Spectrocalibration imaging colorimeter and color coordinate measurement method

Abstract

The application discloses a spectral calibration formal imaging colorimeter and a color coordinate measurement method, which is used for reducing the rotation angle of a rotating disc when measuring color coordinates. The application comprises a colorimeter main body, a rotating disc and a conduction assembly; the rotating disc and the conduction assembly are arranged on the colorimeter main body; the rotating disc is provided with adjacent shooting lenses and a measurement plate; the measurement plate is divided into a first part and a second part; the measurement plate is circular and the center of the measurement plate is in the second part; a reflecting prism is arranged in the first part; the distance from the geometric center of the reflecting prism to the rotation center is equal to the distance from the center of the shooting lens to the rotation center; the rotating disc has a shooting position and a measurement position; at the shooting position, the shooting lens is coaxial with an incident light path; at the measurement position, the rotating disc 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 conduction assembly; and the conduction assembly is used for being connected with a spectrometer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of brightness chrominance detection, in particular to a spectral formal imaging colorimeter and a color coordinate measurement method. BACKGROUND

[0002] The spectral formal imaging colorimeter is a high-precision measurement device, which shoots the whole to-be-measured object into a picture by a color camera, and then extracts the RGB components of each pixel, converts the extracted RGB components into color coordinates (XYZ) by using a specific software algorithm, so as to realize accurate measurement of the color of the object.

[0003] The existing spectral formal imaging colorimeter is provided with a shooting position and a measurement position, a reflector (plane or prism) is arranged at the center of the measurement position, the picture of the to-be-measured object is shot at the shooting position, and then the measurement position is adjusted, the incident light is reflected to the optical fiber through the reflector in the measurement position, and the incident light at the center of the picture is guided into the spectrometer through the optical fiber, the light is decomposed by the spectrometer 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 fed back to correct the picture color coordinates obtained by the whole camera shooting and calculation, and then the shooting position and the measurement position are switched to measure.

[0004] However, in the process of repeatedly switching the measurement, the angle between the shooting position and the measurement position is large, and a long switching time is required when repeatedly rotating and switching, so that the overall beat time is long and the measurement efficiency is low. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a spectral formal imaging colorimeter and a color coordinate measurement method, which can reduce the rotation angle of the rotating disc when measuring the color coordinates and reduce the beat time between shooting and measurement.

[0006] The first aspect of the present application provides a spectral formal imaging colorimeter, which comprises:

[0007] a colorimeter main body, a rotating disc and a conducting assembly;

[0008] The rotating disc and the conducting assembly are arranged on the colorimeter main body, the rotating disc is connected with a driving member on the colorimeter main body through a connecting member, and the driving member is used to control the rotation of the rotating disc through the connecting member.

[0009] The wheel disc is provided with an adjacent shooting lens and a measuring plate, the shooting lens is used for connecting the colorimeter main 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 in the second part, the first part is close to the shooting lens, the first part is provided with a reflecting prism, 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 shooting lens to the rotation center, there is an included angle between the mirror surface on the reflecting prism and the measuring plate.

[0010] The wheel disc 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 wheel disc is controlled to rotate to make the reflecting prism coaxial with the incident light path, and the reflecting direction of the reflecting prism is coaxial with the arrangement direction of the conducting assembly, and the conducting assembly is used for connecting with a spectrometer.

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

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

[0013] Optionally, the bottom of the reflecting prism is provided with a rotating disc, the reflecting prism is fixed on the measuring plate through the rotating disc, and the reflecting prism is controlled to rotate on the rotating disc.

[0014] Optionally, the wheel disc is further provided with two adjacent light reduction mirrors, and the two light reduction mirrors are in the same plane with the shooting lens and the measuring plate.

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

[0016] Optionally, the conducting assembly comprises a supporting seat and an optical fiber, the supporting seat is connected with the colorimeter main body, the first end of the optical fiber is fixed on the supporting seat, and the second end of the optical fiber is used for connecting with the spectrometer.

