HMD Field of View Transition via Transitional Images
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Solution Overview
Problem
Virtual reality users often experience visually induced motion sickness when immersed in virtual spaces provided by head-mounted displays (HMDs) due to mismatched movements between the user's head and the virtual camera, leading to visually induced motion sickness (VR sickness).
Innovation Solution
A virtual space providing method that includes generating a visual field image and a transitional image for HMDs, where the transitional image is updated with reduced information during unsynchronized movements of the virtual camera, and the virtual camera is moved at high speeds or within specific ranges to minimize the recognition of excessive visual field changes, thereby reducing the risk of VR sickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the virtual camera moves at high speed or changes the visual field significantly, then the field of view is updated efficiently, but visually induced motion sickness increases
Solution Approach 1:
The patent applies periodic action by alternately updating the visual field image in synchronization with head movements and updating it without synchronization at high speeds. This periodic switching between synchronized and unsynchronized updates allows the system to efficiently change the field of view while minimizing motion sickness through transitional images with reduced information
Solution Approach 2:
The patent implements beforehand cushioning by generating transitional images with reduced information amount before and during unsynchronized virtual camera movements. These transitional images act as a visual cushion that prepares the user's visual system for upcoming field of view changes, reducing the shock and discomfort associated with rapid visual transitions
2Ease of operation
If the visual field image is updated in synchronization with head movements, then user comfort is maintained, but the field of view cannot change rapidly
Solution Approach 1:
The patent applies dynamics by making the visual field update mode flexible and adaptive. The system dynamically switches between synchronized updating (for comfort during normal viewing) and unsynchronized high-speed updating (for rapid field of view changes), with the transition mode selected based on the current operational context and head movement characteristics
3Object-affected harmful factors
If transitional images with reduced information are used, then motion sickness is reduced, but visual quality decreases
Solution Approach 1:
The patent applies local quality by selectively applying reduced information only to transitional images during unsynchronized updates, while maintaining full visual quality in synchronized images. This localized application of quality reduction ensures that motion sickness is minimized during critical transition periods without permanently degrading the overall visual experience
Data Source
AI summary
A method includes generating a visual field image to be visually recognized by a user within a virtual space image, the virtual space image forming a virtual space within which the user is immersed. The method also includes generating a transitional image to be visually recognized by the user during a transitional period, the visual field image being updated during the transitional period. The method further includes displaying the visual field image and the transitional image using a head mounted display. Generating the transitional image includes one or more of updating the visual field image in synchronization with a movement of the head mounted display; or updating the visual field image without synchronization with the movement of the head mounted display by generating a transitional image having a reduced information amount to be visually recognized by the user.