Method for testing number of viewpoints of 3D display equipment

Abstract

The invention discloses a method for testing the number of viewpoints of 3D display equipment, and the method comprises the steps: making a light field 3D display equipment viewpoint test film source based on 3D modeling software; constructing a light field 3D display equipment viewpoint number test system in the darkroom; detecting the number of viewpoints of the light field 3D display equipment by using a 3D display equipment viewpoint number test system; and testing the number of viewpoints of the light field 3D display equipment, and applying a test result. By comprehensively considering the viewpoint distribution of the light field 3D display equipment in the horizontal and vertical directions, the viewpoint test dimension is expanded, the problem that a previous method is only suitable for horizontal viewpoint distribution is solved, and the number of viewpoints of the light field 3D display equipment is accurately tested.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D display, and particularly to a method for testing the number of viewpoints of a 3D display device. Background Art

[0002] As a new display technology capable of reproducing three-dimensional scenes, the light field 3D display technology records and reproduces light field information, enabling users to perceive the depth information of images without wearing auxiliary devices, thereby obtaining an immersive 3D visual experience. It has become an innovation direction in the consumer electronics field. However, problems such as crosstalk and uneven viewpoint distribution often occur during the process of reconstructing the light field, which can lead to phenomena such as artifacts and viewpoint jumps in the display screen.

[0003] In recent years, researchers and display device manufacturing companies have proposed various methods for testing the number of viewpoints for different types of 3D display devices. Boher et al. regarded the position with the highest 3D contrast as the best viewing position, and used local perspective measurement and global imaging measurement to test the effective viewpoint distribution and the range of the viewing area of active glasses, passive glasses, and autostereoscopic displays respectively. Huang et al. proposed an objective test method for viewpoints based on equivalent luminance and binocular luminance. By deriving the theoretical formulas for the horizontal and vertical ranges of the viewing area through a geometric model, and combining ray tracing simulation and manual experiments for verification, the accuracy of testing the number of viewpoints of a parallax barrier type autostereoscopic display was improved. Others used a goniometric system and a confocal system to test the viewpoint positions of the screen to be measured, and combined crosstalk calculation and a geometric model to propose a method for testing the number of viewpoints applicable to naked-eye 3D display devices of types such as parallax barrier type and lenticular lens type.

[0004] Although the above-mentioned test methods can accurately test the number of viewpoints of traditional naked-eye 3D display devices such as parallax barrier type or lenticular lens type, these methods are designed based on the horizontal single-dimensional parallax detection principle and are only applicable to two-viewpoint or multi-viewpoint naked-eye 3D display devices with horizontal viewpoint distribution, and cannot be applied to light field 3D display devices with viewpoint distribution in both horizontal and vertical directions. Therefore, it is crucial to study a method for testing the number of viewpoints of light field 3D display devices. Summary of the Invention

[0005] The present invention provides a method for testing the number of viewpoints of a 3D display device. By comprehensively considering the viewpoint distribution in both the horizontal and vertical directions of the light field 3D display device, the present invention expands the viewpoint test dimension, alleviates the problem that the previous methods are only applicable to horizontal viewpoint distribution, and accurately tests the number of viewpoints of the light field 3D display device, as described in detail below:

[0006] A method for testing the number of viewpoints of a 3D display device, the method comprising:

[0007] Based on 3D modeling software, produce the viewpoint test source for the light field 3D display device;

[0008] Build a light field 3D display device viewpoint number test system in a dark room;

[0009] Use the 3D display device viewpoint number test system to detect the number of viewpoints of the light field 3D display device;

[0010] Test the number of viewpoints of the light field 3D display device and apply the test results.

[0011] Among them, the production of the viewpoint test source for the light field 3D display device is as follows:

[0012] Construct a standard test model library, which contains N×M three-dimensional models, and each three-dimensional model corresponds to an observation viewpoint;

[0013] For each three-dimensional model, use 3D modeling software to set N×M virtual cameras at different viewpoint positions and render the images corresponding to the viewpoints, and combine these images together to generate the viewpoint image array of this three-dimensional model;

[0014] For each viewpoint, obtain the viewpoint image array generated by its corresponding three-dimensional model, make a test source for each viewpoint, and finally obtain the test sources from viewpoint 1 to viewpoint N×M.

[0015] Among them, the detection of the number of viewpoints of the light field 3D display device by using the 3D display device viewpoint number test system is specifically as follows:

[0016] According to the control device parameters of the light field 3D display device and the viewing distance of the human eye, calculate the theoretical display positions of all viewpoints;

[0017] For each viewpoint at the theoretical display position, construct a square grid position array area centered on the theoretical display position of this viewpoint to simulate the light field distribution around the viewpoint;

[0018] Based on the light field 3D display device viewpoint number test system, conduct a viewpoint number test, play the test source at viewpoint n, and use a three-dimensional scanning robotic arm to control the rotation and movement of the camera to traverse all positions in the theoretical display position of viewpoint n and its corresponding square grid position array area;

[0019] During the traversal process, take pictures of the display screen of the light field 3D display device at each position. After the traversal is completed, perform feature recognition on all the taken images. If the features of the three-dimensional model corresponding to viewpoint n can be recognized, it means that viewpoint n exists; otherwise, it indicates that viewpoint n does not exist; complete the test from viewpoint 1 to N×M.

