Image acquisition device and filter type imaging brightness and chrominance meter

Abstract

The utility model provides an image acquisition device and a filter type imaging brightness and chrominance meter. The image acquisition device comprises an imaging sensor, a filter disc and an extinction sheet. And the imaging sensor is used for sensing light rays of lamp points of the display panel and generating a lamp point image. And the filter disc and the imaging sensor are arranged at an interval, and the filter disc is used for filtering light of the lamp points. And the extinction sheet is arranged on a light path from the filter disc to the imaging sensor and is used for eliminating at least part of light transmitted between the filter disc and the imaging sensor. By adding the extinction sheet between the imaging sensor and the filter disc, at least part of light transmitted between the filter disc and the imaging sensor is eliminated, and unnecessary reflected light cannot reach the surface of the imaging sensor for imaging, so that interference of stray light and ghost hot spots is eliminated, the imaging quality is improved, and the measurement precision is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to an image acquisition device and a filter-type imaging luminance and colorimeter. Background Technology

[0002] In the field of filter-type imaging luminance and chromaticity measurement instruments, there are two main factors affecting the accuracy of luminance and chromaticity measurement: the first is the deviation between the XYZ filter transmittance curve and the CIE1931 standard curve, the smaller the deviation, the higher the measurement accuracy; the second is the imaging quality of the optical system, the higher the imaging quality, the higher the accuracy.

[0003] Regarding the second point, due to the placement of the XYZ filter in the optical system, severe stray light and ghosting will be generated during imaging, affecting image quality and the accuracy of luminance and chromaticity measurement. Utility Model Content

[0004] The main technical problem addressed by this application is to provide an image acquisition device and a filter-type imaging luminance and colorimeter, thereby solving the problem of poor imaging quality caused by XYZ filters in existing filter-type imaging luminance and colorimeter measurements.

[0005] To address the aforementioned technical problems, the first technical solution provided in this application is: to provide an image acquisition device, comprising:

[0006] An imaging sensor is used to sense the light from the LEDs on the display panel and generate an image of the LEDs.

[0007] The filter, spaced apart from the imaging sensor, is used to filter the light from the lamp point;

[0008] An extinction plate is placed in the optical path from the filter to the imaging sensor to eliminate at least a portion of the light transmitted between the filter and the imaging sensor.

[0009] Among them, the extinction plate includes the circular polarizer.

[0010] The circular polarizer includes a linear polarizer and a quarter-wave plate, with the linear polarizer positioned on the optical path from the filter to the quarter-wave plate.

[0011] Among them, matte filters include neutral density filters.

[0012] The extinction plate includes a circular polarizer and a neutral density filter, which are disposed at different apertures on the same rotating wheel. The rotating wheel is configured such that one of the apertures can be positioned in the optical path from the filter to the imaging sensor by rotation.

[0013] The rotating wheel includes at least four holes, one of which is equipped with a circular polarizer, one of which is empty, and the remaining holes are equipped with a neutral density filter, with different neutral density filters having different light reduction levels.

[0014] The image acquisition device also includes:

[0015] Sensors are used to sense the light intensity of the LEDs on the display panel.

[0016] The drive mechanism, connected to the rotating wheel, is used to drive the rotating wheel to rotate;

[0017] The drive mechanism is used to drive the rotating wheel to rotate according to the different light intensities of the light points sensed by the sensor, so that the corresponding aperture is set in the optical path from the filter to the imaging sensor.

[0018] The filters include X filters, Y filters and Z filters, and the imaging sensor includes CMOS devices.

[0019] The image acquisition device also includes a lens, which is positioned on the side of the filter away from the extinction filter.

[0020] To address the aforementioned technical problems, the second technical solution provided in this application is: a filter-type imaging luminance and colorimeter, comprising:

[0021] The image acquisition device is the image acquisition device described above;

[0022] An image processor is used to receive and process light spot images from an image acquisition device.

