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Articoli di riviste sul tema "3D holograms"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 10 febbraio 2022

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1

Shimobaba, Tomoyoshi, Shuhei Katsuyama, Takashi Nishitsuji, Ikuo Hoshi, Harutaka Shiomi, Fan Wang, Takashi Kakue, Naoki Takada e Tomoyoshi Ito. "Motion Parallax Holograms Generated from an Existing Hologram". Applied Sciences 11, n. 7 (25 marzo 2021): 2933. http://dx.doi.org/10.3390/app11072933.

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Generating new motion parallax holograms is required for holographic head-mounted displays when the head moves. Additionally, it is required for hologram generation from light field data that consist of a number of motion parallax images. However, re-rendering three-dimensional (3D) scenes and re-calculating holograms are computationally complex. Therefore, we propose a generation strategy of holograms with different motion parallax from an existing hologram without re-rendering 3D scenes and re-calculating holograms. The proposed method employs Fourier band-pass filtering and the simple relation of trigonometric functions, which makes it capable of skipping the computationally complex processes.

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Brun, H., R. A. B. Bugge, L. K. R. Suther, S. Birkeland, R. Kumar, E. Pelanis e O. J. Elle. "Mixed reality holograms for heart surgery planning: first user experience in congenital heart disease". European Heart Journal - Cardiovascular Imaging 20, n. 8 (6 dicembre 2018): 883–88. http://dx.doi.org/10.1093/ehjci/jey184.

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Abstract Aims Proof of concept and feasibility study for preoperative diagnostic use of mixed reality (MR) holograms of individual 3D heart models from standard cardiac computed tomography angiograms (CTA) images. Optimal repair for complex congenital heart disease poses high demands on 3D anatomical imagination. Three-dimensional printed heart models are increasingly used for improved morphological understanding during surgical and interventional planning. Holograms are a dynamic and interactive alternative, probably with wider applications. Methods and results A 3D heart model was segmented from CTA images in a patient with double outlet right ventricle and transposition of the great arteries (DORV-TGA). The hologram was visualized in the wearable MR platform HoloLens® for 36 paediatric heart team members who filled out a diagnostic and quality rating questionnaire. Morphological and diagnostic output from the hologram was assessed and the 3D experience was evaluated. Locally developed app tools such as hologram rotation, scaling, and cutting were rated. Anatomy identification and diagnostic output was high as well as rating of 3D experience. Younger and female users rated the app tools higher. Conclusion This preliminary study demonstrates that MR holograms as surgical planning tool for congenital heart disease may have a high diagnostic value and contribute to understanding complex morphology. The first users experience of the hologram presentation was found to be very positive, with a preference among the female and the younger users. There is potential for improvement of the hologram manipulation tools.

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Arce, Terek, Henry Fuchs e Kyla McMullen. "The Effects of 3D Audio on Hologram Localization in Augmented Reality Environments". Proceedings of the Human Factors and Ergonomics Society Annual Meeting 61, n. 1 (settembre 2017): 2115–19. http://dx.doi.org/10.1177/1541931213602010.

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Currently available augmented reality systems have a narrow field of view, giving users only a small window to look through to find holograms in the environment. The challenge for developers is to direct users’ attention to holograms outside this window. To alleviate this field of view constraint, most research has focused on hardware improvements to the head mounted display. However, incorporating 3D audio cues into programs could also aid users in this localization task. This paper investigates the effectiveness of 3D audio on hologram localization. A comparison of 3D audio, visual, and mixed-mode stimuli shows that users are able to localize holograms significantly faster under conditions that include 3D audio. To our knowledge, this is the first study to explore the use of 3D audio in localization tasks using augmented reality systems. The results provide a basis for the incorporation of 3D audio in augmented reality applications.

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Shoydin, S. A. "Synthesis of holograms received by a communication channel". Computer Optics 44, n. 4 (agosto 2020): 547–51. http://dx.doi.org/10.18287/2412-6179-co-694.

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A method for the synthesis of holograms that reconstruct a 3D image using two 2D images, including a topographic map of the surface of a 3D object and photographs of the texture of its surface obtained using coherent and incoherent radiation is proposed. The method is suitable for transmitting information about a 3D object via a communication channel at a distance and subsequent synthesis of holograms at a distance from the holography object. It can be used in augmented reality devices, when creating holographic cameras and 3D video cameras, in 3D projectors and microscopes, devices with a synthesized aperture. The proposed method for the remote hologram synthesis is suitable for reproducing 3D holographic images of distant objects at different parts of the electromagnetic spectrum. Examples of 3D image restoration in the infrared spectral range are given. The method is also suitable for the synthesis of holograms in the UV, THz, and even radio range.

