Crosstalk measurement method for light field 3D display equipment

Abstract

The invention discloses a light field 3D display equipment crosstalk measurement method, which comprises the steps of deploying an optical measurement platform and a three-dimensional scanning mechanical arm in a darkroom, and horizontally and obliquely placing light field 3D display equipment on the optical measurement platform; recording the observation position # imgabs0 # corresponding to the maximum brightness value as an optimal observation position pi corresponding to the ith viewpoint; introducing a multi-level gray scale based on the optimal observation position pi, and calculating a crosstalk value at the ith viewpoint when the luminosity is alpha; arithmetic averaging is carried out on the crosstalk under different luminosities, and the final crosstalk of the ith viewpoint is obtained; the influence of all viewpoints is comprehensively considered to accurately obtain the crosstalk of the light field 3D display equipment, and a multi-viewpoint crosstalk fusion strategy is established; and the final crosstalk of the light field 3D display equipment is calculated by using the results of the multiple measurements.

Description

Technical Field

[0001] The present invention relates to the field of 3D display technology, and particularly to a method for measuring crosstalk of a light field 3D display device. Background Art

[0002] The light field 3D display technology can reproduce the light distribution of a three-dimensional display scene by reconstructing the propagation trajectory of light in space, and can provide users with an immersive viewing experience. It has been widely applied in fields such as science and technology education and telemedicine. However, affected by factors such as the processing error of optical devices, the refractive index matching error of multi-layer optical structures, and light leakage between pixels, crosstalk between viewpoints is likely to occur, thereby reducing the display quality of the light field 3D display device. Therefore, designing a method for measuring crosstalk of a light field 3D display and measuring the crosstalk of a light field 3D display device, and then providing a reference for the structural optimization of a light field 3D display device, has important research significance.

[0003] In recent years, scientific and technological personnel have studied various methods for measuring crosstalk of traditional display devices, providing strong support for the research on the method for measuring crosstalk of a light field 3D display device. Skala et al. developed an automated crosstalk measurement system using a digital camera, and accurately measured the crosstalk of different display areas in the display screen to be measured by using geometric correction and brightness correction modules. Boev et al. proposed a method for measuring crosstalk of an autostereoscopic screen, and quantified the light leakage amount by using a multi-viewpoint image separation algorithm to achieve the measurement of screen crosstalk. Wu et al. analyzed the key factors causing binocular crosstalk and proposed a multi-point light chromaticity detection scheme for the screen to measure the crosstalk of the screen to be measured, improving the accuracy and speed of crosstalk measurement.

[0004] Although the above methods can measure the crosstalk of traditional display devices such as 2D display screens and autostereoscopic displays more accurately, they are usually designed for single-viewpoint or dual-viewpoint display devices. When directly applied to a light field 3D display device, due to the crosstalk caused by the intertwining of multi-viewpoint light not being fully considered, the accurate measurement of the crosstalk of the light field 3D display device cannot be achieved. Therefore, it is crucial to study a method for measuring crosstalk of a light field 3D display device. Summary of the Invention

[0005] The present invention provides a method for measuring crosstalk of a light field 3D display device. By comprehensively considering the crosstalk of multiple viewpoints in the viewing area of the light field 3D display device, the present invention fully explores the characteristics of the intertwining of multi-viewpoint light, thereby providing technical support for the structural design optimization of optical devices, as described in detail below:

[0006] A method for measuring crosstalk of a light field 3D display device, the method comprising:

[0007] Deploy an optical measurement platform and a 3D scanning robotic arm inside a darkroom, and horizontally tilt the light field 3D display device on the optical measurement platform;

[0008] Record the observation position corresponding to the maximum brightness value as the optimal observation position p corresponding to the i-th viewing point i ; Based on the optimal observation position p i Introduce multiple gray levels, and calculate the crosstalk value at the i-th viewing point when the brightness and darkness degree is α; Obtain the final crosstalk of the i-th viewing point by taking the arithmetic average of the crosstalk at different brightness and darkness degrees;

[0009] Taking into account the influence of all viewing points to accurately obtain the crosstalk of the light field 3D display device, a multi-viewpoint crosstalk fusion strategy is established;

[0010] Calculate the final crosstalk of the light field 3D display device using the results of multiple measurements.