[0017] Optionally, the supporting seat comprises a base and a rotating fixing seat, the colorimeter main body is provided with a track, the base is movably connected on the track, the rotating fixing seat is fixed on the base, and the rotating fixing seat is controlled to rotate.

[0018] The second aspect of the present application provides a color coordinate measurement method, applied to the above-mentioned first aspect and any optional colorimetric spectrometer of 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 imaging lens, and the reflection direction of the reflecting prism is adjusted so that the reflection direction is coaxial with the arrangement direction;

[0020] S2. Control the rotary table to rotate so that the imaging lens is coaxial with the incident light path, and take a picture of the incident light path through the colorimeter body to measure the first color coordinates of the captured image;

[0021] S3. Control the rotation of the rotary disk 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, 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 center point color coordinates of the outgoing light path, and calibrate the first color coordinates based on the center point color coordinates;

[0023] S5. Control the rotation of the turntable to cyclically execute steps S2, S3 and S4.

[0024] Optionally, the step of arranging a reflecting prism between the center of the measuring plate and the imaging lens, and adjusting the reflection direction of the reflecting prism so that the reflection direction is coaxial with the arrangement direction, includes:

[0025] A virtual optical axis circle is drawn with the distance from the center of the imaging lens to the rotation center of the rotary 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, and divide the circle using the center of the measuring plate to determine the target arc closer to the imaging lens, wherein the center of the measuring plate is not on the target arc;

[0027] A mounting point for the reflecting prism is determined on the target arc, the mounting point coinciding with the geometric center of the reflecting prism, and at the mounting point, the reflecting prism contacts the inner edge of the measuring plate;

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

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

[0030] The application sets a shooting lens and a measuring plate on a rotating disc, the measuring plate is divided into a first part and a second part, a reflecting prism is arranged in the first part, the first part is close to the shooting lens, the center of the measuring plate is in the second part, the distance from the geometric center of the reflecting prism to the rotation center is equal to the distance from the center of the shooting lens to the rotation center, and there is an included angle between the mirror surface on the reflecting prism and the measuring plate; the rotating disc has a shooting position and a measuring position, at the shooting position, the shooting lens is coaxial with the incident light path, at the measuring position, the rotating disc is controlled to rotate to make the reflecting prism coaxial with the incident light path, and the reflecting direction of the reflecting prism is coaxial with the arrangement direction of the transmission assembly, the transmission assembly is used to be connected with a spectrometer, the rotating disc is controlled to rotate to switch back and forth between the measuring position and the shooting position, thereby, compared with the prior art that the reflecting prism is arranged at the center of the measuring plate, the reflecting prism is arranged on the first part close to the shooting lens of the measuring plate, when switching back and forth, the rotation angle between the shooting lens and the measuring plate can be reduced, thereby, the rotation beat can be reduced, and the measurement efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0032] Figure 1 A schematic diagram of a spectral calibration formal imaging colorimeter according to the application;

[0033] Figure 2 Another schematic diagram of a spectral calibration formal imaging colorimeter according to the application;

[0034] Figure 3 Another schematic diagram of a spectral calibration formal imaging colorimeter according to the application;

[0035] Figure 4 Another schematic diagram of a spectral calibration formal imaging colorimeter according to the application;

[0036] Figure 5 A schematic diagram of the cooperation between a support seat and a track in a spectral calibration formal imaging colorimeter according to the application;

[0037] Figure 6 A schematic diagram of a reflecting prism in a spectral calibration formal imaging colorimeter according to the application;

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

[0039] Figure 8 A flowchart of a color coordinate measurement method for positioning a reflection prism is provided in the present application.

[0040] Wherein, the colorimeter body 01, the rotating disc 02, the transmission assembly 03, the belt 04, the reflection prism 05, the lens 06, the support base 07, the optical fiber 08, the track 09, the base 10, the rotating fixing base 11, the rotating disc 12, the pulley 13, the shooting lens 14, the light reduction lens 15, and the measurement plate 16. DETAILED DESCRIPTION

[0041] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal", and the like indicate the orientation or positional relationship shown in the drawings, and are used only to illustrate the relative positional relationship between the components or constituent parts, and do not particularly limit the specific installation orientation of the components or constituent parts.

