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Search Results (5)

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Keywords = holographic portrait

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14 pages, 3918 KiB  
Article
Transforming Monochromatic Images into 3D Holographic Stereograms Through Depth-Map Extraction
by Oybek Mirzaevich Narzulloev, Jinwon Choi, Jumamurod Farhod Ugli Aralov, Leehwan Hwang, Philippe Gentet and Seunghyun Lee
Appl. Sci. 2025, 15(10), 5699; https://doi.org/10.3390/app15105699 - 20 May 2025
Viewed by 522
Abstract
Traditional holographic printing techniques prove inadequate when only input data are available. Therefore, this paper proposes a new artificial-intelligence-based process for generating digital holographic stereograms from a single black-and-white photograph. This method eliminates the need for stereo cameras, photogrammetry, or 3D models. In [...] Read more.
Traditional holographic printing techniques prove inadequate when only input data are available. Therefore, this paper proposes a new artificial-intelligence-based process for generating digital holographic stereograms from a single black-and-white photograph. This method eliminates the need for stereo cameras, photogrammetry, or 3D models. In this approach, a convolutional neural network and deep convolutional neural field model are used for image colorization and a depth-map estimation, respectively. Subsequently, the colored image and depth map are used to generate the multiview images required for creating holographic stereograms. This method efficiently preserves the visual characteristics of the original black-and-white images in the final digital holographic portraits. This provides a new and accessible method for holographic reconstruction using limited data, enabling the generation of 3D holographic content from existing images. Experiments were conducted using black-and-photographs of two historical figures, and highly realistic holograms were obtained successfully. This study has significant implications for cultural preservation, personal archiving, and the generation of life-like holographic images with minimal input data. By bridging the gap between historical photographic sources and modern holographic techniques, our approach opens up new possibilities for memory preservation and visual storytelling. Full article
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8 pages, 4459 KiB  
Communication
Recording of Full-Color Snapshot Digital Holographic Portraits Using Neural Network Image Interpolation
by Philippe Gentet, Matteo Coffin, Yves Gentet and Seung-Hyun Lee
Appl. Sci. 2023, 13(22), 12289; https://doi.org/10.3390/app132212289 - 13 Nov 2023
Cited by 7 | Viewed by 2825
Abstract
For 60 years, high-energy pulsed lasers have enabled the recording of extremely realistic portraits of living people within a few nanoseconds. In the 21st century, this confidential technique, which requires great skill and equipment, has almost disappeared because of the final monochromatic color [...] Read more.
For 60 years, high-energy pulsed lasers have enabled the recording of extremely realistic portraits of living people within a few nanoseconds. In the 21st century, this confidential technique, which requires great skill and equipment, has almost disappeared because of the final monochromatic color of the holograms, which does not appeal to the public. In this study, we show that ultra-realistic, full-color, and full-parallax snapshot holographic portraits can be recorded using a limited number of synchronized HD cameras. Experiments were successfully conducted using the digital CHIMERA holographic stereogram printing technique combined with image interpolation using a neural network. This new recording method allows holographic portraits to be developed and disseminated to the public on a larger scale. Full article
(This article belongs to the Special Issue Digital Holography and Its Application)
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7 pages, 2029 KiB  
Communication
Holostereosynthesis: An Improvement to Louis Lumière’s Photostereosynthesis Technique
by Philippe Gentet, Yves Gentet and Seunghyun Lee
Appl. Sci. 2022, 12(24), 12524; https://doi.org/10.3390/app122412524 - 7 Dec 2022
Cited by 2 | Viewed by 2240
Abstract
In 1920, Louis Lumière, one of the fathers of Cinématograph, invented photostereosynthesis, a photography technique that could recreate three-dimensional images without a specific artifice. This method involved stacking six to eight photographs of the same subject, usually a portrait, recorded with a progressive [...] Read more.
In 1920, Louis Lumière, one of the fathers of Cinématograph, invented photostereosynthesis, a photography technique that could recreate three-dimensional images without a specific artifice. This method involved stacking six to eight photographs of the same subject, usually a portrait, recorded with a progressive shift in focus and observed together through transparency. This invention remained at the laboratory experiment stage, and only a dozen portraits of famous people from the time of Lumière are known. The final device is a complex assembly of glass plates mounted on a wooden frame, and it is fragile, bulky, heavy, and difficult to build and observe. Here, we demonstrate that we can replace the stack of photographic plates with a single reflection hologram. Experiments were successfully conducted using the digital CHIMERA holographic stereogram printing technique. This new method of holostereosynthesis will facilitate the restoration and dissemination of the historical portraits originally recorded by Louis Lumière and may also allow the creation of brand new images. Full article
(This article belongs to the Special Issue Holographic Technologies: Theory and Practice)
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11 pages, 4982 KiB  
Article
Recording a Hologram Transmitted over a Communication Channel on One Sideband
by Sergey A. Shoydin, Sergey B. Odinokov, Artem L. Pazoev, Ivan K. Tsyganov and Ekaterina A. Drozdova
Appl. Sci. 2021, 11(23), 11468; https://doi.org/10.3390/app112311468 - 3 Dec 2021
Cited by 3 | Viewed by 2656
Abstract
The paper presents experimental results on the recording and restoration of 3D holographic frames suitable for transmitting 3D holographic images with the frame rate required for TV images and a resolution of the Full HD standard and higher. The Patent RF No. 2707582 [...] Read more.
The paper presents experimental results on the recording and restoration of 3D holographic frames suitable for transmitting 3D holographic images with the frame rate required for TV images and a resolution of the Full HD standard and higher. The Patent RF No. 2707582 proposed a method for compressing holographic information and transmitting it using a procedure similar to SSB over conventional communication channels. In this work, the holographic information of a 3D portrait of a person, transmitted and received via the Wi-Fi communication channel, was restored in the form of a rainbow hologram, as one of a variety of holograms, by the computer addition of the carrier spatial frequency, and then hologram was actually produced on a photoresist. This technology can be used to create a holographic phototelegraph or, if there is a dynamic holographic display, to create a holographic television and 3D augmented reality. Full article
(This article belongs to the Special Issue Holographic Technologies: Theory and Practice)
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22 pages, 535 KiB  
Article
Geometric Model of Black Hole Quantum N-portrait, Extradimensions and Thermodynamics
by Antonia M. Frassino, Sven Köppel and Piero Nicolini
Entropy 2016, 18(5), 181; https://doi.org/10.3390/e18050181 - 14 May 2016
Cited by 25 | Viewed by 6913
Abstract
Recently a short scale modified black hole metric, known as holographic metric, has been proposed in order to capture the self-complete character of gravity. In this paper we show that such a metric can reproduce some geometric features expected from the quantum N [...] Read more.
Recently a short scale modified black hole metric, known as holographic metric, has been proposed in order to capture the self-complete character of gravity. In this paper we show that such a metric can reproduce some geometric features expected from the quantum N-portrait beyond the semi-classical limit. We show that for a generic N this corresponds to having an effective energy momentum tensor in Einstein equations or, equivalently, non-local terms in the gravity action. We also consider the higher dimensional extension of the metric and the case of an AdS cosmological term. We provide a detailed thermodynamic analysis of both cases, with particular reference to the repercussions on the Hawking-Page phase transition. Full article
(This article belongs to the Special Issue Entropy in Quantum Gravity and Quantum Cosmology)
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