Medium-free multi-angle naked eye three-dimensional imaging device and imaging method thereof

Abstract

The invention relates to a medium-free multi-angle naked eye three-dimensional imaging device and an imaging method thereof, and the device comprises a pedestal which is internally provided with a motor; the equipment mounting seat is connected with an output shaft of the motor; the outer limiting shell is in a vertically-through cylindrical shape and is mounted on the base; the rolling friction components are distributed in an annular array mode, installed on the periphery of the installation base or / and the top cover and connected with the inner wall face of the outer limiting shell in an abutting mode; optical glass is fixedly mounted on the top cover; the imaging method comprises the following steps: starting equipment, confirming the visual angle of an observer, generating a projection image matched with the corresponding visual angle, converting the projection image into a first projection image, and reconstructing the first projection image to generate a three-dimensional image with space depth information. The electronic screen equipment is placed in a high-speed rotating device, an image generated by the electronic screen equipment is projected on special optical glass, and a high-speed rotating and presenting method is combined, so that a picture in the electronic screen equipment is subjected to three-dimensional imaging on the optical glass.

Description

Technical Field

[0001] The present invention relates to a stereoscopic imaging device for supporting an electronic screen, in particular to a medium-free multi-angle naked-eye three-dimensional imaging device and an imaging method thereof. Background Art

[0002] Holographic projection technology uses optical principles to present three-dimensional images that can be recognized by the naked eye in a specific space or area. According to CN105372924A, the common holographic projection technologies mainly include the following three: 1. Projecting an image on small water droplets formed by the liquefaction of water vapor; 2. Ionizing air with a laser to emit light; 3. Projecting an image on a rapidly rotating mirror; Additionally, a mobile device bracket is also disclosed, which rotates a mobile device at a high speed around the central axis (any line parallel to the plane where the mobile device screen is located and passing through the center of gravity of the mobile device can be considered as the central axis) and displays specific content on the screen, so as to enable the user to see static stereoscopic holographic images and dynamic stereoscopic holographic animations.

[0003] However, regarding the method disclosed in CN105372924A, it is to consider the imaging based on the residual image of the human eye, but according to the test results, it is found that only planar patterns can be presented, and holographic images and dynamic stereoscopic holographic animations cannot be presented.

[0004] CN 207133497 U discloses a stereoscopic imaging lens, which realizes that the image collected by the camera presents a left-right format stereoscopic image with a human eye perception through means such as double-lens reflection. However, according to its principle, this stereoscopic image is not a real stereoscopic image, and the stereoscopic effect can only be presented when the human eye is in a relaxed state through natural focusing or wearing 3D glasses.

[0005] However, the above devices all have the following problems. First, there is a medium dependence, and a specific medium is required to display the stereoscopic image; second, there is a viewing angle limitation. Generally, a three-dimensional graph can only be presented at a specific viewing angle, and it may be a planar image from another angle. This type of device is relatively common in many museums. Moreover, there are refresh rate defects in traditional rotating LED / POV display technologies; finally, there are latency problems in existing gesture recognition and eye tracking technologies, resulting in poor stereoscopic imaging effects.

[0006] In general, the medium-free holographic display technology aims to create a true three-dimensional stereoscopic image. The core technical difficulty lies in how to construct a stable and clear holographic image in the air without any physical medium. This involves the precise control and spatial modulation of the light field, which requires breaking through the limitations of traditional optical principles. At the same time, how to achieve large-size, high-resolution holographic imaging is also a key issue, which requires a qualitative leap in the performance of core components such as light sources and light modulators. In addition, the real-time interactivity of holographic images places extremely high demands on computing power. How to achieve rapid calculation and rendering of complex light fields under limited hardware conditions is a problem that needs to be solved urgently. In practical applications, holographic display also faces challenges in energy consumption, cost, portability, etc., which directly affect the commercial prospects of the technology. Furthermore, how to give holographic images tactile feedback so that users can "touch" virtual objects is an important direction for expanding application scenarios. Summary of the invention

[0007] The purpose of the present invention is to provide a medium-free multi-angle naked-eye three-dimensional imaging device and an imaging method thereof, which places an electronic screen device in a high-speed rotating device, projects the image generated by the electronic screen device onto special optical glass, and combines it with high-speed rotation to enable the picture in the electronic screen device to achieve three-dimensional imaging on the optical glass.