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Shoydin, Sergey A., e Artem L. Pazoev. "CORRECTION OF PROJECTIVE DEFORMATIONS OF 3D OBJECT, ON THE STAGE OF HOLOGRAM FORMATION". Interexpo GEO-Siberia 8, n. 1 (8 luglio 2020): 97–107. http://dx.doi.org/10.33764/2618-981x-2020-8-1-97-107.

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The problems of digital synthesis of holograms associated with a discrete representation of a signal forming a holographic image are analyzed. One of the significant limitations is the technological problems of the formation of holographic structures pointwise due to diffraction limitations of the size of the focused spot of the optical-mechanical builder. This narrows the spectrum of possible spatial frequencies of the pointwise synthesized hologram in comparison with the classical hologram recorded in an analog way, which in turn leads to difficulties in recording holograms with a large depth of 3D image. We discuss a way to overcome this problem by using an optical projection system with the possibility of both transverse and longitudinal image size. Some possibilities of constructing such systems are shown and experimentally confirmed, and some problems of deformation distortions of 3D images arising during their creation are analyzed.

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Li, Bingjian, Zi Yang Kang, Jiahuang Lin, Ye Yeo e Guoxian Tan. "General theories of reflection and transmission scratch holograms". Canadian Journal of Physics 95, n. 5 (maggio 2017): 432–39. http://dx.doi.org/10.1139/cjp-2016-0471.

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Scratch holograms can be created easily and the associated interesting phenomena may be observed in daily life. In this paper, general and quantitative theories of scratch holograms were derived and presented. Both the reflection case where a scratch hologram reflects light, and the transmission case where it refracts and transmits light, were considered. A predictive model, which has not been presented in the literature, was developed. The model was able to solve for the position of the bright points along the scratches using a computational method. Extensive experimentation was carried out with scratch holograms of two designs to verify the model. Photographic evidence demonstrated extremely good fits with the theoretical predictions. The model was then used to theoretically simulate the 3D spatial positions of the hologram and also quantify distortion present in the images to illustrate novel real-life applications of the theories presented.

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Boriskevich, A. A., V. K. Erohovets e V. V. Tkachenko. "3D and 2D/3D holograms model". Optical Memory and Neural Networks 21, n. 4 (ottobre 2012): 242–48. http://dx.doi.org/10.3103/s1060992x12040030.

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Hua, Hangbo, Takeshi Yamaguchi e Hiroshi Yoshikawa. "Partially Overlapping Printing with Digital Filter to Improve Quality of Volume Hologram Printer – Numerical Simulation –". Applied Sciences 10, n. 11 (7 giugno 2020): 3963. http://dx.doi.org/10.3390/app10113963.

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The volume hologram printer is useful for 3D display, because it is selective to the wavelength and be able to reconstruct with the natural illumination. There are many studies of a volume hologram printer been studied to output a volume hologram from a computer-generated hologram. The final volume hologram consists of tiled small holograms and the tiling manner often causes spilt lines which will have impact on image quality. With an intent to get rid of the split lines and improve the quality, fully overlapping printing was proposed recently. Each elemental hologram is overlapped both in vertical and horizontal directions by 50%. Then, the hologram is printed four times in each area and it makes the printing speed four times slower. For this case, partially overlapping printing is proposed in this paper to improve image quality with small effect in printing speed. For partial overlapping, a digital spatial filter is projected and added to every elemental hologram. Using the digital spatial filter, different partially overlapped holograms are calculated and reconstructed to compare to the non-overlapped ones. The simulation result shows that the overlapped one (10% in both vertical and horizontal) has much weaker gaps and black lines.

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Rosen, Joseph, Vijayakumar Anand, Mani Rai, Saswata Mukherjee e Angika Bulbul. "Review of 3D Imaging by Coded Aperture Correlation Holography (COACH)". Applied Sciences 9, n. 3 (12 febbraio 2019): 605. http://dx.doi.org/10.3390/app9030605.

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Coded aperture correlation holography (COACH) is a relatively new technique to record holograms of incoherently illuminated scenes. In this review, we survey the main milestones in the COACH topic from two main points of view. First, we review the prime architectures of optical hologram recorders in the family of COACH systems. Second, we discuss some of the key applications of these recorders in the field of imaging in general, and for 3D super-resolution imaging, partial aperture imaging, and seeing through scattering medium, in particular. We summarize this overview with a general perspective on this research topic and its prospective directions.

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Zheng, Huadong, Jianbin Hu, Chaojun Zhou e Xiaoxi Wang. "Computing 3D Phase-Type Holograms Based on Deep Learning Method". Photonics 8, n. 7 (15 luglio 2021): 280. http://dx.doi.org/10.3390/photonics8070280.

