Enhancing multi-view autostereoscopic displays by viewing distance control (VDC)
2014
Conventional multi-view displays spatially interlace various views of a 3D scene and form appropriate viewing channels.
However, they only support sufficient stereo quality within a limited range around the nominal viewing distance (NVD).
If this distance is maintained, two slightly divergent views are projected to the person’s eyes, both covering the entire
screen. With increasing deviations from the NVD the stereo image quality decreases. As a major drawback in usability,
the manufacturer so far assigns this distance.
We propose a software-based solution that corrects false view assignments depending on the distance of the viewer. Our
novel approach enables continuous view adaptation based on the calculation of intermediate views and a column-bycolumn
rendering method. The algorithm controls each individual subpixel and generates a new interleaving pattern from
selected views. In addition, we use color-coded test content to verify its efficacy.
This novel technology helps shifting the physically determined NVD to a user-defined distance thereby supporting
stereopsis. The recent viewing positions can fall in front or behind the NVD of the original setup. Our algorithm can be
applied to all multi-view autostereoscopic displays — independent of the ascent or the periodicity of the optical element.
In general, the viewing distance can be corrected with a factor of more than 2.5.
By creating a continuous viewing area the visualized 3D content is suitable even for persons with largely divergent
intraocular distance — adults and children alike — without any deficiency in spatial perception.
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