HMD Safety Tracking Using Depth Sensors
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Solution Overview
Problem
Users of head-mounted displays (HMDs) are at risk of injury due to their limited field of view, which can cause them to collide with tangible obstacles, and existing technologies fail to effectively warn users when they move outside the camera's field of view or approach obstacles.
Innovation Solution
Implementing a system that uses image and depth sensors to track the user's movements and provide warnings through audio, visual, or haptic signals when the user approaches the edge of the scene or tangible obstacles, adjusting the content displayed on the HMD to ensure the user's safety by moving the display away from their eyes or rendering real-world objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If head-mounted displays are used to provide immersive virtual reality experiences, then user engagement and interaction with virtual content are improved, but users become vulnerable to injuries from collisions with tangible obstacles
Solution Approach 1:
The system performs preliminary tracking of the user's position and movement within the play area before a collision can occur. By continuously monitoring the user's location relative to obstacle boundaries and predicting their trajectory, the system can issue advance warnings or automatically adjust the virtual display to alert the user to potential collision risks before they actually collide with obstacles.
Solution Approach 2:
The system implements real-time feedback by tracking the user's movements through cameras and depth sensors, continuously updating the virtual reality display to reflect the user's position and surrounding environment. This feedback loop allows the system to detect when the user approaches obstacle boundaries or moves outside the safe play area, and immediately provide corrective feedback through visual, auditory, or haptic warnings to prevent collisions.
2Adaptability or versatility
If the field of view of head-mounted displays is limited to focus on virtual content, then virtual reality immersion is enhanced, but users' awareness of their surroundings is reduced
Solution Approach 1:
The system introduces an intermediary layer between the user and the virtual reality content in the form of safety monitoring and warning mechanisms. Cameras and depth sensors act as intermediaries to capture real-world environmental data, while safety algorithms process this information and translate it into appropriate warnings or display adjustments that inform users of their surroundings without completely breaking the immersive virtual reality experience.
Solution Approach 2:
The system dynamically adjusts the balance between virtual reality immersion and safety awareness based on the user's behavior and environment. When the user is stationary or moving safely within boundaries, the system maintains full virtual reality immersion. When the user approaches obstacle boundaries or exhibits unsafe behavior patterns, the system dynamically introduces safety warnings or temporarily adjusts the virtual display to prioritize safety information, creating a dynamic equilibrium between immersion and awareness.
3Object-affected harmful factors
If warning systems are implemented to alert users of potential collisions, then user safety is improved, but system complexity increases
Solution Approach 1:
The system employs multi-functional components that serve both virtual reality delivery and safety monitoring purposes. The same cameras and depth sensors used for tracking user position and gestures for virtual interaction also serve as the primary detection mechanism for safety monitoring. The processing algorithms handle both virtual reality rendering tasks and safety analysis, reducing the need for separate dedicated safety hardware and minimizing overall system complexity while maintaining comprehensive safety coverage.
Data Source
AI summary
Methods and systems for warning a user of a head mounted display (HMD) during game play of a video game. A game is executed causing interactive scenes of the game to be transmitted for rendering on a display portion of the HMD. Coordinates of the HMD are determined in a three-dimensional space of a real-world environment in which the user wearing the HMD is present, to identify a current position of the user. A movement of the HMD is determined during execution of the game by identifying a change in one or more coordinates of the HMD in the three-dimensional space. When it is determined that the user is approaching a boundary of an interaction space in a real-world environment, a warning signal is conveyed to the HMD to indicate proximity of the user to the boundary of the interaction space.