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Journal articles on the topic 'Holographic imaging techniques'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Kang, Hoonjong, Dimana Nazarova, Branimir Ivanov, et al. "Digital Holographic Printing Methods for 3D Visualization of Cultural Heritage Artifacts." Digital Presentation and Preservation of Cultural and Scientific Heritage 4 (September 30, 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. Gener

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PARK, Jung-Hoon, Kyoohyun KIM, and YongKeun PARK. "Holographic Optical Imaging and Manipulation Techniques." Physics and High Technology 26, no. 3 (2017): 7–14. http://dx.doi.org/10.3938/phit.26.008.

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Smith, D., O. Yurduseven, B. Livingstone, and V. Schejbal. "Microwave imaging using indirect holographic techniques." IEEE Antennas and Propagation Magazine 56, no. 1 (2014): 104–17. http://dx.doi.org/10.1109/map.2014.6821762.

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Purcell, Patrick, and Wendy Plesniak. "Computer generated spatial imaging." ITNOW 30, no. 1 (1988): 9–11. https://doi.org/10.1093/combul/30.1.9.

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Abstract The refined and iridescent imagery of holography has long had a dual role as a medium for visualisation in the laboratory and as an object of aesthetic interest in the art gallery. Its unique translucent and reflective visual character owes much to the ultra-precision of its fabrication techniques in both optics and chemistry. Now, a further element, computational process has begun to expand the types of images, the techniques of fabrication and most significantly the new applications in which holograms are finding a place. A new range of imaginative objects can be digitally modelled

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Howlett, Isela D., Wanglei Han, Michael Gordon, Photini Rice, Jennifer K. Barton, and Raymond K. Kostuk. "Volume holographic imaging endoscopic design and construction techniques." Journal of Biomedical Optics 22, no. 5 (2017): 056010. http://dx.doi.org/10.1117/1.jbo.22.5.056010.

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McCartney, M. R. "Electron Holographic Imaging of Magnetic Materials at Nanometer Scale Resolution." Microscopy and Microanalysis 3, S2 (1997): 519–20. http://dx.doi.org/10.1017/s143192760000948x.

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Traditional electron microscopy techniques for imaging magnetic microstructure include out-of-focus Fresnel or Lorentz imaging, Foucault imaging and differential phase contrast (DPC). Off-axis electron holography provides access to both the amplitude and phase of the electron wave which has passed through the sample and therefore can provide direct, quantitative information about the in-plane component of the magnetic induction. The Philips CM200-FEG microscope which was used for the holography described here is equipped with a powerful mini-lens below the specimen enabling 2nm spatial resolut

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Picart, Pascal. "Recent advances in speckle decorrelation modeling and processing in digital holographic interferometry." Photonics Letters of Poland 13, no. 4 (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 p

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Yang, Guoliang, Junhong Su, Yuan Li, Jialin Cai, and Yiren Li. "A Study of Resolution Improvement in Noncoherent Optical Coherence Imaging." Advances in Mathematical Physics 2022 (July 5, 2022): 1–12. http://dx.doi.org/10.1155/2022/3232323.

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Noncoherent light, as a common light source in life, can effectively avoid problems such as scattering noise caused by optical components incoherent light imaging, and through the design of the optical path can also trigger interference and holographic imaging of objects, allowing holography to be used in more fields. Various techniques have emerged for recording holograms using incoherent light sources as technology has developed. A recording method has been proposed that exploits the correlation between the object wave information and the Fresnel band sheet to achieve incoherent hologram rec

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Yu, Panpan, Yifan Liu, Yijing Wu, et al. "Large-FOV scattering-assisted holographic projection by enhanced sampling of transmission matrix." Applied Physics Letters 122, no. 6 (2023): 061104. http://dx.doi.org/10.1063/5.0137279.

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Based on wavefront shaping, scattering materials provide a unique tool to break the trade-off between the viewing angle and field of view (FOV) for three-dimensional holographic projections. However, large-size image projection is limited by the low sampling ability of the transmission matrix (TM) of the scattering medium. Here, we propose a disperse and montage sampling strategy to access the TM for large-size image projection by scattering-assisted holography. Compared with the conventional TM sampling methods, our method achieves control of the output field with an enlarged FOV and improved

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JANG, Jaeduck, Jung Hoon PARK, KyooHyun KIM, Hyeonseung YU, and YongKeun PARK. "Super-resolution Holographic Imaging Techniques Using a Synthetic Aperture." Physics and High Technology 21, no. 5 (2012): 27. http://dx.doi.org/10.3938/phit.21.023.