[0042] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those of ordinary skill in the art can understand the specific meaning of these terms in the present application according to the specific circumstances.

[0043] In addition, the terms "mounting", "setting", "provided with", "connection", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or constituent parts. Those of ordinary skill in the art can understand the specific meaning of the above-mentioned terms in the present application according to the specific circumstances.

[0044] In addition, the structure, proportion, size, etc. shown in the drawings attached in the present application are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and do not have technical substantive significance, and any modification of the structure, change of the proportion relationship, or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0045] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0046] The present application provides a spectral calibration formal imaging colorimeter and a color coordinate measurement method, which are used to reduce the rotation angle of a rotating disc when measuring color coordinates and reduce the beat time between measurements. The specific implementation process of the present application is described as follows.

[0047] Please refer to Figures 1 to 6 The present application provides a spectral calibration formal imaging colorimeter in the first aspect, which comprises:

[0048] The colorimeter main body 01, the rotating disc 02 and the transmission assembly 03 are arranged on the colorimeter main body 01. The rotating disc 02 is connected with the driving part on the colorimeter main body 01 through the connecting part. The driving part is used to control the rotation of the rotating disc 02 through the connecting part. The adjacent shooting lens 14 and the measurement plate 16 are arranged on the rotating disc 02. The shooting lens 14 is used to connect the colorimeter main body 01 with the incident light path. The measurement plate 16 is divided into a first part and a second part. The measurement plate 16 is circular and the center of the measurement plate 16 is located in the second part. The first part is close to the shooting lens 14. The reflecting prism 05 is arranged in the first 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 included angle between the mirror surface on the reflecting prism 05 and the measurement plate 16. The rotating disc 02 has a shooting position and a measurement position. At the shooting position, the shooting lens 14 is coaxial with the incident light path. At the measurement position, the rotating disc 02 is controlled to rotate so that the reflecting prism 05 is coaxial with the incident light path. The reflecting direction of the reflecting prism 05 is coaxial with the arrangement direction of the transmission assembly 03. The transmission assembly 03 is used to be connected with the spectrometer.

[0049] The colorimeter main body 01 is connected with the lens 06. The incident light path is transmitted from the direction of the lens 06. The analysis and processing module is arranged in the colorimeter main body 01. The analysis and processing module can analyze and process the image shot at the shooting position to measure the color coordinates of the shot image. The lens 06 is detachably connected on the colorimeter main body 01 by means of buckle, thread, bolt and the like.

[0050] The driving part is a motor. The connecting part is a belt 04. The pulley 13 is arranged on the motor. The motor can control the rotation of the pulley 13. The pulley 13 and the outer ring of the rotating disc 02 are connected through the belt 04. Therefore, when the pulley 13 rotates, the rotating disc 02 rotates with it. The rotation center of the rotating disc 02 is the center position thereof.

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

[0052] The reflecting prism 05 is arranged on the measuring plate 16, and a straight line determined between the rotating center and the center of the measuring plate 16 is taken as a division line, the measuring plate 16 is divided into two parts by the division line, the part close to the shooting lens 14 is a first part, and the part relatively far away from the shooting lens 14 is a second part, and the center of the measuring plate 16 is in the second part, so that when the geometric center of the reflecting prism 05 is arranged at any position in the first part, the geometric center of the reflecting prism 05 does not coincide with the center of the measuring plate 16, and the edge of the reflecting prism 05 does not exceed the edge of the measuring plate 16.

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

[0054] The reflecting prism 05 is arranged obliquely on the measuring plate 16, that is, there is an included angle between the mirror surface of the reflecting prism 05 and the measuring plate 16, so that when the incident light path irradiates on the mirror surface of the reflecting prism 05, the reflecting prism 05 can reflect the incident light path at another angle.

