Method and device for evaluating definition of three-dimensional light field display

Abstract

The invention provides a definition evaluation method and device for three-dimensional light field display. The method comprises the following steps: determining a limit reference resolution corresponding to a limit image frequency under any zero plane of a three-dimensional light field; under any display depth in the display depth range of the three-dimensional light field, the spatial frequency transmission capability value of the three-dimensional light field stereo image is extracted, and analysis is carried out based on the limit reference resolution and a change curve between the image frequency of each three-dimensional light field stereo image and the spatial frequency transmission capability value under different display depths. According to the method provided by the invention, the limit reference resolution corresponding to the limit image frequency under any zero plane of the three-dimensional light field is determined; based on the limit reference resolution and the change curve between the image frequency of each three-dimensional light field stereo image and the spatial frequency transfer capability value under different display depths, the comprehensive and accurate quantitative evaluation between the display depth and the three-dimensional light field display definition is realized.

Description

Technical Field

[0001] The present invention relates to the field of three-dimensional display technology, and in particular to a method and device for evaluating the clarity of three-dimensional light field display. Background Art

[0002] Three-dimensional light field display technology can achieve three-dimensional images with large size, true color, true depth and correct spatial occlusion relationship. It is a hot topic in the current research of three-dimensional display technology and plays an important role in many fields such as medicine, education, and military. Therefore, if the display quality of the three-dimensional light field is seriously damaged, it will greatly affect the presentation quality of the device content. At present, there are very few evaluation methods for how influencing factors affect the display quality of 3D displays. In particular, there are fewer evaluation methods for how display depth affects the display quality of 3D displays, and the accuracy of the evaluation results is low. Summary of the invention

[0003] The present invention provides a method and device for evaluating the clarity of a three-dimensional light field display, which are used to solve the defects in the prior art that there are few evaluation methods for how display depth affects the display quality of a 3D display, and the accuracy of the evaluation results is low.

[0004] The present invention provides a method for evaluating the clarity of a three-dimensional light field display, comprising: Acquire experimental signal images; Adjusting the image frequency of the experimental signal image to determine the limit reference resolution corresponding to the limit image frequency at any zero plane of the three-dimensional light field; At any display depth within the display depth range of the three-dimensional light field, adjusting the image frequency of the experimental signal image to obtain a three-dimensional light field stereo image corresponding to each image frequency; The spatial frequency transfer capability value of the three-dimensional light field stereo image is extracted, and a change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at the limit reference resolution and different display depths is analyzed to obtain a clarity evaluation result of the three-dimensional light field display.

[0005] According to a method for evaluating the clarity of a three-dimensional light field display provided by the present invention, the image frequency of the experimental signal image is adjusted to obtain a three-dimensional light field stereo image corresponding to each image frequency, including: Based on the limit image frequency, determining an image frequency adjustment range; Based on the image frequency adjustment range, the image frequency of the experimental signal image is adjusted from small to large to obtain a three-dimensional light field stereo image corresponding to each image frequency.

[0006] According to a method for evaluating the clarity of a three-dimensional light field display provided by the present invention, the step of extracting and obtaining a spatial frequency transfer capability value of the three-dimensional light field stereo image includes: Performing data preprocessing on the three-dimensional light field stereo image to obtain a preprocessed light field image; Based on analyzing the pattern contrast in the pre-processed light field image, the modulation transfer function data of the pre-processed light field image is calculated to obtain the spatial frequency transfer capability value.

[0007] According to a method for evaluating the clarity of a three-dimensional light field display provided by the present invention, the experimental signal image is constructed based on a black and white line pair image with sinusoidal brightness changes.

[0008] According to a method for evaluating the clarity of a three-dimensional light field display provided by the present invention, the image frequency of the experimental signal image is adjusted to determine the limit reference resolution corresponding to the limit image frequency under any zero plane of the three-dimensional light field, including: Adjusting the image frequency of the experimental signal image until the black and white line pairs in the experimental signal image cannot be distinguished, thereby obtaining the limit image frequency; The limit reference resolution is determined based on an experimental signal image at the limit image frequency at any zero plane of the three-dimensional light field.