[0020] Among them, the method further includes: if the corresponding stereo model features can be recognized from the viewing point 1 to N×M, it indicates that the number of viewing points T of the light field 3D display device reaches N×M.

[0021] Among them, a standardized viewing point number test process is established based on the test results, providing a basis for equipment selection in application scenarios such as virtual reality, medical diagnosis, and industrial design.

[0022] The beneficial effects of the technical solution provided by the present invention are:

[0023] 1. By making a viewing point test source for the light field 3D display device, constructing a viewing point number test system for the light field 3D display device, detecting the number of viewing points of the light field 3D display device, and data verification and analysis, the present invention alleviates the limitation that the previous method is only applicable to horizontal viewing point distribution;

[0024] 2. The present invention realizes accurate testing of the number of viewing points of the light field 3D display device, and can provide an effective reference for optimizing the display quality of the light field 3D display device. Description of the Drawings

[0025] Figure 1 It is a flowchart of a method for testing the number of viewing points of a 3D display device. Detailed Embodiments )

[0026] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below.

[0027] The following examples are used to illustrate the specific implementation manners of the method for testing the number of viewing points of a 3D display device in the embodiments of the present invention.

[0028] Taking a light field 3D display device with N×M viewing points as an example, the specific steps are as follows:

[0029] I. Making a viewing point test source for the light field 3D display device

[0030] In the embodiment of the present invention, based on 3D modeling software, a test source is made for each viewing point.

[0031] (1) First, a standard test model library is constructed, which contains N×M stereo models, and each stereo model corresponds to an observation viewing point.

[0032] (2) Then, for each stereo model, N×M virtual cameras are set at different viewing point positions by using 3D modeling software, and the images corresponding to the viewing points are rendered. These images are combined together to generate a viewing point image array of the stereo model. The above operations are performed on all stereo models, and a total of N×M viewing point image arrays are generated. Each viewing point image array contains N×M viewing point images.

[0033] (3) Subsequently, for each viewing point, obtain the array of view images generated by its corresponding stereoscopic model, and create a test film source for each viewing point. Taking the production process of the test film source for the nth viewing point as an example, obtain the array of view images of the stereoscopic model corresponding to viewing point n, retain the nth view image in the array of view images, black out the other view images, and generate the test film source at viewing point n through pixel mapping. Perform the above operation process for all viewing points. Finally, the embodiments of the present invention can produce test film sources from viewing point 1 to viewing point N×M.

[0034] II. Construct a test system for the number of viewing points of a light field 3D display device

[0035] To reduce the interference of ambient light sources on the test of the number of viewing points of a light field 3D display device and achieve automated testing, the embodiments of the present invention construct a test system for the number of viewing points of a light field 3D display device in a darkroom.

[0036] Specifically, first, fix the light field 3D display device on the test platform in the darkroom. At the same time, link the high-precision camera with the three-dimensional scanning robotic arm so that the robotic arm can accurately control the angle and position of the camera to simulate the viewing experience of a person at different viewing points. In addition, according to the optimal viewing distance of the human eye, set the distance between the camera and the light field 3D display device to ensure that the viewing point information recorded during the test conforms to the visual perception of the human eye.

[0037] Among them, the embodiments of the present invention set the distance between the camera and the light field 3D display device to 30 - 50 cm to ensure that the viewing point information recorded during the test conforms to the visual perception of the human eye.

[0038] III. Detect the number of viewing points of a light field 3D display device

[0039] After completing the construction of the test system for the number of viewing points of the light field 3D display device, the embodiments of the present invention use this system to detect the number of viewing points of the light field 3D display device.

[0040] (1) First, calculate the theoretical display positions of all viewing points according to the control device parameters of the light field 3D display device and the human eye viewing distance.

[0041] (2) Then, for each of these viewing points, construct a square grid position array area centered on the theoretical display position of this viewing point to simulate the light field distribution in the space around the viewing point.

[0042] (3) Perform the viewpoint number test based on the viewpoint number test system of the light field 3D display device. Taking the nth viewpoint as an example, play the test video source at viewpoint n, and use the three-dimensional scanning robotic arm to control the rotation and movement of the camera to traverse all positions in the theoretical display position of viewpoint n and the corresponding square grid position array area. During the traversal process, take pictures of the display screen of the light field 3D display device at each position. After the traversal is completed, use the feature recognition algorithm to perform feature recognition on all the captured images. If the stereoscopic model features corresponding to viewpoint n can be recognized, it means that viewpoint n exists; otherwise, it indicates that viewpoint n does not exist.