[0055] The wheel disc 02 has a measuring position and a shooting position, and the wheel disc 02 is controlled to rotate to switch between the measuring position and the shooting position; when switched to the shooting position, the lens 06 is aligned with the shooting lens 14, and the center of the incident light path passing through the lens 06 coincides with the center of the shooting lens 14, at this time, the colorimeter main body 01 can shoot and detect the incident light path through the shooting lens 14.

[0056] When the wheel disc 02 is switched to the measuring position, the reflecting prism 05 is coaxial with the incident light path, that is, the reflecting prism 05 coincides with the optical axis of the incident light path; the incident light path irradiates on the mirror surface of the reflecting prism 05, because there is an included angle between the mirror surface and the measuring plate 16, so the mirror surface reflects the incident light path at another angle, and since the reflection direction of the mirror surface is coaxial with the transmission assembly 03, the reflected light path reaches the spectrometer after being guided by the transmission assembly 03.

[0057] It should be noted that at the measuring position, only the reflection prism 05 is in 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 the embodiment, by arranging the shooting lens 14 and the measuring plate 16 on the rotating disc 02, the first part and the second part are divided on the measuring plate 16, the reflection prism 14 is arranged in the first part, the first part is the part close to the shooting lens 14, the center of the measuring plate 16 is in the area of the second part, the distance from the geometric center of the reflection prism 05 to the rotation center is equal to the distance from the center of the shooting lens 14 to the rotation center, and there is an included angle between the mirror surface on the reflection prism 05 and the measuring plate 16; the rotating disc 02 has a shooting position and a measuring position, at the shooting position, the shooting lens 14 is coaxial with the incident light path, at the measuring position, the rotating disc 02 is controlled to rotate to make the reflection prism 05 coaxial with the incident light path, and the reflection direction of the reflection prism 05 is coaxial with the arrangement direction of the transmission assembly 03, the transmission assembly 03 is used to be connected with the spectrometer, the rotating disc 02 is controlled to rotate to switch back and forth between the measuring position and the shooting position, thereby, compared with the prior art that the reflection prism 05 is arranged at the center of the measuring plate 16, the reflection prism 05 is arranged on the side of the measuring plate 16 close to the shooting lens 14 in the application, and when switching back and forth, the rotation angle between the shooting lens 14 and the measuring plate 16 can be reduced, so that the rotation beat is reduced and the measurement efficiency is improved.

[0059] In an optional embodiment, the reflection prism 05 is in contact with the inner edge of the measuring plate 16, by contacting the reflection prism 05 with the inner edge of the measuring plate 16, it is ensured that the reflection prism 05 is at the position closest to the shooting lens 14 on the measuring plate 16, which is the preferred position in the application, and at this position, the time used for the rotating disc 02 to switch back and forth between the shooting position and the measuring position is the shortest.

[0060] In an optional embodiment, the included angle between the mirror surface on the reflection prism 05 and the measuring plate 16 is 45 degrees, the measuring plate 16 is perpendicular to the incident light path, the included angle between the mirror surface on the reflection 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 transmission assembly 03 is also parallel to the measuring plate 16, and is coaxial with the reflected light path, and the reflected light path irradiates on the transmission assembly 03.

[0061] In an optional embodiment, two adjacent light reduction lenses 15 are further arranged on the rotating disc 02, the two light reduction lenses 15 are on the same plane with the shooting lens 14 and the measuring plate 16, and the light transmittance of the two light reduction lenses 15 is different.

[0062] In this embodiment, the line between the rotation center of the rotating disc 02 and the center of the shooting lens 14 is perpendicular to the line between the rotation center of the rotating disc 02 and the center of the measuring plate 16.

[0063] The size of the shooting lens 14 is equal to the size of the light-reducing lens 15 and the size of the measuring plate 16; two light-reducing lenses 15 are adjacent to each other, one light-reducing lens 15 is adjacent to the shooting lens 14, and the other light-reducing lens 15 is adjacent to the measuring plate 16, thereby ensuring that the shooting lens 14 is adjacent to and close to the measuring plate 16.