[0009] According to a method for evaluating the clarity of a three-dimensional light field display provided by the present invention, the method further comprises: adjusting the zero plane position of the three-dimensional light field; Performing optimization analysis based on the clarity evaluation results of the three-dimensional light field display at each zero plane position to obtain a clarity evaluation index value of the three-dimensional light field display; Based on the clarity evaluation index value, optical element parameters of the display device are obtained.

[0010] The present invention also provides a device for evaluating the clarity of a three-dimensional light field display, comprising: A signal preparation unit, which obtains experimental signal images; A limit measurement unit, which adjusts the image frequency of the experimental signal image to determine a limit reference resolution corresponding to the limit image frequency at any zero plane of the three-dimensional light field; A three-dimensional light field imaging unit, which adjusts the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain a three-dimensional light field stereo image corresponding to each image frequency; The evaluation unit extracts the spatial frequency transfer capability value of the three-dimensional light field stereo image, and analyzes the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at the limit reference resolution and different display depths to obtain a clarity evaluation result of the three-dimensional light field display.

[0011] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the clarity evaluation method for three-dimensional light field display as described above is implemented.

[0012] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for evaluating the clarity of a three-dimensional light field display as described in any one of the above is implemented.

[0013] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements any one of the above-mentioned methods for evaluating the clarity of a three-dimensional light field display.

[0014] The clarity evaluation method and device for three-dimensional light field display provided by the present invention determine the limit reference resolution corresponding to the limit image frequency under any zero plane of the three-dimensional light field by adjusting the image frequency of the experimental signal image; adjust the image frequency of the experimental signal image under any display depth within the display depth range of the three-dimensional light field to obtain three-dimensional light field stereo images corresponding to each image frequency; extract the spatial frequency transfer capability value of the three-dimensional light field stereo image, analyze and evaluate based on the limit reference resolution and the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image under different display depths, thereby realizing a comprehensive and accurate quantitative evaluation between the display depth and the three-dimensional light field display clarity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is one of the flow charts of the method for evaluating the clarity of a three-dimensional light field display provided by the present invention; Figure 2 This is the second flow chart of the method for evaluating the clarity of a three-dimensional light field display provided by the present invention; Figure 3This is one of the structural schematic diagrams of the clarity evaluation device for three-dimensional light field display provided by the present invention; Figure 4 This is the second structural schematic diagram of the clarity evaluation device for three-dimensional light field display provided by the present invention; Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In view of the above problems, the present invention provides a method for evaluating the clarity of a three-dimensional light field display, so as to achieve accurate clarity evaluation of the three-dimensional light field display, and further realize the design of an optical system that meets different requirements. Figure 1 is one of the flow charts of the method for evaluating the clarity of a three-dimensional light field display provided by the present invention, such as Figure 1 As shown, the method includes: Step 110, acquiring an experimental signal image; Here, the experimental signal image refers to an image that can effectively measure the limiting resolution of an image displayed in a three-dimensional light field and can be used as a benchmark for evaluation. For example, a black and white line pair image with sinusoidal brightness changes can be used as the experimental signal image.

[0019] Step 120, adjusting the image frequency of the experimental signal image to determine a limit reference resolution corresponding to the limit image frequency at any zero plane of the three-dimensional light field; Here, the zero plane of the 3D light field refers to a reference plane with a display depth of 0, and its imaging effect can be regarded as the imaging effect of a 2D plane. Therefore, the limit reference resolution corresponding to the limit image frequency under the zero plane can be determined as a reference value for the display clarity of subsequent 3D light field stereo images at different depths.

