Статті в журналах з теми "3D holographic image"
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1
Iano, Randrianasoa, and Randriamaroson Mahandrisoa. "Enhancing Real-Time Pyramid Holographic Display Through Iterative Algorithm Optimization for 3D Image Reconstruction." American Journal of Optics and Photonics 12, no. 1 (April 29, 2024): 9–17. http://dx.doi.org/10.11648/j.ajop.20241201.12.
Анотація:
Holography, a crucial technology for 3D visualization, strives to create realistic relief images. This research aims to enhance hologram quality and viewer experience by optimizing the image-processing pipeline. Conventional holographic displays face challenges due to their bulkiness and limited viewing angles. To overcome these limitations, this study proposes a novel approach that integrates digital holography with holographic pyramid technology. Digital holography uses computer algorithms for hologram generation, while holographic pyramid technology projects images onto a reflective pyramid for 3D display. The drawback of holographic pyramid displays in low-light environments is addressed through increased diffraction to enhance image resolution. This integrated approach involves comprehensive research, including an examination of existing methods. The anticipated outcome is holograms with improved visibility and resolution from multiple angles. The research presents an initial image preprocessing phase, succeeded by sophisticated processing employing iterative algorithms. This aims to diminish the image size while upholding its quality, thereby achieving an image suitable for pyramidal display. The fusion of digital holography and holographic pyramid display shows promise for immersive visual experiences. However, advancements in processing techniques may lead to increased material complexity, posing a challenge. Through this research, the system aims to unlock creative potentials and pave the way for enhanced holographic displays in various applications.
2
Shoydin, S. A. "Synthesis of holograms received by a communication channel." Computer Optics 44, no. 4 (August 2020): 547–51. http://dx.doi.org/10.18287/2412-6179-co-694.
Анотація:
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.
3
Tyshchenko, I. A., and V. E. Kraskevich. "Holographic technologies as a way to attract investments." Mathematical machines and systems 3 (2022): 70–76. http://dx.doi.org/10.34121/1028-9763-2022-3-70-76.
Анотація:
The purpose of the work is to research and formalize the methods of conveying visual information at presentations and the expediency of using modern information technologies for the visualization of presentation objects. The object of the research and comparison is the information technology of holographic 3D showcases and the holographic 3D showcase itself as a modern device for the virtualization of static and dynamic objects as well as the addition of real objects that meet the size criteria set by the developer, by creating augmented reality without using mobile applications and smartphone cameras. Holographic technologies and methods of holography are analyzed in the article. The use of holography is due to the increase in realistic advertising, the introduction of new information technologies in society, and the increase in the demands of society for multimedia devices. Methods of presenting holographic technologies can be considered information technologies for creating presentation applications that are used to display 3D holographic presentations. The concepts and features of 3D images are revealed. Achieving the realism of the presented information is possible only by creating three-dimensional images that will be placed in space. Dynamic images allow the authors to fully convey their ideas and create the effect of the presence of a real prototype of the product at the presentation. Since the device does not have visible elements of the display of the image, the viewer has no doubts about what he sees. Creation technologies were analyzed and a comparison of 2D and 3D holography was made. It is shown that each of the technologies has its own characteristics and makes it possible to use a holographic 3D showcase as a full-fledged substitute for the screen. Technological features allow using a hologram as a transparent monitor screen which provides new opportunities for demonstration and visualization of goods.
4
Tahara, Tatsuki, Reo Otani, and 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, no. 12 (November 28, 2018): 2410. http://dx.doi.org/10.3390/app8122410.
Анотація:
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.
5
Ren, Haoran, Wei Shao, Yi Li, Flora Salim, and Min Gu. "Three-dimensional vectorial holography based on machine learning inverse design." Science Advances 6, no. 16 (April 2020): eaaz4261. http://dx.doi.org/10.1126/sciadv.aaz4261.
Анотація:
The three-dimensional (3D) vectorial nature of electromagnetic waves of light has not only played a fundamental role in science but also driven disruptive applications in optical display, microscopy, and manipulation. However, conventional optical holography can address only the amplitude and phase information of an optical beam, leaving the 3D vectorial feature of light completely inaccessible. We demonstrate 3D vectorial holography where an arbitrary 3D vectorial field distribution on a wavefront can be precisely reconstructed using the machine learning inverse design based on multilayer perceptron artificial neural networks. This 3D vectorial holography allows the lensless reconstruction of a 3D vectorial holographic image with an ultrawide viewing angle of 94° and a high diffraction efficiency of 78%, necessary for floating displays. The results provide an artificial intelligence–enabled holographic paradigm for harnessing the vectorial nature of light, enabling new machine learning strategies for holographic 3D vectorial fields multiplexing in display and encryption.
6
He, Zehao, Xiaomeng Sui, and Liangcai Cao. "Holographic 3D Display Using Depth Maps Generated by 2D-to-3D Rendering Approach." Applied Sciences 11, no. 21 (October 22, 2021): 9889. http://dx.doi.org/10.3390/app11219889.
Анотація:
Holographic display has the potential to be utilized in many 3D application scenarios because it provides all the depth cues that human eyes can perceive. However, the shortage of 3D content has limited the application of holographic 3D displays. To enrich 3D content for holographic display, a 2D to 3D rendering approach is presented. In this method, 2D images are firstly classified into three categories, including distant view images, perspective view images and close-up images. For each category, the computer-generated depth map (CGDM) is calculated using a corresponding gradient model. The resulting CGDMs are applied in a layer-based holographic algorithm to obtain computer-generated holograms (CGHs). The correctly reconstructed region of the image changes with the reconstruction distance, providing a natural 3D display effect. The realistic 3D effect makes the proposed approach can be applied in many applications, such as education, navigation, and health sciences in the future.
7
Wu, Taihui, Jianshe Ma, Chengchen Wang, Haibei Wang, and Ping Su. "Full-Color See-Through Three-Dimensional Display Method Based on Volume Holography." Sensors 21, no. 8 (April 11, 2021): 2698. http://dx.doi.org/10.3390/s21082698.
