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Proceedings Paper

Single shot plenoptic optical imaging inspection of a head-up display: projection distance, astigmatism, field curvature, and distortions
Author(s): Moisés A. S. Duarte; Eduardo J. Nunes-Pereira; Boris P. J. Bret; Paulo M. F. Forté; Flávio P. Ferreira; Marco A. Sousa; José M. González-Méijome
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Paper Abstract

A single shot automatic optical inspection system for evaluating the projection distance, astigmatism, field curvature and geometric distortions of a virtual image created by a Head-Up Display (HUD) prototype is presented. The system uses plenoptic or light-field imaging. Although results are only presented for a Augmented Reality (AR)/Mixed Reality (MR) HUD application, the inspection workflow is also applicable to a plurality of other optical systems for AR, MR, and Virtual Reality (VR) applications. The evaluation of the quality of a latent image (in most cases a virtual image) is necessary in all these systems, both for product development as well as for end-of-line production quality control. Therefore the results here presented should have an appeal for a broad readership.

For the HUD virtual image, the projected distance distribution functions are presented, for two selected patches in the FOV (Area 1 and 2). These are well described by Gaussians. As representative values, we obtained a mean projected distance of 0.15 ± 0.02 (horizontal details) and 0.03 ± 0.02 (vertical) Diopters, for Area 1, and 0.33 ± 0.04 (horizontal) and 0.03 ± 0.02 (vertical) Diopters, for Area 2. The estimated astigmatism is 0.12 and 0.30 Diopters, for Areas 1 and 2, respectively. When expressed in meters, the projected distances are 7 1 (horizontal) and 28 9 (vertical), for Area 1, and 3.1 ± 0.4 (horizontal) and 30 ± 10 (vertical), for Area 2. The estimated astigmatic difference is 21 and 23 meters, for Areas 1 and 2, respectively.

Paper Details

Date Published: 3 October 2019
PDF: 18 pages
Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 1120730 (3 October 2019); doi: 10.1117/12.2530964
Show Author Affiliations
Moisés A. S. Duarte, Bosch Car Multimedia Portugal SA (Portugal)
Eduardo J. Nunes-Pereira, Univ. do Minho (Portugal)
Boris P. J. Bret, Univ. do Minho (Portugal)
Paulo M. F. Forté, Bosch Car Multimedia Portugal SA (Portugal)
Flávio P. Ferreira, Univ. do Minho (Portugal)
Marco A. Sousa, Univ. do Minho (Portugal)
José M. González-Méijome, Univ. do Minho (Portugal)

Published in SPIE Proceedings Vol. 11207:
Fourth International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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