[0023] The beneficial effects of this application: Unlike existing technologies, this application provides an image acquisition device and a filter-type imaging luminance and colorimeter. The image acquisition device includes an imaging sensor, a filter, and an extinction plate. The imaging sensor is used to sense the light from the lamps on the display panel and generate an image of the lamps. The filter, spaced apart from the imaging sensor, is used to filter the light from the lamps. The extinction plate is disposed in the optical path from the filter to the imaging sensor to eliminate at least part of the light transmitted between the filter and the imaging sensor. Due to the high reflectivity of the filter, light will reflect multiple times between the filter and the imaging sensor during imaging, forming abnormal ghosting bright spots, which interferes with the imaging. This application eliminates at least part of the light transmitted between the filter and the imaging sensor by adding an extinction plate between the imaging sensor and the filter, preventing unnecessary reflected light from reaching the surface of the imaging sensor for imaging, thereby eliminating stray light and ghosting bright spot interference, improving image quality, and thus improving measurement accuracy. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0025] Figure 1 This is a schematic diagram of an embodiment of the image acquisition device provided in this application.

[0026] Figure 2 This is a schematic diagram illustrating the working principle of the circular polarizer provided in this application;

[0027] Figure 3 This is a schematic diagram of an embodiment of the matting sheet and rotating wheel provided in this application;

[0028] Figure 4 This is a schematic diagram of another embodiment of the matting sheet and the rotating wheel provided in this application;

[0029] Figure 5 This is a schematic diagram of the module structure of an embodiment of the sensor, drive mechanism, and wheel provided in this application;

[0030] Figure 6 This is a schematic diagram of the structure of an embodiment of the filter-type imaging luminance and colorimeter provided in this application.

[0031] Explanation of icon numbers:

[0032] 100. Image acquisition device; 10. Imaging sensor; 20. Filter; 30. Extinction filter; 31. Circular polarizer; 311. Linear polarizer; 312. Quarter-wave plate; 32. Neutral density filter; 40. Sensor; 50. Drive mechanism; 51. Control circuit; 52. Motor; 60. Rotating wheel; 61. Aperture; 70. Lens; d1. First spacing; d2. Second spacing; 200. Image processor; 300. Filter-type imaging luminance and colorimeter. Detailed Implementation

[0033] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0034] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] Because the XYZ filter is located between the lens and the CMOS (Complementary Metal Oxide Semiconductor) in the optical system and is a reflective design, it will produce severe stray light and ghosting during imaging, affecting image quality and thus affecting the accuracy of luminance and chromaticity measurement.

[0039] In related technologies, the use of algorithmic compensation to repair abnormal areas during the imaging process has the following drawbacks:

[0040] (1) Computational resource requirements: Algorithm compensation may require a lot of computing resources, especially for complex algorithms or when processing large amounts of data, which may lead to the need for more expensive hardware or a reduction in the overall performance of the system.

[0041] (2) Delay: Algorithm compensation usually involves data processing, which may introduce a certain delay, especially in real-time systems, where such delay may be unacceptable.

[0042] (3) Complexity: Developing effective compensation algorithms can be very complex, requiring in-depth expertise and experience. In addition, the complexity of the algorithm may lead to difficulties in maintenance and understanding.

[0043] (4) Model limitations: Algorithm compensation relies on an accurate mathematical model. If the model cannot reflect the actual situation well, or if factors that the model did not consider occur in actual application, the compensation effect may be greatly reduced.

[0044] (5) Adaptability limitations: Although algorithm compensation is flexible, some algorithms may not be able to adapt to all possible situations or environmental changes, especially under extreme conditions.

[0045] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of an embodiment of the image acquisition device provided in this application. Figure 2 This is a schematic diagram illustrating the working principle of the circular polarizer provided in this application.

[0046] To address the aforementioned technical problems, this application provides an image acquisition device 100. The image acquisition device 100 includes an imaging sensor 10, a filter 20, and an extinction plate 30. The imaging sensor 10 is used to sense the light from light spots (not shown) on a display panel (not shown) and generate an image of the light spots. The filter 20 is disposed at a distance from the imaging sensor 10 and is used to filter the light from the light spots. The extinction plate 30 is disposed in the optical path from the filter 20 to the imaging sensor 10 and is used to eliminate at least a portion of the light transmitted between the filter 20 and the imaging sensor 10.