Анотація:
We propose a full-color see-through three-dimensional (3D) display method based on volume holography. This method is based on real object interference, avoiding the device limitation of spatial light modulator (SLM). The volume holography has a slim and compact structure, which realizes 3D display through one single layer of photopolymer. We analyzed the recording mechanism of volume holographic gratings, diffraction characteristics, and influencing factors of refractive index modulation through Kogelnik’s coupled-wave theory and the monomer diffusion model of photopolymer. We built a multiplexing full-color reflective volume holographic recording optical system and conducted simultaneous exposure experiment. Under the illumination of white light, full-color 3D image can be reconstructed. Experimental results show that the average diffraction efficiency is about 53%, and the grating fringe pitch is less than 0.3 μm. The reconstructed image of volume holography has high diffraction efficiency, high resolution, strong stereo perception, and large observing angle, which provides a technical reference for augmented reality.
8
Choi, Suyeon, Manu Gopakumar, Yifan Peng, Jonghyun Kim, and Gordon Wetzstein. "Neural 3D holography." ACM Transactions on Graphics 40, no. 6 (December 2021): 1–12. http://dx.doi.org/10.1145/3478513.3480542.
Анотація:
Holographic near-eye displays promise unprecedented capabilities for virtual and augmented reality (VR/AR) systems. The image quality achieved by current holographic displays, however, is limited by the wave propagation models used to simulate the physical optics. We propose a neural network-parameterized plane-to-multiplane wave propagation model that closes the gap between physics and simulation. Our model is automatically trained using camera feedback and it outperforms related techniques in 2D plane-to-plane settings by a large margin. Moreover, it is the first network-parameterized model to naturally extend to 3D settings, enabling high-quality 3D computer-generated holography using a novel phase regularization strategy of the complex-valued wave field. The efficacy of our approach is demonstrated through extensive experimental evaluation with both VR and optical see-through AR display prototypes.
9
Ping, Guo. "Real Three-Dimensional Image Projection System Based on the Volumetric 3D Display Principles and the WPF Framework." Applied Mechanics and Materials 427-429 (September 2013): 1436–39. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.1436.
Анотація:
The real projection system image of 3D Rotating cones based on the Volumetric 3D revelation principle and WPF platform is the true image. Compared with conventional 3D display, this system has the naked eye 3D display, so the viewer is no need to wear 3D glasses and 3D display can be achieved .At the same time, this system has a 360-degree holographic image display. The system is designed by using WPF 3D image, which makes it easy to produce 3D images.
10
Eom, Junseong, and Sangjun Moon. "Three-Dimensional High-Resolution Digital Inline Hologram Reconstruction with a Volumetric Deconvolution Method." Sensors 18, no. 9 (September 3, 2018): 2918. http://dx.doi.org/10.3390/s18092918.
Анотація:
The digital in-line holographic microscope (DIHM) was developed for a 2D imaging technology and has recently been adapted to 3D imaging methods, providing new approaches to obtaining volumetric images with both a high resolution and wide field-of-view (FOV), which allows the physical limitations to be overcome. However, during the sectioning process of 3D image generation, the out-of-focus image of the object becomes a significant impediment to obtaining evident 3D features in the 2D sectioning plane of a thick biological sample. Based on phase retrieved high-resolution holographic imaging and a 3D deconvolution technique, we demonstrate that a high-resolution 3D volumetric image, which significantly reduces wave-front reconstruction and out-of-focus artifacts, can be achieved. The results show a 3D volumetric image that is more finely focused compared to a conventional 3D stacked image from 2D reconstructed images in relation to micron-size polystyrene beads, a whole blood smear, and a kidney tissue sample. We believe that this technology can be applicable for medical-grade images of smeared whole blood or an optically cleared tissue sample for mobile phytological microscopy and laser sectioning microscopy.
11
Lee, Hyoung, Wookho Son, Minseok Kim, Yongjin Yoon, and MinSung Yoon. "Near-Eye Holographic 3D Display and Advanced Amplitude-Modulating Encoding Scheme for Extended Reality." Applied Sciences 13, no. 6 (March 15, 2023): 3730. http://dx.doi.org/10.3390/app13063730.
Анотація:
Electronic holographic displays can reconstruct the optical wavefront of object light, exhibiting the most realistic three-dimensional (3D) images, in contrast to conventional stereoscopic displays. In this paper, we propose a novel, near-eye holographic 3D display (NEHD) applicable to AR/MR/holographic devices and experimentally demonstrate the proposed module’s performance with 360° full-viewed holographic 3D movie at 30 fps. To realize high-quality of reconstructed holographic 3D (H3D) images, we also propose an advanced amplitude-modulating (AM) encoding scheme suited for the proposed amplitude-modulating NEHD. We experimentally verify that the new hologram-encoding approach can improve the image quality of H3D reconstructions through quantitative statistical analyses, by using evaluation methods for H3D images that are suggested in the paper. Two holograms at different viewing directions of the same 3D scene are designed to be displayed onto the proposed NEHD prototype for two eyes of an observer, respectively. The presented techniques for the proposed NEHD enable the observer to experience the depth cue, a realistic accommodation effect, and high-quality H3D movies at each eye.
12
Zhao, Wu-Xiang, Han-Le Zhang, Qing-Lin Ji, Huan Deng, and Da-Hai Li. "Aerial Projection 3D Display Based on Integral Imaging." Photonics 8, no. 9 (September 9, 2021): 381. http://dx.doi.org/10.3390/photonics8090381.
Анотація:
We proposed an aerial projection 3D display based on integral imaging. It is composed of a projector, a lens-array holographic optical element (HOE), and two parabolic mirrors. The lens-array HOE is a diffraction grating and is made by the volume holography technique. The lens-array HOE can be produced on a thin glass plate, and it has the optical properties of a lens array when the Bragg condition is satisfied. When the display beams of the element image array (EIA) are projected on the lens-array HOE, 3D images can be reconstructed. The two parabolic mirrors can project 3D images into the air. The Bragg-unmatched light simply passes through the lens-array HOE. Therefore, the aerial projection 3D images appear to be imaged in the air without any medium. In the experiment, a BenQ projector was used for the projection of 3D images, with a resolution of 1600 × 1200. The diameter and the height of each parabolic mirror are 150 mm and 25 mm, respectively. The inner diameter of the parabolic mirror is 40 mm. The 3D images were projected in the air, and the experimental results prove the correctness of our display system.