[0064] The four circles of the two light-reducing lenses 15, the shooting lens 14, and the measuring plate 16 are on the rotating disc 02, the distance between any two adjacent circles is the same, the angle between any two adjacent circles (the angle between the lines connecting the centers of the two adjacent circles to the rotation center) is also the same, and the angle is 90 degrees.

[0065] The measuring plate 16 is adjacent to one light-reducing lens 15, and the line between the center of the measuring plate 16 and the center of the other light-reducing lens 15 passes through the rotation center.

[0066] The reflecting prism 05 in the measuring plate 16 is closest to the shooting lens 14, and the position of the reflecting prism 05 does not exceed the area where the measuring plate 16 is located, and the distance from the geometric center of the reflecting prism 05 to the rotation center is kept equal to the distance from the center of the shooting lens 14 to the rotation center. In actual work, first, control the rotating disc 02 to be in the shooting position, at this time, the colorimeter main body 01 shoots the incident light path of the lens 06 through the shooting lens 14 by the camera inside it, after shooting, then control the rotating disc 02 to rotate, so that the rotating disc 02 is in the measuring position, at this time, the reflecting prism 05 is coaxial with the incident light path, the reflecting prism 05 reflects the incident light path into the transmission assembly 03, and then guides it to the spectrometer for analysis. Subsequently, the second round of shooting and measurement, the third round, the fourth round, and so on are carried out.

[0067] The light-reducing lens 15 is used to adjust the intensity of the light entering the camera, and the two light-reducing lenses 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 affecting the measurement result caused by the over-brightness of the light, two light-reducing lenses 15 with different transmittances are set, the rotating disc 02 is controlled to rotate so that the required light-reducing lens 15 is coaxial with the incident light path, thereby reducing the brightness of the camera when shooting.

[0068] In an optional embodiment, the conducting assembly 03 comprises a support base 07 connected with the colorimeter main body 01 and an optical fiber 08, a first end of the optical fiber 08 is fixed on the support base 07, and a second end of the optical fiber 08 is used to be connected with a spectrometer. In this embodiment, the support base 07 is used to fix and support the optical fiber 08, so as to ensure the stability and accuracy of the optical fiber 08 during the transmission of the optical signal, and prevent signal interference or loss caused by 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 reflecting prism 05, and the light path irradiates on the end face of the first end.

[0069] In this optional embodiment, the support base 07 comprises a base 10 and a rotating fixing base 11, the colorimeter main body 01 is provided with a track 09, the base 10 is movably connected with the track 09, and the rotating fixing base 11 is fixed on the base 10 and can be controlled to rotate. In this embodiment, the track 09 is arranged on the colorimeter main body 01, the base 10 of the support base 07 can be controlled to move on the track 09, the position of the support base 07 and the optical fiber 08 can be changed through the track 09, the rotating fixing base 11 is arranged on the base 10 and can rotate on the base 10, and the rotating fixing base 11 is used to clamp and fix the optical fiber 08. Through the arrangement of the rotating fixing base 11, the change of the arrangement direction of the optical fiber 08 can be controlled. Therefore, through the arrangement of the track 09 and the rotating fixing base 11, the position and arrangement direction of the optical fiber 08 can be adjusted according to the shape and arrangement requirement of the colorimeter main 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, or the position and arrangement direction of the optical fiber 08 can be adjusted according to the reflection direction.

[0070] In this optional embodiment, in order to adapt to the change of the position and arrangement direction of the optical fiber 08 after the change, the optical fiber 08 is still coaxial with the outgoing light path, so the reflection direction of the reflecting prism 05 is adjusted according to the arrangement direction of the conducting assembly 03. A rotating disc 12 is arranged at the bottom of the reflecting prism 05, the reflecting prism 05 is fixed on the measuring plate 16 through the rotating disc 12, and the reflecting prism 05 is controlled to rotate on the rotating disc 12. The rotating disc 12 is fixed on the measuring plate 16 by means of bolts, screws, buckles or adhesion.