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Computer holography is a technology that use a mathematical model of optical holography to generate digital holograms. It has wide and promising applications in various areas, especially holographic display. However, traditional computational algorithms for generation of phase-type holograms based on iterative optimization have a built-in tradeoff between the calculating speed and accuracy, which severely limits the performance of computational holograms in advanced applications. Recently, several deep learning based computational methods for generating holograms have gained more and more attention. In this paper, a convolutional neural network for generation of multi-plane holograms and its training strategy is proposed using a multi-plane iterative angular spectrum algorithm (ASM). The well-trained network indicates an excellent ability to generate phase-only holograms for multi-plane input images and to reconstruct correct images in the corresponding depth plane. Numerical simulations and optical reconstructions show that the accuracy of this method is almost the same with traditional iterative methods but the computational time decreases dramatically. The result images show a high quality through analysis of the image performance indicators, e.g., peak signal-to-noise ratio (PSNR), structural similarity (SSIM) and contrast ratio. Finally, the effectiveness of the proposed method is verified through experimental investigations.

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Invited Paper, Hiroshi Yoshikawa. "Computer-generated holograms for 3D display". Chinese Optics Letters 7, n. 12 (2009): 1079–82. http://dx.doi.org/10.3788/col20090712.1079.

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Sahin, Erdem, Elena Stoykova, Jani Mäkinen e Atanas Gotchev. "Computer-Generated Holograms for 3D Imaging". ACM Computing Surveys 53, n. 2 (luglio 2020): 1–35. http://dx.doi.org/10.1145/3378444.

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Liu, Songxiang, Mao Xie, Zhicai Zhang, Xinghuo Wu, Fei Gao, Lin Lu, Jiayao Zhang, Yi Xie, Fan Yang e Zhewei Ye. "A 3D Hologram With Mixed Reality Techniques to Improve Understanding of Pulmonary Lesions Caused by COVID-19: Randomized Controlled Trial". Journal of Medical Internet Research 23, n. 9 (10 settembre 2021): e24081. http://dx.doi.org/10.2196/24081.

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Background The COVID-19 outbreak has now become a pandemic and has had a serious adverse impact on global public health. The effect of COVID-19 on the lungs can be determined through 2D computed tomography (CT) imaging, which requires a high level of spatial imagination on the part of the medical provider. Objective The purpose of this study is to determine whether viewing a 3D hologram with mixed reality techniques can improve medical professionals’ understanding of the pulmonary lesions caused by COVID-19. Methods The study involved 60 participants, including 20 radiologists, 20 surgeons, and 20 medical students. Each of the three groups was randomly divided into two groups, either the 2D CT group (n=30; mean age 29 years [range 19-38 years]; males=20) or the 3D holographic group (n=30; mean age 30 years [range 20=38 years]; males=20). The two groups completed the same task, which involved identifying lung lesions caused by COVID-19 for 6 cases using a 2D CT or 3D hologram. Finally, an independent radiology professor rated the participants' performance (out of 100). All participants in two groups completed a Likert scale questionnaire regarding the educational utility and efficiency of 3D holograms. The National Aeronautics and Space Administration Task Load Index (NASA-TLX) was completed by all participants. Results The mean task score of the 3D hologram group (mean 91.98, SD 2.45) was significantly higher than that of the 2D CT group (mean 74.09, SD 7.59; P<.001). With the help of 3D holograms, surgeons and medical students achieved the same score as radiologists and made obvious progress in identifying pulmonary lesions caused by COVID-19. The Likert scale questionnaire results showed that the 3D hologram group had superior results compared to the 2D CT group (teaching: 2D CT group median 2, IQR 1-2 versus 3D group median 5, IQR 5-5; P<.001; understanding and communicating: 2D CT group median 1, IQR 1-1 versus 3D group median 5, IQR 5-5; P<.001; increasing interest: 2D CT group median 2, IQR 2-2 versus 3D group median 5, IQR 5-5; P<.001; lowering the learning curve: 2D CT group median 2, IQR 1-2 versus 3D group median 4, IQR 4-5; P<.001; spatial awareness: 2D CT group median 2, IQR 1-2 versus 3D group median 5, IQR 5-5; P<.001; learning: 2D CT group median 3, IQR 2-3 versus 3D group median 5, IQR 5-5; P<.001). The 3D group scored significantly lower than the 2D CT group for the “mental,” “temporal,” “performance,” and “frustration” subscales on the NASA-TLX. Conclusions A 3D hologram with mixed reality techniques can be used to help medical professionals, especially medical students and newly hired doctors, better identify pulmonary lesions caused by COVID-19. It can be used in medical education to improve spatial awareness, increase interest, improve understandability, and lower the learning curve. Trial Registration Chinese Clinical Trial Registry ChiCTR2100045845; http://www.chictr.org.cn/showprojen.aspx?proj=125761

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Yu, Ding, Shang Wenbin, Yang Hong e Yang Yan. "Measurements of the Characteristics of Transparent Material Using Digital Holography". Advances in Materials Science and Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/598737.