[0043] (4) Based on the above steps, complete the test from viewpoint 1 to N×M.

[0044] If the corresponding stereoscopic model features can be recognized from viewpoint 1 to N×M, it means that the viewpoint number T of the light field 3D display device reaches N×M.

[0045] IV. Data Verification and Analysis

[0046] In order to improve the accuracy of the viewpoint number test and obtain more stable test results, execute the above process L times and record the viewpoint number detection results each time. Then, calculate the average value of the detection results of the L test processes to obtain the average viewpoint number. The calculation formula is as follows:

[0047]

[0048] Among them, T i is the number of viewpoints detected in each test, and T ave is the viewpoint number of the light field 3D display device obtained from the final test.

[0049] In the embodiment of the present invention, the above process is executed 6 times, and the viewpoint number detection results each time are recorded. Then, calculate the average value of the detection results of the 6 test processes to obtain the average viewpoint number. The calculation formula is as follows:

[0050]

[0051] Among them, T i is the number of viewpoints detected in each test, and T ave is the viewpoint number of the light field 3D display device obtained from the final test.

[0052] V. Application of the Viewpoint Number Parameter of the Device

[0053] After testing the number of viewpoints parameter of the light field 3D display device, by analyzing the viewpoint distribution in the horizontal and vertical directions, a quantifiable evaluation benchmark can be provided for the optimization of the optical structure of the light field display system, effectively guiding the design of the microlens array, the development of the optical path control algorithm, and the optimization of the pixel arrangement of the display panel. At the same time, by establishing the mapping relationship between the number of viewpoints and visual comfort, the visual fatigue of users when viewing the light field 3D display device can be alleviated, the depth perception of the three-dimensional scene can be enhanced, and the immersion can be improved. In addition, by testing the number of viewpoints parameter of the device and establishing a standardized test process for the number of viewpoints, a basis can be provided for the device selection in application scenarios such as virtual reality, medical diagnosis, and industrial design, promoting the consumer application process of the light field 3D display device.

[0054] 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.

[0055] 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 testing the number of viewpoints of a 3D display device, characterized in that, The method includes: Based on 3D modeling software, producing a viewpoint test source for the light field 3D display device; Constructing a light field 3D display device viewpoint number test system in a dark room; Using the 3D display device viewpoint number test system to detect the number of viewpoints of the light field 3D display device; Testing the number of viewpoints of the light field 3D display device and applying the test results.

2. The method for testing the number of viewpoints of a 3D display device according to claim 1, wherein The production of the viewpoint test source for the light field 3D display device is as follows: Constructing a standard test model library, which contains N×M stereoscopic models, and each stereoscopic model corresponds to an observation viewpoint; For each stereoscopic model, using 3D modeling software to set N×M virtual cameras at different viewpoint positions and rendering the images corresponding to the viewpoints, and combining these images to generate a viewpoint image array of the stereoscopic model; For each viewpoint, obtaining the viewpoint image array generated by its corresponding stereoscopic model, making a test source for each viewpoint, and finally obtaining the test sources from viewpoint 1 to viewpoint N×M.

3. A method for testing the number of viewpoints of a 3D display device according to claim 1, characterized in that, The specific detection of the number of viewpoints of the light field 3D display device by using the 3D display device viewpoint number test system is as follows: Calculating the theoretical display positions of all viewpoints according to the control device parameters of the light field 3D display device and the human eye viewing distance; For each viewpoint at the theoretical display position, constructing a square grid position array area centered on the theoretical display position of the viewpoint to simulate the light field distribution around the viewpoint; Based on the light field 3D display device viewpoint number test system for viewpoint number testing, playing the test source at viewpoint n, and using a three-dimensional scanning robotic arm to control the camera to rotate and move to traverse all positions in the theoretical display position of viewpoint n and its corresponding square grid position array area; During the traversal process, taking pictures of the display screen of the light field 3D display device at each position. After the traversal is completed, performing feature recognition on all the taken images. If the stereoscopic model features corresponding to viewpoint n can be recognized, it means that viewpoint n exists; Otherwise, it indicates that viewpoint n does not exist; complete the test from viewpoint 1 to N×.

4. A method for testing the number of viewpoints of a 3D display device according to claim 3, characterized in that, The method further includes: If the corresponding stereoscopic model features can be recognized from viewpoint 1 to N×M, it means that the number of viewpoints T of the light field 3D display device reaches N×M.

5. A method for testing the number of viewpoints of a 3D display device according to claim 1, characterized in that, Establishing a standardized viewpoint number test process based on the test results to provide a basis for equipment selection in application scenarios such as virtual reality, medical diagnosis, and industrial design.

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