Recent Advances in the Processing and Rendering Algorithms for Computer-Generated Holography

Corda, R.; Giusto, Daniele D.; Liotta, Antonio; Song, Wei; Perra, Cristian

doi:10.3390/electronics8050556

Cited by 12 publications

(8 citation statements)

References 63 publications

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“…Although they differ in image quality, size, weight, and even performance, advances in this technology are visible, and subsequently improved versions or prototype devices show that it is becoming a realistic-looking hologram and will improve over the next few years. The current quality of holograms already allows its effective application in everyday life [28]. In El-Schich et al [29], the cancer cells using computer-generated holography were analyzed.…”

Section: Ar/mr Applicationmentioning

confidence: 99%

Immersive technologies as a solution for general data protection regulation in Europe and impact on the COVID-19 pandemic

et al. 2021

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Background: General data protection regulation (GDPR) provides rules according to which data should be managed and processed in a secure and appropriate way for patient requirements and security. Currently, everyone in Europe is covered by GDPR. Thus, the medical practice also requires access to patient data in a safe and secure way. Methods: Holographic technology allows users to see everything visible ona computer screen in a new and less restricted way, i. e. without the limitations of traditional computers and screens. Results: In this study, a three-dimensional holographic doctors' assistant is designed and implemented in a way that meets the GDPR requirements. The HoloView application, which is tailored to run on Microsoft HoloLens, is proposed toallow display and access to personal data and so-called sensitive information of all individual patients without the risk that it will be presented to unauthorized persons. Conclusions: To enhance the user experience and remain consistent with GSPR, a holographic desk is proposed that allows displaying patient data and sensitive information only in front of the doctor's eyes using mixed reality glasses. Last but not least, it boasts of a reduction in infection risk for the staff during the COVID-19 pandemic, affording medical care to be carried out by as few doctors as possible.

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Section: Ar/mr Applicationmentioning

confidence: 99%

Immersive technologies as a solution for general data protection regulation in Europe and impact on the COVID-19 pandemic

et al. 2021

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“…Calculation of CGHs can be carried out with different approaches depending on the geometry of the problem [33]. For the case of wide-angle CGHs, it is necessary to process the enormous amount of wavefield information efficiently.…”

Section: Update Of the Blank View Regionmentioning

confidence: 99%

Fast 3D Content Update for Wide-Angle Holographic Near-Eye Display

et al. 2021

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Near-eye holographic displays are the holy grail of wear-on 3D display devices because they are intended to project realistic wide-angle virtual scenes with parameters matching human vision. One of the key features of a realistic perspective is the ability to move freely around the virtual scene. This can be achieved by addressing the display with wide-angle computer-generated holograms (CGHs) that enable continuous viewpoint change. However, to the best of our knowledge there is no technique able to generate these types of content. Thus, in this work we propose an accurate and non-paraxial hologram update method for wide-angle CGHs that supports continuous viewpoint change around the scene. This method is based on the assumption that with a small change in perspective, two consecutive holograms share overlapping data. This enables reusing the corresponding part of the information from the previous view, eliminating the need to generate an entirely new hologram. Holographic information for the next viewpoint is calculated in two steps: first, a tool approximating the Angular Spectrum Propagation is proposed to generate the hologram data from previous viewpoint; and second, the efficient Phase Added Stereogram algorithm is utilized for generating the missing hologram content. This methodology offers fast and accurate calculations at the same time. Numerical and optical experiments are carried out to support the results of the proposed method.

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“…Yamaguchi reviews light-field display technologies based on both light rays and wavefronts [9]. Corda et al presents an in-depth review of the algorithms for advanced processing and rendering of CGHs [10]. Yoshikawa and Yamaguchi review holographic printers for CGHs [11].…”

Section: Introductionmentioning

confidence: 99%

Polygon-based computer-generated holography: a review of fundamentals and recent progress [Invited]

et al. 2022

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In this review paper, we first provide comprehensive tutorials on two classical methods of polygon-based computergenerated holography: the traditional method (also called the fast-Fourier-transform-based method) and the analytical method. Indeed, other modern polygon-based methods build on the idea of the two methods. We will then present some selective methods with recent developments and progress and compare their computational reconstructions in terms of calculation speed and image quality, among other things. Finally, we discuss and propose a fast analytical method called the fast 3D affine transformation method, and based on the method, we present a numerical reconstruction of a computer-generated hologram (CGH) of a 3D surface consisting of 49,272 processed polygons of the face of a real person without the use of graphic processing units; to the best of our knowledge, this represents a state-of-the-art numerical result in polygon-based computed-generated holography. Finally, we also show optical reconstructions of such a CGH and another CGH of the Stanford bunny of 59,996 polygons with 31,724 processed polygons after back-face culling. We hope that this paper will bring out some of the essence of polygon-based computer-generated holography and provide some insights for future research.

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Recent Advances in the Processing and Rendering Algorithms for Computer-Generated Holography

Cited by 12 publications

References 63 publications

Immersive technologies as a solution for general data protection regulation in Europe and impact on the COVID-19 pandemic

Immersive technologies as a solution for general data protection regulation in Europe and impact on the COVID-19 pandemic

Fast 3D Content Update for Wide-Angle Holographic Near-Eye Display

Polygon-based computer-generated holography: a review of fundamentals and recent progress [Invited]

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