Dome Projection System Using Rotating Projector Shafts
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Solution Overview
Problem
Current image projection systems in planetariums face challenges in creating natural object movement on a dome surface without increasing projector resolution, leading to high costs and unnatural image representation due to discrete pixel movement and the need for anti-aliasing.
Innovation Solution
An image projection system using multiple video projectors mounted on rotating shafts within a dome, allowing for full-sphere projection and enabling motion representation through shaft rotation rather than image changes, combined with an optical planetarium projector for precise alignment and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If anti-aliasing is performed on images to avoid unnatural movement, then image quality is improved, but computing cost increases
Solution Approach 1:
The patent replaces the computational anti-aliasing system with a mechanical projection system. By mounting video projectors on rotating shafts that can physically move and rotate, the system achieves smooth object movement through mechanical motion rather than computational image processing. This substitution eliminates the need for complex anti-aliasing calculations while maintaining image quality.
Solution Approach 2:
The patent introduces dynamic movement of the projection system itself through rotating shafts, allowing the projectors to physically move to different positions and angles. This dynamic mechanical approach replaces static image processing with dynamic physical movement, achieving natural motion representation without increasing computational complexity.
2Manufacturing precision
If resolution is increased to achieve equivalent dome screen resolution, then image quality is improved, but device cost increases
Solution Approach 1:
The patent moves from a two-dimensional image processing approach to a three-dimensional spatial approach. Instead of increasing pixel resolution on a fixed projector, the system uses rotating shafts to move projectors in three-dimensional space, covering the dome surface from multiple positions and angles. This dimensional change allows standard-resolution projectors to achieve high effective resolution across the dome.
Solution Approach 2:
The patent divides the dome projection task among multiple video projectors mounted on rotating shafts. Each projector covers a specific region at a specific time, and the system segments the overall projection task into multiple spatial and temporal segments. This segmentation allows the use of lower-resolution individual projectors to achieve high overall resolution across the dome surface.
3Area of stationary object
If multiple video projectors are used to cover the dome surface, then projection coverage is improved, but image alignment and distortion correction become more difficult
Solution Approach 1:
The patent incorporates feedback mechanisms to detect and correct projection alignment and distortion. By monitoring the actual positions and orientations of the rotating shafts and the resulting projection images, the system can dynamically adjust parameters to maintain proper alignment and minimize distortion across the dome surface.
Solution Approach 2:
The patent uses parameter changes in the rotating shaft positions and angles to dynamically adjust projection coverage and alignment. By changing the spatial parameters of the projector positions through controlled rotation, the system optimizes image alignment and reduces distortion without requiring complex post-processing.
Data Source
AI summary
The present invention implements the movement of an object in an image projected onto a dome-shaped screen while maintaining an original resolution without increasing the resolution of a video projector as a projection device. In a device for projecting an image onto the dome-shaped screen D, an aggregate of two or more video projectors 1A, 1B for projecting a moving image is disposed in a dome such that the range of projection from the aggregate covers the whole sphere, and the aggregate is mounted on a stand 2 having two or more rotating shafts.