A holographic projection interactive display system and method based on tourist location awareness

Abstract

The application discloses a holographic projection interactive display system and method based on tourist position sensing, and the system comprises: a space-time sensing subsystem which collects three-dimensional coordinates, sight distance and skeleton data of tourists in real time; an intention and safety subsystem which encapsulates the data into a response vector and evaluates the legality of the difference value at adjacent moments; a holographic rendering engine which dynamically restricts the pixel power quota according to the sight distance; and a light machine servo subsystem which drives the projection hardware to vertically translate and align the height of the tourist line of sight, and drives the light source to adjust the reconstruction focal length along the light path linear displacement. When the difference value is out of limit, the system intercepts the action flow, forces the ambient light compensation to be zero, and cuts off the motor enablement. The application eliminates parallax distortion and display memory bottleneck, realizes physical depth of field occlusion of digital disintegration, and realizes flexible discouragement of malicious collision.

Description

Technical Field

[0001] This invention relates to the field of holographic projection technology, and in particular to a holographic projection interactive display system and interaction method based on visitor location perception. Background Technology

[0002] In recent years, holographic projection technology has been widely used in exhibition and display fields such as smart museums, providing visitors with an intuitive three-dimensional visual experience; however, existing holographic interactive display systems still face many technical bottlenecks in practical applications.

[0003] First, traditional holographic systems typically use a fixed physical height and static projection focal length, which cannot adapt to the viewing height of visitors (such as adults and children). In addition, when visitors zoom in or deconstruct virtual exhibits through interaction, the fixed optical path cannot compensate for changes in the depth of field of the image, which can easily cause optical distortion, ghosting, and visual dizziness.

[0004] Secondly, existing motion-sensing interactions mainly rely on local and single near-field recognition, lacking a smooth lifecycle connection mechanism from far-field pre-search, mid-field transition to near-field micro-exploration; and in environments with high visitor flow and multiple booths, the system cannot dynamically allocate GPU computing power budget according to the actual viewing distance of visitors, often resulting in ineffective computing power waste or rendering lag during peak interaction periods.

[0005] Finally, the environment of public exhibition halls is complex, and visitors often exhibit abnormal interactive behaviors such as accidental touches, violent shaking, or even malicious slapping of the exhibition stands. The existing system lacks physical isolation between software and hardware and multimodal safety filtering mechanisms. When faced with sudden anomalies, it is not only easy for the control logic to malfunction and the electromechanical mechanism to be damaged by impact, but it also cannot provide effective circuit breaker protection and physical negative feedback for sudden changes in on-site lighting and uncivilized interactive behaviors. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a holographic projection interactive display system and interaction method based on visitor location awareness, thereby solving the problems mentioned in the background technology.

[0007] To achieve the above-mentioned technical objectives, the present invention provides a holographic projection interactive display system based on visitor location awareness, including: a multi-granular spatiotemporal perception subsystem 100, used to collect the visitor's absolute spatial coordinates, straight-line viewing distance, and skeletal motion data in real time; The intent center and safety barrier subsystem 200 is communicatively connected to the multi-granularity spatiotemporal perception subsystem 100. It is used to encapsulate the skeletal motion data into a spatiotemporal dynamic response vector and continuously evaluate the legality of the difference between adjacent time moments. When the difference is legal, it outputs a view deconstruction instruction and a physical target displacement signal. When the difference exceeds the limit, it triggers a safety interception signal. The holographic rendering engine 300 is communicatively connected to the intent center and the security barrier subsystem 200. It is used to dynamically constrain the pixel computing power quota according to the line-of-sight distance and output a holographic video stream with wavefront depth parameters based on the view deconstruction instructions. The optomechanical servo execution subsystem 400 is communicatively connected to the intent center and safety barrier subsystem 200 and the holographic rendering engine 300. It is used to receive the physical target displacement signal to drive the projection hardware to perform vertical physical displacement to align with the visitor's line of sight height, and to drive the light source of the projection hardware to perform mechanical linear displacement along the optical path axis according to the wavefront depth parameters, so as to dynamically adjust the physical reconstruction focal length of the holographic wavefront interference.

[0008] Furthermore, the multi-granularity spatiotemporal perception subsystem 100 uniquely binds the skeletal motion data to a specific tourist identity by calculating the spatial Euclidean distance and cosine similarity between the velocity vector output by the ultra-wideband global positioning module 110 and the instantaneous velocity vector output by the mid-near field vision module 120 within the same time window.