[0008] The present invention is implemented by the following technical scheme: a medium-free multi-angle naked-eye three-dimensional imaging device and an imaging method thereof, comprising

[0009] A base 1, with a motor 2 installed inside;

[0010] The equipment mounting seat has a regular polygonal or circular cross-section; it is divided into a mounting base 31 and a top cover 32, the mounting base 31 is provided with a mounting groove 33 and the mounting groove 33 is used to place the projection module, the top cover 32 is detachably connected to the top of the mounting base 31, and the mounting base 31 is connected to the output shaft of the motor 2;

[0011] The outer limit housing 4 is in a cylindrical shape that penetrates from top to bottom and is installed on the base 1;

[0012] The rolling friction members 5 are distributed in an annular array and are mounted on the outer periphery of the mounting base 31 and / or the top cover 32 , and are in contact with the inner wall surface of the outer limit housing 4 ;

[0013] A TOF array sensor for obtaining spatial position information of the observer's eyes; and

[0014] An infrared eye tracker, which is used to obtain the gaze direction information of the observer's eyes;

[0015] Among them, a viewing window is opened on the top cover 32, and an optical glass 6 is fixedly installed on the viewing window. The TOF array sensor determines the viewing angle of the observer according to the obtained spatial position information of the observer's eyes and the viewing direction information of the observer's eyes obtained by combining with the infrared eye tracker.

[0016] For the determined viewing angle of the observer, the projection image content of the projection module is adjusted so that the three-dimensional image formed by the diffraction of the nanoimprint grating structure can match the viewing angle of the observer, enabling the observer to observe the correct naked-eye three-dimensional image.

[0017] An imaging method of a medium-free multi-angle naked-eye three-dimensional imaging device: includes the following steps:

[0018] Step 1: Place the turned-on projection module into the device mounting base, and then start the motor.

[0019] Step 2: Obtain the spatial position information and viewing direction information of the observer's eyes through the TOF array sensor and the infrared eye tracker, so as to obtain the viewing angle of the observer; and generate a first adjustment signal according to the viewing angle of the observer.

[0020] Step 3, the first adjustment signal controls the projection module to generate a target projection image matching the viewing angle data.

[0021] Step 4, adopt the mechanical synchronous ring technology to generate a first synchronous signal by using the motor encoder in the motor, and perform phase adjustment on the first synchronous signal through the FPGA to obtain a second synchronous signal; at the same time, generate a PWM waveform by using the RGB chromaticity space through the optical synchronous ring; realize the synchronous control of the motor and the projection module through the PWM waveform and the second synchronous signal.

[0022] The rotation signal after phase compensation controls the high-speed rotation of the motor and the synchronously rotating projection module, so that the projection module generates a first projection image.

[0023] Step 5: Diffract the first projection image through the nanoimprint grating structure; after obtaining the incident light field of the first projection image, reconstruct the incident light field through the Helmholtz equation in the rotating coordinate system, and generate a first diffraction image according to the reconstructed light field; the first diffraction image is a three-dimensional image with spatial depth information.

[0024] Wherein the Helmholtz equation is ∇²E(r,θ,z)+k²(1+Δn(r,θ,z) / n0)E = 0, E is the electric field distribution, k is the wave number, Δn(r,θ,z) is the refractive index change amount, and n0 is the reference refractive index.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. By combining a relatively simple high-speed rotating device with specific optical glass, a planar image formed by an electronic screen device can be holographically displayed after being projected onto the optical glass, achieving the purpose of medium-free multi-angle naked-eye three-dimensional imaging.

[0027] 2. The overall device has a low cost and a small volume, and the high-speed rotating device can be restricted by an outer limiting housing, featuring easy promotion and high safety performance.

[0028] 3. During the high-speed rotation process, a large amount of noise may be generated between the rolling friction member and the outer limiting housing. Subsequently, rubber is arranged in the area of the inner wall of the outer limiting housing corresponding to the running track of the rolling friction member to reduce noise.