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Yoneda, Naru, Jung-Ping Liu, Osamu Matoba, Yusuke Saita, and Takanori Nomura. "Computational Optical Scanning Holography." Photonics 11, no. 4 (2024): 347. http://dx.doi.org/10.3390/photonics11040347.

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Holographic techniques are indispensable tools for modern optical engineering. Over the past two decades, research about incoherent digital holography has continued to attract attention. Optical scanning holography (OSH) can obtain incoherent holograms using single-pixel detection and structured illumination with Fresnel zone patterns (FZPs). Particularly by changing the size of a detector, OSH can also obtain holograms under coherently illuminated conditions. Since 1979, OSH has continuously evolved. According to the evolution of semiconductor technology, spatial light modulators (SLMs) come

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Nam Kim, Nam Kim, Md Ashraful Alam Md. Ashraful Alam, Le Thanh Bang Le Thanh Bang, Anh-Hoang Phan Anh-Hoang Phan, Mei-Lan Piao Mei-Lan Piao, and Munkh-Uchral Erdenebat Munkh-Uchral Erdenebat. "Advances in the light field displays based on integral imaging and holographic techniques (Invited Paper)." Chinese Optics Letters 12, no. 6 (2014): 060005–60009. http://dx.doi.org/10.3788/col201412.060005.

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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.

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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 m

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Petrov, Viktor, Anastsiya Pogoda, Vladimir Sementin, et al. "Advances in Digital Holographic Interferometry." Journal of Imaging 8, no. 7 (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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Smith, D., M. Leach, and A. J. Sambell. "Microwave indirect holographic imaging using an adaptation of optical techniques." IEEE Microwave and Wireless Components Letters 13, no. 9 (2003): 379–81. http://dx.doi.org/10.1109/lmwc.2003.817134.

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Poon, Ting-Chung, Yaping Zhang, Liangcai Cao, and Hiroshi Yoshikawa. "Editorial on Special Issue “Holography, 3-D Imaging and 3-D Display”." Applied Sciences 10, no. 20 (2020): 7057. http://dx.doi.org/10.3390/app10207057.

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Modern holographic techniques have been successfully applied in many important areas, such as 3D inspection, 3D microscopy, metrology and profilometry, augmented reality, and industrial informatics [...]

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Gao, Yuki, Maryam Ravan, and Reza K. Amineh. "Fast, Robust, and Low-Cost Microwave Imaging of Multiple Non-Metallic Pipes." Electronics 10, no. 15 (2021): 1762. http://dx.doi.org/10.3390/electronics10151762.

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The use of non-metallic pipes and composite components that are low-cost, durable, light-weight, and resilient to corrosion is growing rapidly in various industrial sectors such as oil and gas industries in the form of non-metallic composite pipes. While these components are still prone to damages, traditional non-destructive testing (NDT) techniques such as eddy current technique and magnetic flux leakage technique cannot be utilized for inspection of these components. Microwave imaging can fill this gap as a favorable technique to perform inspection of non-metallic pipes. Holographic microwa

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Baek, YoonSeok, KyeoReh Lee, Jeonghun Oh, and YongKeun Park. "Speckle-Correlation Scattering Matrix Approaches for Imaging and Sensing through Turbidity." Sensors 20, no. 11 (2020): 3147. http://dx.doi.org/10.3390/s20113147.

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The development of optical and computational techniques has enabled imaging without the need for traditional optical imaging systems. Modern lensless imaging techniques overcome several restrictions imposed by lenses, while preserving or even surpassing the capability of lens-based imaging. However, existing lensless methods often rely on a priori information about objects or imaging conditions. Thus, they are not ideal for general imaging purposes. The recent development of the speckle-correlation scattering matrix (SSM) techniques facilitates new opportunities for lensless imaging and sensin

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Model, Michael A. "Imaging the Cell's Third Dimension." Microscopy Today 20, no. 3 (2012): 32–37. http://dx.doi.org/10.1017/s1551929512000247.