13
Tang, Taixiang, and Huihua Zhang. "An Interactive Holographic Multimedia Technology and Its Application in the Preservation and Dissemination of Intangible Cultural Heritage." International Journal of Digital Multimedia Broadcasting 2023 (October 31, 2023): 1–13. http://dx.doi.org/10.1155/2023/6527345.
Анотація:
Digital technology offers numerous advantages, such as preserving the authenticity, replicating reality, and facilitating dissemination. It enables the preservation of intangible cultural heritage (ICH) in its original form and allows for the creation of comprehensive graphic, audio, and visual databases. Among these technologies, holographic technology holds promise for protecting ICH and promoting its dissemination. This paper focuses on interactive holographic technology and presents the design and implementation of a dynamic holographic display system that combines digital hologram (DH) and computer-generated hologram (CGH) to showcase 3D images consisting of both virtual and real objects. Real-time loading of DH into a spatial light modulator enables the optical reproduction of real objects, while the loading of two CGHs into other spatial light modulators facilitates the optical reproduction of virtual objects. Computational holography allows for the addition of virtual information, such as coordinate text, and the fusion of the three reconstructed images in space, resulting in an augmented reality experience and enhanced 3D display of real objects. An experimental setup employing three liquid crystal on silicon (LCOS) devices confirms the validity of the proposed method. Compared to other techniques, this approach demonstrates improved image signal-to-noise ratio, reduced alignment errors, and wider coverage of light traversal for laser 3D reconstruction images. The holographic technology presented in this paper enables the fusion display of real and virtual scenes and real-time two-way interaction between the audience and virtual images. This research holds significant practical value in promoting the effective dissemination and protection of ICH.
14
Kim, Jeonghun, Bhimrao D. Sarwade, Hyunjin Oh, Eunkyoung Kim, and Sang-Goo Lee. "3D Image Recording on Photopolymer Films Containing Molecular Composites of a New s-Triazine Monomer and Acrylate Monomer by Dual Photopolymerization." Journal of Nanoscience and Nanotechnology 8, no. 9 (September 1, 2008): 4702–6. http://dx.doi.org/10.1166/jnn.2008.ic77.
Анотація:
Three dimensional (3D) image recording on photopolymer film was explored using a mixture of s-triazine diepoxy (SEP) and ethylene glycol phenyl ether acrylate (PA) as a monomer to induce cationic and radical polymerization during the holographic recording. The photopolymer films were sensitive to a visible light source and polymerized upon excitation with a visible laser. 3D image was recorded on the photopolymer film by holographic recording using a 491 nm laser. The film containing a molecular composite of SEP and PA showed high diffraction efficiency via dual photo polymerization. Within 10 min of recording the image formation was vivid. In this way 3D screw and a letter image with large viewing angle were obtained onto the photopolymer film. The images were stable for longer than 3 month at RT and 5 hr at 85 °C, when read by a visible light.
15
Kelly, Damien P., David S. Monaghan, Nitesh Pandey, Tomasz Kozacki, Aneta Michałkiewicz, Grzegorz Finke, Bryan M. Hennelly, and 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.
Анотація:
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.
16
Zhang, Hao, Liangcai Cao, and Guofan Jin. "Scaling of Three-Dimensional Computer-Generated Holograms with Layer-Based Shifted Fresnel Diffraction." Applied Sciences 9, no. 10 (May 24, 2019): 2118. http://dx.doi.org/10.3390/app9102118.
Анотація:
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.
17
Shoydin, Sergey A., and Artem L. Pazoev. "Transmission of 3D Holographic Information via Conventional Communication Channels and the Possibility of Multiplexing in the Implementation of 3D Hyperspectral Images." Photonics 8, no. 10 (October 15, 2021): 448. http://dx.doi.org/10.3390/photonics8100448.
Анотація:
This paper shows the possibility of transmitting 3D holographic information in real time with a TV frame rate over conventional radio channels by transmitting two two-dimensional signals in two image modes: depth map and surface texture of the object (mask + texture). The authors point out that it is similar to compression through eliminating the carrier and it is inherently similar to SSB (single-sideband modulation) but has higher resolution ability in reconstructing 3D images. It is also shown that such technology for transmitting 3D holographic information is in good agreement with the tasks of both aggregating and multiplexing 3D images when they are transferred from one part of the electromagnetic spectrum of radiation to another and the creation of hyperspectral 3D images.
18
Tu, Kefeng, Qiyang Chen, Zi Wang, Guoqiang Lv, and Qibin Feng. "Depth-Enhanced Holographic Super Multi-View Maxwellian Display Based on Variable Filter Aperture." Micromachines 14, no. 6 (May 31, 2023): 1167. http://dx.doi.org/10.3390/mi14061167.
Анотація:
The super multi-view (SMV) near-eye display (NED) effectively provides depth cues for three-dimensional (3D) displays by projecting multiple viewpoint images or parallax images onto the retina simultaneously. Previous SMV NED suffers from a limited depth of field (DOF) due to the fixed image plane. Aperture filtering is widely used to enhance the DOF; however, an invariably sized aperture may have opposite effects on objects with different reconstruction depths. In this paper, a holographic SMV display based on the variable filter aperture is proposed to enhance the DOF. In parallax image acquisition, multiple groups of parallax images, each group recording a part of the 3D scene on a fixed depth range, are captured first. In the hologram calculation, each group of wavefronts at the image recording plane (IRP) is calculated by multiplying the parallax images with the corresponding spherical wave phase. Then, they are propagated to the pupil plane and multiplied by the corresponding aperture filter function. The size of the filter aperture is variable which is determined by the depth of the object. Finally, the complex amplitudes at the pupil plane are back-propagated to the holographic plane and added together to form the DOF-enhanced hologram. Simulation and experimental results verify the proposed method could improve the DOF of holographic SMV display, which will contribute to the application of 3D NED.
19
Brito Carcaño, Jesús E., Stéphane Cuenat, Belal Ahmad, Patrick Sandoz, Raphaël Couturier, Guillaume Laurent, and Maxime Jacquot. "Digital holographic microscopy applied to 3D computer microvision by using deep neural networks." EPJ Web of Conferences 287 (2023): 13011. http://dx.doi.org/10.1051/epjconf/202328713011.