[0047] It is understood that the imaging sensor 10 can be an imaging sensor of a camera (not shown). In one embodiment, the image acquisition device 100 includes a camera and accessories. The camera includes an imaging sensor 10 and a window protective sheet (not shown) located between the imaging sensor 10 and the matte filter 30. The filter 20 and the matte filter 30 are disposed as accessories outside the window protective sheet of the camera. In another embodiment, the sensor 10, filter 20, and matte filter 30 are all integrated into the same camera, for example, the camera's window protective sheet is disposed on the side of the filter 20 away from the matte filter 30.

[0048] Due to the high reflectivity of the filter 20, light will reflect multiple times between the filter 20 and the imaging sensor 10 during imaging, forming abnormal ghosting bright spots that interfere with the imaging process. This application addresses this by adding an extinction plate 30 between the imaging sensor 10 and the filter 20. This eliminates at least a portion of the light transmitted between the filter 20 and the imaging sensor 10, preventing unnecessary reflected light from reaching the surface of the imaging sensor 10 for imaging. This eliminates stray light and ghosting bright spot interference, improves imaging quality, and ultimately enhances measurement accuracy.

[0049] In the optical path from filter 20 to imaging sensor 10, the distance between filter 20 and extinction plate 30 is the first distance d1, and the distance between filter 20 and imaging sensor 10 is the second distance d2. The second distance d2 is greater than the first distance d1.

[0050] In some embodiments, the second spacing d2 is 20-40 mm to ensure that light can be correctly imaged on the imaging sensor 10. The first spacing d1 is 5-20 mm to avoid interference between the filter 20 and the extinction plate 30.

[0051] Specifically, the second spacing d2 is 24.58 mm and the first spacing d1 is 6.88 mm, to ensure that light can be correctly imaged on the sensor and to reduce the size of the image acquisition device 100.

[0052] In some embodiments, the matting filter 30 includes a circular polarizer 31.

[0053] The light transmitted between the filter 20 and the imaging sensor 10 is filtered out by the circular polarizer 31 to remove polarized light in a specific direction, which can effectively reduce unnecessary reflected light and ensure that the light entering the imaging sensor 10 is of higher quality, thereby improving measurement accuracy.

[0054] In some embodiments, the circular polarizer 31 includes a linear polarizer 311 and a quarter-wave plate 312, with the linear polarizer 311 disposed in the optical path from the filter 20 to the quarter-wave plate 312.

[0055] The light transmitted from filter 20 to imaging sensor 10 becomes incident linearly polarized light after passing through linear polarizer 311. The vibration direction of the incident linearly polarized light is parallel to the optical axis of linear polarizer 311. After passing through quarter-wave plate 312, it becomes right-handed circularly polarized light. After being reflected by the surface of imaging sensor 10, it becomes left-handed circularly polarized light. The left-handed circularly polarized light passes through quarter-wave plate 312 again and becomes reflected linearly polarized light perpendicular to the vibration direction of the incident linearly polarized light. Since the vibration direction of this reflected linearly polarized light is perpendicular to the optical axis of linear polarizer 311, it cannot pass through and is completely absorbed, thus achieving the purpose of eliminating ghosting.

[0056] In some embodiments, the matting filter 30 includes a neutral density filter 32 (see Figure 3 and Figure 4 ).

[0057] Neutral Density Filter (ND Filter) is a type of optical filter that uses a light source to filter light.

[0058] The main function of an ND filter is to uniformly reduce the intensity of light across all wavelengths without significantly altering the color or wavelength distribution of the light (i.e., maintaining "neutrality").

