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Articoli di riviste sul tema "Digital holography"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 maggio 2024

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1

Kang, Hoonjong, Dimana Nazarova, Branimir Ivanov, Sunghee Hong, Joo Sup Park, Youngmin Kim, Jiyong Park, Nataliya Berberova, Elena Stoykova e Nikola Malinowski. "Digital Holographic Printing Methods for 3D Visualization of Cultural Heritage Artifacts". Digital Presentation and Preservation of Cultural and Scientific Heritage 4 (30 settembre 2014): 69–78. http://dx.doi.org/10.55630/dipp.2014.4.8.

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Holography enables capture and reconstruction of the optical field scattered from three-dimensional (3D) objects. The hologram encodes both amplitude and phase of the field under coherent illumination, whereas photography records only the amplitude by incoherent light. 3D visualization feature of holography motivates expansion of research efforts dedicated to digital holographic imaging methods as a holographic display or a holographic printer. The paper presents two holographic 3D printing techniques which combine digital 3D representation of an object with analog holographic recording. Generation of digital contents is considered for a holographic stereogram printer and a recently proposed wavefront printer. These imaging methods could be applied to specific artifacts which are difficult to be recorded by conventional analog holography.

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Picart, Pascal. "Recent advances in speckle decorrelation modeling and processing in digital holographic interferometry". Photonics Letters of Poland 13, n. 4 (30 dicembre 2021): 73. http://dx.doi.org/10.4302/plp.v13i4.1126.

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Digital holography, and especially digital holographic interferometry, is a powerful approach for the characterization of modifications at the surface or in the volume of objects. Nevertheless, the reconstructed phase data from holographic interferometry is corrupted by the speckle noise. In this paper, we discuss on recent advances in speckle decorrelation noise removal. Two main topics are considered. The first one presents recent results in modelling the decorrelation noise in digital Fresnel holography. Especially the anisotropy of the decorrelation noise is established. The second topic presents a new approach for speckle de-noising using deep convolution neural networks. Full Text: PDF ReferencesP. Picart (ed.), New techniques in digital holography (John Wiley & Sons, 2015). CrossRef T.M. Biewer, J.C. Sawyer, C.D. Smith, C.E. Thomas, "Dual laser holography for in situ measurement of plasma facing component erosion (invited)", Rev. Sci. Instr. 89, 10J123 (2018). CrossRef M. Fratz, T. Beckmann, J. Anders, A. Bertz, M. Bayer, T. Gießler, C. Nemeth, D. Carl, "Inline application of digital holography [Invited]", Appl. Opt. 58(34), G120 (2019). CrossRef M.P. Georges, J.-F. Vandenrijt, C. Thizy, Y. Stockman, P. Queeckers, F. Dubois, D. Doyle, "Digital holographic interferometry with CO2 lasers and diffuse illumination applied to large space reflector metrology [Invited]", Appl. Opt. 52(1), A102 (2013). CrossRef E. Meteyer, F. Foucart, M. Secail-Geraud, P. Picart, C. Pezerat, "Full-field force identification with high-speed digital holography", Mech. Syst. Signal Process. 164 (2022). CrossRef L. Lagny, M. Secail-Geraud, J. Le Meur, S. Montresor, K. Heggarty, C. Pezerat, P. Picart, "Visualization of travelling waves propagating in a plate equipped with 2D ABH using wide-field holographic vibrometry", J. Sound Vib. 461 114925 (2019). CrossRef L. Valzania, Y. Zhao, L. Rong, D. Wang, M. Georges, E. Hack, P. Zolliker, "THz coherent lensless imaging", Appl. Opt. 58, G256 (2019). CrossRef V. Bianco, P. Memmolo, M. Leo, S. Montresor, C. Distante, M. Paturzo, P. Picart, B. Javidi, P. Ferraro, "Strategies for reducing speckle noise in digital holography", Light: Sci. Appl. 7(1), 1 (2018). CrossRef V. Bianco, P. Memmolo, M. Paturzo, A. Finizio, B. Javidi, P. Ferraro, "Quasi noise-free digital holography", Light. Sci. Appl. 5(9), e16142 (2016). CrossRef R. Horisaki, R. Takagi, J. Tanida, "Deep-learning-generated holography", Appl. Opt. 57(14), 3859 (2018). CrossRef E. Meteyer, F. Foucart, C. Pezerat, P. Picart, "Modeling of speckle decorrelation in digital Fresnel holographic interferometry", Opt. Expr. 29(22), 36180 (2021). CrossRef M. Piniard, B. Sorrente, G. Hug, P. Picart, "Theoretical analysis of surface-shape-induced decorrelation noise in multi-wavelength digital holography", Opt. Expr. 29(10), 14720 (2021). CrossRef P. Picart, S. Montresor, O. Sakharuk, L. Muravsky, "Refocus criterion based on maximization of the coherence factor in digital three-wavelength holographic interferometry", Opt. Lett. 42(2), 275 (2017). CrossRef P. Picart, J. Leval, "General theoretical formulation of image formation in digital Fresnel holography", J. Opt. Soc. Am. A 25, 1744 (2008). CrossRef S. Montresor, P. Picart, "Quantitative appraisal for noise reduction in digital holographic phase imaging", Opt. Expr. 24(13), 14322 (2016). CrossRef S. Montresor, M. Tahon, A. Laurent, P. Picart, "Computational de-noising based on deep learning for phase data in digital holographic interferometry", APL Photonics 5(3), 030802 (2020). CrossRef M. Tahon, S. Montresor, P. Picart, "Towards Reduced CNNs for De-Noising Phase Images Corrupted with Speckle Noise", Photonics 8(7), 255 (2021). CrossRef E. Meteyer, S. Montresor, F. Foucart, J. Le Meur, K. Heggarty, C. Pezerat, P. Picart, "Lock-in vibration retrieval based on high-speed full-field coherent imaging", Sci. Rep. 11(1), 1 (2021). CrossRef