Анотація:
Deep neural networks are increasingly applied in many branches of applied science such as computer vision and image processing by increasing performances of instruments. Different deep architectures such as convolutional neural networks or Vision Transformers can be used in advanced coherent imaging techniques such as digital holography to extract various metrics such as autofocusing reconstruction distance or 3D position determination in order to target automated microscopy or real-time phase image restitution. Deep neural networks can be trained with both datasets simulated and experimental holograms, by transfer learning. Overall, the application of deep neural networks in digital holographic microscopy and 3D computer micro-vision has the potential to significantly improve the robustness and processing speed of holograms to infer and control a 3D position for applications in micro-robotics.
20
Shoydin, Sergey A., and Artem L. Pazoev. "CORRECTION OF PROJECTIVE DEFORMATIONS OF 3D OBJECT, ON THE STAGE OF HOLOGRAM FORMATION." Interexpo GEO-Siberia 8, no. 1 (July 8, 2020): 97–107. http://dx.doi.org/10.33764/2618-981x-2020-8-1-97-107.
Анотація:
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.
21
Shoydin, Sergey A., and Artem L. Pazoev. "«Uncanny valley» effect in holographic image transmission." Journal of the Belarusian State University. Physics, no. 3 (October 20, 2022): 4–9. http://dx.doi.org/10.33581/2520-2243-2022-3-4-9.
Анотація:
The quality of computer-synthesised images is continuously improving, increasing in the volume of files representing them. It is noticed that passing from simple schematic images to increasingly complex ones, their perception goes through different stages. If initially the complication of the image and its approximation to the real image of a person makes a favourable impression, then there comes a moment of fright and rejection. Masahiro Mori called it the «uncanny valley» effect. Since then, all new technologies for presenting human images have been tested in order to avoid this effect. This effect should be treated especially carefully when compressing and then restoring complex images. This paper shows the position relative to the «uncanny valley» of the reconstructed 3D images, reconstructed by a hologram synthesised and transmitted with compression over the communication channel in accordance with patent RU2707582C1.
22
Shoydin, Sergey Alexandrovich, and Artem Levonovich Pazoev. "Structured Light Patterns Work Like a Hologram." Applied Sciences 13, no. 6 (March 22, 2023): 4037. http://dx.doi.org/10.3390/app13064037.
Анотація:
The subject of this investigation is light diffraction from a structure formed at the lateral projection of structured light on the surface of a 3D object. It is demonstrated that the patterns of vertically structured light fringes change their structure during the lateral illumination of a 3D object, and take on the properties of holograms. The diffraction of light from this structure forms several diffraction orders, and one of them can restore the image of the 3D object. Results of the numerical experiment demonstrating the possibility to restore 3D holographic images by these patterns at a wavelength corresponding to Bragg conditions are presented. The obtained result allows an order of magnitude higher compression of the holographic information about a 3D object to be transmitted along the communication channel, in a volume that is sufficient for visual perception, and for the observation of both the horizontal and vertical continuous parallax. Results of the experiments on the transmission of this compressed information are presented to demonstrate that the TV frame rate frequency of the 3D holographic video sequence is quite achievable.
23
Pazoev, Artem L., and Sergey A. Shoydin. "TRANSMISSION OF HOLOGRAPHIC INFORMATION ON A SINGLE SIDEBAND." Interexpo GEO-Siberia 8 (May 21, 2021): 109–17. http://dx.doi.org/10.33764/2618-981x-2021-8-109-117.
Анотація:
When holographic information is transmitted through communication channels, a problem arises associated with the large capacity of holograms. In the patent of the Russian Federation No. 2707582, the possibility of compressing holographic information was shown, similar to the transmission on one sideband known in radio electronics. The experimental transmission of such compressed information over a Wi-Fi wireless communication channel with a frame rate of more than 25 frames per second is shown in this paper. The experiment of transmitting holographic information of 3D images over a wireless Wi-Fi communication channel to simulate 3D video using the FTP protocol was carried out. In accordance with the RF patent No. 2707582, each transmitted frame of a 3D image was the sum of two 2D frames-a texture (2000x2000 pixels) and a mask (1000x1000 pixels). To simulate the transmission of a video sequence, packets of 500 double frames were transmitted simultaneously. The transmission times of these frame packets measured in real time by FileZilla showed that the transmission of full holographic information about a 3D object in real time with a frame rate greater than 25 frames / sec. quite feasible.
24
Kozacki, Tomasz. "On resolution and viewing of holographic image generated by 3D holographic display." Optics Express 18, no. 26 (December 9, 2010): 27118. http://dx.doi.org/10.1364/oe.18.027118.
25
Kim, Hakdong, Heonyeong Lim, Minkyu Jee, Yurim Lee, MinSung Yoon, and Cheongwon Kim. "High-Precision Depth Map Estimation from Missing Viewpoints for 360-Degree Digital Holography." Applied Sciences 12, no. 19 (September 20, 2022): 9432. http://dx.doi.org/10.3390/app12199432.
Анотація:
In this paper, we propose a novel model to extract highly precise depth maps from missing viewpoints, especially for generating holographic 3D content. These depth maps are essential elements for phase extraction, which is required for the synthesis of computer-generated holograms (CGHs). The proposed model, called the holographic dense depth, estimates depth maps through feature extraction, combining up-sampling. We designed and prepared a total of 9832 multi-view images with resolutions of 640 × 360. We evaluated our model by comparing the estimated depth maps with their ground truths using various metrics. We further compared the CGH patterns created from estimated depth maps with those from ground truths and reconstructed the holographic 3D image scenes from their CGHs. Both quantitative and qualitative results demonstrate the effectiveness of the proposed method.
26
SALDIN, D. K. "HOLOGRAPHIC CRYSTALLOGRAPHY FOR SURFACE STUDIES: A REVIEW OF THE BASIC PRINCIPLES." Surface Review and Letters 04, no. 03 (June 1997): 441–57. http://dx.doi.org/10.1142/s0218625x97000432.