[0020] Specifically, the relative position of the screen of the three-dimensional light field display device can be accurately adjusted during the initialization phase of each experiment to determine the zero plane of the three-dimensional light field of this experiment. Then, the image frequency of the experimental signal image can be adjusted from small to large until the experimental signal image displayed in the three-dimensional light field achieves a preset display effect. For example, when the experimental signal image is a black and white line pair image with sinusoidal brightness changes, the image frequency of the experimental signal image can be adjusted until the black and white line pair pattern in the experimental signal image displayed in the three-dimensional light field cannot be distinguished, and the image frequency at this time is used as the limit image frequency, and the resolution of the experimental signal image displayed in the three-dimensional light field at this time is used as the limit reference resolution.

[0021] Step 130, adjusting the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain a three-dimensional light field stereo image corresponding to each image frequency; Specifically, the display depth range required for the experiment can be determined by the expected optical system performance and application scenarios. Then, multiple appropriate test points, i.e., multiple display depths, can be arbitrarily selected within the display depth range. During the test phase, for any display depth within the display depth range of the three-dimensional light field, i.e., at any test point, the image frequency of the experimental signal image can be adjusted from small to large to obtain a three-dimensional light field stereo image corresponding to each image frequency. The three-dimensional light field stereo image here refers to a 3D stereo image displayed by a three-dimensional light field display device.

[0022] It should be noted that in a two-dimensional display, the display quality of an image can be described by resolution, that is, the total number of pixels in the horizontal and vertical directions, usually expressed in terms of the number of pixels, such as 1920x108. Compared with two-dimensional image information, the clarity evaluation method for a three-dimensional light field display provided by an embodiment of the present invention has higher pixels and accuracy, and has better depth information and a three-dimensional effect.

[0023] In addition, it should be noted that the method based on the resolution of two-dimensional display is not completely applicable to three-dimensional display. In the embodiment of the present invention, a special experimental signal image is used as a test pattern, which contains stripes of different directions and frequencies. The three-dimensional light field stereo images of these patterns are captured by the optical system, and the stripe contrast in the three-dimensional light field stereo images is analyzed to calculate the spatial frequency transmission capacity values ​​in different directions and depths. Not only the image quality in the horizontal and vertical directions is considered, but also the changes in the depth direction. Therefore, it can be used as a technical indicator to measure the ability of the optical system to transmit spatial frequencies in different directions and depths.

[0024] Step 140: extracting the spatial frequency transfer capability value of the three-dimensional light field stereo image, analyzing the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at the limit reference resolution and different display depths, and obtaining a clarity evaluation result of the three-dimensional light field display.

[0025] Here, the spatial frequency transfer capability value can be used to reflect the clarity of the three-dimensional light field stereo image. Specifically, the spatial frequency transfer capability value of each three-dimensional light field stereo image can be obtained by extraction. Then, the curve difference at different display depths can be compared by constructing a change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at different display depths. For example, the spatial frequency transfer capability values ​​at different display depths under the same image frequency can be compared to obtain the influence of different display depths on the spatial frequency transfer capability value. At the same time, the spatial frequency transfer capability values ​​at different display depths can be compared and analyzed by the limit reference resolution to determine whether the clarity of the three-dimensional light field stereo image meets expectations. Through multi-angle evaluation, a comprehensive and accurate three-dimensional light field stereo image clarity evaluation result is obtained.

[0026] It should be noted that the analysis of the clarity evaluation results of the three-dimensional light field display obtained after applying the evaluation method can be used to optimize the optical system. For example, adjusting the optical elements: adjusting the design of the lens, mirror or other optical elements according to the data to improve the image quality; for example, optimizing the light source: improving the uniformity and stability of the light source to reduce the impact on the display quality of the display, etc. In addition, the evaluation method provided in the embodiment of the present invention can also be applied to the optimized system to verify the optimization effect, compare the data curves before and after the optimization, and ensure that the performance is improved; according to the verification results, further adjustments and optimizations can be made, and the testing and analysis process can be repeated until satisfactory display quality is achieved to achieve iterative optimization of the optical system, which provides a more comprehensive and accurate quantitative evaluation method for the three-dimensional light field display quality.