[0011] Among them, the operation of recording the observation position corresponding to the maximum brightness value as the optimal observation position p corresponding to the i-th viewing point i Specifically:

[0012] Use the 3D scanning robotic arm to move the display brightness measurement analyzer to the p' i position, and collect the brightness value of the light field 3D display device at the p' i position

[0013] Create a square area centered at the position p ′ and containing multiple position points. All position points are evenly arranged. Use the 3D scanning robotic arm to move the display brightness measurement analyzer traversally to all position points in this square area, and synchronously collect the brightness values of the light field 3D display device corresponding to these position points;

[0014] Compare all the collected brightness values, and record the observation position corresponding to the maximum brightness value as the optimal observation position p corresponding to the i-th viewing point i .

[0015] Among them, the operation of introducing multiple gray levels based on the optimal observation position p i and calculating the crosstalk value at the i-th viewing point when the brightness and darkness degree is α is specifically:

[0016] Create an image element with the number of viewing points n*m on the computer, fill the gray scale image with the brightness and darkness degree of α into this image element to obtain a 3D video source, and use the 3D scanning robotic arm to move the display brightness measurement analyzer to the p i position to measure the brightness value of the light field 3D display device

[0017] Create a new image element with n*m viewpoints on the computer, fill a grayscale image with a brightness of α into the i-th viewpoint of the image element, and fill grayscale images with a brightness of 1-α into the remaining viewpoints of the image element to obtain a 3D video source. Use a three-dimensional scanning robotic arm to move the display brightness measurement analyzer to p i to measure the brightness value of the light field 3D display device

[0018] Create a new image element with n*m viewpoints on the computer, fill a grayscale image with a brightness of 1-α into the I-th viewpoint of the image element, and fill grayscale images with a brightness of α into the remaining viewpoints of the image element to obtain a 3D video source; Use a three-dimensional scanning robotic arm to move the display brightness measurement analyzer to p i to measure the brightness value of the light field 3D display device

[0019] Among them, the final crosstalk of the I-th viewpoint obtained by arithmetic averaging the crosstalk at different brightness levels is:

[0020] Based on and calculate the crosstalk value at the i-th viewpoint when the brightness is α

[0021]

[0022] Obtain the crosstalk of the i-th viewpoint at different brightness levels Obtain the final crosstalk of the i-th viewpoint by arithmetic averaging the crosstalk at different brightness levels:

[0023]

[0024] Obtain the crosstalk of the i-th viewpoint at different brightness levels Obtain the final crosstalk of the i-th viewpoint by arithmetic averaging the crosstalk at different brightness levels:

[0025]

[0026] The beneficial effects of the technical solution provided by the present invention are:

[0027] 1. The present invention solves the problem of insufficient exploration of the light interweaving characteristics of multiple viewpoints. By building a crosstalk measurement platform for light field 3D display devices, constructing a measurement mechanism for exploring the characteristics of light field 3D displays, and establishing a multi-viewpoint crosstalk fusion strategy, it realizes the accurate measurement of the crosstalk of light field 3D display devices and provides technical support for the optimization of the structural design of optical devices;

[0028] 2. The present invention solves the problem of insufficient reliability in single measurement. By constructing an error correction strategy based on a probability statistical model, it realizes the robustness of the crosstalk measurement process of the light field 3D display device and lays a technical foundation for the standardized application of the crosstalk measurement method for the light field 3D display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flowchart of the crosstalk measurement method for the light field 3D display device.

[0030] Figure 2 It is a multi-level grayscale image used in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the embodiments of the present invention in detail.

[0032] The following illustrates the specific implementation manners of the crosstalk measurement method for the light field 3D display device in the embodiments of the present invention through examples. Taking a light field 3D display device with n*m viewpoints as an example, the specific steps are as follows:

[0033] I. Build a crosstalk measurement platform for the light field 3D display device

[0034] To avoid the influence of ambient light on the measurement results, the measurement needs to be carried out in a darkroom. First, deploy an optical measurement platform and a three-dimensional scanning robotic arm inside the darkroom, and place the light field 3D display device horizontally and inclined at 45 degrees on the optical measurement platform.

[0035] II. Construct a measurement mechanism for mining the light field 3D display characteristics

[0036] (1) First, according to the design parameters of the light field 3D display device, calculate the theoretical optimal observation position p′ corresponding to the i-th viewpoint i . Then, create an image element with n*m viewpoints on the computer, produce a 3D source for calibrating the optimal observation position, and play the 3D source on the light field 3D display device.