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Digital holography is applied to measure the characteristics of transparent material. A digital hologram recording system to measure the surface of transparent material was established, and the digital holograms of transparent object were obtained in high quality. For postprocessing of hologram, the least-squares phase unwrapping algorithm was used in phase unwrapping, and the phase reconstruction image of transparent object was obtained. The information of material surfaces was measured and the characteristic was presented in 3D visualization. The validation experiment was conducted by NanoMap 500LS system; the results of validation experiment are well satisfied with the measurement by digital holography, which proved the feasibility of digital holographic technology as a good measurement tool for transparent material.

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Pozzi, Paolo, Laura Maddalena, Nicolò Ceffa, Oleg Soloviev, Gleb Vdovin, Elizabeth Carroll e Michel Verhaegen. "Fast Calculation of Computer Generated Holograms for 3D Photostimulation through Compressive-Sensing Gerchberg–Saxton Algorithm". Methods and Protocols 2, n. 1 (20 dicembre 2018): 2. http://dx.doi.org/10.3390/mps2010002.

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The use of spatial light modulators to project computer generated holograms is a common strategy for optogenetic stimulation of multiple structures of interest within a three-dimensional volume. A common requirement when addressing multiple targets sparsely distributed in three dimensions is the generation of a points cloud, focusing excitation light in multiple diffraction-limited locations throughout the sample. Calculation of this type of holograms is most commonly performed with either the high-speed, low-performance random superposition algorithm, or the low-speed, high performance Gerchberg–Saxton algorithm. This paper presents a variation of the Gerchberg–Saxton algorithm that, by only performing iterations on a subset of the data, according to compressive sensing principles, is rendered significantly faster while maintaining high quality outputs. The algorithm is presented in high-efficiency and high-uniformity variants. All source code for the method implementation is available as Supplementary Materials and as open-source software. The method was tested computationally against existing algorithms, and the results were confirmed experimentally on a custom setup for in-vivo multiphoton optogenetics. The results clearly show that the proposed method can achieve computational speed performances close to the random superposition algorithm, while retaining the high performance of the Gerchberg–Saxton algorithm, with a minimal hologram quality loss.

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Gao, Zhi-Fang, Hua-Dong Zheng e Ying-Jie Yu. "Holographic Three-Dimensional Imaging of Terra-Cotta Warrior Model Using Fractional Fourier Transform". Journal of Imaging 5, n. 8 (26 luglio 2019): 67. http://dx.doi.org/10.3390/jimaging5080067.

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Holographic three-dimensional (3D) imaging of Terra-Cotta Warrior model using Fractional Fourier Transform is introduced in this paper. Phase holograms of Terra-Cotta Warrior model are calculated from 60 horizontal viewing-angles by the use of fractional Fourier transform (FRT). Multiple phase holograms are calculated for each angle by adding proper pseudorandom phase to reduce the speckle noise of a reconstructed image. Experimental system based on high-resolution phase-only spatial light modulator (SLM) is built for 3D image reconstruction from the calculated phase holograms. The texture of the Terra-Cotta Warrior model is rough. The calculation of rough texture is optimized in order to show better model details. The effects of computing distance and layer thickness on imaging quality are analyzed finally.

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Jendral, Andreas, Ralf Bräuer e Olof Bryngdahl. "Computer-Generated Image Holograms for 3D-Display". Optical Review 2, n. 3 (giugno 1995): 187–88. http://dx.doi.org/10.1007/s10043-995-0187-7.

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Zhang, Hao, Liangcai Cao e Guofan Jin. "Scaling of Three-Dimensional Computer-Generated Holograms with Layer-Based Shifted Fresnel Diffraction". Applied Sciences 9, n. 10 (24 maggio 2019): 2118. http://dx.doi.org/10.3390/app9102118.

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Holographic three-dimensional (3D) displays can reconstruct a whole wavefront of a 3D scene and provide rich depth information for the human eyes. Computer-generated holographic techniques offer an efficient way for reconstructing holograms without complicated interference recording systems. In this work, we present a technique for generating 3D computer-generated holograms (CGHs) with scalable samplings, by using layer-based diffraction calculations. The 3D scene is partitioned into multiple layers according to its depth image. Shifted Fresnel diffraction is used for calculating the wave diffractions from the partitioned layers to the CGH plane with adjustable sampling rates, while maintaining the depth information. The algorithm provides an effective method for scaling 3D CGHs without an optical zoom module in the holographic display system. Experiments have been performed, demonstrating that the proposed method can reconstruct quality 3D images at different scale factors.