[0027] The method provided by the embodiment of the present invention determines the limit reference resolution corresponding to the limit image frequency under any zero plane of the three-dimensional light field display by adjusting the image frequency of the experimental signal image; adjusts the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain the three-dimensional light field stereo image corresponding to each image frequency; extracts the spatial frequency transfer capability value of the three-dimensional light field stereo image, and analyzes and evaluates the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at the limit reference resolution and different display depths, thereby realizing a comprehensive and accurate quantitative evaluation between the display depth and the three-dimensional light field display clarity.

[0028] Based on any of the above embodiments, in step 130, adjusting the image frequency of the experimental signal image to obtain a three-dimensional light field stereo image corresponding to each image frequency includes: Based on the limit image frequency, determining an image frequency adjustment range; Based on the image frequency adjustment range, the image frequency of the experimental signal image is adjusted from small to large to obtain a three-dimensional light field stereo image corresponding to each image frequency.

[0029] Specifically, the limit image frequency can be used as the maximum value in the image frequency adjustment range. Thus, the image frequency of the experimental signal image can be adjusted from small to large to obtain a three-dimensional light field stereo image corresponding to each image frequency.

[0030] Based on any of the above embodiments, in step 140, extracting and obtaining the spatial frequency transfer capability value of the three-dimensional light field stereo image includes: Performing data preprocessing on the three-dimensional light field stereo image to obtain a preprocessed light field image; Based on analyzing the pattern contrast in the pre-processed light field image, the modulation transfer function data of the pre-processed light field image is calculated to obtain the spatial frequency transfer capability value.

[0031] Specifically, first, data preprocessing can be performed on the three-dimensional light field stereo image, including but not limited to image and processing operations such as correction, filtering, and image enhancement, so as to improve the image quality and make the image clearer. Then, the modulation transfer function data of the preprocessed light field image can be calculated by measuring and analyzing the pattern contrast in the preprocessed light field image. The calculated modulation transfer function data is used as the spatial frequency transmission capability value. It should be noted that the modulation transfer function data can reflect the performance of the three-dimensional light field imaging system at different spatial frequencies. Generally, the higher the modulation transfer function data, the better the performance of the imaging system, the higher the clarity, and the more image details that can be transmitted.

[0032] Based on any of the above embodiments, the experimental signal image is constructed based on a black and white line pair image with sinusoidal brightness variation.

[0033] Here, the black and white line pair image with sinusoidal brightness changes is consistent with the principle of the MTF (Modulation Transfer Function) function, and can effectively measure the image limit resolution at different display depths.

[0034] Based on any of the above embodiments, in step 130, adjusting the image frequency of the experimental signal image to determine the limit reference resolution corresponding to the limit image frequency at any zero plane of the three-dimensional light field includes: Adjusting the image frequency of the experimental signal image until the black and white line pairs in the experimental signal image cannot be distinguished, thereby obtaining the limit image frequency; The limit reference resolution is determined based on an experimental signal image at the limit image frequency at any zero plane of the three-dimensional light field.

[0035] Specifically, the image frequency of the experimental signal image can be adjusted on any zero plane of the three-dimensional light field until the black and white line pairs in the experimental signal image displayed in the three-dimensional light field cannot be distinguished, that is, the limit of visual resolution is reached. It should be noted that since the display effect of the zero plane is the best, the upper limit frequency of the resolution determined under this condition will serve as the unified limit reference value of the entire display system at different depths, that is, the limit reference resolution, which is convenient for subsequent data analysis and processing.

[0036] Based on any of the above embodiments, the method further includes: adjusting the zero plane position of the three-dimensional light field; Performing optimization analysis based on the clarity evaluation results of the three-dimensional light field display at each zero plane position to obtain a clarity evaluation index value of the three-dimensional light field display; Based on the clarity evaluation index value, optical element parameters of the display device are obtained.