[0059] A neutral density filter 32 is disposed between the filter 20 and the imaging sensor 10. Utilizing its ability to uniformly reduce the intensity of light across all wavelengths, it eliminates the intensity of light transmitted between the filter 20 and the imaging sensor 10, thereby improving image quality and measurement accuracy. Specifically, light passes sequentially through the filter 20 and the neutral density filter 32 to reach the surface of the imaging sensor 10 for imaging. Light reflected from the surface of the imaging sensor 10 then passes through the neutral density filter 32 again to reach the surface of the filter 20. The filter 20, being a reflective design, reflects this light, which then passes through the neutral density filter 32 again to reach the surface of the imaging sensor 10, forming ghosting bright spots. Because the light reflected from the imaging sensor 10 passes through the neutral density filter 32 twice, its intensity is attenuated by a factor of 2 (ND value), thus weakening or completely eliminating the ghosting bright spots that reach the imaging sensor 10.

[0060] Please see Figures 1 to 5 , Figure 3 This is a schematic diagram of an embodiment of the matting plate and rotating wheel provided in this application. Figure 4 This is a schematic diagram of another embodiment of the matting plate and the rotating wheel provided in this application. Figure 5 This is a schematic diagram of the module structure of an embodiment of the sensor, drive mechanism, and wheel provided in this application.

[0061] In some embodiments, the extinction filter 30 includes a circular polarizer 31 and a neutral density filter 32, which are disposed on different aperture positions 61 of the same rotating wheel 60. The rotating wheel 60 is configured such that, by rotation, one of the aperture positions 61 can be positioned in the optical path from the filter 20 to the imaging sensor 10.

[0062] The rotating wheel 60 is a rotatable disc-shaped structure that can be mounted on the fixed base of the image acquisition device 100 via bearings or a precision rotating mechanism. The central axis of the rotating wheel 60 is connected to the drive mechanism 50, enabling precise angle control.

[0063] The rotating wheel 60 has at least two holes 61. Multiple optical elements can be integrated on the same rotating wheel 60 to support various functional requirements and reduce the need for additional equipment; secondly, optical elements can be quickly switched by rotating the rotating wheel 60, saving time and cost.

[0064] For example, such as Figure 3 As shown, the rotating wheel 60 has two apertures 61. A circular polarizer 31 is mounted on one aperture 61, and a neutral density filter 32 is mounted on the other aperture 61. The size of the two apertures 61 is not limited and can be selected according to actual needs. The center line connecting the two apertures 61 passes through the central axis of the rotating wheel 60, forming a straight line. That is, the circular polarizer 31 and the neutral density filter 32 are respectively mounted at opposite ends of the diameter of the rotating wheel 60, so that the rotating wheel 60 is subjected to uniform force during rotation, reducing mechanical vibration or imbalance. In addition, it simplifies the design of the drive mechanism 50, as the two optical elements can be switched by precisely controlling the rotation of the rotating wheel 60 by 180°.

[0065] In other embodiments, the wheel 60 has two holes 61, which can also be distributed in other ways.

[0066] For example, the rotating wheel 60 has two or more holes 61. In addition to mounting the circular polarizer 31 and the neutral density filter 32, the holes 61 of the rotating wheel 60 can also mount other optical components, such as phase retardation films, antireflective films, anti-reflection films, special function filters, etc., to improve the flexibility and adaptability of the image acquisition device 100 and meet diverse needs.

[0067] Some holes 61 on the rotating wheel 60 can also be left empty. That is, some holes 61 on the rotating wheel 60 are not fitted with any optical elements and remain in an empty state. When the rotating wheel 60 rotates to an empty hole 61, light will pass through directly without any optical processing. The empty holes 61 can also serve as spare positions for future upgrades or replacement of optical elements. In addition, the existence of empty holes 61 makes the design of the rotating wheel 60 more versatile, eliminating the need to equip all holes 61 with optical elements.

[0068] In some embodiments, the rotating wheel 60 includes at least four holes 61, wherein a circular polarizer 31 is provided on one hole 61, one hole 61 is empty, and a neutral density filter 32 is provided on each of the remaining holes 61, and the neutral density filter 32 on different holes 61 has a different light reduction level.