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3

Balasubramani, Vinoth, Małgorzata Kujawińska, Cédric Allier, Vijayakumar Anand, Chau-Jern Cheng, Christian Depeursinge, Nathaniel Hai et al. "Roadmap on Digital Holography-Based Quantitative Phase Imaging". Journal of Imaging 7, n. 12 (26 novembre 2021): 252. http://dx.doi.org/10.3390/jimaging7120252.

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Quantitative Phase Imaging (QPI) provides unique means for the imaging of biological or technical microstructures, merging beneficial features identified with microscopy, interferometry, holography, and numerical computations. This roadmap article reviews several digital holography-based QPI approaches developed by prominent research groups. It also briefly discusses the present and future perspectives of 2D and 3D QPI research based on digital holographic microscopy, holographic tomography, and their applications.

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4

Zhang, Yu Fei, e Yi Quan Wu. "A Method for Eliminating Zero-Order Image in Digital Holograph Based on Contourlet Transform". Advanced Materials Research 760-762 (settembre 2013): 80–83. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.80.

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In the reconstruction process of digital holograph, zero-order image has a bad impact on the quality of real image. In this paper, a new way to eliminate zero-order image in digital holography is proposed. Firstly, digital holography image is decomposed by contourlet transform, then remove the low frequency. The new digital holography image is obtained by inverse contourlet transform. Experiments show that, compared with spatial filtering, frequency domain filtering, laplacian filtering and eliminate zero-order image method based on wavelet, the new method proposed in this paper can eliminate zero-order image better, whats more, the real image is also strengthened in some way.

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Iano, Randrianasoa, e Randriamaroson Mahandrisoa. "Enhancing Real-Time Pyramid Holographic Display Through Iterative Algorithm Optimization for 3D Image Reconstruction". American Journal of Optics and Photonics 12, n. 1 (29 aprile 2024): 9–17. http://dx.doi.org/10.11648/j.ajop.20241201.12.

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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.

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6

Chen, Duofang, Lin Wang, Xixin Luo, Hui Xie e Xueli Chen. "Resolution and Contrast Enhancement for Lensless Digital Holographic Microscopy and Its Application in Biomedicine". Photonics 9, n. 5 (19 maggio 2022): 358. http://dx.doi.org/10.3390/photonics9050358.

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An important imaging technique in biomedicine, the conventional optical microscopy relies on relatively complicated and bulky lens and alignment mechanics. Based on the Gabor holography, the lensless digital holographic microscopy has the advantages of light weight and low cost. It has developed rapidly and received attention in many fields. However, the finite pixel size at the sensor plane limits the spatial resolution. In this study, we first review the principle of lensless digital holography, then go over some methods to improve image contrast and discuss the methods to enhance the image resolution of the lensless holographic image. Moreover, the applications of lensless digital holographic microscopy in biomedicine are reviewed. Finally, we look forward to the future development and prospect of lensless digital holographic technology.