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

[0072] S1. Based on the arrangement direction of the optical fiber on the colorimeter main body, a reflecting prism is arranged between the center of the measuring plate and the shooting lens, and the reflection direction of the reflecting prism is adjusted so as to be coaxial with the arrangement direction.

[0073] In order to reduce the rotation angle of the rotating disc and reduce the rotation beat, the position measuring plate of the reflecting prism is measured, and the geometric center of the reflecting prism is not coincident with the center of the measuring plate, but is located on the side of the measuring plate close to the shooting lens (but not beyond the range of the measuring plate).

[0074] In this step, the reflecting prism reflects the incident light path into the optical fiber, so that the optical fiber is guided into the spectrometer, and 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 reflecting prism is arranged, if the shooting lens is coaxial with the incident light path at the beginning of work, direct shooting is performed, and if it is not coaxial, step S2 is performed.

[0076] S2. Control the rotation of the rotating disc to make the shooting lens coaxial with the incident light path, and shoot the incident light path by the colorimeter main body to measure the first color coordinates of the shot image.

[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 main body shoots the incident light path by the internal camera to measure the color characteristics of the incident light path, specifically by analyzing the different wavelength components in the light to determine the color coordinates.

[0078] The first color coordinates are measured by the analysis and processing module inside the colorimeter main body according to the shot image, and the first color coordinates at least include the color coordinates of the center point of the shot image and the color coordinates of other points on the shot image.

[0079] The rotation of the rotating disc is controlled by the driving member provided in the colorimeter, and when rotating, the starting coordinates of the position of the shooting lens at the beginning of work can be obtained, and the preset coordinates when the shooting lens is coaxial with the incident light path can be obtained, the angle of rotation required by the rotating disc is determined by the starting coordinates and the preset coordinates, and then the rotating disc is rotated by the driving member according to the angle.

[0080] S3. Control the rotation of the rotating disc 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 by the optical fiber.

[0081] After the shooting is completed, the rotating disc needs to be rotated to the position where the reflecting prism is coaxial with the incident light path. Before the rotation, the rotating angle required for the rotating disc to rotate from the shooting position (the position where the shooting lens is coaxial with the incident light path) to the measurement position (the position where the reflecting prism is coaxial with the incident light path) needs to be determined, and then the rotating disc is controlled to rotate according to the rotating angle. Specifically, the rotating angle is determined by 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. The rotating angle is determined by the preset coordinates and the coordinates of the reflecting prism. When the shooting position and the measurement position are switched with each other, the rotating disc is controlled to rotate clockwise or counterclockwise according to the rotating angle.

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

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

[0084] Since the reflecting prism is coaxial with the incident light path, there is an angle between the mirror surface on the reflecting prism and the measurement plate. Therefore, by the reflecting prism, the light ray at the center position of the incident light path can be transmitted to the spectrometer, so that the spectrometer measures the color coordinate of the light ray, which is the color coordinate of the center point of the incident light path.

[0085] The center point color coordinate measured by the spectrometer is compared with the center point color coordinate in the first color coordinate measured by the colorimeter main body to obtain a difference value. The color coordinates of other positions in the first color coordinate are calibrated by the difference value, so as to improve the accuracy of the measurement.

[0086] S5. Control the rotating disc to rotate to cyclically execute steps S2, S3 and S4.

[0087] In this step, steps S2, S3 and S4 are cyclically executed until the to-be-measured product is completely measured.