[0009] Furthermore, the intent center and security barrier subsystem 200 establishes an adaptive reference zero point at the moment of intercepting the pinching of two fingers, and applies viscous damping filtering to the stretching displacement of both hands before driving the screen to generate magnetic deconstruction according to the hierarchical threshold; its built-in automotive-grade security MCU autonomously cuts off the hardware enable of the underlying drive motor when it detects the interruption of the encrypted heartbeat token.

[0010] Furthermore, the holographic rendering engine 300 reduces the bit rate of far-field objects when the video memory exceeds the limit, and when it receives a zeroing signal triggered by the difference exceeding the limit, it ignores the illuminance drop data fed back by the photosensitive sensor and forcibly refuses to perform contrast brightening compensation based on ambient light occlusion.

[0011] Furthermore, the optomechanical servo execution subsystem 400 drives the lead screw to rise and fall according to a continuous S-shaped speed curve of acceleration, and when it detects that a tourist is entering the near field at high speed, it takes over the interpolation task and controls the lifting motor to smoothly decelerate and redirect to the near field final state position.

[0012] To achieve the above objectives, the present invention also provides a holographic projection interaction method based on visitor location awareness, applied to the aforementioned system, comprising the following steps: S1. Real-time acquisition of tourists' absolute spatial coordinates, straight-line viewing distance, and skeletal motion data; S2. Encapsulate the skeletal motion data into a spatiotemporal dynamic response vector and continuously evaluate the validity of the difference between adjacent time points; S3. When the difference is valid, generate a holographic video stream with wavefront depth-of-field parameters according to the straight-line sight distance constrained pixel computing power quota, drive the projection hardware to perform physical displacement in the vertical direction to align with the visitor's line of sight height, and synchronously drive the light source of the projection hardware to perform linear physical displacement along the optical path direction, so as to dynamically adjust the holographic reconstruction focal length; S4. When the difference exceeds the limit, the action instruction is intercepted and discarded at the software layer, the ambient light brightening compensation output is forcibly frozen at the rendering layer, and the enable signal of the drive motor is autonomously pulled down at the hardware link layer.

[0013] Further, the step S3 is progressively divided according to the magnitude of the straight-line sight distance D: a far-field latent stage when D>3.0 meters; a mid-field line-of-sight takeover stage when 1.5 meters<D≤3.0 meters; and a near-field micro co-creation stage when D≤1.5 meters.

[0014] Further, a sliding window speed gating step is built in the mid-field line-of-sight takeover stage. When it is determined through consecutive multiple frames that the instantaneous speed of the visitor is higher than the fast traversal threshold, the vertical displacement interpolation is forcibly interrupted and smoothly decelerated to redirect to the near-field target.

[0015] Further, the defense steps of step S4 include: constructing an inwardly retracted virtual safety boundary at the algorithm layer, determining a collision attempt when the skeleton point penetrates the boundary without decelerating, muting the action stream, forcibly setting the illumination compensation gain coefficient to zero and clearing the motor enable, so that the optical machine encountering physical occlusion presents visual negative feedback of natural shadow collapse.

[0016] Compared with the prior art, the beneficial effects of the present invention include: 1. The present invention uniquely anchors the visitor identity through the spatial intersection of computer vision and ultra-wideband velocity vectors, drives the transmission screw to vertically lift in combination with the S-shaped velocity curve with continuous acceleration, and adopts the mid-field speed gating redirection algorithm, thereby realizing imperceptible and accurate tracking of the visitor's line of sight of different heights by the projector position height and parallax distortion elimination, as well as flexible preemption and smooth deceleration of the displacement interpolation task for visitors walking fast, completely eliminating the mechanical impact caused by traditional electromechanical emergency stop.

[0017] 2. The present invention dynamically delimits the pixel resource budget according to the real-time throughput load of the graphics video memory, and cooperates with the far-field image bit rate degradation and near-field computing power exclusive locking mechanism based on the spatial straight-line sight distance, thereby realizing the accurate tilting and guarantee of computing power to the near-field main interactive image under the concurrent peak of multiple exhibition booths, achieving stable frame rate rendering of the core surface texture, and reducing the graphics video memory stutter rate in the high passenger flow concurrent scenario of cultural museums and galleries.