[0069] The light reduction level is a quantitative indicator used to describe the degree to which an ND filter attenuates light intensity. Different light reduction levels correspond to different ND values.

[0070] The ND filters at different aperture positions 61 have different light reduction levels (such as ND2, ND4, ND8, etc.), each corresponding to a different light intensity attenuation ratio. For example:

[0071] ND2 indicates that the light intensity is reduced by half (the transmittance of an ND filter is 50%).

[0072] ND4 indicates that the light intensity is reduced by one-quarter (the transmittance of an ND filter is 25%).

[0073] ND8 indicates that the light intensity is reduced by one-eighth (the transmittance of an ND filter is 12.5%).

[0074] For example, such as Figure 4 As shown, the rotating wheel 60 includes four apertures 61. One aperture 61 is equipped with a circular polarizer 31, one aperture 61 is empty, and the remaining two apertures 61 are each equipped with a neutral density filter 32. The neutral density filters 32 in different apertures 61 have different reduction levels. The two neutral density filters 32 are arranged adjacent to each other. The four apertures 61 are evenly spaced along the circumference, which ensures that the rotating wheel 60 is subjected to uniform force during rotation, reducing mechanical vibration or imbalance.

[0075] The different neutral density filter 32's reduction levels help adjust the amount of light entering the imaging sensor 10, thereby attenuating the intensity of stray light and ghosting caused by reflected light between the filter 20 and the imaging sensor 10, thus improving image quality. The higher the selected reduction level, i.e., the higher the ND value, the stronger the ability to partially or even completely eliminate stray light and ghosting caused by reflected light between the filter 20 and the imaging sensor 10, resulting in better image quality.

[0076] In other embodiments, the matting filter 30 is designed to be detachable. For example, the circular polarizer 31 or the neutral density filter 32 can be manually replaced as the matting filter 30 as needed.

[0077] In some embodiments, the image acquisition device 100 further includes a sensor 40 and a driving mechanism 50. The sensor 40 is used to sense the light intensity of the light spots on the display panel. The driving mechanism 50 is connected to a rotating wheel 60 and is used to drive the rotating wheel 60 to rotate. Specifically, the driving mechanism 50 drives the rotating wheel 60 to rotate according to the different light intensities of the light spots sensed by the sensor 40, so that the corresponding aperture 61 is positioned in the optical path from the filter 20 to the imaging sensor 10.

[0078] The sensor 40 can employ optical components such as photodiodes or CCD (Charge-Coupled Device) / CMOS sensors to accurately measure the light intensity of a specific area. The sensor 40 can sample the brightness of a single lamp point or the entire display area and generate corresponding data feedback to the drive mechanism 50.

[0079] The drive mechanism 50 is connected to the rotating wheel 60 and is responsible for automatically driving the rotating wheel 60 to rotate according to the light intensity changes detected by the sensor 40, selecting a suitable aperture position 61 to enter the light path from the filter 20 to the imaging sensor 10. Specifically, the drive mechanism 50 receives brightness data from the sensor 40 and determines, through an algorithm, which aperture position 61 needs to be switched to (such as the neutral density filter 32, the circular polarizer 31, or an empty aperture position 61). Based on the determination result, the drive mechanism 50 drives the rotating wheel 60 to rotate to the designated position, so that the target aperture position 61 is accurately aligned with the light path from the filter 20 to the imaging sensor 10.

[0080] The drive mechanism 50 includes a motor 52 and a control circuit 51. The motor 52 in the drive mechanism 50 can be of different types depending on the application scenario, such as a stepper motor, servo motor, or DC motor. The control circuit 51 is responsible for receiving brightness data from the sensor 40 and controlling the start, stop, speed, and direction of the motor 52 to ensure that the wheel 60 moves along a predetermined trajectory and that the target aperture 61 is accurately aligned with the optical path from the filter 20 to the imaging sensor 10. The control circuit 51 is also used to monitor the operating status of the motor 52 in real time and adjust control parameters to improve the stability and accuracy of the system.