Анотація:
In this paper, we review the basic principles of the technique of holographic crystallography (HXT) for surface studies. We discuss the appropriateness of the use of the term "holography" in this field in the light of its relation to other branches of that subject. We compare the effects of multiple scattering and the anisotropies of the reference and object waves on the computer reconstruction of images in HXT. We note that the twin-image problem of conventional holography is a direct consequence of the fact that the hologram is recorded on a two-dimensional surface. Like optical volume holography, which overcomes this problem by recording a diffraction pattern on a thick photographic emulsion, multienergy HXT does so by recording the pattern in a volume of reciprocal space. We consider the relative merits of different reconstruction algorithms, particularly proposals for reducing the deleterious effects of the anisotropies of the reference and object waves. We urge the use of techniques of modern computer graphics to render to full effect the striking 3D images reconstructed.
27
Wang, Zimu, Yilong Li, Zhenyan Tang, Zhaosong Li, and Di Wang. "Fast Hologram Calculation Method Based on Wavefront Precise Diffraction." Micromachines 14, no. 9 (August 29, 2023): 1690. http://dx.doi.org/10.3390/mi14091690.
Анотація:
In this paper, a fast hologram calculation method based on wavefront precise diffraction is proposed. By analyzing the diffraction characteristics of the object point on the 3D object, the effective viewing area of the reproduced image is analyzed. Based on the effective viewing area, the effective hologram size of the object point is obtained, and then the accurate diffraction calculation from the object point to the wavefront recording plane (WRP) is performed. By calculating all the object points on the recorded object, the optimized WRP of the whole 3D object can be obtained. The final hologram is obtained by calculating the diffraction light field from the WRP to the holographic plane. Compared with the traditional method, the proposed method can improve the calculation speed by more than 55%, while the image quality of the holographic 3D display is not affected. The proposed calculation method provides an idea for fast calculation of holograms and is expected to contribute to the development of dynamic holographic displays.
28
Wang, Lulu. "Three-Dimensional Holographic Electromagnetic Imaging for Accessing Brain Stroke." Sensors 18, no. 11 (November 9, 2018): 3852. http://dx.doi.org/10.3390/s18113852.
Анотація:
The authors recently developed a two-dimensional (2D) holographic electromagnetic induction imaging (HEI) for biomedical imaging applications. However, this method was unable to detect small inclusions accurately. For example, only one of two inclusions can be detected in the reconstructed image if the two inclusions were located at the same XY plane but in different Z-directions. This paper provides a theoretical framework of three-dimensional (3D) HEI to accurately and effectively detect inclusions embedded in a biological object. A numerical system, including a realistic head phantom, a 16-element excitation sensor array, a 16-element receiving sensor array, and image processing model has been developed to evaluate the effectiveness of the proposed method for detecting small stroke. The achieved 3D HEI images have been compared with 2D HEI images. Simulation results show that the 3D HEI method can accurately and effectively identify small inclusions even when two inclusions are located at the same XY plane but in different Z-directions. This preliminary study shows that the proposed method has the potential to develop a useful imaging tool for the diagnosis of neurological diseases and injuries in the future.
29
Lee, Chung-Fei, Wei-Feng Hsu, Tzu-Hsuan Yang, and Ren-Jei Chung. "Three-Dimensional (3D) Printing Implemented by Computer-Generated Holograms for Generation of 3D Layered Images in Optical Near Field." Photonics 8, no. 7 (July 19, 2021): 286. http://dx.doi.org/10.3390/photonics8070286.
Анотація:
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.
30
Li, Jun-Hua, Han-Le Zhang, Qing-Lin Ji, and Wu-Xiang Zhao. "Distortion-Corrected Integral Imaging 3D Display System Based on Lens Array Holographic Optical Element." Symmetry 14, no. 7 (July 20, 2022): 1481. http://dx.doi.org/10.3390/sym14071481.
Анотація:
We propose a distortion-corrected integral imaging (II) 3D display system based on lens array holographic optical element (LAHOE). The LAHOE is used as a projection screen. The projection beam of the LAHOE is parallel light. Hence, the projection system consists of a spatial light modulator, a reverse projection lens, a relay optical element, and a telecentric lens. The acquired 3D data and the reconstructed 3D image of II are symmetrically related to each other. Therefore, there is lens distortion in the projection system. To avoid affecting the viewing experience of the viewers, the elemental image array (EIA) is projected obliquely on the LAHOE, causing the lateral distortion of the EIA. There is a position deviation in the projection system, so the projected EIA has geometric deformation. Due to the distortion of the EIA, it is difficult to precisely align the projected EIA and LAHOE, which results in serious flip of the reconstructed 3D images. The distortion of the EIA affects the asymmetry of the 3D image reconstruction. Lens distortion can be solved by the distortion compensation method. Lateral and the geometric deformation can be solved by the perspective transformations in computer graphics. After correction, the undistorted EIA is projected, and the projected EIA on the LAHOE has little distortion. In the process of 3D image reconstruction, the causes of asymmetry affecting 3D image reconstruction are analyzed, and the issues that generate these asymmetric factors are addressed. Experimental results indicate that a better 3D display effect is achieved.
31
Liu, Yulong, Shan Wu, Qi Xu, and Hubin Liu. "Holographic Projection Technology in the Field of Digital Media Art." Wireless Communications and Mobile Computing 2021 (May 18, 2021): 1–12. http://dx.doi.org/10.1155/2021/9997037.
Анотація:
The advent of the digital age has given new forms and new connotations to artistic creation, and more and more digital media technologies have entered the stage of artistic creation and exhibitions. At present, holographic projection technology has become a hot application technology in the field of digital media art. The purpose of this paper is to explore the technical principles of holographic projection technology and its application in the field of digital media art, so as to provide suggestions for the application and promotion of holographic projection technology and the development and innovation of digital media art. First of all, this article understands the technical principles of holographic projection and its application status in various fields, especially in the field of digital media art, through relevant literature research. Then, this article introduces the digital holographic technology, virtual imaging technology, and computer simulation technology used in the realization of holographic projection technology. Then, based on the advantages of holographic projection technology in three-dimensional image recording and reproduction, this paper proposes to introduce holographic projection technology to digital art museums, digital art exhibitions, and other digital media art applications and to study the effect of holographic projection technology on art through simulation experiments, the effect of recording and reproducing the image of the work. Finally, the three-dimensional reconstruction image of the digital holographic projection experiment on the artwork is compared with the simulated image of the Contour GT profiler to verify the feasibility of applying the holographic projection technology to art exhibitions and the effect of three-dimensional image recording and reproduction. Research shows that the holographic projection technology can achieve 93.34% of the simulation effect of recording and reproducing 3D images of artworks. It is also found that 59.86% of the audience who pay attention to the art experience strongly support the application of holographic projection technology in digital media art fields such as digital art gallery. This fully proves the feasibility of applying holographic projection technology to digital art exhibitions and provides a full range of artistic experience for audiences who cannot be present.