[0018] 3. This invention determines the penetration speed of action skeleton points by constructing an inwardly recessed virtual safety boundary at the algorithm layer, combined with a software layer silent action flow, an independent safety MCU watchdog to clear motor enable, and an Override mechanism that forcibly resets the illumination compensation gain coefficient to zero. This achieves accurate identification and joint circuit breaking of action boundaries for intense pointing and malicious physical collisions in open interactions. Furthermore, when encountering malicious physical occlusion, it utilizes the optical negative feedback of natural shadow collapse to achieve a balance between underlying electromechanical interlocking and visual flexible dissuasion. Attached Figure Description

[0019] Figure 1 This is a diagram illustrating the components of a holographic projection interactive display system based on visitor location awareness, provided by the present invention. Figure 2 This is a diagram showing the composition of a multi-granular spatiotemporal perception subsystem of a holographic projection interactive display system based on visitor location awareness provided by the present invention. Figure 3 This is a diagram showing the composition of the intent center and security subsystem of a holographic projection interactive display system based on visitor location awareness provided by the present invention; Figure 4 This is a diagram showing the composition of a holographic rendering engine for a holographic projection interactive display system based on visitor location awareness, provided by the present invention. Figure 5 This is a diagram of the optical engine servo subsystem of a holographic projection interactive display system based on visitor location awareness provided by the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Reference Figure 1 The present invention provides a holographic projection interactive display system based on visitor location awareness, comprising the following four subsystems: a multi-granular spatiotemporal awareness subsystem 100, an intent center and security subsystem 200, a holographic rendering engine 300, and an optical engine servo subsystem 400.

[0022] The multi-granular spatiotemporal perception subsystem 100 collects tourists' absolute spatial coordinates, straight-line viewing distance, skeletal motion flow, and multimodal emotional features in real time; the intention center and safety subsystem 200 decouples and maps legitimate action vectors into three-dimensional control primitives and sends them to the holographic rendering engine 300, and calculates the time difference of the action carrier in real time, and performs hardware and software dual locking for unexpected instantaneous high-frequency disturbances (such as malicious slapping or collision); the holographic rendering engine 300 dynamically constrains the pixel computing power quota according to the spatial viewing distance and generates a holographic video stream with light field depth information; the optomechanical servo subsystem 400 receives physical coordinate commands and focusing pulses, and drives the projection hardware to perform vertical height fine-tuning and optical wavefront focusing in real time.

[0023] Reference Figure 2 The multi-granularity spatiotemporal perception subsystem 100 includes: a global positioning module 110, a mid-near field vision module 120, an audio-visual acquisition module 130, and a spatiotemporal coordinate calculation unit 101, a skeleton pose estimation unit 102, and an emotion feature extraction unit 103 that are connected to it in communication.

[0024] The global positioning module 110 consists of an ultra-wideband (UWB) reference beacon network and an ultra-wideband active ranging terminal worn by visitors. The spatiotemporal coordinate calculation unit 101 uses the time difference of arrival (TDOA) positioning algorithm to calculate the absolute three-dimensional coordinates of a specific terminal ID in the global exhibition hall coordinate system in real time with an accuracy of 10 centimeters. Based on this, the physical straight-line sight distance between the visitor and the specific booth is determined. .

[0025] The mid-field vision module 120 is vertically mounted on the outer side of the holographic booth, facing the horizontal projection surface. It includes a 3D motion-sensing camera and an infrared depth camera. When visitors enter the mid-field... At the same time, the skeletal pose estimation unit 102, based on the target detection neural network to remove the background, accurately locates the three-dimensional spatial coordinates of the human root node (cervical spine point) and the fingertips and wrists, and calculates their instantaneous velocity vectors. .

[0026] To address the ambiguous mismatch issue between UWB coordinates and visual body images when surrounded by large crowds, this system incorporates a "spatiotemporal bounding box intersection and kinematic synchronization algorithm." The specific principle is as follows: the system uses an external calibration matrix... The visual coordinate system is mapped into the UWB global coordinate system in real time; within a 0.3-second sliding window, the system continuously compares the instantaneous velocity vector of a specific terminal. The instantaneous velocity vector of the kth human body captured visually If and only if the spatial Euclidean distance between the two is less than 25 cm and the cosine similarity of their velocity vectors is... At that time, the system determines that the visual skeleton stream has completed "unique identity anchoring" with the UWB terminal ID, and the visual data of other bystanders without terminals are directly marked as background noise and removed.