[0029] 4. Through the cooperation of a mechanical synchronous ring and an optical synchronous ring, μs-level synchronous precision is achieved, solving the problem of delay in existing gesture recognition and eye tracking technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 is the structure diagram after removing the outer limiting housing on the basis of Figure 1 ;

[0032] Figure 3 is the structure diagram after removing the top cover on the basis of Figure 2 ;

[0033] Figure 4 is a schematic diagram of the glass mounting frame;

[0034] Figure 5 is a schematic flow chart of the principle of the present invention;

[0035] Reference numerals: 1 base, 2 motor, 31 mounting base, 32 top cover, 33 mounting groove, 34 notch, 35 slot, 36 annular rib, 37 device placement seat, 4 outer limiting housing, 41 flange structure, 5 rolling friction member, 6 optical glass, 61 glass mounting frame. DETAILED DESCRIPTION OF THE INVENTION

[0036] The following is a detailed description of the present invention with reference to the accompanying drawings:

[0037] A medium-free multi-angle naked-eye three-dimensional imaging device and its imaging method, comprising

[0038] a base 1, inside which a motor 2 is installed;

[0039] The equipment mounting seat has a regular polygonal or circular cross-section; it is divided into a mounting base 31 and a top cover 32, the mounting base 31 is provided with a mounting groove 33 and the mounting groove 33 is used to place the projection module, the top cover 32 is detachably connected to the top of the mounting base 31, and the mounting base 31 is connected to the output shaft of the motor 2;

[0040] The outer limit housing 4 is in a cylindrical shape that penetrates from top to bottom and is installed on the base 1;

[0041] The rolling friction members 5 are distributed in an annular array and are mounted on the outer periphery of the mounting base 31 and / or the top cover 32 , and are in contact with the inner wall surface of the outer limit housing 4 ;

[0042] A TOF array sensor for obtaining spatial position information of the observer's eyes; and

[0043] An infrared eye tracker, which is used to obtain the gaze direction information of the observer's eyes;

[0044] A window is provided on the top cover 32, and an optical glass 6 is fixedly mounted on the window. The TOF array sensor determines the viewing angle of the observer based on the acquired spatial position information of the observer's eyes and the gaze direction information of the observer's eyes acquired by the infrared eye tracker;

[0045] According to the determined observer viewing angle, the projection image content of the projection module is adjusted so that the three-dimensional image formed by the diffraction of the nanoimprint grating structure can match the observer viewing angle, so that the observer can observe the correct naked eye three-dimensional image.

[0046] Projection modules generally refer to devices such as mobile phones and tablet computers. Appropriate device mounts are produced or customized according to the size of the device. The following takes a mobile phone as an example.

[0047] The base here can be installed with some counterweight materials to ensure stability during high-speed rotation and avoid vibration or even tipping over due to shaking during high-speed rotation. Of course, heavier materials can also be used to make the base.

[0048] The device mounting seat adopts a split structure of a mounting base 31 and a top cover 32, mainly for the convenience of placing the mobile phone and for the subsequent locking of the mounting base 31 and the top cover 32 to limit the mobile phone and prevent the mobile phone from slipping and shaking when rotating at high speed.

[0049] Since the device mounting base and the mobile phone are not symmetric structures with respect to the center of gravity, during the high-speed rotation process, the center of gravity will deviate due to centrifugal force, resulting in device shaking or instability. Although there is a weighted base for stabilization, an outer limiting housing still needs to be provided to ensure its stability during operation. However, in order to limit the position through the outer limiting housing, it is necessary to ensure that the high-speed rotating device mounting base is in contact with the outer limiting housing. Therefore, rolling friction members are provided on the device mounting base.

[0050] The accuracy of the TOF array sensor is ±3 mm; the sampling rate of the infrared eye tracker is 250 Hz.

[0051] In addition, a safety protection mechanism is generally configured, such as abnormal rotation speed detection, that is, when the rotation amplitude > ±5% of the threshold, an emergency stop is triggered, and the emergency braking response time < 50 ms.

[0052] It should be noted that the top cover here can be a cover plate or an installation cover, which can be adjusted according to requirements.

[0053] A number of notches 34 are provided on the mounting base 31. The side walls of the notches 34 are provided with first screw holes. On the side of the top cover 32, there is a downwardly extending slot 35 corresponding to the notch 34. The slot 35 is provided with a first opening. The mounting base 31 and the top cover 32 are locked and connected by a first screw passing through the first opening and the first screw hole.

[0054] The design of the notch 34 and the slot 35 is mainly considered because the mounting base 31 and the top cover 32 rotate at high speed. If they are connected in a way similar to a flange structure, the force generated during the high-speed rotation process will directly act on the first screw. If the first screw breaks, it may cause safety problems. Through the structures of the mounting base 31 and the slot 35 themselves, the above problems can be effectively avoided, allowing the first screw to only play a role in connection and fixation without bearing additional external forces.

