Stereoscopic Display System Using Phase-Shifted Viewpoint Images
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Solution Overview
Problem
Conventional stereoscopic image display systems using linear blending suffer from image quality deterioration due to large diffusion characteristics of the screen, where unintended projector images are perceived by the observer, leading to a decrease in image quality when fewer projectors are used.
Innovation Solution
A stereoscopic image display system employing a configuration where multiple projectors are arranged side by side with predetermined spacing, projecting viewpoint images onto a screen with a narrow diffusion angle, utilizing an image holding unit to generate and project first and second viewpoint images with phase-shifted pattern information, ensuring that only adjacent images closest in the line-of-sight direction are superimposed at specific luminance ratios, thereby reducing image quality deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a small number of projectors are used with linear blending, then device complexity is reduced, but image quality deteriorates due to unintended projector images being perceived
Solution Approach 1:
The patent segments the image projection by adding pattern information (such as halftone patterns or error diffusion patterns) to viewpoint images from different projectors. This segmentation allows the human visual system to separate intended images from unintended ones through spatial frequency analysis, enabling quality stereoscopic viewing with fewer projectors
Solution Approach 2:
The patent applies different pattern information to different regions or layers of the image. Specifically, alternating viewpoint images receive different pattern types (e.g., even patterns vs. odd patterns), creating local quality differences that help the observer distinguish between images from different projectors while maintaining overall image coherence
2Illumination intensity
If screen diffusion characteristic is increased, then light distribution is improved, but image quality deteriorates due to unintended projector images being perceived
Solution Approach 1:
The patent converts the harmful effect of screen diffusion (which causes unintended projector images to be visible) into a beneficial effect by using pattern information. The diffusion spreads light from all projectors across the screen, but the pattern information embedded in each projector's output allows the observer's visual system to separate the intended image from unintended ones through spatial frequency analysis
Data Source
AI summary
A stereoscopic image display system includes: a plurality of projectors arranged side by side with predetermined spacing and project respectively viewpoint images for installation positions in the same direction, the viewpoint images being related to the same object; a screen displaying a superimposed image for the object, based on two adjacent images, among the projected images, that are the closest from a line-of-sight direction of an observer; and an image holding unit holding information about a first viewpoint image to which pattern information for shifting a phase corresponding to a predetermined period is added and information about a second viewpoint image from which the pattern information is subtracted, which are generated from each of a plurality of base images as the viewpoint images to be respectively projected by the plurality of projectors. Each projector projects the first and second viewpoint images related to preceding and succeeding stages onto the screen.