[0027] Reference Figure 3 The software layer of the intent center and safety subsystem 200 includes a vector construction module 201, an applicability evaluation module 202, a reference mapping module 203, and a compensation freeze module 204; the hardware layer includes a central control host 210, a safety isolation module 220 (with a built-in automotive-grade safety MCU 221), and a bidirectional isolation bus 230.

[0028] The vector construction module 201 encapsulates the continuously input skeletal keypoint sequence into a standardized spatiotemporal dynamic response vector. The applicability evaluation module 202 continuously calculates the absolute difference between vectors at adjacent time points. .

[0029] When absolute difference When the action flow is within the normal stable threshold S, it enters the reference mapping module 203. To eliminate the "control drift" caused by the large difference in hand size and slight spatial jitter in traditional gesture interaction, this invention introduces an adaptive reference dynamic zeroing mechanism: 1) When the camera captures the moment a tourist makes a "two-finger pinch" gesture, the system automatically records the absolute straight-line distance between the two fingers at that moment as the initial reference zero point. (That is, defined as the 0% deconstruction stretching point); 2) The actual displacement when the tourist pulls their hands outward. The system applies a viscous damping coefficient μ to the displacement to filter out minute hand tremors with frequencies higher than 5 Hz. 3) When the stretching ratio after damping and filtering exceeds the first-level preset threshold L1, the mapping module outputs a "magnetic trigger command" to drive the rendering engine to instantly deconstruct and adsorb the surface of the exhibit to the "inner cavity line structure layer". 4) Automatic Reference Reset: At the instant adsorption occurs, the mapping module automatically resets the current straight-line distance between the hands at the time of adsorption completion to a new reference zero point, i.e., ... Visitors can smoothly pull outwards from their current location without repeatedly rubbing their hands, steadily exploring deeper layers of the "internal inscription". 5) Timeout rollback mechanism: If a visitor completely releases the pinch gesture for more than 0.5 seconds during the exploration, the state machine triggers the "timeout release command", driving the rendered screen to automatically roll back to the previous display layer with an S-shaped gradient curve.

[0030] When a malicious user attempts to slap or ram the display stand, their action is characterized by "the hand bones shooting forward with extremely high initial velocity, showing no deceleration as they approach the glass surface"; at this moment, the absolute difference calculated by the applicability assessment module 202 instantly breaks through the stability threshold (i.e., Triggering circuit breaker interception: 1) Software layer silence: The host software directly discards the action package and does not send any rotation or deconstruction instructions to the lower level; 2) Highest-level compensation freeze: The compensation freeze module 204 sends an Override command to the rendering engine, forcing its ambient light secondary compensation coefficient to be frozen to zero; 3) Hardware-level enable interception: During normal communication, the central host must continuously send encrypted heartbeat tokens with dynamic timestamps to the security isolation module 220. Once the host software freezes due to excessive concurrency or determines that the interaction has seriously exceeded the limit, causing the heartbeat token to be interrupted for more than 20 milliseconds, the internal hardware watchdog of the security MCU221, which is independently deployed on the hardware board, overflows instantly, forcibly pulling the hardware enable pins connected to all servo motor controllers low to zero level (i.e., making EN=0), instantly locking the transmission screw and stepper gear at the physical link layer, completely eliminating mechanical vibration.

[0031] Reference Figure 4 The holographic rendering engine 300 includes an environment perception module 310 (composed of an external photoresistor and an infrared photoelectric array), a graphics rendering cluster 320, a multi-view stitching module 301, a texture scaling module 302, a computing power constraint module 303, and a light environment correction module 304.

[0032] When concurrent interaction across multiple booths causes a shortage of video memory, the computing power constraint module 303 calculates the real-time pixel budget based on the current throughput load of the video memory. Subsequently, the importance of all objects in the hall was ranked according to their straight-line viewing distance D: for exhibits in the far-field lurking area (i.e., D>3.0m), low-poly degradation and low bitrate texture mapping were enforced; the core memory bandwidth was locked only on the main interactive objects with a straight-line distance D≤1.5m to ensure high frame rate rendering of ultra-high-definition surface texture.