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7

Wang, Yu Tian, Dong Sheng Wang e Wei Wei Pan. "The Analysis and Research on Digital Holography Signal Based on Wavelet Theory". Advanced Materials Research 216 (marzo 2011): 414–18. http://dx.doi.org/10.4028/www.scientific.net/amr.216.414.

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When introduce the wavelet theory to filter the hologram and the reconstructed image in the digital holography, the noise of the reconstructed image is greatly reduced. In the off-axis digital holography, the zero-order wave is decreased dramatically when after a wavelet filter, at the same time, the speckle noise is also reduced, and it turns out that the resolution of the reconstruction image is improved greatly. The system launches the research thoroughly on the three-dimensional body digital holographic technology, from the theory to the application, from the simulation to the experiment, and has elaborated and analyzed each characteristic of three-dimensional body digital holographic technology. It proposes many kinds of improved effective method of three-dimensional body digital holographic restructuring information, and finally has effectively explored the three-dimensional body digital holographic technology application through the experiment.

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Takahashi, Yoshitaka, Masatoshi Saito, Toru Nakajima e Masakazu Shingu. "Determination of Phase Shift by Digital Holography". Applied Mechanics and Materials 888 (febbraio 2019): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amm.888.43.

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In phase shifting interferometry phase shift is applied by various ways, but applying it with high accuracy, especially by LD current modulation, is not easy. In order to determine the accurate phase shift a new method has been proposed that the value of LD current corresponding to π/2 phase shift can be determined by phase shifting digital holography. The measured data of standard in surface shape measurement were used for calibration, and the obtained value was confirmed to cause noise reduction and improvement of holographic reconstructed images in digital holography.

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9

Zhang, Tong, Ichirou Yamaguchi e Hywel Morgan. "Digital Holographic Microscopy". Microscopy and Microanalysis 5, S2 (agosto 1999): 362–63. http://dx.doi.org/10.1017/s1431927600015130.

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We applied phase-shifting digital holography to microscopy in this paper. At first lensless microscopy is proposed, in which no optical adjustment is necessary. Then, the method is applied to relax the limitation of focal depth in traditional optical microscopy. A theory for image formation and experimental verification using a few specimens are described.keywords: microscopy, digital holography, phase shiftingDue to the finite focal depth of an imaging lens, a limitation to normal optical microscopy-is that, only the 2-dimensional (2-D) information of an object can be obtained at one time. Besides, it is not convenient for quantitative analysis the observed image. Optical sectioning microscopy (OSM) and scanning confocal microscopy (SCM) which use opto-electronic detection have been proposed for quantitative analysis of a 3-D object. However, the former requires critical mechanical adjustment, while the latter uses timeconsuming mechanical 3-D scanning. Holographic microscopy can solve these problems because it can record 3-D information at one time. But, the chemical processing of holograms and the mechanical focusing at the reconstructed images cause more or less trouble. A 3-D imaging technique without use of photographic recording called optical scanning holography has recently been reported. However, there are also some trouble owing to the twin-image noise.

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10

Zhao, Jieming, Zhan Gao, Shengjia Wang, Yuhao Niu, Lin Deng e Ye Sa. "Multi-Object Deep-Field Digital Holographic Imaging Based on Inverse Cross-Correlation". Applied Sciences 13, n. 20 (18 ottobre 2023): 11430. http://dx.doi.org/10.3390/app132011430.

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To address the complexity of small or unique reconstruction distances in digital holography, we propose an inverse cross-correlation-based algorithm for the digital holographic imaging of multiplanar objects with a large depth of field. In this method, a planar output mapping is closely around the objects, and it is established by calculating the image inverse cross-correlation matrix of the reconstructed image at similar reconstruction distances, whereby the object edges serve as the result guide. Combining the search for edge planes with the depth estimation operator, the depth of field of digital holography is improved, thus allowing for a digital holography that is capable of meeting the requirements of the holographic imaging of multiplanar objects. Compared with the traditional depth estimation operator method, the proposed method solves the reconstruction ambiguity problem in multiple planes with a simple optical path, and no additional optical or mechanical devices need to be added, thus greatly improving the reconstruction quality. The numerical calculation results and the experimental results with multiplanar samples validate the effectiveness of the proposed method.

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Liu, Cheng. "Digital holographic aberration compensation in electron holography". Optical Engineering 42, n. 3 (1 marzo 2003): 651. http://dx.doi.org/10.1117/1.1544474.

