Single shot plenoptic optical imaging inspection of a head-up display: projection distance, astigmatism, field curvature, and distortions

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

doi:10.1117/12.2530964

3 October 2019 Single shot plenoptic optical imaging inspection of a head-up display: projection distance, astigmatism, field curvature, and distortions

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

Author Affiliations +

Proceedings Volume 11207, Fourth International Conference on Applications of Optics and Photonics; 1120730 (2019) https://doi.org/10.1117/12.2530964
Event: IV International Conference on Applications of Optics and Photonics (AOP 2019), 2019, Lisbon, Portugal

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.

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Moisés A. S. Duarte, Eduardo J. Nunes-Pereira, Boris P. J. Bret, Paulo M. F. Forté, Flávio P. Ferreira, Marco A. Sousa, and José M. González-Méijome "Single shot plenoptic optical imaging inspection of a head-up display: projection distance, astigmatism, field curvature, and distortions", Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 1120730 (3 October 2019); https://doi.org/10.1117/12.2530964

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