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Kelly, Damien P., David S. Monaghan, Nitesh Pandey, Tomasz Kozacki, Aneta Michałkiewicz, Grzegorz Finke, Bryan M. Hennelly e Malgorzata Kujawinska. "Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays". International Journal of Digital Multimedia Broadcasting 2010 (2010): 1–14. http://dx.doi.org/10.1155/2010/759323.

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The application of digital holography as a viable solution to 3D capture and display technology is examined. A review of the current state of the field is presented in which some of the major challenges involved in a digital holographic solution are highlighted. These challenges include (i) the removal of the DC and conjugate image terms, which are features of the holographic recording process, (ii) the reduction of speckle noise, a characteristic of a coherent imaging process, (iii) increasing the angular range of perspective of digital holograms (iv) and replaying captured and/or processed digital holograms using spatial light modulators. Each of these challenges are examined theoretically and several solutions are put forward. Experimental results are presented that demonstrate the validity of the theoretical solutions.

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BAGCHI, ARJUN, e DANIEL GRUMILLER. "HOLOGRAMS OF FLAT SPACE". International Journal of Modern Physics D 22, n. 12 (ottobre 2013): 1342003. http://dx.doi.org/10.1142/s0218271813420030.

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The holographic principle has a concrete realization in the Anti-de Sitter/Conformal Field Theory (AdS/CFT) correspondence. If this principle is a true fact about quantum gravity then it must also hold beyond AdS/CFT. In this paper, we address specifically holographic field theory duals of gravitational theories in asymptotically flat spacetimes. We present some evidence of our recent conjecture that three-dimensional (3d) conformal Chern–Simons gravity (CSG) with flat space boundary conditions is dual to an extremal CFT.

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Joachimczak, Michał, Juan Liu e Hiroshi Ando. "Effects of the Size of Mixed-Reality Person Representations on Stress and Presence in Telecommunication". International Journal of Semantic Computing 13, n. 03 (settembre 2019): 311–28. http://dx.doi.org/10.1142/s1793351x19400130.

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We study how mixed reality (MR) telepresence can enhance long-distance human interaction and how altering 3D representations of a remote person can be used to modulate stress and anxiety during social interactions. To do so, we developed an MR telepresence system employing commodity depth sensors and Microsoft’s Hololens. A textured, polygonal 3D model of a person was reconstructed in real time and transmitted over network for rendering in remote location using HoloLens. In this study, we used mock job interview paradigm to induce stress in human–subjects interacting with an interviewer presented as an MR hologram. Participants were exposed to three different types of real-time reconstructed virtual holograms of the interviewer, a natural-sized 3D reconstruction (NR), a miniature 3D reconstruction (SR) and a 2D-display representation (LCD). Participants reported their subjective experience through questionnaires, while their biophysical responses were recorded. We found that the size of 3D representation of a remote interviewer had a significant effect on participants’ stress levels and their sense of presence. The questionnaire data showed that NR condition induced more stress and presence than SR condition and was significantly different from LCD condition. We also found consistent patterns in the biophysical data.

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Tahara, Tatsuki, Reo Otani e Yasuhiro Takaki. "Wavelength-Selective Phase-Shifting Digital Holography: Color Three-Dimensional Imaging Ability in Relation to Bit Depth of Wavelength-Multiplexed Holograms". Applied Sciences 8, n. 12 (28 novembre 2018): 2410. http://dx.doi.org/10.3390/app8122410.

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The quality of reconstructed images in relation to the bit depth of holograms formed by wavelength-selective phase-shifting digital holography was investigated. Wavelength-selective phase-shifting digital holography is a technique to obtain multiwavelength three-dimensional (3D) images with a full space-bandwidth product of an image sensor from wavelength-multiplexed phase-shifted holograms and has been proposed since 2013. The bit resolution required to obtain a multiwavelength holographic image was quantitatively and experimentally evaluated, and the relationship between wavelength resolution and dynamic range of an image sensor was numerically simulated. The results indicate that two-bit resolution per wavelength is required to conduct color 3D imaging.

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Bordbar, Behzad, Haowen Zhou e Partha P. Banerjee. "3D object recognition through processing of 2D holograms". Applied Optics 58, n. 34 (23 ottobre 2019): G197. http://dx.doi.org/10.1364/ao.58.00g197.

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Gao, Hongyue, Suna Li, Jicheng Liu, Wen Zhou, Fan Xu, Zehang Dai, Xiaoxi Cheng, Huilin Fang, Xiaoqian Ge e Lining Sun. "Investigation on dynamic holographic display in liquid crystal film doped with carbon dots". Materials Express 10, n. 6 (1 giugno 2020): 780–87. http://dx.doi.org/10.1166/mex.2020.1743.