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Wan, Zhensong, Zijian Shi, Qiang Liu e and Xing Fu. "Holographic Tailoring of Structured Light Field with Digital Device". Photonics 9, n. 7 (21 luglio 2022): 506. http://dx.doi.org/10.3390/photonics9070506.

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Structured light fields have attracted much attention due to rich spatial degrees of freedom. The tailoring of an arbitrary structured light field on demand is the precondition for the application of structured light. Therefore, the computer holography method used to reconstruct a coherent light field wavefront has been naturally applied for generating structured light. In this work, we comprehensively demonstrate the principles and procedures of pure-phase computer-generated holography (PP-CGH) and binary-amplitude computer-generated holography (BA-CGH) methods for tailoring structured light, realized by two digitally programmable devices: liquid-crystal spatial light modulators (Lc-SLM) and digital micromirror devices (DMD), respectively. Moreover, we first compare the two approaches in detail and clarify the recipe to obtain a high tailoring accuracy and efficiency, which will help researchers to better understand and utilize the holographic tailoring of structured optical fields.

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Fedorov, A. G., e M. P. Mironov. "Numerical simulation of wave propagation through a spherical particle within the framework of generalised Lorenz-Mie theory". Vestnik of North-Eastern Federal University 20, n. 4 (31 dicembre 2023): 31–38. http://dx.doi.org/10.25587/2222-5404-2023-20-4-31-38.

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Holography has been widely used for measuring and visualising transients in multiphase flows. Earlier, one of the drawbacks of this approach was the need to register on various photosensitive elements and its subsequent transfer to digital format and restoration. With the development of digital technologies, direct registration of interference patterns (holographic images) into a CCD matrix became possible. However, even in digital holography there are a number of problems that need to be solved. These problems pertain to recovery algorithms, efficient data processing and resolution, among others. Currently, the numerical implementation of the restoration and processing of holographic images can be done within the framework of classical diffraction theory or with the help of generalised Lorenz-Mie theory. The first implies an indirect solution of Maxwell's equations, i.e., application of the Huygens-Fresnel principle. The second approach involves a direct solution of Maxwell's equations for the holographic problem. In the framework of this work, a numerical simulation of holographic imaging of fields from spherical particles based on the generalised Lorenz-Mie theory is proposed. Within the framework of this work, a numerical implementation of modelling of holographic images of a homogeneous sphere based on the generalised Lorenz-Mie theory is presented. The implementation code in the python programming language is presented. The results of the study demonstrate the possibility of effective use of digital holography for visualisation and analysis of spherical objects.

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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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15

Petrov, Viktor, Anastsiya Pogoda, Vladimir Sementin, Alexander Sevryugin, Egor Shalymov, Dmitrii Venediktov e Vladimir Venediktov. "Advances in Digital Holographic Interferometry". Journal of Imaging 8, n. 7 (12 luglio 2022): 196. http://dx.doi.org/10.3390/jimaging8070196.

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Holographic interferometry is a well-established field of science and optical engineering. It has a half-century history of successful implementation as the solution to numerous technical tasks and problems. However, fast progress in digital and computer holography has promoted it to a new level of possibilities and has opened brand new fields of its application. In this review paper, we consider some such new techniques and applications.

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Kalenkov, S. G., e G. S. Kalenkov. "Digital Hyperspectral Holography". Optoelectronics, Instrumentation and Data Processing 56, n. 2 (marzo 2020): 157–62. http://dx.doi.org/10.3103/s8756699020020089.

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Osten, Wolfgang, Torsten Baumbach e Werner Jüptner. "Comparative digital holography". Optics Letters 27, n. 20 (15 ottobre 2002): 1764. http://dx.doi.org/10.1364/ol.27.001764.

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Marquardt, Erik. "Digital image holography". Optical Engineering 37, n. 5 (1 maggio 1998): 1514. http://dx.doi.org/10.1117/1.601666.

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19

Kroll, Mattias, Lennart Muhlfeld e Dietmar Block. "Stereoscopic Digital Holography". IEEE Transactions on Plasma Science 38, n. 4 (aprile 2010): 897–900. http://dx.doi.org/10.1109/tps.2009.2032548.

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Zhang, Y., W. Zhou, X. Wang, Y. Cui e W. Sun. "Terahertz Digital Holography". Strain 44, n. 5 (ottobre 2008): 380–85. http://dx.doi.org/10.1111/j.1475-1305.2008.00433.x.