32
Zheng, Huadong, Jianbin Hu, Chaojun Zhou, and Xiaoxi Wang. "Computing 3D Phase-Type Holograms Based on Deep Learning Method." Photonics 8, no. 7 (July 15, 2021): 280. http://dx.doi.org/10.3390/photonics8070280.
Анотація:
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.
33
Takaki, Yasuhiro. "Enlargements of Viewing Zone and Screen Size of Holographic Displays Using MEMS SLM Combined with Scanning Systems." Applied Sciences 12, no. 13 (June 27, 2022): 6495. http://dx.doi.org/10.3390/app12136495.
Анотація:
The problems of conventional holographic display techniques, which are the requirements of a sub-micron pixel pitch and ultra-high resolution for spatial light modulators (SLMs) to enlarge the viewing zone and screen size, can be addressed using microelectromechanical systems (MEMS) SLMs combined with spatial scanning systems. Various scanning systems have been efficiently combined with high-speed image generation of MEMS SLMs based on the time-multiplexing technique. The horizontal scanning system enlarged the viewing zone and screen size, the circular scanning system provided 360° three-dimensional (3D) images, and the RGB scanning system generated color 3D images. The screen size can be increased scalably using a multichannel system based on the space-multiplexing technique. The use of a short laser pulse illumination system eliminates the mechanical scanning system and greatly simplifies the display system. The measurements of the accommodation responses of human eyes showed that 3D images generated by the screen scanning holographic display have a possibility to solve the visual fatigue issue caused by the vergence–accommodation conflict, which prevents the long-time usage of conventional 3D displays.
34
Chen, Chien-Yu, Chih-Hao Chuang, Hoang-Yan Lin, and Ding-Yu Zhuo. "Imaging evaluation of computer-generated hologram by using three-dimensional modified structural similarity index." Journal of Optics 24, no. 5 (March 29, 2022): 055702. http://dx.doi.org/10.1088/2040-8986/ac5ae9.
Анотація:
Abstract Image quality evaluation is a key factor in the advancement and improvement of display technology, which could lead to effective improvement through the evaluation result from various aspects to achieve the better result further. However, display principles and image characteristics should be considered for Image quality evaluation. For three-dimensional (3D) holograms, charge-coupled devices are mainly applied to capture and record reconstructed images for analysis. 3D holograms have multiple depths and thus can lead to varying light intensities at the information points of the reconstructed images during image acquisition. Finally, it will lead to poor analysis results. Aiming at the previously mentioned problem, an algorithm called three-dimensional structural similarity (3D-SSIM) is proposed in this study. It is expected to optimize hologram evaluation and analysis. A fixed-focus shooting system matching silhouette sampling and SSIM is proposed to sample objects with 360° in order to implement 3D SSIM evaluation. This study successfully optimized the hologram evaluation method, leading to more accurate image evaluation results of hologram algorithms or holographic display systems.
35
Li, Xiong, Lianwei Chen, Yang Li, Xiaohu Zhang, Mingbo Pu, Zeyu Zhao, Xiaoliang Ma, Yanqin Wang, Minghui Hong, and Xiangang Luo. "Multicolor 3D meta-holography by broadband plasmonic modulation." Science Advances 2, no. 11 (November 2016): e1601102. http://dx.doi.org/10.1126/sciadv.1601102.
Анотація:
As nanofabrication technology progresses, the emerging metasurface has offered unique opportunities for holography, such as an increased data capacity and the realization of polarization-sensitive functionality. Multicolor three-dimensional (3D) meta-hologram imaging is one of the most pursued applications for meta-hologram not yet realized. How to reduce the cross-talk among different colors in broad bandwidth designs is a critical question. On the basis of the off-axis illumination method, we develop a novel way to overcome the cross-talk limitation and achieve multicolor meta-holography with a single type of plasmonic pixel. With this method, the usable data capacity can also be improved. It not only leads to a remarkable image quality, with a signal-to-noise ratio (SNR) five times better than that of the previous meta-hologram designs, but also paves the way to new meta-hologram devices, which mark an advance in the field of meta-holography. For example, a seven-color meta-hologram can be fabricated with a color gamut 1.39 times larger than that of the red, green, and blue (RGB) design. For the first time, a full-color meta-holographic image in the 3D space is also experimentally demonstrated. Our approach to expanding the information capacity of the meta-hologram is unique, which extends broad applications in data storage, security, and authentication.
36
Mohammed Salih, Sarah َQahtan, Puteri Suhaiza Sulaiman, Abdul Sattar Arif Khammas, Ramlan Mahmod, and Rahmita Wirza O. K. Rahmat. "OPACITY INFLUENCED INCONSTANT METHOD FOR 3D HOLOGRAPHIC PYRAMID RENDERING." Al-Mustansiriyah Journal of Science 30, no. 4 (January 15, 2020): 57. http://dx.doi.org/10.23851/mjs.v30i4.597.
Анотація:
The rapid growth of computer graphics in human daily life has inspired researchers to maximize image understanding and discover new methods for visualizing 3D objects. However, the image quality is constrained by the depth cue limitations of 3D objects produced by 3D displays. The advent of the holographic hologram pyramid display offers better image quality due to its ability to visualize 3D data with satisfactory depth. In this paper, we present a new visualization method named the “opacity influenced inconstant method” that exploits the custom surface rendering technique to enhance understanding of massive 3D objects for a hologram pyramid display. An algorithm is developed by adding an opacity variable and manipulating the intensity and position of the other variables to enhance the depth cues of a 3D object. The opacity value has the ability to show the inner structure of an object to be visualized if it is available. Our results show significant enhancement on the depth cues of the 3D object that presents as a hologram floating inside a transparent pyramid. The results of a survey conducted on computer graphics students shows that the quality of the hologram was preferred when it was compared to the previous method. In addition, the depth cues of the 3D object were reported to be enhanced by the opacity influenced inconstant method when compared to the previous study and standard shading.
