Stereoscopic Display Viewpoint Tracking Without Oblique Viewing
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Solution Overview
Problem
Conventional stereoscopic displays using motion parallax fail to provide a natural stereoscopic effect due to oblique viewing when the user's viewpoint moves, limiting the perception of depth and realism.
Innovation Solution
A stereoscopic image display device incorporating a display device with a camera to detect the user's viewpoint, a rotation mechanism, and an information processing unit to control the display to maintain a fixed world coordinate system, ensuring the displayed three-dimensional object appears stable despite device rotation, and adjusting the image to match the user's changing viewpoint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display device rotates to follow the user's viewpoint movement, then motion parallax is enhanced and stereoscopic depth perception is improved, but the viewing angle becomes oblique and the stereoscopic effect becomes unnatural
Solution Approach 1:
Instead of rotating the display to follow the viewpoint (conventional approach), the patent inverts the approach by keeping the display fixed and rotating the camera to track the viewpoint. This inversion resolves the contradiction by maintaining a consistent display orientation while still capturing motion parallax information through camera rotation, thereby preserving natural stereoscopic effects while enhancing depth perception
Solution Approach 2:
The patent introduces an intermediary coordinate system transformation mechanism that maps the rotated camera viewpoint to the fixed display coordinate system. This intermediary transformation allows the system to utilize motion parallax from camera rotation while presenting stable, non-oblique images on the display, thus resolving the contradiction between enhancing depth perception and maintaining natural stereoscopic effects
2Adaptability or versatility
If the display device rotates around a rotation axis to track viewpoint movement, then motion parallax information is captured, but the object position changes relative to the screen and stability is lost
Solution Approach 1:
The patent inverts the conventional approach by keeping the display and object positions fixed while rotating only the camera to track viewpoint movement. This inversion allows the system to adapt to changing viewpoints through camera rotation while maintaining stable object composition on the display, thereby resolving the contradiction between viewpoint tracking adaptability and object position stability
Solution Approach 2:
The patent separates the viewpoint tracking function into a different dimension by using camera rotation in the spatial domain while maintaining display stability in the presentation domain. This dimensional separation allows independent optimization of both viewpoint tracking capability and object position stability, resolving the contradiction between these two requirements
Data Source
AI summary
A stereoscopic image display device includes a display device, a camera that detects the position of the user's viewpoint looking at this display device, and a rotation device that rotates the display device around a rotation axis passing through its display surface. This rotation device rotates the display device in synchronization with the movement of the user's viewpoint position so that the direction of the user's viewpoint as seen from the display surface does not change. A three-dimensional object defined in a world coordinate system that remains stationary relative to the real world is displayed on the display device, and when the user's viewpoint moves, an image of the object as seen from the direction of the user's viewpoint is displayed on the display device.