[0081] For example, sensor 40 begins to detect the light intensity of the display panel light points, and drive mechanism 50 sets the vacant aperture 61 of wheel 60 as the default optical path in order to acquire raw brightness data. That is, control aperture 61 can serve as a reference measurement aperture 61 or a control aperture 61 in a comparison experiment.

[0082] Sensor 40 continuously monitors the light intensity of the light source and transmits the data to control circuit 51. Control circuit 51 determines whether the optical elements in the optical path from filter 20 to imaging sensor 10 need to be adjusted based on the brightness value.

[0083] In response to the light intensity of the lamp point detected by the sensor 40 being greater than or equal to the threshold, the drive mechanism 50 rotates the wheel 60 to select the appropriate aperture 61 of the neutral density filter 32 to enter the optical path from the filter 20 to the imaging sensor 10, thereby reducing the light intensity and eliminating the interference of stray light and ghost bright spots, improving the imaging quality, and thus improving the measurement accuracy.

[0084] In response to the light intensity of the lamp point detected by the sensor 40 being less than the threshold, the drive mechanism 50 rotates the wheel 60 to select the aperture 61 corresponding to the circular polarizer 31 to enter the optical path from the filter 20 to the imaging sensor 10, so as to eliminate the interference of stray light and ghost bright spots.

[0085] There is no limit to the threshold here; it can be selected based on actual needs.

[0086] In some embodiments, the filter 20 includes an X filter, a Y filter, and a Z filter, and the imaging sensor 10 includes a CMOS device.

[0087] The main function of filter 20 is to selectively transmit or block light of a specific wavelength, thereby enabling accurate measurement of color.

[0088] For example, the X filter (not shown), Y filter (not shown), and Z filter (not shown) of filter 20 are respectively mounted in different positions on a turntable (not shown). By rotating the turntable, any one of the X, Y, and Z filters can be placed individually in the optical path. By driving the turntable to rotate, the desired X, Y, or Z filter can be precisely moved to the correct position to measure light of different wavelengths as needed.

[0089] The CMOS device is specifically responsible for acquiring the light intensity data through the filter 20. The data acquired by the CMOS device is integrated to generate the final brightness and colorimetric results. This design, employing the filter 20 and the CMOS device, enables high-precision measurement of the light source's brightness and colorimetric properties.

[0090] In some embodiments, the image acquisition device 100 further includes a lens 70, which is disposed on the side of the filter 20 away from the matting filter 30.

[0091] Lens 70 focuses the light from the display panel onto filter 20, ensuring that the light is concentrated and enters the subsequent optical system. By adjusting the focal length of lens 70, the field of view of the acquired image can be changed, thereby adapting to different measurement needs.

[0092] For example, lens 70 includes structures such as an optical lens group (not shown) and an aperture (not shown). The optical lens group consists of multiple lenses used to focus light onto subsequent optical components, such as filter 20. These lenses include concave lenses, convex lenses, or a combination of both, to correct aberrations (such as spherical aberration, chromatic aberration, etc.) and ensure image sharpness. The aperture controls the amount of light entering lens 70, and adjusting the aperture size can affect exposure time and depth of field.

[0093] Please see Figures 1 to 6 , Figure 6 This is a schematic diagram of the structure of an embodiment of the filter-type imaging luminance and colorimeter provided in this application.

[0094] This application provides a filter-type imaging luminance and colorimeter 300, which includes the image acquisition device 100 and image processor 200 described above. The image processor 200 is used to receive and process light spot images from the image acquisition device 100.

[0095] The image acquisition device 100 is responsible for capturing the light from the target light source and converting it into a digital image signal. The image processor 200 analyzes and processes the received data to generate measurement results for brightness and color.

[0096] For example, the image processor 200 includes an analog-to-digital converter (ADC), a data storage unit, an image processing algorithm module, a microprocessor (digital signal processor), and an interface module, etc.

[0097] The analog-to-digital converter converts the analog electrical signal output by the image acquisition device 100 into a digital signal, ensuring the accuracy of luminance and chromaticity data.