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Shape and size are among the most basic and obvious characteristics of a cell (or of any physical object, for that matter). When a cell is observed through a microscope, one only sees its projection onto the image plane. Rather paradoxically, there are no easy techniques to visualize and measure cell's third dimension—thickness. For example, confocal microscopy requires fluorescent labeling, multiple scanning with a high-power objective, possibly correction for the refractive index mismatch, and even then, generation of a complete three-dimensional profile is not very straightforward or precis

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Verrier, Nicolas, Matthieu Debailleul, and Olivier Haeberlé. "Recent Advances and Current Trends in Transmission Tomographic Diffraction Microscopy." Sensors 24, no. 5 (2024): 1594. http://dx.doi.org/10.3390/s24051594.

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Optical microscopy techniques are among the most used methods in biomedical sample characterization. In their more advanced realization, optical microscopes demonstrate resolution down to the nanometric scale. These methods rely on the use of fluorescent sample labeling in order to break the diffraction limit. However, fluorescent molecules’ phototoxicity or photobleaching is not always compatible with the investigated samples. To overcome this limitation, quantitative phase imaging techniques have been proposed. Among these, holographic imaging has demonstrated its ability to image living mic

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Brito Carcaño, Jesús E., Stéphane Cuenat, Belal Ahmad, et al. "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.

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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

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Sun, H., P. W. Benzie, N. Burns, D. C. Hendry, M. A. Player, and J. Watson. "Underwater digital holography for studies of marine plankton." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 366, no. 1871 (2008): 1789–806. http://dx.doi.org/10.1098/rsta.2007.2187.

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Conventional and digital holographies are proving to be increasingly important for studies of marine zooplankton and other underwater biological applications. This paper reports on the use of a subsea digital holographic camera (eHoloCam) for the analysis and identification of marine organisms and other subsea particles. Unlike recording on a photographic film, a digital hologram (e-hologram) is recorded on an electronic sensor and reconstructed numerically in a computer by simulating the propagation of the optical field in space. By comparison with other imaging techniques, an e-hologram has

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Smith, D., M. Leach, M. Elsdon, and S. Foti. "Indirect Holographic Techniques for Determining Antenna Radiation Characteristics and Imaging Aperture Fields." IEEE Antennas and Propagation Magazine 49, no. 1 (2007): 54–67. http://dx.doi.org/10.1109/map.2007.370982.

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Qin, Shaohan. "Capturing the 3D secrets of a flickering candle: Based on digital holographic microscopy." Theoretical and Natural Science 34, no. 1 (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

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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 (2022): 706–15. http://dx.doi.org/10.1515/jisys-2022-0043.

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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 minimiz

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Hagemann, Johannes, and Tim Salditt. "The fluence–resolution relationship in holographic and coherent diffractive imaging." Journal of Applied Crystallography 50, no. 2 (2017): 531–38. http://dx.doi.org/10.1107/s1600576717003065.

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This work presents a numerical study of the fluence–resolution behaviour for two coherent lensless X-ray imaging techniques. To this end the fluence–resolution relationship of inline near-field holography and far-field coherent diffractive imaging are compared in numerical experiments. To achieve this, the phase reconstruction is carried out using iterative phase-retrieval algorithms on simulated noisy data. Using the incident photon fluence on the specimen as the control parameter, the achievable resolution for two example phantoms (cell and bitmap) is studied. The results indicate the superi

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Fioranelli, Massimo, Aroonkumar Beesham, and Alireza Sepehri. "A Proposal for an Ultrasound/Sound Holographic Microscope Using Entangled Mobile Phone Inductors." Ultrasound International Open 08, no. 02 (2022): E53—E58. http://dx.doi.org/10.1055/a-1932-8287.

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AbstractIn this study we propose a model for building a holographic ultrasound microscope. In this model two mobile phones are first connected by waves and techniques like the WhatsApp waves. If the mobile phones are close to each other, their inductors and speakers become entangled, they exchange electromagnetic and sound waves, and they vibrate many times with each other. Objects placed between two mobile phones change the sound waves and electromagnetic waves and appear as holographic images within the inductors and also on the plastic of the speakers. To see these images, a hologram machin

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Nygate, Yoav N., Mattan Levi, Simcha K. Mirsky, et al. "Holographic virtual staining of individual biological cells." Proceedings of the National Academy of Sciences 117, no. 17 (2020): 9223–31. http://dx.doi.org/10.1073/pnas.1919569117.