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In this paper, we studied the holographic properties of liquid crystal (LC) thin film doped with carbon dots (CDs) which can be used as real-time holographic display screen. The maximum value of diffraction efficiency can reach up to 30% by using a low applied electric field 0.2 V/μm. Holograms in the LC film can be dynamically formed and self-erased. The hologram build-up time and the hologram self-erasure time in the material is fast enough to realize video refresh rate. In addition, the forming process of hologram was studied. The holographic diffraction efficiency was measured depending on the intensity of recording light, applied electric field, the intensity of readout light, and readout light polarization direction. Triple enhancement of the diffraction efficiency value by the modulation of voltage under the condition of low recording energy is presented. Therefore, we develop an easy way to obtain real-time dynamic holographic red, green and blue displays with high diffraction efficiency, which allow the LC film doped with CDs to be used as a holographic 3D display screen.

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Kvasnytsya Roksolyana. "MODERN TECHNOLOGIES AS A COMPONENT OF THE RUNWAY SCENOGRAPHY". World Science 2, n. 2(42) (28 febbraio 2019): 52–55. http://dx.doi.org/10.31435/rsglobal_ws/28022019/6362.

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The subject of this article is determined by the need for an analysis of the lighting design and its application, specifically its aesthetic component, in fashion runway design. To analyse the application of modern lighting design techniques, namely light installations, 3D visualization, 3D and 4D holograms while preparing runways for fashion shows.

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Porshneva, L. A., P. A. Cheremkhin, N. N. Evtikhiev, V. V. Krasnov, V. G. Rodin e S. N. Starikov. "Dynamic Reconstruction of 3D-scenes from Registered Digital Holograms". Physics Procedia 73 (2015): 333–37. http://dx.doi.org/10.1016/j.phpro.2015.09.153.

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Nagashima, Kenji. "3D computer-generated holograms using 1D Fourier transform operations". Optics & Laser Technology 30, n. 6-7 (settembre 1998): 361–66. http://dx.doi.org/10.1016/s0030-3992(98)00046-2.

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Sheet, Ahmed, Mai El Sayed, Mai Maged, Mona Ismail, Mariam Ali, Nahed Hussien Solouma e Tarek Abdel-Mottleb. "3D computer generated medical holograms using spatial light modulators". Journal of Electrical Systems and Information Technology 1, n. 2 (settembre 2014): 103–8. http://dx.doi.org/10.1016/j.jesit.2014.07.004.

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Ortega, Eduardo, Sai Madhukar Reddy, Israel Betancourt, Sina Roughani, Bethanie J. H. Stadler e Arturo Ponce. "Magnetic ordering in 45 nm-diameter multisegmented FeGa/Cu nanowires: single nanowires and arrays". Journal of Materials Chemistry C 5, n. 30 (2017): 7546–52. http://dx.doi.org/10.1039/c7tc02314f.

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Electron holograms allowed us to visualize the magnetic induction in a row of FeGa/Cu nanowires to see their neighboring effect, this observation demonstrate a limit to the density of individual bits in 3D memory.

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Invited Paper, Seung-Cheol Kim and Eun-Soo Kim. "Computational approaches for fast generation of digital 3D video holograms". Chinese Optics Letters 7, n. 12 (2009): 1083–91. http://dx.doi.org/10.3788/col20090712.1083.

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Zhou, Haowen, Xiaomeng Sui, Liangcai Cao e Partha P. Banerjee. "Digital correlation of computer-generated holograms for 3D face recognition". Applied Optics 58, n. 34 (21 ottobre 2019): G177. http://dx.doi.org/10.1364/ao.58.00g177.

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32

Deng, Juan, Zile Li, Guoxing Zheng, Jin Tao, Qi Dai, Liangui Deng, Ping’an He, Qiling Deng e Qingzhou Mao. "Depth perception based 3D holograms enabled with polarization-independent metasurfaces". Optics Express 26, n. 9 (24 aprile 2018): 11843. http://dx.doi.org/10.1364/oe.26.011843.

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33

Seifi, Mozhdeh, Loic Denis e Corinne Fournier. "Fast and accurate 3D object recognition directly from digital holograms". Journal of the Optical Society of America A 30, n. 11 (4 ottobre 2013): 2216. http://dx.doi.org/10.1364/josaa.30.002216.

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34

Canessa, Enrique, e Livio Tenze. "Morphing a Stereogram into Hologram". Journal of Imaging 6, n. 1 (2 gennaio 2020): 1. http://dx.doi.org/10.3390/jimaging6010001.

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Abstract (sommario):

We developed a method to transform stereoscopic two-dimensional (2D) images into holograms via unsupervised morphing deformations between left (L) and right (R) input images. By using robust DeepFlow and light-field rendering algorithms, we established correlations between a 2D scene and its three-dimensional (3D) display on a Looking Glass HoloPlay monitor. The possibility of applying this method, together with a lookup table for multi-view glasses-free 3D streaming with a stereo webcam, was also analyzed.