[0037] Specifically, the relative position of the display screen can be precisely adjusted in each experimental initialization phase to manipulate the zero plane position in the three-dimensional light field. Then, the clarity evaluation results of the three-dimensional light field display at each zero plane position can be optimized and analyzed to obtain the clarity evaluation index value of the three-dimensional light field display. In detail, a curve graph of the limit frequency changing with the zero plane position can be constructed. Since the display quality at the zero plane position is the best, the curve graph will reflect the limit image frequency of the display screen at different positions. According to the design requirements of the depth range, the three-dimensional light field display screen is fixed, and the imaging clarity of the display screen content passing through the optical element is measured at different zero plane positions. By analyzing the data, a curve of the zero plane position and frequency changing with the display depth is obtained, that is, based on the clarity evaluation results of the three-dimensional light field display at each zero plane position, an optimization analysis is performed to obtain the clarity evaluation index value of the three-dimensional light field display. Finally, the obtained clarity evaluation index value of the three-dimensional light field display can be used to guide the basic structural design of the grating to ensure that the best display effect and clarity are achieved under different screen positions and grating configurations, that is, the optical element parameters of the three-dimensional light field display device are obtained.

[0038] It should be noted that by analyzing the display quality, the optical design of the display system can be optimized more accurately to improve the overall three-dimensional display performance, and different three-dimensional light field displays can be better designed according to different needs. For example, the grating design can be adjusted for specific depth range requirements to achieve the best display effect. Since the display depth range and display clarity are two mutually constrained parameters for three-dimensional light field displays, the application of this evaluation method can find the corresponding grating line number that meets the depth range requirements and ensures display clarity when designing the equipment, thereby realizing the design of an optical system that meets different needs.

[0039] In one embodiment, Figure 2 FIG. 2 is a flow chart of the method for evaluating the clarity of a three-dimensional light field display provided by the present invention. Figure 2 As shown, the optical system is a three-dimensional light field, and A and B are different screen positions of the optical system. Among them, the input display image is a black and white line pair image with sinusoidal brightness changes. Figure 2 The right side of the middle shows the zero planes corresponding to different screen positions, that is, the zero plane corresponding to screen position A , the zero plane corresponding to the B screen position , and ,the display depth range at different screen positions.

[0040] The specific experimental process may include: Adjust the display screen position: Before each experiment, adjust the display screen position to change the zero plane position of the display content after passing through the optical element. Experimental signal setting: Use a black and white line pair image with sinusoidal brightness changes as the experimental signal. This signal is suitable for evaluating the limit frequency at different zero plane positions. Measure the limit frequency: At each adjusted zero plane position, repeat the experimental steps to determine the limit frequency, that is, the highest frequency at which the black and white line pairs cannot be clearly distinguished at this position. Data processing and analysis: Analyze the experimental data and draw a curve of the limit frequency versus the zero plane position. Since the display quality at the zero plane position is the best, the curve will reflect the limit frequency of the display screen at different positions. Evaluate the depth range: According to the design requirements of the depth range, fix the light field display screen, and measure the imaging clarity of the display screen content passing through the optical element at different zero plane positions. By analyzing the data, a curve of the zero plane position and frequency versus depth is obtained. Determine the clarity design parameters: According to the design requirements of clarity, study the influence of the number of grating lines. Under different grating configurations, measure the change of frequency with the zero plane position and draw the corresponding curve. Guide grating design: Finally, the obtained frequency variation curve is used to guide the basic structural design of the grating to ensure the best display effect and clarity under different screen positions and grating configurations.