[0055] An annular rib 36 is provided on the outer periphery of the top cover 32 or the outer periphery of the mounting base 31. The rolling friction member 5 is mounted on the annular rib 36. If the outer diameters of the top cover 32 and the mounting base 31 are similar to the inner diameter of the outer limiting housing 4, it will be difficult for the outer limiting housing 4 to disengage. Moreover, in the actual production process, generally the base is set larger, and correspondingly the outer limiting housing 4 is also adapted to the base, while the top cover 32 and the mounting base 31 are adapted to the mobile phone, so there will be a diameter difference. Therefore, the diameter is compensated through the annular rib 36, and at the same time, it can also play a role in strengthening the top cover 32 and the mounting base 31.

[0056] The rolling friction member 5 is a ball bearing. The ball bearing is rotatably connected to the annular rib plate 36 through a rotating shaft, and a part of the ball bearing extends out of the edge of the annular rib plate 36 and abuts against the inner wall surface of the outer limit housing 4. The use of a ball bearing can effectively reduce the friction force and also reduce the additional load on the motor.

[0057] The base 1 is provided with positioning pins and a number of second screw holes. The bottom of the outer limit housing 4 is provided with a flange structure 41, and the flange structure 41 is provided with second through holes. The locking connection between the mounting base 31 and the top cover 32 is realized by a second screw passing through the first opening and the first screw hole.

[0058] Since the device mounting seat is located inside the outer limit housing 4, if the outer limit housing 4 is not separated, it will cause the device mounting seat to be unable to be opened, and correspondingly, the mobile phone cannot be placed.

[0059] It further includes a glass mounting frame 61. The optical glass 6 is mounted inside the glass mounting frame 61. A number of third openings are provided on the glass mounting frame 61, and third screw holes are provided on the top cover 32. The locking connection between the mounting base 31 and the top cover 32 is realized by a second screw passing through the third opening and the first screw hole.

[0060] The optical glass 6 belongs to a damaged item. Such a design can facilitate the replacement of the optical glass 6. The glass mounting frame 61 can be formed by enclosing a C-shaped frame and a straight frame, and a male-female groove is provided between the two to achieve cooperation. A limiting groove is provided on the inner side edge of the glass mounting frame. Or directly commission the manufacturer to produce a replaceable accessory that integrates the optical glass 6 and the glass mounting frame 61.

[0061] A device placement seat 37 is provided in the mounting groove 33. The device placement seat 37 is provided with an inclined placement surface for placing the projection module. The angle between the placement surface and the horizontal plane is 45 - 60 degrees. This is mainly used for placing mobile phones.

[0062] The optical glass (6) has a nanoimprinted grating structure, a refractive index of 2.0 - 2.2, and a light transmittance > 92%.

[0063] The motor (2) is a brushless motor with a rotational speed of 1800 ± 5 RPM and requires a magnetic levitation bearing when in use.

[0064] Rubber is disposed in the area of the inner wall surface of the outer limit housing 4 corresponding to the running track of the rolling friction member 5.

[0065] 11. According to the claim 1, an unrestricted multi-angle naked-eye three-dimensional imaging device, wherein: the projection module is a DLP micro-projection array module, and the recommended resolution is 2560×1440@120Hz.

[0066] 3D imaging method of an unrestrained multi-angle naked-eye 3D imaging device: The method includes the following steps:

[0067] Step 1: Place the turned-on projection module into the device mounting base, and then start the motor.

[0068] Step 2: Obtain the spatial position information and gaze direction information of the observer's eyes through the TOF array sensor and the infrared eye tracker, so as to obtain the observer's viewing angle; and generate a first adjustment signal according to the observer's viewing angle.

[0069] Step 3: The first adjustment signal controls the projection module to generate a target projection image matching the viewing angle data.

[0070] Step 4: Adopt the mechanical synchronization ring technology to generate a first synchronization signal using the motor encoder in the motor, and perform phase adjustment on the first synchronization signal through the FPGA to obtain a second synchronization signal; at the same time, generate a PWM waveform using the RGB chromaticity space through the optical synchronization ring; realize the synchronous control of the motor and the projection module through the PWM waveform and the second synchronization signal.