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Many medical and biological protocols for analyzing individual biological cells involve morphological evaluation based on cell staining, designed to enhance imaging contrast and enable clinicians and biologists to differentiate between various cell organelles. However, cell staining is not always allowed in certain medical procedures. In other cases, staining may be time-consuming or expensive to implement. Staining protocols may be operator-sensitive, and hence may lead to varying analytical results, as well as cause artificial imaging artifacts or false heterogeneity. We present a deep-learn

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Karuppannan, Anand, Vijayakumar E, Bhanupriya P, and Suneel Kumar Asileti. "HOLOGRAPHIC VIDEO PROCESSING WITH MULTIMEDIA INTEGRATION USING AI AND MACHINE LEARNING ALGORITHMS." ICTACT Journal on Image and Video Processing 15, no. 2 (2024): 3448–53. https://doi.org/10.21917/ijivp.2024.0488.

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The rise of holographic video processing has transformed multimedia experiences by providing highly immersive and realistic visuals. However, efficiently processing these high-dimensional holographic datasets poses significant computational challenges. Current methods often struggle with latency, scalability, and maintaining quality during real-time rendering. Addressing these limitations requires the integration of advanced Artificial Intelligence (AI) and Machine Learning (ML) techniques. This research introduces a novel approach leveraging an adaptive Support Vector Machine (adaSVM) algorit

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De Angelis, A., S. Managò, M. A. Ferrara, M. Napolitano, G. Coppola, and A. C. De Luca. "Combined Raman Spectroscopy and Digital Holographic Microscopy for Sperm Cell Quality Analysis." Journal of Spectroscopy 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/9876063.

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The diagnosis of male infertility is vastly complex. To date, morphology, motility, and concentration have been used as key parameters to establish the sperm normality and achieve pregnancy both in natural and in assisted fecundation. However, spermatozoa from infertile men could present a variety of alterations, such as DNA fragmentation, alterations of chromatin structure, and aneuploidy, which have been demonstrated to decrease reproductive capacity of men. Therefore, the ability to see detailed relationships between morphology and physiology in selected spermatozoa with submicrometric reso

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Coppola, Giuseppe, and Maria Antonietta Ferrara. "Polarization-Sensitive Digital Holographic Imaging for Characterization of Microscopic Samples: Recent Advances and Perspectives." Applied Sciences 10, no. 13 (2020): 4520. http://dx.doi.org/10.3390/app10134520.

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Polarization-sensitive digital holographic imaging (PS-DHI) is a recent imaging technique based on interference among several polarized optical beams. PS-DHI allows simultaneous quantitative three-dimensional reconstruction and quantitative evaluation of polarization properties of a given sample with micrometer scale resolution. Since this technique is very fast and does not require labels/markers, it finds application in several fields, from biology to microelectronics and micro-photonics. In this paper, a comprehensive review of the state-of-the-art of PS-DHI techniques, the theoretical prin

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Kim, Hyun-Woo, Myungjin Cho, and Min-Chul Lee. "Image Processing Techniques for Improving Quality of 3D Profile in Digital Holographic Microscopy Using Deep Learning Algorithm." Sensors 24, no. 6 (2024): 1950. http://dx.doi.org/10.3390/s24061950.

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Digital Holographic Microscopy (DHM) is a 3D imaging technology widely applied in biology, microelectronics, and medical research. However, the noise generated during the 3D imaging process can affect the accuracy of medical diagnoses. To solve this problem, we proposed several frequency domain filtering algorithms. However, the filtering algorithms we proposed have a limitation in that they can only be applied when the distance between the direct current (DC) spectrum and sidebands are sufficiently far. To address these limitations, among the proposed filtering algorithms, the HiVA algorithm

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Brunnhofer, Georg, Isabella Hinterleitner, Alexander Bergmann, and Martin Kraft. "A Comparison of Different Counting Methods for a Holographic Particle Counter: Designs, Validations and Results." Sensors 20, no. 10 (2020): 3006. http://dx.doi.org/10.3390/s20103006.