[0041] It should be noted that the method provided by the embodiment of the present invention evaluates the image quality of the three-dimensional light field display at different depth layers through the following depth analysis steps of the display device. Define the display depth range. Specifically, first, determine the display depth range required for the experiment based on the expected optical system performance and application scenarios. Set test points: Set a suitable number of test points within the defined display depth range to more carefully evaluate the change of display quality with depth. Adjust the test program: For each predetermined display depth, adjust the depth range of the test program to ensure that all test points from the shallowest to the deepest are covered. Record the screen position of each test point for subsequent data analysis. Perform frequency measurement: At each test point, use the black and white line pair image with sinusoidal brightness changes as the experimental signal to measure the limit frequency at this depth. Repeat the measurement to ensure the accuracy and repeatability of the data. Record and analyze data: Record the limit frequency data for each test point. Analyze the data and draw a curve chart of the limit frequency versus display depth. Evaluate display clarity: For each display depth test point, analyze the display clarity of the imaging by the proposed evaluation method. Record the clarity data and compare and analyze it with the limit frequency data. This method can evaluate the image quality of 3D light field displays at different depth layers, which is crucial for displays to create more realistic and detailed 3D visual effects.

[0042] Moreover, it can solve the problem that traditional two-dimensional resolution cannot evaluate the clarity of images at different depths. That is, first use multiple cameras or sensors to capture light field images from different perspectives; secondly, decompose the light field scene into images of different depth layers, apply test patterns of different spatial frequencies at different depth layers, and measure the MTF value of each layer to evaluate the resolution and quality of each layer; create a three-dimensional resolution map to show the resolution changes at different depths. It helps to evaluate and optimize the depth perception ability of three-dimensional displays.

[0043] In one embodiment, Figure 3 FIG. 1 is one of the structural schematic diagrams of the clarity evaluation device for three-dimensional light field display provided by the present invention, such as Figure 3 As shown, the device includes: a display module, an optical imaging module, an image acquisition data analysis module, and an evaluation and optimization module. The display module is used to adjust the display screen position: in each experimental initialization phase, the relative position of the display screen is accurately adjusted to manipulate the zero plane position in the optical system, thereby affecting the focal depth and field depth of the imaging system; experimental signal configuration: a black and white line pair pattern with sinusoidally modulated brightness is used as a test signal, which is designed to quantitatively evaluate the resolution limit of the imaging system at different zero plane positions.

[0044] The light field imaging module consists of a projection reflector and a curved reflector, which is used to form a three-dimensional light field stereo image through the optical system. The limit frequency is measured for the formed three-dimensional light field stereo image. That is, for each set zero plane position, a series of experimental operations are performed to accurately determine the limit frequency value, that is, at this specific position, the imaging system can no longer distinguish the highest spatial frequency of the black and white line pair pattern. This process involves a detailed analysis of the performance of the imaging system to ensure that an accurate modulation transfer function evaluation is obtained.

[0045] The image acquisition data analysis module is used to collect three-dimensional images of the display screen content within a certain depth range at different zero plane positions through the optical element, and obtain the curve of the zero plane position and frequency changing with depth through data processing and analysis, and obtain the display clarity evaluation index value; The evaluation and optimization module is used to obtain the device display quality evaluation based on the display clarity evaluation index value, and guide the design of the basic structure of the optical element such as the number of grating lines in combination with the design requirements for clarity and device display depth, so as to meet the actual application requirements of achieving the best display effect and clarity under different screen positions and grating configurations.

[0046] Based on any of the above embodiments, Figure 4 FIG. 2 is a second structural diagram of a clarity evaluation device for a three-dimensional light field display provided by the present invention. Figure 4 As shown, the device comprises: A signal preparation unit 410 is used to obtain an experimental signal image; A limit measurement unit 420 adjusts the image frequency of the experimental signal image to determine a limit reference resolution corresponding to the limit image frequency at any zero plane of the three-dimensional light field; The three-dimensional light field imaging unit 430 adjusts the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain a three-dimensional light field stereo image corresponding to each image frequency; The evaluation unit 440 extracts the spatial frequency transfer capability value of the three-dimensional light field stereo image, and analyzes the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at the limit reference resolution and different display depths to obtain a clarity evaluation result of the three-dimensional light field display.