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Demoli, Nazif, Jurica Mes̆trović e Ivica Sović. "Subtraction digital holography". Applied Optics 42, n. 5 (10 febbraio 2003): 798. http://dx.doi.org/10.1364/ao.42.000798.

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Demoli, Nazif, Hanan Halaq, Kristina Šariri, Marc Torzynski e Dalibor Vukicevic. "Undersampled digital holography". Optics Express 17, n. 18 (21 agosto 2009): 15842. http://dx.doi.org/10.1364/oe.17.015842.

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Zheng, Xiaowan, Siyuan Fang, Bicheng Guo, Bernard Sia e Lianxiang Yang. "Development of Simultaneous Dual-Resolution Digital Holography System". Applied Sciences 13, n. 5 (23 febbraio 2023): 2856. http://dx.doi.org/10.3390/app13052856.

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This research paper is focused on the development of a digital holography system for simultaneous dual-resolution measurements. Digital holography has been widely used for deformation measurements and non-destructive testing (NDT) due to its advantages of high sensitivity, high accuracy, and whole-field, non-touch measurements. A traditional test only has one spatial resolution, which can cause a big deformation to be indistinguishable or minor defects to be ignored. Both large and small fields of view should be observed to reach a multi-spatial resolution measurement. Usually, multiple separate tests are used to observe the different sized fields of view, resulting in higher costs and longer required testing times. Furthermore, these tests may not be repeatable in some cases. This paper presents research on a novel digital holography system that achieves dual spatial resolution measurements simultaneously by testing different-sized fields of view with a single camera. The novel system has two optical channels with two optical layouts of holography to measure deformation. By changing the combined focus length, the two holographic setups have different fields of view, i.e., one has a large and the other has a small field of view. To realize a simultaneous test, the polarization technique is used to avoid cross-interference between the two optical layouts. Finally, spatial carrier fringes with different orientations are introduced into the two holographic setups by appropriately adjusting the reference beam of each setup. The different oriented spatial carrier fringes enable the spectrums of the two interferograms to be separated after a FT (Fourier transform) and the phase distributions of the two interferograms can be extracted and separated by windowing the spectrum to perform an IFT (inverse Fourier transform). The phase distributions can then be used to analyze and calculate the deformations. The experiment using this system is described in this paper and the practicability of this method is verified by the obtained experimental results.

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Fu, Yiping, Junmin Leng e Zhenqi Xu. "Speckle Reduction in Digital Holography by Fast Logistic Adaptive Non-Local Means Filtering". Photonics 11, n. 2 (4 febbraio 2024): 147. http://dx.doi.org/10.3390/photonics11020147.

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Digital holography is a promising imaging technology. However, there is speckle noise in the reconstructed image of a digital hologram. Speckle degrades the quality of the reconstructed image. Suppression of speckle noise is a challenging problem in digital holography. A novel method is proposed to reduce speckle by a fast logistic adaptive non-local means (LA-NLM) algorithm. In the proposed method, the logistic function is incorporated into the weight calculation of the NLM algorithm to account for multiplicative speckle noise. Filtering parameters are dynamically adjusted according to the statistical property of speckle in the reconstructed image. To enhance computational efficiency, the proposed algorithm takes advantage of the integral image technique to speed up the calculation of the similarity between image patches. Simulated and experimental digital holograms are obtained to verify the proposed method. The results show that the speckle noise is effectively suppressed in digital holography. The proposed method is efficient and feasible, and can be applied to such fields as three-dimensional display, holographic measurement, and medical diagnosis.

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Lee, Jonghyun, Youngrok Kim, Kihong Choi, Joonku Hahn, Sung-Wook Min e Hwi Kim. "Digital Incoherent Compressive Holography Using a Geometric Phase Metalens". Sensors 21, n. 16 (20 agosto 2021): 5624. http://dx.doi.org/10.3390/s21165624.

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We propose a compressive self-interference incoherent digital holography (SIDH) with a geometric phase metalens for section-wise holographic object reconstruction. We specify the details of the SIDH with a geometric phase metalens design that covers the visible wavelength band, analyze a spatial distortion problem in the SIDH and address a process of a compressive holographic section-wise reconstruction with analytic spatial calibration. The metalens allows us to realize a compressive SIDH system in the visible wavelength band using an image sensor with relatively low bandwidth. The operation of the proposed compressive SIDH is verified through numerical simulations.

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Williams, L., P. P. Banerjee, G. Nehmetallah e S. Praharaj. "Holographic volume displacement calculations via multiwavelength digital holography". Applied Optics 53, n. 8 (5 marzo 2014): 1597. http://dx.doi.org/10.1364/ao.53.001597.

