Head-Mounted Display Image Distortion Control via Dynamic Projection
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Solution Overview
Problem
Head-mounted displays used for viewing stereoscopic images face challenges in suppressing motion parallax and image distortion when the user's head moves, leading to VR sickness and image distortion issues.
Innovation Solution
A reproduction device and method that projects images captured from specific positions in real space onto a virtual space, adjusting relative distances based on head movement, with a smaller change in the horizontal direction than in the vertical direction to minimize image distortion and VR sickness, using an image processing unit that acquires head movement and adjusts relative distances accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the user's head moves while viewing a stereoscopic image on a head-mounted display, then the sense of immersion is enhanced, but motion parallax and image distortion occur causing VR sickness
Solution Approach 1:
The patent applies dynamics by making the projection surface movable relative to the user's head position. The projection surface is moved in the first direction (left-right or up-down) based on head movement detected by the sensor, allowing the system to adapt dynamically to user motion while maintaining image quality and reducing motion parallax effects
Solution Approach 2:
The patent changes the position parameter of the projection surface according to head movement amount. By adjusting the projection surface position in the first direction based on detected head movement, the system modifies the spatial parameters to compensate for motion parallax and maintain immersive experience without distortion
2Manufacturing precision
If the projection surface is fixed in virtual space, then image distortion is minimized, but head movement causes motion parallax and VR sickness
Solution Approach 1:
The system transitions from a fixed projection surface to a dynamic one that moves with head position. The projection surface is moved in the first direction corresponding to head movement direction, creating a dynamic adaptation that reduces motion parallax while maintaining image quality
Solution Approach 2:
The patent implements feedback by detecting head movement amount using a sensor and using this information to control the projection surface position. The feedback loop ensures that the projection surface adjusts in response to actual head movement, compensating for motion parallax effects
3Object-affected harmful factors
If the projection surface moves in the first direction to reduce motion parallax, then VR sickness is suppressed, but image distortion may increase
Solution Approach 1:
The patent applies local quality by moving the projection surface specifically in the first direction (left-right or up-down) based on head movement detection, while maintaining the second direction (front-back) position for depth perception. This directional-specific adjustment reduces motion parallax in horizontal/vertical planes while preserving depth-related image quality
Solution Approach 2:
The dynamic movement of the projection surface in the first direction allows the system to adapt to head movement while maintaining image distortion control. The projection surface position is adjusted dynamically but selectively, affecting only the dimensions where motion parallax occurs
Data Source
AI summary
The present technology relates to a reproduction device, a reproduction method, and a recording medium capable of suppressing influence of motion parallax and image distortion. There is provided a reproduction device including an image processing unit that performs processing including: projecting an image captured from a specific position in a real space on a projection surface arranged according to a reference position set in a virtual space; acquiring a head movement amount of a user viewing the projected image; changing, according to the head movement amount with respect to the reference position in a first direction that is at least one of a left-right direction or an up-down direction as viewed from the user, a first relative distance between the reference position and a user position in the first direction; changing, according to the head movement amount with respect to the reference position.