37
Lee, Jeong-A., In-Kyu Moon, Hailing Liu, and Faliu Yi. "3D Holographic Image Recognition by Using Graphic Processing Unit." Journal of the Optical Society of Korea 15, no. 3 (September 25, 2011): 264–71. http://dx.doi.org/10.3807/josk.2011.15.3.264.
38
Zhai, Zhongsheng, Qinyang Li, Xuan He, Qinghua Lv, Wei Feng, Zhen Zeng, and Xuanze Wang. "Multiplane Holographic Imaging Using the Spatial Light Modulator." Photonics 10, no. 9 (August 27, 2023): 977. http://dx.doi.org/10.3390/photonics10090977.
Анотація:
The optimization of imaging accuracy and speed is a crucial issue in the development of computer-generated holograms (CGH) for three-dimensional (3D) displays. This paper proposes an optimized iterative algorithm based on the angular spectrum method (ASM) to achieve high-quality holographic imaging across multiple planes. To effectively utilize spatial resources for multi-image reconstruction and mitigate the speckle noise caused by the overlapping of target images, constraint factors are introduced between different layers within the same region. The seeking rule of the constraint factor is also analyzed. By utilizing both constraint factors and variable factors, the presented method is able to calculate phase holograms for target figure imaging at four different planes. Simulation and experimental results demonstrate that the proposed method effectively improves the overall quality of the different planes, thus holding great potential for wide-ranging applications in the field of holography.
39
Liu, Yunpeng, Teng Zhang, Jian Su, Tao Jing, Min Lin, Pei Li, and Xingpeng Yan. "Reconstruction resolution enhancement of EPISM based holographic stereogram with hogel spatial multiplexing." Chinese Physics B 31, no. 4 (March 1, 2022): 044201. http://dx.doi.org/10.1088/1674-1056/ac306f.
Анотація:
We investigate how the splicing mode of a holographic element (hogel) affects the reconstruction of a 3D scene to improve the reconstruction resolution of a holographic stereogram fabricated using the effective perspective image segmentation and mosaicking method (EPISM). First, the effect of hogel spatial multiplexing on holographic recording and reconstruction is studied based on the mechanism of recording interference fringes in the holographic recording medium. Second, combined with the influence of multiple exposures on the hologram’s diffraction efficiency, the diffraction efficiency of the holographic stereogram is analyzed in the spatial multiplexing mode. The holographic stereogram is then regarded as a special optical imaging system. The theory of spatial bandwidth product is adopted to describe the comprehensive resolution of the holographic stereogram, which explains why hogel spatial multiplexing can significantly improve the reconstruction resolution of a holographic stereogram. Compared with the traditional printing method under the same parameters in optical experiments, hogel spatial multiplexing has a lower diffraction efficiency but a higher quality of reconstructed image, consistent with the theoretical analysis.
40
Fang Li, Fang Li, Yong Bi Yong Bi, Hao Wang Hao Wang, Minyuan Sun Minyuan Sun, and Xinxin Kong and Xinxin Kong. "Weighted 3D GS algorithm for image-quality improvement of multi-plane holographic display." Chinese Journal of Lasers 39, no. 10 (2012): 1009001. http://dx.doi.org/10.3788/cjl201239.1009001.
41
Amineh, Reza K., Maryam Ravan, Raveena Sharma, and Smit Baua. "Three-Dimensional Holographic Imaging Using Single Frequency Microwave Data." International Journal of Antennas and Propagation 2018 (July 17, 2018): 1–14. http://dx.doi.org/10.1155/2018/6542518.
Анотація:
Three-dimensional (3D) microwave and millimeter wave imaging techniques based on the holographic principles have been successfully employed in several applications such as security screening, body shape measurement for the apparel industry, underground imaging, and wall imaging. The previously proposed 3D holographic imaging techniques require the acquisition of wideband data over rectangular or cylindrical apertures. Requirement for wideband data imposes limitations on the hardware (in particular at very high or very low frequencies). It may also lead to errors in the produced images if the media is dispersive (e.g., in biomedical imaging) and not modeled properly in the image reconstruction process. To address these limitations, here, we propose a technique to perform 3D imaging with single frequency data. Instead of collecting data at multiple frequencies, we acquire the backscattered fields with an array of resonant antennas. We demonstrate the possibility of 3D imaging with the proposed setup and perform a comprehensive study of the capabilities and limitations of the technique via simulations. To perform a realistic study, the simulation data is contaminated by noise.
42
He, Zehao, Kexuan Liu, and Liangcai Cao. "Watermarking and Encryption for Holographic Communication." Photonics 9, no. 10 (September 21, 2022): 675. http://dx.doi.org/10.3390/photonics9100675.
Анотація:
Holographic communication is a three-dimensional (3D) video communication technology based on computer-generated holograms (CGHs) which has the potential to give users a more realistic visual perception. As this is an emerging field, the encrypted encoding and decoding methods in holographic communication have not been widely studied. In this work, a watermarking and encryption method for holographic communication is proposed. A watermark is inserted into the original image using the discrete cosine transform before the calculation of the CGH, while a secret key is employed to produce the encrypted CGH during the holographic calculation. Through the proposed watermarking and encryption method, the signal of holographic communication is difficult to decrypt. Even if the signal is decrypted, the source of the leak is easy to trace due to the existence of the watermark. The watermarking and encryption method can provide a practical solution for the privacy protection and copyright protection of 3D video communication.
43
Reddy, B. Lokesh, and Anith Nelleri. "Convex optimization for additive noise reduction in quantitative complex object wave retrieval using compressive off-axis digital holographic imaging." Journal of Intelligent Systems 31, no. 1 (January 1, 2022): 706–15. http://dx.doi.org/10.1515/jisys-2022-0043.