[0033] Under normal conditions, the ambient light correction module 304 adjusts the ambient light level based on the feedback from the photoresistor. The number of onlookers, N, is calculated using the formula... The system dynamically increases the luminance and secondary contrast of the holographic image to prevent the image from appearing washed out. However, when the system is maliciously struck and the security circuit breaker is triggered: although the vandal's close proximity to the booth causes a sharp drop in the photoresistor reading (manifested as severe obstruction of ambient light), the correction module 304 receives a "compensation freeze override signal" from the firewall, forcibly reducing its gain coefficients α and β to zero. The system explicitly refuses to output any brightening compensation, and the malicious user can only see a fragmented image through the glass, which is darkened over a large area due to its own physical obstruction and the collapse of natural shadows. This uses optical negative feedback to achieve a "soft deterrent."

[0034] See Figure 5 The optomechanical servo subsystem 400 includes a trajectory planning module 401 for generating continuous S-shaped smooth motion pulses with acceleration; a verification and redirection module 402 for providing limit safety protection when redirection is interrupted; a wavefront depth mapping module 403 for calculating physical focusing pulse parameters; a vertical lifting execution module 410, which uses a lead screw servo mechanism, for driving the projection hardware to align with the viewer's line of sight; a wavefront focusing execution module 420, which uses a stepper gear mechanism, for changing the physical linear distance of the projection light source; and a holographic imaging module 430, which uses a light field holographic medium, for the final physical optical representation of wavefront interference.

[0035] The trajectory planning module 401 and the verification and redirection module 402 communicate and drive the vertical lifting execution module 410. Under normal conditions, when the perception subsystem calculates the target height of the tourists' line of sight, the trajectory planning module 401 converts the height difference into a continuous acceleration (S-shaped velocity curve) control pulse, which drives the screw servo mechanism of the vertical lifting execution module 410 to operate smoothly, so that the projection hardware is accurately vertically lifted and lowered to the front of the tourists' eyes.

[0036] If, during this interpolation process, the system triggers redirection control for tourists walking across quickly, the verification redirection module 402 instantly takes over control and verifies in real time whether the coordinates of the new target endpoint have exceeded the physical extreme limit switch. After determining that the endpoint is valid, the operating vertical lifting execution module 410 is forced to decelerate to zero with a smooth slope controlled by acceleration, and a new S-shaped acceleration and deceleration trajectory is planned to reach the near-field final state, thereby driving the holographic imaging module 430 to the optimal presentation position without mechanical impact.

[0037] The wavefront depth mapping module 403 communicates with and drives the wavefront focusing execution module 420. When a visitor uses gestures in the near field to cause a deep deconstruction and magnification of the digital exhibit, resulting in a sudden change in the virtual imaging depth output by the rendering engine, the wavefront depth mapping module 403 simultaneously converts the digital depth variable ΔZ into focusing pulse parameters and sends them to the wavefront focusing execution module 420. The stepping gear mechanism of the wavefront focusing execution module 420 then operates, precisely pushing and pulling the projection light source within the horizontal physical optical path channel, changing the absolute physical straight-line distance Δd between the light source and the holographic imaging module 430 in real time. According to the wavefront reconstruction interference equation of the light field, this mechanical displacement compensates for the optical reconstruction focal length of the wavefront in real time, so that the imaging points of the magnified internal cavity structure of the exhibit are precisely converged on the optimal optical surface plane of the holographic imaging module 430, realizing the depth-of-field engagement of the pure physical optical path.

[0038] In conjunction with the above system components, this invention also provides a holographic projection interaction method based on visitor location awareness, which is progressively divided into five stages according to spatial viewing distance: Stage Zero (Standby): When line of sight is zero When the exhibition hall is unoccupied, the system periodically performs environmental noise calibration and UWB reference network clock synchronization, and the projection hardware outputs low-power breathing particle light effects (such as holographic hourglass) to the imaging medium to maintain the self-check of optical engine temperature rise and the atmosphere of the booth tour.

[0039] Phase 1: When At that time, the UWB network calculates the absolute coordinates of the visitors and confirms their approach intentions; the rendering engine lowers the texture bitrate of the booth and dynamically releases and allocates the video memory computing power to other booths that are at the peak of interaction.

[0040] Phase Two: When At that time, the visual depth camera is activated and completes identity anchoring with the UWB tag stream; the speed gating mechanism calculates the tourist's walking speed: if the approach is gentle, the lifting screw descends flexibly in an S-shaped curve to match the tourist's line of sight, and the image quality is smoothly improved; if the tourist passes through at high speed, a preemptive interpolation interruption is triggered, and the electromechanical system smoothly decelerates and redirects to the near-field final state.