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Digital Inline Holography (DIH) is used in many fields of Three-Dimensional (3D) imaging to locate micro or nano-particles in a volume and determine their size, shape or trajectories. A variety of different wavefront reconstruction approaches have been developed for 3D profiling and tracking to study particles’ morphology or visualize flow fields. The novel application of Holographic Particle Counters (HPCs) requires observing particle densities in a given sampling volume which does not strictly necessitate the reconstruction of particles. Such typically spherical objects yield circular intere

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Taghavi, Mohammadrasoul, and Edwin A. Marengo. "Optical-Theorem-Based Holography for Target Detection and Tracking." Sensors 25, no. 7 (2025): 2203. https://doi.org/10.3390/s25072203.

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The development of robust, real-time optical methods for the detection and tracking of particles in complex, multiple-scattering media is a problem of practical importance in a number of fields, including environmental monitoring, air quality assessment, and homeland security. In this paper, we develop a holographic, optical-theorem-based method for the detection of particles embedded in complex environments where wavefronts undergo strong multiple scattering. The proposed methodology is adaptive to a complex medium, which is integral to the sensing apparatus and thereby enables constant monit

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Spring, K. R. "Multispectral Imaging in Light Microscopy." Microscopy and Microanalysis 4, S2 (1998): 126–27. http://dx.doi.org/10.1017/s1431927600020754.

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Many recent applications in light microscopy involve the use of multiple fluorophores or the delineation of signals arising from spectrally distinct sources. In microspectroscopy, it is always desirable to illuminate fluorescently-labeled microscopic specimens with monochromatic light as the narrowest possible excitation wavelength range usually results in the highest emission signal-to-noise ratio. Generation of polychromatic light from an arc lamp and selection of the excitation wavelength by interference filters or monochrometers are the most common techniques for excitation microspectroflu

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Takeda, Mitsuo, Alok Kumar Singh, Dinesh Narayana Naik, Giancarlo Pedrini, and Wolfgang Osten. "Holographic Correloscopy—Unconventional Holographic Techniques For Imaging a Three-Dimensional Object Through an Opaque Diffuser or Via a Scattering Wall: A Review." IEEE Transactions on Industrial Informatics 12, no. 4 (2016): 1631–40. http://dx.doi.org/10.1109/tii.2015.2503641.

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Zhao, Zhicheng, Yueqiang Hu, and Shanyong Chen. "A Review: Phase Measurement Techniques Based on Metasurfaces." Photonics 11, no. 11 (2024): 996. http://dx.doi.org/10.3390/photonics11110996.

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Phase carries crucial information about the light propagation process, and the visualization and quantitative measurement of phase have important applications, ranging from ultra-precision metrology to biomedical imaging. Traditional phase measurement techniques typically require large and complex optical systems, limiting their applicability in various scenarios. Optical metasurfaces, as flat optical elements, offer a novel approach to phase measurement by manipulating light at the nanoscale through light-matter interactions. Metasurfaces are advantageous due to their lightweight, multifuncti

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Kuś, Arkadiusz, Wojciech Krauze, and Małgorzata Kujawińska. "From digital holographic microscopy to optical coherence tomography – separate past and a common goal." Photonics Letters of Poland 13, no. 4 (2021): 91. http://dx.doi.org/10.4302/plp.v13i4.1130.

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In this paper we briefly present the history and outlook on the development of two seemingly distant techniques which may be brought close together with a unified theoretical model described as common k-space theory. This theory also known as the Fourier diffraction theorem is much less common in optical coherence tomography than its traditional mathematical model, but it has been extensively studied in digital holography and, more importantly, optical diffraction tomography. As demonstrated with several examples, this link is one of the important factors for future development of both techniq

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Charatis, G., G. E. Busch, B. K. F. Young, and R. E. Stewart. "Diagnostic Characterization of Laser-Irradiated dot Targets." International Astronomical Union Colloquium 102 (1988): 375–78. http://dx.doi.org/10.1017/s0252921100108139.