[0088] In this embodiment, the reflecting prism is positioned on the measuring plate by the location of the transmission component. The reflecting prism is located on the side of the measuring plate closer to the imaging lens, and the center of the measuring plate is not on this side. The distance from the geometric center of the reflecting prism to the rotation center is equal to the distance from the rotation center to the center of the imaging lens. When the rotary table is in the shooting position, the reflecting prism can reflect the incident light path onto the optical fiber. During measurement, the camera inside the colorimeter body first takes a picture at the shooting position (the imaging lens and the incident light path are coaxial), and the color coordinates of the captured image are measured by the built-in analysis and processing module. Then, by rotating the rotary table, the colorimeter body switches to the position where the reflecting prism and the incident light path are coaxial. At this time, the incident light path is reflected by the reflecting prism to form an outgoing light path, which is guided into the optical fiber and then into the spectrometer. The color coordinates of the center point are measured by the spectrometer, and the color coordinates measured by the colorimeter body are corrected by the color coordinates of the center point. Then, the switching between the shooting position and the measurement position is performed cyclically, so that the imaging lens and the reflecting prism are cyclically coaxial with the incident light axis, realizing cyclic measurement and correction. Therefore, by placing the reflecting prism on the side of the measuring plate closer to the imaging lens, the rotation angle of the rotary table during measurement switching can be reduced, thereby reducing switching time, reducing switching cycle time, and improving measurement efficiency.

[0089] For instructions on positioning the reflecting prism on the measuring plate, please refer to [link / reference needed]. Figure 8 When arranging the positions of the optical fiber and the reflecting prism, the following steps are performed:

[0090] 301. Draw a virtual optical axis circle with the distance from the center of the shooting lens to the rotation center of the rotary disk as the radius and the rotation center as the center.

[0091] Virtual optical axis circle Figure 1 As shown, in Figure 1 In this process, the center of the imaging 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, so that when the rotary table 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 the arc where the virtual optical axis circle intersects the measuring plate, and divide the circle using the center of the measuring plate to determine the target arc on the side closer to the imaging lens, ensuring that the center of the measuring plate is not on the target arc.

[0093] The portion of the virtual optical axis circle within the measurement plate area is called an arc. Using the straight line between the center of the measurement plate and the rotation center as a line, this arc is divided into left and right sides. The left side is the target arc closer to the imaging lens. The center of the measurement 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、determining a mounting point of the reflecting prism on the target arc, the mounting point coinciding with the geometric center of the reflecting prism, at the mounting point, the reflecting prism is in contact with the inner edge of the measuring plate.

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

[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, and the geometric center of the reflecting prism needs to coincide with the mounting point when the reflecting prism is mounted.

[0097] The determination of the mounting point also needs to consider that the edge of the reflecting prism is in contact with the inner edge of the measuring plate, but the reflecting prism does not exceed the range of the measuring plate.

[0098] Therefore, the mounting point closest to the shooting lens can be determined on the measuring plate under the premise of ensuring that the reflecting prism is coaxial with the incident light path, and the reflecting prism is mounted at the mounting point, which can greatly shorten the distance between the reflecting prism and the shooting lens compared to the prior art of mounting at the center of the measuring plate, and thus the rotation angle during the rotation of the rotating disc can be shortened, thereby improving the 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 rotating disc) can be calculated, and the rotating disc is controlled according to the angle to ensure that the shooting lens is coaxial with the incident light path or the reflecting prism is coaxial with the incident light path after each switching.

[0100] 304、adjusting the reflection direction of the reflecting prism based on the arrangement direction of the optical fiber, so that the reflection direction is coaxial with the arrangement direction.

[0101] After determining the mounting point of the reflecting prism in the measuring plate, the reflection direction of the reflecting prism needs to be further determined to ensure that the reflecting prism can accurately reflect the incident light path to the optical fiber; in this step, when the reflecting prism is coaxial with the incident light path, the reflection direction of the reflecting prism needs to be coaxial / coincide with the arrangement direction of the optical fiber. The adjustment of the reflection direction can be realized by adjusting the rotating disc at the bottom of the reflecting prism.

[0102] By determining the mounting point and the reflection direction of the reflecting prism, the reflecting prism can be quickly arranged on the measuring plate of other colorimetry main bodies without repositioning, thereby improving the assembly efficiency.

[0103] It is to be understood that the embodiments that have been described above are merely illustrative and that changes and modifications can be made to those embodiments without departing from the scope of the application. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of these embodiments.