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35

Abbasi, Hamed, Talie Zarei, Neda Jalali Farahani e Adeleh Granmayeh Rad. "Studying the Recent Improvements in Holograms for Three-Dimensional Display". International Journal of Optics 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/519012.

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Abstract (sommario):

Displayers tend to become three-dimensional. The most advantage of holographic 3D displays is the possibility to observe 3D images without using glasses. The quality of created images by this method has surprised everyone. In this paper, the experimental steps of making a transmission hologram have been mentioned. In what follows, current advances of this science-art will be discussed. The aim of this paper is to study the recent improvements in creating three-dimensional images and videos by means of holographic techniques. In the last section we discuss the potentials of holography to be applied in future.

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36

Canessa, Enrique, e Livio Tenze. "Morpholo: A Hologram Generator Algorithm". Electronic Imaging 2020, n. 2 (26 gennaio 2020): 53–1. http://dx.doi.org/10.2352/issn.2470-1173.2020.2.sda-053.

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Abstract (sommario):

We introduce the Morpholo library which is able to convert a stereoscopic snapshot into a native multi-view image through morphing and takes into account display calibration data for specific slanted lenticular monitors. Holograms are generated fast by creating Lookup Tables to replace runtime computation. The implementation of Morpholo for glasses-free streaming of live 3D video is considered.

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37

Yang, Fan, Andrzej Kaczorowski e Tim D. Wilkinson. "Fast precalculated triangular mesh algorithm for 3D binary computer-generated holograms". Applied Optics 53, n. 35 (5 dicembre 2014): 8261. http://dx.doi.org/10.1364/ao.53.008261.

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38

Raupach, Sebastian M. F. "Stereoscopic 3D visualization of particle fields reconstructed from digital inline holograms". Optik 121, n. 13 (luglio 2010): 1194–97. http://dx.doi.org/10.1016/j.ijleo.2009.01.012.

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39

Tao, Tao, Jing Li e Yang Lin. "Three Dimensional Manipulation of Cells Using Holographic Optical Tweezers". Applied Mechanics and Materials 241-244 (dicembre 2012): 513–16. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.513.

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Abstract (sommario):

A holographic optical tweezers platform was built and a multi-plane adaptive-additive algorithm was used to generating holograms for the reconstruction of optical traps in three-dimensional (3D) spaces. Experiments of manipulating cells were conducted on such platform and complex 3D structures were built with yeast cells. The results demonstrate that holographic optical tweezers can manipulate groups of cells in three dimensions and effectively trap and separate cells in the direction of the optic axis without harming the cells. Based on those versatile functions, it is proved that holographic optical tweezers is a powerful tool for single cell analysis.

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40

Vizsnyiczai, Gaszton, Lóránd Kelemen e Pál Ormos. "Holographic multi-focus 3D two-photon polymerization with real-time calculated holograms". Optics Express 22, n. 20 (25 settembre 2014): 24217. http://dx.doi.org/10.1364/oe.22.024217.

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41

Cai, Wenjian, Timothy D. Gerke, Theodore J. Reber, Ariel Libertun e Rafael Piestun. "Computer-Generated Volume Holograms Optimize Degrees of Freedom in 3D Aperiodic Structures". Optics and Photonics News 17, n. 12 (1 dicembre 2006): 26. http://dx.doi.org/10.1364/opn.17.12.000026.

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42

Tao Tao, Tao Tao, Jing Li Jing Li, Qian Long Qian Long e Xiaoping Wu Xiaoping Wu. "3D trapping and manipulation of micro-particles using holographic optical tweezers with optimized computer-generated holograms". Chinese Optics Letters 9, n. 12 (2011): 120010–13. http://dx.doi.org/10.3788/col201109.120010.

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43

Pabon-R, Dudbil O., e Jorge-Enrique Rueda-P. "Video holográfico en el dominio de Fresnel, objetos 3D". BISTUA REVISTA DE LA FACULTAD DE CIENCIAS BASICAS 14, n. 1 (4 maggio 2016): 32. http://dx.doi.org/10.24054/01204211.v1.n1.2016.1935.

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Abstract (sommario):

Generamos Video-Holográfico en el dominio de Fresnel y para objetos de volumen en movimiento. Implementamos un arreglo óptico tipo Mach-Zenhder y desarrollamos la herramienta computacional HDFresnel_V1.exe. Esta herramienta permite registrar y reconstruir hologramas, mejorar la calidad del holograma reconstruido, y generar video-hologramas.