[0047] The device provided by the embodiment of the present invention determines the limit reference resolution corresponding to the limit image frequency under any zero plane of the three-dimensional light field by adjusting the image frequency of the experimental signal image; adjusts the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain the three-dimensional light field stereo images corresponding to each image frequency; extracts the spatial frequency transfer capability value of the three-dimensional light field stereo images, and analyzes and evaluates the change curves between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at the limit reference resolution and different display depths, thereby realizing a comprehensive and accurate quantitative evaluation between the display depth and the three-dimensional light field display clarity.

[0048] Based on any of the above embodiments, the three-dimensional light field imaging unit is specifically used for: Based on the limit image frequency, determining an image frequency adjustment range; Based on the image frequency adjustment range, the image frequency of the experimental signal image is adjusted from small to large to obtain a three-dimensional light field stereo image corresponding to each image frequency.

[0049] Based on any of the above embodiments, the limit measurement unit is specifically used for: Performing data preprocessing on the three-dimensional light field stereo image to obtain a preprocessed light field image; Based on analyzing the pattern contrast in the pre-processed light field image, the modulation transfer function data of the pre-processed light field image is calculated to obtain the spatial frequency transfer capability value.

[0050] Based on any of the above embodiments, the experimental signal image is constructed based on a black and white line pair image with sinusoidal brightness changes.

[0051] Based on any of the above embodiments, the limit measurement unit is further specifically used for: Adjusting the image frequency of the experimental signal image until the black and white line pairs in the experimental signal image cannot be distinguished, thereby obtaining the limit image frequency; The limit reference resolution is determined based on an experimental signal image at the limit image frequency at any zero plane of the three-dimensional light field.

[0052] Based on any of the above embodiments, the device further includes an analysis unit, which is specifically used for: adjusting the zero plane position of the three-dimensional light field; Performing optimization analysis based on the clarity evaluation results of the three-dimensional light field display at each zero plane position to obtain a clarity evaluation index value of the three-dimensional light field display; Based on the clarity evaluation index value, optical element parameters of the display device are obtained.

[0053] Figure 5An example of a physical structure diagram of an electronic device is shown in FIG. Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530 and a communication bus 540, wherein the processor 510, the communication interface 520 and the memory 530 communicate with each other through the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute the clarity evaluation method of the three-dimensional light field display, the method comprising: obtaining an experimental signal image; adjusting the image frequency of the experimental signal image to determine the limit reference resolution corresponding to the limit image frequency under any zero plane of the three-dimensional light field; adjusting the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain a three-dimensional light field stereo image corresponding to each image frequency; extracting and obtaining the spatial frequency transfer capability value of the three-dimensional light field stereo image, and analyzing the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at different display depths based on the limit reference resolution and the three-dimensional light field stereo image. The clarity evaluation result of the three-dimensional light field display is obtained.

[0054] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0055] On the other hand, the present invention also provides a computer program product, which includes a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the three-dimensional light field display clarity evaluation method provided by the above methods, the method including: acquiring an experimental signal image; adjusting the image frequency of the experimental signal image to determine the limit reference resolution corresponding to the limit image frequency under any zero plane of the three-dimensional light field; adjusting the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain a three-dimensional light field stereo image corresponding to each image frequency; extracting the spatial frequency transfer capability value of the three-dimensional light field stereo image, and analyzing the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at different display depths to obtain the clarity evaluation result of the three-dimensional light field display.

[0056] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the clarity evaluation method for three-dimensional light field display provided by the above-mentioned methods, the method comprising: acquiring an experimental signal image; adjusting the image frequency of the experimental signal image to determine the limit reference resolution corresponding to the limit image frequency under any zero plane of the three-dimensional light field; adjusting the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain a three-dimensional light field stereo image corresponding to each image frequency; extracting the spatial frequency transfer capability value of the three-dimensional light field stereo image, and analyzing the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at different display depths to obtain a clarity evaluation result of the three-dimensional light field display.

