Artifact reduction in lenticular multiscopic 3D displays by means of anti-alias filtering

Janusz Konrad; Philippe Agniel

doi:10.1117/12.474153

30 May 2003 Artifact reduction in lenticular multiscopic 3D displays by means of anti-alias filtering

Janusz Konrad, Philippe Agniel

Proceedings Volume 5006, Stereoscopic Displays and Virtual Reality Systems X; (2003) https://doi.org/10.1117/12.474153
Event: Electronic Imaging 2003, 2003, Santa Clara, CA, United States

Abstract

This paper addresses the issue of artifact visibility in automultiscopic 3-D lenticular displays. A straightforward extension of the two-view lenticular autostereoscopic principle to M views results in an M-fold loss of horizontal resolution due to the subsampling needed to properly multiplex the views. In order to circumvent the imbalance between the horizontal and vertical resolution, a tilt can be applied to the lenticules to orient them at a small angle to the vertical direction, as is done in the SynthaGram display from Stereographics Corp. In either case, to avoid aliasing the subsampling should be preceded by suitable lowpass pre-filtering. Although for purely vertical lenticules a sufficiently narrowband lowpass horizontal filtering suffices, the situation is more complicated for diagonal lenticules; the subsampling of each view is no more orthogonal, and more complex sampling models need to be considered. Based on multidimensional sampling theory, we have studied multiview sampling models based on lattices. These models approximate pixel positions on a lenticular automultiscopic display and lead to optimal anti-alias filters. In this paper, we report results for a separable approximation to non-separable 2-D anti-alias filters based on the assumption that the lenticule slant is small. We have carried out experiments on a variety of images, and different filter bandwidths. We have observed that the theoretically-optimal bandwidth is too restrictive; aliasing artifacts disappear, but some image details are lost as well. Somewhat wider bandwidths result in images with almost no aliasing and largely preserved detail. For subjectively-optimized filters, the improvements, although localized, are clear and enhance the 3-D viewing experience.

Citation Download Citation

Janusz Konrad and Philippe Agniel "Artifact reduction in lenticular multiscopic 3D displays by means of anti-alias filtering", Proc. SPIE 5006, Stereoscopic Displays and Virtual Reality Systems X, (30 May 2003); https://doi.org/10.1117/12.474153

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