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44

Lee, Chung-Fei, Wei-Feng Hsu, Tzu-Hsuan Yang e Ren-Jei Chung. "Three-Dimensional (3D) Printing Implemented by Computer-Generated Holograms for Generation of 3D Layered Images in Optical Near Field". Photonics 8, n. 7 (19 luglio 2021): 286. http://dx.doi.org/10.3390/photonics8070286.

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Abstract (sommario):

Photocurable three-dimensional (3D) printing is a stepwise layer-by-layer fabrication process widely used in the manufacture of highly specialized objects. Current 3D printing techniques are easily implemented; however, the build rate is slow and the surface quality is less than ideal. Holographic 3D display (3DHD) technology makes it possible to reform planar wavefronts into a 3D intensity distribution, which appears as a 3D image in space. This paper examined the application of holographic imaging technology to 3D printing based on photocurable polymers. The proposed system uses a 3DHD diffractive optics system based on a liquid-crystal-on-silicon spatial light modulator (LCoS-SLM), wherein a 3D layered image is created in the optical near field, based on a computer-generated hologram (CGH) optimized using the iterative angular spectrum algorithm (IASA) and a circular IASA. From a single CGH, multiple 2D sliced images are created in space to form a 3D optical image used to initiate the photopolymerization of photocurable resin to form 3D objects. In experiments, the proposed 3D printing system was used to create five polymer objects with a maximum axial length of 25 mm and minimum feature width of 149 μm. The phase-only CGH reformed the incident light into a distribution of optical intensity with high diffraction efficiency suitable for photocuring. Despite limitations pertaining to fabrication area and axial complexity in this initial study, the proposed method demonstrated high light efficiency, high resolution in the lateral direction, rapid fabrication, and good object continuity.

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45

Martinez-Carranza, Juan, Tomasz Kozacki, Rafał Kukołowicz, Maksymilian Chlipala e Moncy Sajeev Idicula. "Occlusion Culling for Wide-Angle Computer-Generated Holograms Using Phase Added Stereogram Technique". Photonics 8, n. 8 (27 luglio 2021): 298. http://dx.doi.org/10.3390/photonics8080298.

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Abstract (sommario):

A computer-generated hologram (CGH) allows synthetizing view of 3D scene of real or virtual objects. Additionally, CGH with wide-angle view offers the possibility of having a 3D experience for large objects. An important feature to consider in the calculation of CGHs is occlusion between surfaces because it provides correct perception of encoded 3D scenes. Although there is a vast family of occlusion culling algorithms, none of these, at the best of our knowledge, consider occlusion when calculating CGHs with wide-angle view. For that reason, in this work we propose an occlusion culling algorithm for wide-angle CGHs that uses the Fourier-type phase added stereogram (PAS). It is shown that segmentation properties of the PAS can be used for setting efficient conditions for occlusion culling of hidden areas. The method is efficient because it enables processing of dense cloud of points. The investigated case has 24 million of point sources. Moreover, quality of the occluded wide-angle CGHs is tested by two propagation methods. The first propagation technique quantifies quality of point reproduction of calculated CGH, while the second method enables the quality assessment of the occlusion culling operation over an object of complex shape. Finally, the applicability of proposed occlusion PAS algorithm is tested by synthetizing wide-angle CGHs that are numerically and optically reconstructed.

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46

Hao Zhang, 张浩, 谢敬辉 Jinghui Xie, 刘娟 Juan Liu e 王涌天 Yongtian Wang. "Optical reconstruction of 3D images by use of pure-phase computer-generated holograms". Chinese Optics Letters 7, n. 12 (2009): 1101–3. http://dx.doi.org/10.3788/col20090712.1101.

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47

Haist, T., M. Schönleber e H. J. Tiziani. "Computer-generated holograms from 3D-objects written on twisted-nematic liquid crystal displays". Optics Communications 140, n. 4-6 (agosto 1997): 299–308. http://dx.doi.org/10.1016/s0030-4018(97)00192-2.

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48

Nagashima, Kenji. "Improvement of reconstruction in 3D computer-generated holograms using 1D Fourier transform operations". Optics & Laser Technology 33, n. 5 (luglio 2001): 329–34. http://dx.doi.org/10.1016/s0030-3992(01)00037-8.

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49

Zhang, Jun, Yang Yang, Benpeng Zhu, Xiangjia Li, Jie Jin, Zeyu Chen, Yong Chen e Qifa Zhou. "Multifocal point beam forming by a single ultrasonic transducer with 3D printed holograms". Applied Physics Letters 113, n. 24 (10 dicembre 2018): 243502. http://dx.doi.org/10.1063/1.5058079.

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50

Choi, Kyongsik, Hwi Kim e Byoungho Lee. "Full-color autostereoscopic 3D display system using color-dispersion-compensated synthetic phase holograms". Optics Express 12, n. 21 (18 ottobre 2004): 5229. http://dx.doi.org/10.1364/opex.12.005229.

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