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Dyomin, Victor, Alexander Gribenyukov, Sergey Podzyvalov, Nikolay Yudin, Mikhail Zinoviev, Igor Polovtsev, Alexandra Davydova e Alexey Olshukov. "Application of Infrared Digital Holography for Characterization of Inhomogeneities and Voluminous Defects of Single Crystals on the Example of ZnGeP2". Applied Sciences 10, n. 2 (7 gennaio 2020): 442. http://dx.doi.org/10.3390/app10020442.

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In this work, the method of IR digital holography intended for detection of volumetric defects in ZnGeP2 single crystals has been tested. The holographic method is verified by a comparison of the results obtained with the data obtained by other methods. The spatial resolution of the experimental setup is ~15–20 µm. The volumetric defects of the ZnGeP2 crystal structure (in samples with thickness up to 50 mm) such as growth striations, dislocation chain, and inclusions of the second phase (Zn3P2) shaped as needles up to ~100 µm long and ~10 µm wide have been visualized by the method of IR digital holography.

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Petoukhov, S. V. "GENETIC CODING SYSTEM ANDALGEBRAIC HOLOGRAPHY". Metaphysics, n. 2 (25 agosto 2022): 113–27. http://dx.doi.org/10.22363/2224-7580-2022-2-113-127.

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The article is devoted to the structural features of the molecular genetic coding system. These features in their matrix representation turn out to be conjugate with the matrix structures of algebraic holography, which have long been used in digital informatics. The relationship between ensembles of genetic structures and bit-reversing holography, split-quaternions, and the Poincaré disk model of hyperbolic motions is described. This connection leads to well-known works on quantum holographic noise-immune codes and makes it possible to comprehend the facts of the realization of hyperbolic geometry in genetically inherited macrophysiological phenomena.

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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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Hu, Nan, Li Chun Pu e Jian Wei Wei. "Recording and Reconstruction of Digital Holography". Applied Mechanics and Materials 105-107 (settembre 2011): 1812–15. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.1812.

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Holography is an important non-destructive testing method for its unique idea of recording the complete wave field, i.e. both the amplitude and the phase of the light wave scattered by the object. In digital holography (DH), hologram is recorded digitally by CCD and then numerically reconstructed in the computer. The biggest limitation for digital holography is the constraint of the resolution of the CCD camera and the recording distance is very important for DH. This article presents the principles of recording and reconstruction in digital holography. The experimental results and conclusion are also provided in this paper.

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Corda, Roberto, Daniele Giusto, Antonio Liotta, Wei Song e Cristian Perra. "Recent Advances in the Processing and Rendering Algorithms for Computer-Generated Holography". Electronics 8, n. 5 (17 maggio 2019): 556. http://dx.doi.org/10.3390/electronics8050556.

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Digital holography represents a novel media which promises to revolutionize the way the users interacts with content. This paper presents an in-depth review of the state-of-the-art algorithms for advanced processing and rendering of computer-generated holography. Open-access holographic data are selected and characterized as references for the experimental analysis. The design of a tool for digital hologram rendering and quality evaluation is presented and implemented as an open-source reference software, with the aim to encourage the approach to the holography research area, and simplify the rendering and quality evaluation tasks. Exploration studies focused on the reproducibility of the results are reported, showing a practical application of the proposed architecture for standardization activities. A final discussion on the results obtained is reported, also highlighting the future developments of the reconstruction software that is made publicly available with this work.

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Qin, Shaohan. "Capturing the 3D secrets of a flickering candle: Based on digital holographic microscopy". Theoretical and Natural Science 34, n. 1 (2 aprile 2024): 19–26. http://dx.doi.org/10.54254/2753-8818/34/20241138.

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The temperature distribution of flames has long been a fascinating topic of study. To quantitatively analyze the temperature field of flames, traditional methods include infrared devices, thermocouples and thermometer. However, these conventional techniques provide only cross-sectional snapshots while lacking the capability to offer real-time 3D temperature field visualization. This paper proposed a different approach to measure the 3D temperature field with accurate data and details by applying the digital holography. First, based on digital holography and the equations of thermodynamics, we derived the equation between the phase difference and temperature. Then we built a transmission off-axis digital holographic microscopy in the experimental section to perform static and dynamic flame measurements. To calibrate the actual temperatures and test our theorys accuracy, we also took photographs of the flames as a standard reference using an infrared thermal imager. Finally, we obtained a quantitative 3D distribution of the temperature field and a qualitative dynamic process of 3D temperature field. Our results show that the temperature decreases from the center of the flame and follows a general pattern. The comparison with infrared imaging shows that digital holography offers an accurate measurement of the temperature.