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AbstractWe have conducted a series of experiments at the KMS CHROMA facility using dot spectroscopy techniques to characterize uncertainties associated with spectral line ratio models commonly applied in determining electron temperatures and densities. Temperatures determined from the slope of the H-like free-bound continuum and densities via holographic interferometry, are compared to line ratio methods. Dot targets of (typically 100µmD Mg or Al) are irradiated with 2 to 40 × 1013W/cm2of 0.53µmlight. Time and spatial gradients are resolved using 4 diagnostics: a 4-frame holographic interferom

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Scharf, Elias, Robert Kuschmierz, and Jürgen Czarske. "Holographic lensless fiber endoscope with needle size using self-calibration." tm - Technisches Messen 86, no. 3 (2019): 144–50. http://dx.doi.org/10.1515/teme-2018-0087.

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AbstractEndoscopes enable optical keyhole access in many applications for instance in biomedicine. In general, coherent fiber bundles (CFB) are used in conjunction with rigid lens systems which determine a fixed image plane. However, the lens system limits the minimum diameter of the endoscope typically to several millimeters. Additionally, only pixelated two-dimensional amplitude patterns can be transferred due to phase scrambling between adjacent cores. These limitations can be overcome by digital optical elements. Thus, in principle thinner, lensless, holographic endoscopes with a three-dim

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Coened, W. M. J., A. J. E. M. Janssend, M. Op de Beeck, D. Van Dyck, E. J. Van Zwet, and H. W. Zandbergen. "Focus-variation image reconstruction in field-emission TEM." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 1070–71. http://dx.doi.org/10.1017/s0424820100151180.

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The use of a field emission gun (FEG) in high resolution TEM (HRTEM) improves the information limit much below the point resolution. This is due to the FEG’s high brightness and low energy spread which yield a very good coherence. In the area between point and information resolution of the FEG-TEM, image interpretation is complicated by the lens aberrations and focus effects, which cause scrambling of the information from the specimen. This problem is solved by ‘holographic’ techniques, which retrieve aberration-corrected amplitude and phase information of the electron wave ϕ at the exit plane

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Touloupas, Georgios, Annika Lauber, Jan Henneberger, Alexander Beck, and Aurélien Lucchi. "A convolutional neural network for classifying cloud particles recorded by imaging probes." Atmospheric Measurement Techniques 13, no. 5 (2020): 2219–39. http://dx.doi.org/10.5194/amt-13-2219-2020.

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Abstract. During typical field campaigns, millions of cloud particle images are captured with imaging probes. Our interest lies in classifying these particles in order to compute the statistics needed for understanding clouds. Given the large volume of collected data, this raises the need for an automated classification approach. Traditional classification methods that require extracting features manually (e.g., decision trees and support vector machines) show reasonable performance when trained and tested on data coming from a unique dataset. However, they often have difficulties in generaliz

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Chen, Yufan, Xuejuan Wu, Yang Chen, et al. "Lens-Free On-Chip Quantitative Phase Microscopy for Large Phase Objects Based on a Biplane Phase Retrieval Method." Sensors 25, no. 1 (2024): 3. https://doi.org/10.3390/s25010003.

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Lens-free on-chip microscopy (LFOCM) is a powerful computational imaging technology that combines high-throughput capabilities with cost efficiency. However, in LFOCM, the phase recovered by iterative phase retrieval techniques is generally wrapped into the range of −π to π, necessitating phase unwrapping to recover absolute phase distributions. Moreover, this unwrapping process is prone to errors, particularly in areas with large phase gradients or low spatial sampling, due to the absence of reliable initial guesses. To address these challenges, we propose a novel biplane phase retrieval (BPR

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Yamamoto, Kazuo, Tsukasa Hirayama, and Takayoshi Tanji. "Development of advanced electron holographic techniques and application to industrial materials and devices." Microscopy 62, suppl 1 (2013): S29—S41. http://dx.doi.org/10.1093/jmicro/dft006.

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Chan, Huang-Tian, and Chi-Ching Chang. "Decryption of Deterministic Phase-Encoded Digital Holography Using Convolutional Neural Networks." Photonics 10, no. 6 (2023): 612. http://dx.doi.org/10.3390/photonics10060612.