[0071] The rotation signal after phase compensation controls the high-speed rotation of the motor and the synchronously rotating projection module, so that the projection module generates a first projection image.

[0072] Step 5: Diffract the first projection image through the nanoimprint grating structure; after obtaining the incident light field of the first projection image, reconstruct the incident light field through the Helmholtz equation in the rotating coordinate system, and generate a first diffraction image according to the reconstructed light field; the first diffraction image is a 3D image with spatial depth information.

[0073] Wherein the Helmholtz equation is ∇²E(r,θ,z)+k²(1 + Δn(r,θ,z) / n0)E = 0, E is the electric field distribution, k is the wave number, Δn(r,θ,z) is the refractive index change amount, and n0 is the reference refractive index.

[0074] Wherein, the specific method for obtaining the observer's viewing angle through the TOF array sensor and the infrared eye tracker in Step 2 is

[0075] Process 1: Obtain the first confidence level of the observer's gesture through the TOF array; Process 2: Obtain the gaze dwell time of the observer's eyes through the infrared eye tracker; Process 3: If the first confidence level is greater than the preset threshold, perform gesture interaction according to the spatial position information; if the gaze dwell time is greater than the preset time, perform fixation interaction according to the gaze direction information; Process 4: Determine the observer's viewing angle through the gesture interaction or the fixation interaction.

[0076] In step 3, the specific manner in which the first adjustment signal controls the projection module to generate a target projection image matching the perspective data is

[0077] Process 1: Establish a conversion matrix between the Cartesian coordinate system and the rotation coordinate system;

[0078] [X'] [cosθ -sinθ 0] [X]

[0079] [Y'] = [sinθ cosθ 0] [Y]

[0080] [Z'] [ 0 0 1] [Z]

[0081] Sub-pixel level calibration per cycle with an accuracy of 0.1 px; Process 2: Perform coordinate transformation on the perspective data through the conversion matrix to obtain the transformed perspective data; Process 3: Generate a first projection adjustment signal according to the transformed perspective data; Process 4: Control the projection module to generate an adjusted first projection image through the first projection adjustment signal.

[0082] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. 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 medium-free multi-angle naked-eye three-dimensional imaging device, characterized in that: include A base (1) having a motor (2) installed therein; An equipment mounting base, the cross section of which is a regular polygonal or circular structure; it is divided into a mounting base (31) and a top cover (32); the mounting base (31) is provided with a mounting groove (33) and the mounting groove (33) is used to place a projection module; the top cover (32) is detachably connected to the top of the mounting base (31); the mounting base (31) is connected to the output shaft of the motor (2); The outer limit housing (4) is in the shape of a cylinder that penetrates from top to bottom and is mounted on the base (1); The rolling friction components (5) are distributed in an annular array and are mounted on the outer periphery of the mounting base (31) and / or the top cover (32), and are in contact with the inner wall surface of the outer limit shell (4); A TOF array sensor for obtaining spatial position information of the observer's eyes; and An infrared eye tracker, which is used to obtain the gaze direction information of the observer's eyes; A window is provided on the top cover (32), and an optical glass (6) is fixedly mounted on the window. The TOF array sensor determines the viewing angle of the observer based on the acquired spatial position information of the observer's eyes and the gaze direction information of the observer's eyes acquired by the infrared eye tracker; According to the determined observer viewing angle, the projection image content of the projection module is adjusted so that the three-dimensional image formed by the diffraction of the nanoimprint grating structure can match the observer viewing angle, so that the observer can observe the correct naked eye three-dimensional image.

2. The medium-free multi-angle naked-eye three-dimensional imaging device according to claim 1, characterized in that: The mounting base (31) is provided with a plurality of notches (34), side walls of the notches (34) are provided with first screw holes, a slot (35) extending downward and corresponding to the notches (34) is provided on the side of the top cover (32), and a first opening is provided on the slot (35), and a locking connection between the mounting base (31) and the top cover (32) is achieved by a first screw rod passing through the first opening and the first screw hole.

3. The medium-free multi-angle naked-eye three-dimensional imaging device according to claim 1, characterized in that: An annular rib plate (36) is provided on the outer periphery of the top cover (32) or the outer periphery of the mounting base (31), and the rolling friction component (5) is mounted on the annular rib plate (36); The rolling friction component (5) is a ball bearing, which is rotatably connected to the annular rib plate (36) via a rotating shaft, and the ball bearing portion extends out of the edge of the annular rib plate (36) and abuts against the inner wall surface of the outer limit housing (4).