[0041] Phase Three: When When the multimodal array is fully powered on, the image quality and details are fully revealed. When visitors make a "pinch-pull" gesture, the system, based on an adaptive zero-point establishment mechanism and viscous damping to filter hand shake, drives the hierarchical deconstruction of the exhibits and produces a magnetic sense of segmentation. Simultaneously, the wavefront focusing gear group pushes and pulls the physical distance of the light source to ensure that the depth of field is always in focus. During this time, in conjunction with facial micro-expressions or voice commands, a holographic subtitle pop-up window is triggered.

[0042] Phase Four: At any point in Phases One through Three, the system background continuously calculates the instantaneous velocity of the skeletal ray. Once a malicious physical impact action that penetrates the virtual security boundary at high speed is detected, the system ignores the normal illuminance drop logic, forcibly freezes the ambient light compensation and silences the action command. The security MCU watchdog autonomously lowers the motor enable and locks the optical engine. The optical shadow collapse of "no supplementary light, no drive" forms negative feedback to achieve the deterrent effect.

[0043] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A holographic projection interactive display system based on visitor location awareness, characterized in that, include: A multi-granular spatiotemporal perception subsystem (100) is used to collect tourists' absolute spatial coordinates, straight line distance, and skeletal motion data in real time. The intent center and safety barrier subsystem (200) is communicatively connected to the multi-granularity spatiotemporal perception subsystem (100), and is used to encapsulate the skeletal motion data into a spatiotemporal dynamic response vector and continuously evaluate the legality of the difference between adjacent time moments. When the difference is legal, it outputs a view deconstruction instruction and a physical target displacement signal, and triggers a safety interception signal when the difference exceeds the limit. A holographic rendering engine (300) is communicatively connected to the intent center and the security barrier subsystem (200) for dynamically constraining pixel computing power quotas according to the line-of-sight distance and outputting a holographic video stream with wavefront depth parameters based on the view deconstruction instructions. The optomechanical servo execution subsystem (400) is communicatively connected to the intention center and safety barrier subsystem (200) and the holographic rendering engine (300). It is used to receive the physical target displacement signal to drive the projection hardware to perform vertical physical displacement to align with the visitor's line of sight height, and to drive the light source of the projection hardware to perform mechanical linear displacement along the optical path axis according to the wavefront depth parameters, so as to dynamically adjust the physical reconstruction focal length of the holographic wavefront interference.

2. The holographic projection interactive display system based on visitor location awareness according to claim 1, characterized in that, The multi-granularity spatiotemporal sensing subsystem (100) includes: The global positioning module (110) uses ultra-wideband wireless pulse ranging technology to calculate the absolute spatial coordinates of the tourist in real time; The mid-near field vision module (120) uses depth imaging technology to extract the coordinates of the root node of the human body, key points of the skeleton and instantaneous velocity vector of the movement of tourists; The multi-granularity spatiotemporal perception subsystem (100) uniquely binds the captured skeletal motion data to a specific tourist identity by calculating the spatial Euclidean distance and cosine similarity between the velocity vector output by the global positioning module (110) and the instantaneous velocity vector output by the mid-near field vision module (120) within the same time window.

3. A holographic projection interactive display system based on visitor location awareness according to claim 1 or 2, characterized in that, The intent center and safety barrier subsystem (200) includes an adaptive reference mapping module (203) for recording the current spatial straight-line distance between the two fingers as the initial reference zero point at the moment when the tourist's two-finger pinching action is intercepted; Apply a viscous damping filter to the actual displacement caused by the tourist's hands pulling outwards; When the filtered stretching ratio exceeds the preset level threshold, the output is the view deconstruction instruction that peels the digital exhibit outward, and at the moment of visual adsorption, the current distance between the hands when adsorption is completed is automatically reset to the new reference zero point.

4. The holographic projection interactive display system based on visitor location awareness according to claim 3, characterized in that, The intent center and security barrier subsystem (200) includes a security isolation module (220) and a compensation freeze module (204). When the absolute difference between adjacent moments of the spatiotemporal dynamic response vector breaks through the stability threshold, or the action ray penetrates the preset virtual security boundary, the compensation freeze module (204) outputs a forced zero signal to the holographic rendering engine (300). The security isolation module (220) has a built-in independent security microcontroller, which is used to autonomously cut off the hardware enable of the underlying drive motor when the encrypted heartbeat signal of the control host is detected to have timed out.