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Digital holographic encryption is an important information security technology. Traditional encryption techniques require the use of keys to encrypt information. If the key is lost, it is difficult to recover information, so new technologies that allow legitimate authorized users to access information are necessary. This study encrypts fingerprints and other data using a deterministic phase-encoded encryption system that uses digital holography (DPDH) and determines whether decryption is possible using a convolutional neural network (CNN) using the U-net model. The U-net is trained using a ser

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Rogers, Brian, Tatsiana Mikulchyk, Mohamed Oubaha, Dervil Cody, Suzanne Martin, and Izabela Naydenova. "Improving the Holographic Recording Characteristics of a Water-Resistant Photosensitive Sol–Gel for Use in Volume Holographic Optical Elements." Photonics 9, no. 9 (2022): 636. http://dx.doi.org/10.3390/photonics9090636.

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Continual improvements to holographic recording materials make the development of volume holographic optical elements increasingly more attainable for applications where highly efficient, lightweight diffractive optical elements can replace conventional optics. A fast-curing, water resistant photosensitive sol–gel capable of volume holographic recording has recently drawn attention for its extreme environmental and physical robustness, in particular its water/moisture and scratch resistance. However, to date, the refractive index modulation has been limited. While water-resistant properties ar

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Phan, Robert, Michael P. Chae, David J. Hunter-Smith, and Warren Matthew Rozen. "Advances in perforator imaging through holographic CTA and augmented reality: a systematic review." Australasian Journal of Plastic Surgery 5, no. 1 (2022): 32–38. http://dx.doi.org/10.34239/ajops.v5n1.263.

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Introduction: Free tissue transfer has become a mainstay in reconstructive plastic surgery, and techniques to plan such surgery continue to evolve. Novel technologies and increases in computational power have enabled computed tomographic angiography (CTA)data augmentation onto patients to assist in pedicle identification and dissection. Given the rapidly evolving field and research in this domain, a systematic re-view was undertaken to establish the evidence for its usefulness in pedicle identification and dissection. Methods: An extensive search using keywords in EMBASE and PubMed with biblio

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Novta, Evgenije, Tijana Lainovic, Dusan Grujic, Jelena Komsic, Dejan Pantelic, and Larisa Blazic. "Novel biophotonics-based techniques in dental medicine - a literature review." Medical review 73, no. 11-12 (2020): 364–68. http://dx.doi.org/10.2298/mpns2012364n.

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Introduction. Biophotonics deals with interactions between light and biological matter, integrating knowledge of physics, chemistry, engineering, biology, and medicine for solving specific biomedical or life science problems. Due to the ability to provide non-invasive, highly sensitive tissue information and inducing specific localized tissue ablation, biophotonics-based technologies may be of utmost importance in improving dental healthcare. The aim of this review article is to give an overview of contemporary biophotonics-based technologies and their applications in dental research and clini

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Jonsson, P., I. Sillitoe, B. Dushaw, J. Nystuen, and J. Heltne. "Observing using sound and light – a short review of underwater acoustic and video-based methods." Ocean Science Discussions 6, no. 1 (2009): 819–70. http://dx.doi.org/10.5194/osd-6-819-2009.

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Abstract. This paper is a review which briefly describes a selection of acoustic observation techniques and certain aspects of underwater video technology suitable for observations in an underwater environment. The review is divided into two sections, one for each subject, where each section concludes with a discussion of the current challenges within the respective fields. The acoustic section of the review covers bathymetric and geometrical measurements, imaging sonars, subsurface penetrating profilers, positioning methods, acoustic underwater communication and sensor networks, and water spe

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Guo, Jiuyi. "The Latest Development of Synthetic Aperture Radar: An Overview." Applied and Computational Engineering 103, no. 1 (2024): 78–85. http://dx.doi.org/10.54254/2755-2721/103/20251726.

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Abstract. Synthetic Aperture Radar (SAR) technology enables high-resolution imaging regardless of weather conditions, offering immense potential for target detection and recognition. This paper reviews the latest advancements in SAR technology, highlighting key developments and applications. The limitations of traditional SAR imaging techniques, particularly the trade-off between resolution and swath width, have been addressed by High Resolution Wide Swath (HRWS) SAR, enabling simultaneous acquisition of high-resolution and wide-swath data. Multi-polarimetric SAR provides richer scattering inf

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