Dr. Roberts Zabels Profile

Dr. Roberts Zabels

R&D Researcher at Lightspace Technologies SIA

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Publications (10)

Proceedings Article | 12 September 2021 Presentation + Paper

Sputtered SiOxNy thin films: improving optical efficiency of liquid crystal diffuser elements in multi-focal near-to-eye display architecture

Ainars Ozols, Gatis Mozolevskis, Edvins Letko, Martins Rutkis, Roberts Zabels, Elza Linina, Ilmars Osmanis

Proceedings Volume 11872, 118720I (2021) https://doi.org/10.1117/12.2596885

KEYWORDS: Diffusers, Refractive index, Coating, Transmittance, Liquid crystals, Dielectrics, Sputter deposition, Oxygen, Thin films, LCDs

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Proceedings Article | 20 June 2021 Presentation + Paper

Fast-switching liquid crystal diffusers: outlook on optical properties and applicability in volumetric display architecture

Ainārs Ozols, Edmunds Zutis, Roberts Zabels, Elza Linina, Kriss Osmanis, Ilmars Osmanis

Proceedings Volume 11788, 117880U (2021) https://doi.org/10.1117/12.2594147

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Proceedings Article | 28 March 2021 Presentation + Paper

Binocular function measures as predictors of user performance in stereoscopic augmented reality

Tatjana Pladere, Artis Luguzis, Roberts Zabels, Rendijs Smukulis, Viktorija Barkovska, Linda Krauze, Vita Konosonoka, Aiga Svede, Gunta Krumina

Proceedings Volume 11765, 117650T (2021) https://doi.org/10.1117/12.2591934

KEYWORDS: Augmented reality, Visualization, Tolerancing, Visual system, Head-mounted displays

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Proceedings Article | 28 March 2021 Poster + Presentation + Paper

Reducing motion to photon latency in multi-focal augmented reality near-eye display

Roberts Zabels, Rendijs Smukulis, Ralfs Fenuks, Andris Kučiks, Elza Linina, Kriss Osmanis, Ilmars Osmanis

Proceedings Volume 11765, 117650W (2021) https://doi.org/10.1117/12.2578144

KEYWORDS: Augmented reality, Visualization, Virtual reality, Stereoscopic displays, Solid state electronics, Motion analysis, Head-mounted displays, Displays, Data transmission

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It is foreseen that the most convenient hardware for depiction of augmented reality (AR) will be optical seethrough head-mounted displays. Currently such systems are utilizing single focal plane and are inflicting vergenceaccommodation conflict to the human visual system – limiting wide acceptance. In this work, we analyze an optical seethrough AR head-mounted display prototype which has four focal planes operating in time-sequential mode thus mitigating limitation of single focal plane devices. Nevertheless, optical see-through nature implies requirement of very short motion-to-photon latency not to cause noticeable misalignment between the digital content and real-world scene. The utilized prototype display relies on commercial visual-SLAM spatial tracking module (Intel realsense T265) and within this work we analyzed factors improving motion-to-photon latency with the provided hardware setup. The performance analysis of the T265 module revealed slight translational and angular jitter – on the order of <1 mm and <15 arcseconds, and velocity readout of few cm/s from a completely still IMU. The experimentally determined motion-tophoton latency and render-to-photon latency was 46±6 ms and 38 ms respectively. To overcome IMU positional jitter, pose averaging with variable width of the averaging window was implemented. Based on immediate acceleration and velocity data the size of the averaging window was adjusted. To perform pose prediction a basic rotational-axis offset model was verified. Based on prerecorded head movements, a training model reduced the error between the predicted and actual recorded pose. The optimization parameters were corresponding offset values of the IMU’s rotational axis, translational and angular velocity as well as angular acceleration. As expected, the highest weight for the most accurate predictions was observed for velocities following angular acceleration. The role of offset values wasn’t significant. For improved perceived experience and motion-to-photon latency reduction we consider further investigation of simple trained neural networks for more accurate real-time pose prediction as well as investigation of content-driven adaptive image output overriding default order of image plane output in a time-sequential sequence.

Proceedings Article | 21 August 2020 Presentation + Paper

Comparative assessment of brain activity during depth perception of stereoscopic and volumetric images

Tatjana Pladere, Mehrdad Naderi, Roberts Zabels, Kriss Osmanis, Gunta Krumina

Proceedings Volume 11481, 1148108 (2020) https://doi.org/10.1117/12.2567461

KEYWORDS: Neuroimaging, Brain, 3D image processing, Visualization, Electroencephalography, 3D volumetric display

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Proceedings Article | 26 February 2020 Presentation + Paper

Volumetric technology: enabling near-work compatible AR displays

R. Zabels, K. Osmanis, A. Ozols, M. Narels, U. Gertners, R. Smukulis, I. Osmanis

Proceedings Volume 11304, 113040E (2020) https://doi.org/10.1117/12.2544891

KEYWORDS: Augmented reality, Image quality, Visualization, Diffusers, 3D volumetric displays, LCDs, Optical components

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Proceedings Article | 21 June 2019 Presentation + Paper

Accommodation corrected 3D displays using spatial volume demultiplexer chip

K. Osmanis, R. Zabels, A. Ozols, M. Narels, U. Gertners, K. Rūtenbergs, I. Osmanis

Proceedings Volume 11062, 110620T (2019) https://doi.org/10.1117/12.2527238

KEYWORDS: Beam splitters, Augmented reality, Optical design, Diffusers, Demultiplexers, Reflectivity, Optical components, Spatial light modulators, Stereoscopic displays, Waveguides

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Proceedings Article | 1 March 2019 Presentation + Paper

Integrated head-mounted display system based on a multi-planar architecture

Roberts Zabels, Krišs Osmanis, Mārtiņš Narels, Rendijs Smukulis, Ilmārs Osmanis

Proceedings Volume 10942, 1094208 (2019) https://doi.org/10.1117/12.2509954

KEYWORDS: 3D displays, Eye, Diffusers, Prototyping, Head-mounted displays, Stereoscopic displays, Chemical elements, Optical components, 3D image processing, Image resolution

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Proceedings Article | 16 May 2018 Paper

Methods of voxel data rendering for visualizing on multi-layer volumetric displays

K. Osmanis, G. Valters, R. Zabels, R. Smukulis, I. Osmanis, L. Kalnins, U. Kandere, A. Ozols

Proceedings Volume 10666, 1066611 (2018) https://doi.org/10.1117/12.2315606

KEYWORDS: Diffusers, Optical components, Image processing, 3D displays, Visualization, Data processing, 3D image processing, 3D volumetric display, Chemical elements, 3D volumetric displays

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Proceedings Article | 8 February 2018 Paper

Advanced multiplanar volumetric 3D display

K. Osmanis, G. Valters, R. Zabels, U. Gertners, I. Osmanis, L. Kalnins, U. Kandere, A. Ozols

Proceedings Volume 10555, 1055510 (2018) https://doi.org/10.1117/12.2297629

KEYWORDS: Diffusers, Optical components, 3D volumetric display, 3D displays, 3D image processing, Projection systems, 3D volumetric displays, Chemical elements, Liquid crystals, Transparency

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Showing 5 of 10 publications

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