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Черёмхин, Павел Аркадьевич

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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Черёмхин
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Павел Аркадьевич
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2023 - 20244
22
4
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Тема: Computer-Generated Holography ×

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  • Уменьшенное изображение
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    Interpolation-Filtering Method for Image Improvement in Digital Holography
    (2024) Kozlov,A.V.; Cheremkhin,P.A.; Svistunov,A.S.; Rodin,V.G.; Starikov,R.S.; Evtikhiev,N.N.; Козлов, Александр Валерьевич; Черёмхин, Павел Аркадьевич; Свистунов, Андрей Сергеевич; Родин, Владислав Геннадьевич; Стариков, Ростислав Сергеевич; Евтихиев, Николай Николаевич
    Digital holography is actively used for the characterization of objects and 3D-scenes, tracking changes in medium parameters, 3D shape reconstruction, detection of micro-object positions, etc. To obtain high-quality images of objects, it is often necessary to register a set of holograms or to select a noise suppression method for specific experimental conditions. In this paper, we propose a method to improve filtering in digital holography. The method requires a single hologram only. It utilizes interpolation upscaling of the reconstructed image size, filtering (e.g., median, BM3D, or NLM), and interpolation to the original image size. The method is validated on computer-generated and experimentally registered digital holograms. Interpolation methods coefficients and filter parameters were analyzed. The quality is improved in comparison with digital image filtering up to 1.4 times in speckle contrast on the registered holograms and up to 17% and 29% in SSIM and NSTD values on the computer-generated holograms. The proposed method is convenient in practice since its realization requires small changes of standard filters, improving the quality of the reconstructed image.
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    DMD-based optical pattern recognition using holograms generated with the Hartley transform
    (2023) Cheremkhin, P. A.; Krasnov, V. V.; Rodin, V. G.; Starikov, R. S.; Черёмхин, Павел Аркадьевич; Родин, Владислав Геннадьевич; Стариков, Ростислав Сергеевич
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    What Binarization Method Is the Best for Amplitude Inline Fresnel Holograms Synthesized for Divergent Beams Using the Direct Search with Random Trajectory Technique?
    (2023) Ovchinnikov, A. S.; Krasnov, V. V.; Cheremkhin, P. A.; Rodin, V. G.; Savchenkova, E. A.; Starikov, R. S.; Evtikhiev, N. N.; Овчинников, Андрей Сергеевич; Черёмхин, Павел Аркадьевич; Родин, Владислав Геннадьевич; Савченкова, Екатерина Алексеевна; Стариков, Ростислав Сергеевич; Евтихиев, Николай Николаевич
    Fast reconstruction of holographic and diffractive optical elements (DOE) can be implemented by binary digital micromirror devices (DMD). Since micromirrors of the DMD have two positions, the synthesized DOEs must be binary. This work studies the possibility of improving the method of synthesis of amplitude binary inline Fresnel holograms in divergent beams. The method consists of the modified Gerchberg–Saxton algorithm, Otsu binarization and direct search with random trajectory technique. To achieve a better quality of reconstruction, various binarization methods were compared. We performed numerical and optical experiments using the DMD. Holograms of halftone image with size up to 1024 × 1024 pixels were synthesized. It was determined that local and several global threshold methods provide the best quality. Compared to the Otsu binarization used in the original method of the synthesis, the reconstruction quality (MSE and SSIM values) is improved by 46% and the diffraction efficiency is increased by 27%.
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    Computer-Generated Holography Methods for Data Page Reconstruction Using Phase-Only Medium
    (2023) Minikhanov, T. Z.; Zlokazov, E. Y.; Cheremkhin, P. A.; Starikov, R. S.; Evtikhiev, N. N.; Злоказов, Евгений Юрьевич; Черёмхин, Павел Аркадьевич; Стариков, Ростислав Сергеевич; Евтихиев, Николай Николаевич
    Achievements in the field of high-speed spatial modulation electrooptic components provide the possibility to create perspective optical-digital diffractive systems for information storage and processing that outperform modern electronic counterparts by utilizing throughput, energy efficiency, and reliability. This work presents a study of computer-generated holography methods that allow the formation of spatially-modulated information signals (data pages) with high accuracy using phase-only spatial light modulators. Computer-generated Fourier hologram fringe patterns were formed using bipolar intensity and double-phase coding. Numerical and experimental results of both methods’ implementation are compared. It was determined that bipolar intensity holograms provide higher data density on the data page if complex digital modulation methods such as multilevel amplitude and phase or quadrature modulation are used to represent data points. Double-phase coding can offer perspective for multilevel amplitude or multilevel intensity modulated data page reconstruction; however, exact control of phase modulation characteristics is required to obtain high reconstruction quality.