5. The holographic projection interactive display system based on visitor location awareness according to claim 4, characterized in that, The holographic rendering engine (300) includes: a computing power constraint module (303) for descending the rendering bitrate of objects whose line-of-sight distance is greater than a preset latency threshold when the graphics memory load exceeds the limit, and locking the core memory bandwidth to the near-field main interactive object; and an ambient light correction module (304) for ignoring the illuminance drop data fed back by the external photosensitive sensor and forcibly refusing to perform contrast brightening compensation based on ambient light occlusion when the forced zeroing signal is received.

6. The holographic projection interactive display system based on visitor location awareness according to claim 5, characterized in that, The optomechanical servo execution subsystem (400) includes: a trajectory planning module (401), used to convert the line-of-sight height difference into a continuous S-shaped velocity curve, driving the lead screw lifting mechanism to vertically translate the projection hardware; a verification and redirection module (402), used to preempt the current interpolation task and control the lifting motor to smoothly decelerate to zero at a controlled slope when a tourist is detected to enter the near field at a speed higher than a set threshold, and replan a new S-shaped trajectory to the near field final position; and a wavefront focusing execution module (420), which uses a stepper gear set to push and pull the projection light source along the horizontal physical axis to change the linear physical distance between the light source and the suspended holographic imaging unit in real time.

7. A holographic projection interaction method based on visitor location awareness, applied to the system as described in claim 1, characterized in that, Includes the following steps: S1. Real-time acquisition of tourists' absolute spatial coordinates, straight-line viewing distance, and skeletal motion data; S2. Encapsulate the skeletal motion data into a spatiotemporal dynamic response vector and continuously evaluate the validity of the difference between adjacent time points; S3. When the difference is valid, a holographic video stream with wavefront depth parameters is generated according to the linear viewing distance constraint pixel computing power quota, and the projection hardware is driven to perform a physical displacement in the vertical direction to align with the height of the tourist's line of sight, and the light source of the projection hardware is simultaneously driven to perform a linear physical displacement along the optical path direction to dynamically adjust the holographic reconstruction focal length. S4. When the difference exceeds the limit, the action command is intercepted and discarded at the software layer, the ambient light brightening compensation output is forcibly frozen at the rendering layer, and the enable signal of the drive motor is automatically pulled low at the hardware link layer.

8. A holographic projection interaction method based on visitor location awareness according to claim 7, characterized in that, Step S3 is divided into the following based on the magnitude of the straight line distance: In the far-field latency stage, when the straight-line viewing distance is greater than the first threshold, the pixel computing power quota is constrained to reduce the texture bitrate and multi-view stitching level of the target image. During the mid-field line-of-sight takeover phase, when the straight-line viewing distance is between the first threshold and the second threshold, the projection hardware is driven to perform a vertical physical displacement, and the projection hardware is lowered according to an S-shaped speed curve to align with the tourist's line of sight. In the near-field micro-co-creation stage, when the linear viewing distance is less than or equal to the second threshold, the projection hardware performs a linear physical displacement along the optical path direction, and responds to the visitor's pinching and pulling gestures to synchronously push and pull the light source to dynamically adjust the holographic reconstruction focal length.

9. A holographic projection interaction method based on visitor location awareness according to claim 8, characterized in that, During the mid-field line-of-sight takeover phase, the execution of the vertical physical displacement includes the following interruption steps: First, the instantaneous velocity vector of the visitor approaching the booth is calculated; if the instantaneous velocity is higher than the set rapid crossing threshold, the current vertical displacement is forcibly interrupted, the lifting motor is controlled to smoothly decelerate to zero at a controlled slope, and the endpoint of the physical displacement is redirected to the near-field target position.

10. The holographic projection interaction method based on visitor location awareness according to claim 7, characterized in that, The difference exceeding the limit determination step in step S4 includes: First, constructing an inwardly recessed virtual safety boundary at the algorithm layer; when it is detected that the motion skeleton point does not decelerate and penetrates the virtual safety boundary, it is determined to be a collision attempt and the difference exceeds the limit; then, intercepting and discarding the motion command at the software layer, while forcibly setting the ambient light compensation gain coefficient to zero at the rendering layer, and clearing the enable signal of the drive motor by the underlying watchdog at the hardware link layer, so that the optical engine encountering physical occlusion presents a visual negative feedback of natural shadow collapse.

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