[0037] (2) Use the three-dimensional scanning robotic arm to move the display brightness measurement analyzer to the position p′ i , and collect the brightness value of the light field 3D display device at the position p′ i Secondly, create a square area centered at the position p′ that contains multiple position points, and all the position points are evenly arranged. Then use the three-dimensional scanning robotic arm to move the display brightness measurement analyzer traversely to all the position points in this square area, and synchronously collect the brightness values of the light field 3D display device corresponding to these position points. Finally, compare all the collected brightness values, and take the observation position corresponding to the maximum brightness value i as the actual optimal observation position. Record the best observation position p corresponding to the i-th viewing point i 。

[0038] (3) Create a new image element with n*m viewing points on the computer, fill the grayscale image with grayscale α into this image element to obtain a 3D video source. Then, play the 3D video source on the light field 3D display device, and use the three-dimensional scanning robotic arm to move the display brightness measurement analyzer to p i to measure the brightness value of the light field 3D display device

[0039] (4) Create a new image element with n*m viewing points on the computer, fill the grayscale image with grayscale α into the i-th viewing point of this image element, and fill the grayscale image with grayscale 1-α into the remaining viewing points of this image element to obtain a 3D video source. Then, play the 3D video source on the light field 3D display device, and use the three-dimensional scanning robotic arm to move the display brightness measurement analyzer to p i to measure the brightness value of the light field 3D display device

[0040] (5) Create a new image element with n*m viewing points on the computer, fill the grayscale image with grayscale 1-α into the i-th viewing point of this image element, and fill the grayscale image with grayscale α into the remaining viewing points of this image element to obtain a 3D video source. Then, play the 3D video source on the light field 3D display device, and use the three-dimensional scanning robotic arm to move the display brightness measurement analyzer to p i to measure the brightness value of the light field 3D display device

[0041] (6) Based on and calculate the crosstalk value at the i-th viewing point when the grayscale is α The calculation formula is as follows:

[0042]

[0043] (7) Repeat steps (3)-(6) K times to obtain the crosstalk at different grayscales for the i-th viewing point Then, by taking the arithmetic mean of the crosstalk at different grayscales, obtain the final crosstalk for the i-th viewing point. The calculation formula is as follows:

[0044]

[0045] For example: Repeat steps (3)-(6) 4 times to obtain the crosstalk at different grayscales for the i-th viewing point Then, by taking the arithmetic mean of the crosstalk at different grayscales, obtain the final crosstalk for the i-th viewing point. The calculation formula is as follows:

[0046]

[0047] III. Establishing a multi-viewpoint crosstalk fusion strategy

[0048] Since the crosstalk of each viewpoint affects the display effect of the light field 3D display device, it is necessary to comprehensively consider the influence of all viewpoints to accurately obtain the crosstalk of the light field 3D display device. For this purpose, a multi-viewpoint crosstalk fusion strategy is established. By repeating the second step n*m times, the crosstalk ct of all viewpoints is calculated u (1 ≤ u ≤ n*m), and the crosstalk of the light field 3D display device is obtained by using an arithmetic mean operation. The calculation formula is as follows:

[0049]

[0050] In addition, to ensure the reliability of the measurement results, the embodiments of the present invention repeat the above process x times and calculate its arithmetic mean as the final crosstalk of the light field 3D display device The calculation formula is as follows:

[0051] IV. Establishing an error correction strategy based on a probability statistical model

[0052] To ensure the reliability and randomness of the measurement results, the embodiments of the present invention independently repeat the above process x times and record the crosstalk ct of the light field 3D display measured each time u (u = 1, 2,..., x), and finally the final crosstalk of the light field 3D display device is calculated using the results of multiple measurements The calculation formula is as follows:

[0053]

[0054] Among them, represents the crosstalk of the light field 3D display device obtained by the s-th measurement

[0055] The embodiments of the present invention repeat the above process 6 times and calculate its arithmetic mean as the final crosstalk of the light field 3D display device The calculation formula is as follows:

[0056]

[0057] V. Application of device crosstalk

[0058] After measuring the crosstalk of the light field 3D display device, by analyzing the crosstalk distribution characteristics of each viewing point of the light field 3D display device, the arrangement parameters of the microlens array or the backlight modulation scheme can be adjusted accordingly to reduce the mutual interference between adjacent viewing points. At the same time, the measurement results can also be used to establish a crosstalk evaluation model to guide the structural optimization of optical devices, and improve the uniformity of light field reconstruction by improving the design of the light absorption layer. Accurate crosstalk measurement can not only promote the research and development of high-quality light field 3D display devices, but also provide a data basis for the industry to formulate standardized test procedures, and accelerate the implementation of light field 3D technology in scenarios such as medical imaging and virtual interaction.