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Coppola, Giuseppe, Maria Mangini, Gianluigi Zito, Edoardo De Tommasi, Anna Chiara De Luca e Maria Antonietta Ferrara. "Polarization Sensitive Digital Holographic Imaging in Biology". EPJ Web of Conferences 266 (2022): 04001. http://dx.doi.org/10.1051/epjconf/202226604001.

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A new, simple digital holography-based polarization microscope for quantitative birefringence imaging of biological cells is presented. As a proof of concept, two different class of cells have been characterized by polarization sensitive digital holographic imaging (PSDHI). These two cases study reported are: differentiation of leukaemia cells and identification of reacted sperm cells. Although further experimentation is necessary, the suggested approach could represent a prospective label-free diagnostic tool for use in biological and medical research and diagnosis.

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Yamaguchi, Ichirou. "Shape and deformation measurements of rough surfaces by phase-shifting digital holography". Photonics Letters of Poland 13, n. 4 (30 dicembre 2021): 70. http://dx.doi.org/10.4302/plp.v13i4.1127.

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In digital holography recording as reconstruction of holograms are performed digitally by modern photonic devices to increase of optical non-contacting measurements of various kinds of surfaces including both specular and rough surfaces. In this article we discusses these features of digital holography using phase shifting techniques that has much extended its capabilities. Full Text: PDF ReferencesG. Bruning, D.R. Herriott, J.E. Gallagher, D.P. Rosenfeld, A.D. White, D.J. Brangaccio, "Digital Wavefront Measuring Interferometer for Testing Optical Surfaces and Lenses", Appl. Opt. 13, 2693 (1974). CrossRef I. Yamaguchi, T. Zhang, "Phase-shifting digital holography", Opt. Lett. 22, 1268 (1997). CrossRef F. Zhang, I. Yamaguchi, L.P. Yaroslavsky, "Algorithm for reconstruction of digital holograms with adjustable magnification", Opt. Lett. 29, 1668 (2004). CrossRef I. Yamaguchi, "Holography, speckle, and computers", Optics and Lasers in Engineering 39, 411 (2003). CrossRef I. Yamaguchi, M. Yokota, "Speckle noise suppression in measurement by phase-shifting digital holography", Opt. Eng. 48 085602 (2009). CrossRef I. Yamaguchi, J. Kato, S. Ohta, "Surface Shape Measurement by Phase-Shifting Digital Holography", Opt. Rev. 8, 85 (2001). CrossRef I. Yamaguchi, J. Kato, H. Matsuzaki, "Measurement of surface shape and deformation by phase-shifting image digital holography", Opt. Eng. 42, 1267 (2003). CrossRef F. Zhang, J.D.R. Valera, I. Yamaguchi, M. Yokota, G. Mills, "Vibration Analysis by Phase Shifting Digital Holography", Opt. Rev. 11, 5 (2004). CrossRef

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Mansoor, M. M., e J. George. "100 megahertz-rate ultrahigh-speed digital holography instrument". Journal of Instrumentation 17, n. 08 (1 agosto 2022): P08019. http://dx.doi.org/10.1088/1748-0221/17/08/p08019.

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Abstract This work presents the development of an ultrahigh-speed digital holography instrument that can perform volumetric measurements at a rate of up to 100 million frames per second. The system is based on an Ultra 8 camera that uses a single custom-built image intensifier with a segmented photocathode that can gate eight different imaging regions down to 10 ns. An in-line interferometric scheme is used to capture the deformation of a water drop as it is photoablated from irradiation by a 1064 nm wavelength pulsed laser beam. After a digital holographic video is captured, wavefront reconstruction is used to focus on discrete depth planes enabling the user to observe different 3-dimensional features of the drop as the field-of-view is scanned plane-by-plane. The reconstructions are detwinned and corrected for parallax and alignment error before a final image at any given depth is produced. We provide one-to-one comparisons between conventional focused imaging and digital holography to demonstrate the 3-dimensional visualization capabilities of the instrument with particular regard to dynamic events occurring at nanosecond time intervals for future applications to hypersonic flows and other short and ultrashort duration events.