Claims

1. A spectrally calibrated imaging colorimeter, characterized in that, include: Colorimeter body, rotary table and transmission components; The rotary disk and the transmission component are respectively disposed on the colorimeter body. The rotary disk is connected to the driving component on the colorimeter body through a connector. The driving component is used to control the rotation of the rotary disk through the connector. The rotary disk is provided with adjacent imaging lenses and measuring plates. The imaging lenses are used to connect the colorimeter body to the incident light path. The measuring plate is divided into a first part and a second part. The measuring plate is circular and its center is located in the second part. The first part is the part close to the imaging lens. A reflecting prism is provided in the first part. The distance from the geometric center of the reflecting prism to the rotation center is equal to the distance from the center of the imaging lens to the rotation center. There is an angle between the mirror surface on the reflecting prism and the measuring plate. The rotary disk has a shooting position and a measurement position. In the shooting position, the shooting lens is coaxial with the incident light path. In the measurement position, the rotary disk is rotated in a controlled manner so that the reflecting prism is coaxial with the incident light path, and the reflection direction of the reflecting prism is coaxial with the arrangement direction of the transmission component. The transmission component is used to connect to the spectrometer. The reflecting prism is in contact with the edge of the measuring plate.

2. The spectrally calibrated imaging colorimeter according to claim 1, characterized in that, The angle between the mirror and the measuring plate is 45 degrees.

3. The spectrally calibrated imaging colorimeter according to claim 1, characterized in that, The bottom of the reflecting prism is provided with a turntable, and the reflecting prism is fixed on the measuring plate by the turntable. The reflecting prism is controlled to rotate on the turntable.

4. The spectrally calibrated imaging colorimeter according to claim 1, characterized in that, The rotary table is also provided with two adjacent neutral density (ND) mirrors, which are on the same plane as the imaging lens and the measuring plate.

5. The spectrally calibrated imaging colorimeter according to claim 1, characterized in that, On the rotary table, the line connecting the center of rotation to the center of the imaging lens is perpendicular to the line connecting the center of rotation to the center of the measuring plate.

6. The spectrally calibrated imaging colorimeter according to claim 1, characterized in that, 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 the spectrometer.

7. The spectrally calibrated imaging colorimeter according to claim 6, characterized in that, The support base includes a base and a rotating fixed base. The colorimeter body is provided with a track, the base is movably connected to the track, and the rotating fixed base is fixed to the base. The rotating fixed base is controllable and rotatable.

8. A method for measuring color coordinates, applied to a spectrally calibrated imaging colorimeter according to any one of claims 1 to 7, 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 imaging lens. The reflecting prism is located in the first part of the measuring plate near the imaging lens. The reflection direction of the reflecting prism is adjusted so that the reflection direction is coaxial with the arrangement direction. S2. Control the rotary table to rotate so that the imaging lens is coaxial with the incident light path, and take a picture of the incident light path through the colorimeter body to measure the first color coordinates of the captured image; S3. Control the rotation of the rotary disk 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, 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 center point color coordinates of the outgoing light path, and calibrate the first color coordinates based on the center point color coordinates; S5. Control the rotation of the turntable to cyclically execute steps S2, S3 and S4.

9. The color coordinate measurement method according to claim 8, characterized in that, The step of arranging a reflecting prism between the center of the measuring plate and the imaging lens, and adjusting the reflection direction of the reflecting prism so that the reflection direction is coaxial with the arrangement direction, includes: A virtual optical axis circle is drawn with the distance from the center of the imaging lens to the rotation center of the rotary disk as the radius and the rotation center as the center. Determine the arc where the virtual optical axis circle intersects the measuring plate, and divide the circle using the center of the measuring plate to determine the target arc closer to the imaging lens, provided that the center of the measuring plate is not on the target arc; A mounting point for the reflecting prism is determined on the target arc, the mounting point coinciding with the geometric center of the reflecting prism, and at the mounting point, the reflecting prism contacts the inner edge of the measuring plate; Based on the arrangement direction of the optical fiber, the reflection direction of the reflecting prism is adjusted so that the reflection direction is coaxial with the arrangement direction.

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