[0059] In the embodiments of the present invention, unless otherwise specified for the models of each device, the models of other devices are not limited, and any device that can perform the above functions can be used.

[0060] Those skilled in the art can understand that the drawings are only schematic diagrams of a preferred embodiment, and the serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0061] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for measuring crosstalk of a light field 3D display device, characterized in that: The method comprises: Deploy an optical measurement platform and a 3D scanning robot in a darkroom, and place the light field 3D display device horizontally and tilted on the optical measurement platform; The observation position corresponding to the maximum brightness value Recorded as the best observation position p corresponding to the i-th viewpoint i ; Based on the best observation position p i Introduce multi-level grayscale and calculate the crosstalk value at the i-th viewpoint when the brightness is α; obtain the final crosstalk at the i-th viewpoint by taking the arithmetic average of the crosstalk under different brightness; The influence of all viewpoints is comprehensively considered to accurately obtain the crosstalk of light field 3D display devices, and a multi-viewpoint crosstalk fusion strategy is established; The final crosstalk of the light field 3D display device is calculated using the results of multiple measurements.

2. A method for measuring crosstalk of a light field 3D display device according to claim 1, characterized in that: The observation position corresponding to the maximum brightness value Recorded as the best observation position p corresponding to the i-th viewpoint i Specifically: The display brightness measurement analyzer is moved to the p using a 3D scanning robot. i ′ Location, collection p i ′ Brightness value of the light field 3D display device at the location Create a new one with position p i ′ A square area with multiple position points as the center is formed, and all the position points are evenly arranged. A display brightness measurement analyzer is moved traversally to all the position points in the square area by using a three-dimensional scanning robot arm, and brightness values ​​of the light field 3D display device corresponding to these position points are synchronously collected; Compare all the collected brightness values ​​and find the observation position corresponding to the maximum brightness value. Recorded as the best observation position p corresponding to the i-th viewpoint i .

3. A method for measuring crosstalk of a light field 3D display device according to claim 1, characterized in that: The optimal observation position p i Introducing multi-level grayscale, the crosstalk value at the i-th viewpoint when the brightness is α is calculated as: Create a new image element with n*m viewpoints on the computer, fill the grayscale image with brightness α into the image element to obtain a 3D film source, and use a 3D scanning robot to move the display brightness measurement analyzer to p i Measure the brightness of the light field 3D display device Create a new image element with n*m viewpoints on the computer, fill the grayscale image with a brightness of α to the i-th viewpoint of the image element, and fill the grayscale image with a brightness of 1-α to the remaining viewpoints of the image element to obtain a 3D film source. Use a three-dimensional scanning robotic arm to move the display brightness measurement analyzer to p i Measure the brightness of the light field 3D display device Create a new image element with n*m viewpoints on the computer, fill the grayscale image with a brightness of 1-α to the i-th viewpoint of the image element, and fill the grayscale image with a brightness of α to the remaining viewpoints of the image element to obtain a 3D film source; use a three-dimensional scanning robotic arm to move the display brightness measurement analyzer to p i Measure the brightness of the light field 3D display device 4. The method for measuring crosstalk of a light field 3D display device according to claim 3, characterized in that: By performing arithmetic averaging on the crosstalk under different brightness, the final crosstalk of the i-th viewpoint is obtained as: based on as well as Calculate the crosstalk value at the i-th viewpoint when the brightness is α Get the crosstalk of the i-th viewpoint at different brightness By taking the arithmetic average of the crosstalk under different brightness, the final crosstalk of the i-th viewpoint is obtained: Get the crosstalk of the i-th viewpoint at different brightness By taking the arithmetic average of the crosstalk under different brightness, the final crosstalk of the i-th viewpoint is obtained:

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