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ZHANG Wen, 张雯, 周皓 ZHOU Hao, 顾济华 GU Ji-hua, 杨俊义 YANG Jun-yi, 姜锦虎 JIANG Jin-hu e 高本利 GAO Ben-li. "Multi-beam Digital Holography". ACTA PHOTONICA SINICA 39, n. 3 (2010): 533–36. http://dx.doi.org/10.3788/gzxb20103903.0533.

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37

Picart, Pascal, Julien Leval, Denis Mounier e Samuel Gougeon. "Time-averaged digital holography". Optics Letters 28, n. 20 (15 ottobre 2003): 1900. http://dx.doi.org/10.1364/ol.28.001900.

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38

Hamam, Habib. "Digital holography-based steganography". Optics Letters 35, n. 24 (13 dicembre 2010): 4175. http://dx.doi.org/10.1364/ol.35.004175.

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39

Bräuer, Ralf, Frank Wyrowski e Olof Bryngdahl. "Diffusers in digital holography". Journal of the Optical Society of America A 8, n. 3 (1 marzo 1991): 572. http://dx.doi.org/10.1364/josaa.8.000572.

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40

Corda, Roberto. "Digital holography data compression". Telfor Journal 11, n. 1 (2019): 52–57. http://dx.doi.org/10.5937/telfor1901052c.

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41

Yamaguchi, Ichirou. "Phase-Shifting Digital Holography". Optics and Photonics News 19, n. 7 (1 luglio 2008): 48. http://dx.doi.org/10.1364/opn.19.7.000048.

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42

Yamaguchi, Ichirou, e Tong Zhang. "Phase-shifting digital holography". Optics Letters 22, n. 16 (15 agosto 1997): 1268. http://dx.doi.org/10.1364/ol.22.001268.

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43

Santoyo, Fernando Mendoza. "3D Pulsed Digital Holography". Journal of Holography and Speckle 3, n. 2 (1 dicembre 2006): 93–97. http://dx.doi.org/10.1166/jhs.2006.014.

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44

Jacquot, Maxime, Patrick Sandoz e Gilbert Tribillon. "High resolution digital holography". Optics Communications 190, n. 1-6 (aprile 2001): 87–94. http://dx.doi.org/10.1016/s0030-4018(01)01046-x.

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45

Lee, Cheok Peng, A. Asundi, Yang Yu e Zhen Zhong Xiao. "Digital Holography Display (2)". Physics Procedia 19 (2011): 278–84. http://dx.doi.org/10.1016/j.phpro.2011.06.161.

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46

Koukourakis, Nektarios, Volker Jaedicke, Adamou Adinda-Ougba, Sebastian Goebel, Helge Wiethoff, Henning Höpfner, Nils C. Gerhardt e Martin R. Hofmann. "Depth-filtered digital holography". Optics Express 20, n. 20 (19 settembre 2012): 22636. http://dx.doi.org/10.1364/oe.20.022636.

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47

Kreuzer, H. J., e R. A. Pawlitzek. "Digital in-line holography". Europhysics News 34, n. 2 (marzo 2003): 62–65. http://dx.doi.org/10.1051/epn:2003206.

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48

Zhang, Wenhui, Liangcai Cao, Rujia Li, Hua Zhang, Hao Zhang, Qiang Jiang e Guofan Jin. "Wavefront division digital holography". AIP Advances 8, n. 5 (maggio 2018): 055304. http://dx.doi.org/10.1063/1.5030077.

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49

Amann, Stephan, Bingxin Xu, Yang He, Edoardo Vicentini, Theodor W. Hänsch, Qiang Lin, Kerry Vahala e Nathalie Picqué. "Digital holography with microcombs". EPJ Web of Conferences 287 (2023): 07012. http://dx.doi.org/10.1051/epjconf/202328707012.

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Abstract (sommario):

Optical microresonators are attractive comb sources due to their small form factor and stable broad optical spectra. We report on the first demonstration of microcomb-based digital holography. The large line spacing of microcombs promises an unprecedented combination of precision, fast update rate and ambiguity ranges on the scale of a few mm. Using a pulse-driven lithium niobate microcomb of 100 GHz line spacing and a scanning Michelson interferometer, we generate spectral hypercubes of holograms. Our first experimental results show that the amplitude and phase information of the object can be recovered for more than 100 comb lines.

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50

Invited Paper, Ichirou Yamaguchi. "Holography and speckle in phase-shifting digital holography". Chinese Optics Letters 7, n. 12 (2009): 1104–8. http://dx.doi.org/10.3788/col20090712.1104.

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