Анотація:
Abstract Image denoising is one of the important problems in the research field of computer vision, artificial intelligence, 3D vision, and image processing, where the fundamental aim is to recover the original image features from a noisy contaminated image. The camera sensor additive noise present in the holographic recording process reduces the quality of the retrieved image. Even though various techniques have been developed to minimize the noise in digital holography, the noise reduction still remains a challenging task. This article presents a compressive sensing (CS) technique to minimize the additive noise in the digital holographic reconstruction process. We demonstrate the reduction of additive noise using complex wave retrieval method as a sensing matrix in the CS model. The proposed CS method to suppress the noise during the reconstruction process is illustrated using numerical simulations. Only 50% of the pixel measurements are considered in the noisy hologram, which is far less than the original complex object pixels. The impact of additive gaussian noise in the recording plane on the reconstruction accuracy of both intensity and phase distribution is analysed. The CS method denoises and estimates the complex object information accurately. The numerical simulation results have shown that the proposed CS method has effectively minimized the noise in the reconstructed image and has greatly improved the quality of both intensity and phase information.
44
Xu, Fuyang, Xin Yang, Wenjie Yu, Yuyi Jiang, Qiang Song, and Guobin Ma. "Computer generated color rainbow holographic stereogram." Journal of Optics 24, no. 5 (April 5, 2022): 055703. http://dx.doi.org/10.1088/2040-8986/ac5dd7.
Анотація:
Abstract In this research, a fast method to calculate the color rainbow holographic stereogram (CRHS) by taking full advantage of the sparsity of the frequency domain is demonstrated. The CRHS is a novel color rainbow hologram containing a large number of elemental CRHSs, where each elemental CRHS only reproduces the color light field information of local 3D color object. The color of the reconstructed color 3D image perceived by the human eye is determined by the spectrum of the reproduced dispersion of different elemental CRHSs that enter the human eye. The calculation of the CRHS is implemented with parallel computing by inversely Fourier transforming the frequency of each elemental CRHS. With the proposed method, the computation time for a resolution of 200k × 200k pixels and size of 64 × 64 mm CRHS is only 15.4 min for a color 3D model with 406k object points. The optical reconstruction with a white LED light illumination proves the effectiveness of our proposed method, which can be applied to the field of color holographic 3D display, advertising or holographic packaging.
45
Yu, Ding, Shang Wenbin, Yang Hong, and 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.
Анотація:
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.
46
Wang, Hui Bai, and Jian Feng Hou. "The Research of Digital Sandbox System." Advanced Materials Research 756-759 (September 2013): 1798–802. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.1798.
Анотація:
Digital sandbox is mainly the use of advanced computer technology, adding vivid images multimedia presentations and interactive features, such as 3D-3 dimensional animation and 3D model, combined with state-of-the-art optical imaging technology, on the basis of the existing traditional sandbox, to entertain visitors with dynamic visual effects, beautiful and multi-faceted show. The system for digital sandbox, the study of the generation and synthesis of the of holographic imaging surface image, with MAYA combined, quickly generate the image in all directions, and synthesis, resulting in a realistic three-dimensional scene; interactive virtual scene with speakers, through data gloves to control scene, to reach a wonderful stereoscopic display effect.
47
Wang, Zi, Yumeng Su, Yujian Pang, Qibin Feng, and Guoqiang Lv. "A Depth-Enhanced Holographic Super Multi-View Display Based on Depth Segmentation." Micromachines 14, no. 9 (August 31, 2023): 1720. http://dx.doi.org/10.3390/mi14091720.
Анотація:
A super multi-view (SMV) near-eye display (NED) effectively provides depth cues for three-dimensional (3D) display by projecting multiple viewpoint or parallax images onto the retina simultaneously. Previous SMV NED have suffered from a limited depth of field (DOF) due to a fixed image plane. In this paper, a holographic SMV Maxwellian display based on depth segmentation is proposed to enhance the DOF. The proposed approach involves capturing a set of parallax images and their corresponding depth maps. According to the depth maps, the parallax images are segmented into N sub-parallax images at different depth ranges. These sub-parallax images are then projected onto N image-recording planes (IRPs) of the corresponding depth for hologram computation. The wavefront at each IRP is calculated by multiplying the sub-parallax images with the corresponding spherical wave phases. Then, they are propagated to the hologram plane and added together to form a DOF-enhanced hologram. The simulation and experimental results are obtained to validate the effectiveness of the proposed method in extending the DOF of the holographic SMV displays, while accurately preserving occlusion.
48
Sasaki, Kenko, Eiichiro Tanji, and Hiroshi Yoshikawa. "Special Issue Image Technology of Next Generation. Data Compression for Holographic 3D Image." Journal of the Institute of Television Engineers of Japan 48, no. 10 (1994): 1238–44. http://dx.doi.org/10.3169/itej1978.48.1238.
49
Chen, Jhen-Si, and Daping Chu. "Realization of real-time interactive 3D image holographic display [Invited]." Applied Optics 55, no. 3 (January 6, 2016): A127. http://dx.doi.org/10.1364/ao.55.00a127.
50
Latychevskaia, Tatiana, Colin Robert Woods, Yi Bo Wang, Matthew Holwill, Eric Prestat, Sarah J. Haigh, and Kostya S. Novoselov. "Convergent beam electron holography for analysis of van der Waals heterostructures." Proceedings of the National Academy of Sciences 115, no. 29 (July 3, 2018): 7473–78. http://dx.doi.org/10.1073/pnas.1722523115.
Анотація:
The van der Waals heterostructures, which explore the synergetic properties of 2D materials when assembled into 3D stacks, have already brought to life a number of exciting phenomena and electronic devices. Still, the interaction between the layers in such assembly, possible surface reconstruction, and intrinsic and extrinsic defects are very difficult to characterize by any method, because of the single-atomic nature of the crystals involved. Here we present a convergent beam electron holographic technique which allows imaging of the stacking order in such heterostructures. Based on the interference of electron waves scattered on different crystals in the stack, this approach allows one to reconstruct the relative rotation, stretching, and out-of-plane corrugation of the layers with atomic precision. Being holographic in nature, our approach allows extraction of quantitative information about the 3D structure of the typical defects from a single image covering thousands of square nanometers. Furthermore, qualitative information about the defects in the stack can be extracted from the convergent diffraction patterns even without reconstruction, simply by comparing the patterns in different diffraction spots. We expect that convergent beam electron holography will be widely used to study the properties of van der Waals heterostructures.