4. The medium-free multi-angle naked-eye three-dimensional imaging device according to claim 1, characterized in that: The base (1) is provided with a positioning pin and a plurality of second screw holes, a flange structure (41) is provided at the bottom of the outer limit shell (4), and a second through hole is provided on the flange structure (41), and a locking connection between the mounting base (31) and the top cover (32) is achieved by a second screw rod passing through the first opening and the first screw hole.

5. The medium-free multi-angle naked-eye three-dimensional imaging device according to claim 1, characterized in that: It also includes a glass mounting frame (61), the optical glass (6) being mounted in the glass mounting frame (61), a plurality of third openings being provided on the glass mounting frame (61), a third screw hole being provided on the top cover (32), and a locking connection between the mounting base (31) and the top cover (32) being achieved by a second screw rod passing through the third opening and the first screw hole.

6. The medium-free multi-angle naked-eye three-dimensional imaging device according to claim 1, characterized in that: The optical glass (6) is a nano-imprinted grating structure with a refractive index of 2.0-2.2 and a light transmittance of >92%.

7. The medium-free multi-angle naked-eye three-dimensional imaging device according to claim 1, characterized in that: The projection module is a DLP micro-projection array module.

8. The imaging method of the medium-free multi-angle naked-eye three-dimensional imaging device according to claim 1 comprises the following steps: Step 1: Place the turned-on projection module into the device mount, then start the motor; Step 2: Obtain the spatial position information and gaze direction information of the observer's eyes through the TOF array sensor and the infrared eye tracker, thereby obtaining the observer's viewing angle; and generate a first adjustment signal according to the observer's viewing angle; Step 3, a first adjustment signal controls the projection module to generate a target projection image matching the viewing angle data; Step 4, using a mechanical synchronization ring technology to use a motor encoder in the motor to generate a first synchronization signal, and adjusting the phase of the first synchronization signal through FPGA to obtain a second synchronization signal; at the same time, using an optical synchronization ring to use RGB color space to generate a PWM waveform; and realizing synchronous control of the motor and the projection module through the PWM waveform and the second synchronization signal; The phase-compensated rotation signal controls the high-speed rotation of the motor and the synchronously rotating projection module, so that the projection module generates a first projection image; Step 5: diffracting the first projection image through the nanoimprint grating structure; after obtaining the incident light field of the first projection image, reconstructing the incident light field through the Helmholtz equation in the rotating coordinate system, and generating a first diffraction image according to the reconstructed light field; the first diffraction image is a three-dimensional image with spatial depth information; The Helmholtz equation is ∇²E(r,θ,z)+k²(1+Δn(r,θ,z) / n0)E=0, where E is the electric field distribution, k is the wave number, Δn(r,θ,z) is the refractive index change, and n0 is the reference refractive index.

9. The imaging method of the medium-free multi-angle naked-eye three-dimensional imaging device according to claim 8 is characterized in that: The specific method of obtaining the observer's perspective by using the TOF array sensor and the infrared eye tracker in step 2 is: Process 1: Acquire a first confidence of the observer's gesture through the TOF array; Process 2: Acquire the gaze dwell time of the observer's eyes through the infrared eye tracker; Process 3: If the first confidence is greater than a preset threshold, perform gesture interaction according to the spatial position information; if the gaze dwell time is greater than a preset time, perform gaze interaction according to the gaze direction information; Process 4: Determine the observer's viewing angle through the gesture interaction or the gaze interaction.

10. The imaging method of the medium-free multi-angle naked-eye three-dimensional imaging device according to claim 8, characterized in that: The specific method of the first adjustment signal in step 3 controlling the projection module to generate a target projection image matching the viewing angle data is as follows: Process 1: Establish the transformation matrix between the Cartesian coordinate system and the rotation coordinate system; [X'] [cosθ -sinθ 0] [X] [Y'] = [sinθ cosθ 0] [Y] [Z'] [ 0 0 1] [Z] Sub-pixel calibration is performed for each cycle with an accuracy of 0.1px; Process 2: performing coordinate transformation on the viewing angle data through the transformation matrix to obtain the transformed viewing angle data; Process 3: generating a first projection adjustment signal according to the transformed viewing angle data; Process 4: controlling the projection module to generate an adjusted first projection image through the first projection adjustment signal.

Images