting prism to the rotation center is equal to the distance from the center of the photographing lens to the rotation center, and there is an angle between the mirror surface on the reflecting prism and the measuring plate; The rotating disk has a shooting position and a measuring position. In the shooting position, the shooting lens is coaxial with the incident light path. In the measuring position, the rotating disk is controlled to rotate so that the reflecting prism is coaxial with the incident light path, and the reflecting direction of the reflecting prism is coaxial with the arrangement direction of the transmitting component, and the transmitting component is used to connect with the spectrometer.

2. The spectrally corrected imaging colorimeter according to claim 1, characterized in that: The reflecting prism is in contact with an edge of the measuring plate.

3. The spectrally corrected imaging colorimeter according to claim 1 or 2, characterized in that: The included angle between the mirror surface and the measuring plate is 45 degrees.

4. The spectrally corrected imaging colorimeter according to claim 1 or 2, characterized in that: A turntable is disposed at the bottom of the reflection prism, the reflection prism is fixed to the measuring plate via the turntable, and the reflection prism is controlled to rotate on the turntable.

5. The spectrally corrected imaging colorimeter according to claim 1, characterized in that: Two adjacent dimming filters are also arranged on the rotating disk, and the two dimming filters, the shooting lens and the measuring plate are located on the same plane.

6. The spectrally corrected imaging colorimeter according to claim 1 or 2, characterized in that: On the rotating disk, a line connecting the rotation center to the center of the circle of the photographing lens is perpendicular to a line connecting the rotation center to the center of the circle of the measuring plate.

7. The spectrally corrected imaging colorimeter according to claim 1, wherein: The transmission component includes a support seat and an optical fiber. The support seat is connected to the colorimeter body. The first end of the optical fiber is fixed on the support seat, and the second end of the optical fiber is used to connect to the spectrometer.

8. The spectrally corrected imaging colorimeter according to claim 7, characterized in that: The support seat comprises a base and a rotating fixed seat. A track is arranged on the main body of the colorimeter. The base is movably connected to the track. The rotating fixed seat is fixed to the base. The rotating fixed seat is controllably rotatable.

9. A color coordinate measurement method, applied to the spectrally corrected imaging colorimeter according to any one of claims 1 to 8, characterized in that: include: S1. Based on the arrangement direction of the optical fiber on the colorimeter body, a reflecting prism is arranged between the center of the measuring plate and the photographing lens, and the reflecting direction of the reflecting prism is adjusted so that the reflecting direction is coaxial with the arrangement direction; S2. The control wheel is rotated so that the photographing lens is coaxial with the incident light path, the incident light path is photographed through the colorimeter body, and the first color coordinates of the photographed image are measured; S3. Control the rotation of the rotary disk so that the reflecting prism is coaxial with the incident light path, so that the incident light path is reflected by the reflecting prism to form an outgoing light path, the outgoing light path is coaxial with the optical fiber, and the outgoing light path is guided into the spectrometer through the optical fiber; S4. Control the spectrometer to measure the color coordinates of the center point of the outgoing light path, and calibrate the first color coordinates based on the color coordinates of the center point; S5. The control wheel turns to rotate to cyclically execute steps S2, S3 and S4.

10. The color coordinate measurement method according to claim 9, characterized in that: The step of arranging a reflecting prism between the center of the measuring plate and the photographing lens and adjusting the reflecting direction of the reflecting prism so that the reflecting direction is coaxial with the arranging direction comprises: A virtual optical axis circle is made with the distance from the center of the shooting lens to the rotation center of the rotating disk as the radius and the rotation center as the center; Determine the arc where the virtual optical axis circle intersects the measuring plate, divide it by the center of the measuring plate, determine the target arc close to the side of the shooting lens, and the center of the measuring plate is not on the target arc; Determining a mounting point of the reflective prism on the target arc, wherein the mounting point coincides with a geometric center of the reflective prism, and at the mounting point, the reflective prism contacts an inner edge of the measuring plate; Based on the arrangement direction of the optical fiber, the reflection direction of the reflection prism is adjusted so that the reflection direction is coaxial with the arrangement direction.

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