[0098] The data storage unit includes a buffer and a calibration database. The buffer temporarily stores multi-channel raw image data (such as RGB sub-channel data). The calibration database stores calibration parameters such as the transmittance curve of filter 20 and the sensor response curve.

[0099] The image processing algorithm module combines data from 20 multi-channel filters to reconstruct the spectral power distribution of the measured object using weighted or interpolated methods, and converts the spectral data into luminance (cd / m²) based on CIE standards (such as the CIE 1931 XYZ color space). 2 The system calculates the chromaticity coordinates (x, y) and compensates for errors such as filter 20 aging and sensor nonlinear response to ensure long-term measurement stability.

[0100] Microprocessors perform real-time data processing tasks (such as spectral analysis and noise suppression) and support the efficient operation of complex algorithms.

[0101] The interface module includes output interfaces and control structures. The output interfaces transmit measurement results (such as luminance distribution maps, chromaticity maps, and spectral curves) via USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface), or Ethernet. The control interface receives external commands (such as triggering measurements or adjusting parameters).

[0102] The structure of the image processor 200 includes, but is not limited to, this, and may be selected according to actual needs.

[0103] Through the close cooperation between the image acquisition device 100 and the image processor 200, the filter-type imaging luminance and colorimeter 300 realizes full automation from light signal capture to spectral analysis, combining high efficiency and accuracy. Secondly, by adding an extinction plate 30 between the imaging sensor 10 and the filter 20 of the image acquisition device 100, at least part of the light transmitted between the filter 20 and the imaging sensor 10 is eliminated, so that unnecessary reflected light will not reach the surface of the imaging sensor 10 for imaging, thereby eliminating the interference of stray light and ghost bright spots, improving imaging quality, and thus improving measurement accuracy.

[0104] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0105] The above are merely embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. An image acquisition device, characterized in that, include: An imaging sensor is used to sense the light from the LEDs on the display panel and generate an image of the LEDs. A filter, spaced apart from the imaging sensor, is used to filter the light from the light source. An extinction plate is disposed in the optical path from the filter to the imaging sensor to eliminate at least a portion of the light transmitted between the filter and the imaging sensor.

2. The image acquisition device according to claim 1, characterized in that, The extinction plate includes a circular polarizer.

3. The image acquisition device according to claim 2, characterized in that, The circular polarizer includes a linear polarizer and a quarter-wave plate, with the linear polarizer positioned on the optical path from the filter to the quarter-wave plate.

4. The image acquisition device according to claim 1, characterized in that, The matting filter includes a neutral density filter.

5. The image acquisition device according to claim 1, characterized in that, The extinction plate includes a circular polarizer and a neutral density filter, the circular polarizer and the neutral density filter being disposed at different apertures on the same rotating wheel; the rotating wheel is configured such that, by rotation, one of the apertures can be positioned in the optical path from the filter to the imaging sensor.

6. The image acquisition device according to claim 5, characterized in that, The rotating wheel includes at least four apertures, one of which is equipped with the circular polarizer, one of which is empty, and the remaining apertures are equipped with a neutral density filter, and the neutral density filters at different apertures have different light reduction levels.

7. The image acquisition device according to claim 6, characterized in that, The image acquisition device also includes: A sensor for sensing the light intensity of the light spots on the display panel; A drive mechanism, connected to the rotating wheel, is used to drive the rotating wheel to rotate; The driving mechanism is used to drive the rotating wheel to rotate according to the different light intensities of the light points sensed by the sensor, so that the corresponding aperture is set in the optical path from the filter to the imaging sensor.

8. The image acquisition device according to claim 1, characterized in that, The filters include an X filter, a Y filter, and a Z filter, and the imaging sensor includes a CMOS device.

9. The image acquisition device according to any one of claims 1-7, characterized in that, The image acquisition device also includes a lens, which is disposed on the side of the filter away from the matting filter.

10. A filter-type imaging luminance and colorimeter, characterized in that, include: The image acquisition device is the image acquisition device according to any one of claims 1-9; An image processor is used to receive and process the light spot images from the image acquisition device.

Images