[0057] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0058] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the clarity of a three-dimensional light field display, characterized in that: include: Acquire experimental signal images; Adjusting the image frequency of the experimental signal image to determine the limit reference resolution corresponding to the limit image frequency at any zero plane of the three-dimensional light field; At any display depth within the display depth range of the three-dimensional light field, adjusting the image frequency of the experimental signal image to obtain a three-dimensional light field stereo image corresponding to each image frequency; The spatial frequency transfer capability value of the three-dimensional light field stereo image is extracted, and a change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at the limit reference resolution and different display depths is analyzed to obtain a clarity evaluation result of the three-dimensional light field display.

2. The method for evaluating the clarity of a three-dimensional light field display according to claim 1, characterized in that: The step of adjusting the image frequency of the experimental signal image to obtain a three-dimensional light field stereo image corresponding to each image frequency includes: Based on the limit image frequency, determining an image frequency adjustment range; Based on the image frequency adjustment range, the image frequency of the experimental signal image is adjusted from small to large to obtain a three-dimensional light field stereo image corresponding to each image frequency.

3. The method for evaluating the clarity of a three-dimensional light field display according to claim 1, characterized in that: The extracting and obtaining the spatial frequency transfer capability value of the three-dimensional light field stereo image includes: Performing data preprocessing on the three-dimensional light field stereo image to obtain a preprocessed light field image; Based on analyzing the pattern contrast in the pre-processed light field image, the modulation transfer function data of the pre-processed light field image is calculated to obtain the spatial frequency transfer capability value.

4. The method for evaluating the clarity of a three-dimensional light field display according to any one of claims 1 to 3, characterized in that: The experimental signal image is constructed based on a black and white line pair image with sinusoidal brightness variation.

5. The method for evaluating the clarity of a three-dimensional light field display according to claim 4, characterized in that: The step of adjusting the image frequency of the experimental signal image to determine the limit reference resolution corresponding to the limit image frequency at any zero plane of the three-dimensional light field includes: Adjusting the image frequency of the experimental signal image until the black and white line pairs in the experimental signal image cannot be distinguished, thereby obtaining the limit image frequency; The limit reference resolution is determined based on an experimental signal image at the limit image frequency at any zero plane of the three-dimensional light field.

6. The method for evaluating the clarity of a three-dimensional light field display according to any one of claims 1 to 3, characterized in that: The method further comprises: adjusting the zero plane position of the three-dimensional light field; Performing optimization analysis based on the clarity evaluation results of the three-dimensional light field display at each zero plane position to obtain a clarity evaluation index value of the three-dimensional light field display; Based on the clarity evaluation index value, optical element parameters of the display device are obtained.

7. A clarity evaluation device for three-dimensional light field display, characterized in that: include: A signal preparation unit, which obtains experimental signal images; A limit measurement unit, which adjusts the image frequency of the experimental signal image to determine a limit reference resolution corresponding to the limit image frequency at any zero plane of the three-dimensional light field; A three-dimensional light field imaging unit, which adjusts the image frequency of the experimental signal image at any display depth within the display depth range of the three-dimensional light field to obtain a three-dimensional light field stereo image corresponding to each image frequency; The evaluation unit extracts the spatial frequency transfer capability value of the three-dimensional light field stereo image, and analyzes the change curve between the image frequency and the spatial frequency transfer capability value of each three-dimensional light field stereo image at the limit reference resolution and different display depths to obtain a clarity evaluation result of the three-dimensional light field display.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for evaluating the clarity of a three-dimensional light field display according to any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for evaluating the clarity of a three-dimensional light field display according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for evaluating the clarity of a three-dimensional light field display according to any one of claims 1 to 6 is implemented.

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