Персона: 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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- ПубликацияТолько метаданныеComparative appraisal of global and local thresholding methods for binarisation of off-axis digital holograms(2019) Cheremkhin, P. A.; Kurbatova, E. A.; Черёмхин, Павел Аркадьевич© 2018 Elsevier Ltd Binary digital and computer-generated holograms are used in a number of digital micromirror device (DMD) applications, including holographic displays, media characterisation, optical encryption, and others. Binarisation is one of the most simple and efficient methods of hologram compression. In this paper, 12 local and 18 global thresholding techniques of different groups were analysed and compared based on attribute similarity, clustering, entropy, histogram shape, and local adaptive factors. Optically recorded off-axis digital holograms of different objects were binarised using these methods. The amplitude quality of the obtained reconstructed images was compared using PSNR and SSIM values. The clustering-based methods achieved the highest quality. The results of binarisation by global and local methods were comparable on average.
- ПубликацияТолько метаданныеOptical encryption of images in spatially incoherent light using DMD modulator(2019) Molodtsov, D. Yu.; Cheremkhin, P. A.; Krasnov, V. V.; Rodin, V. G.; Черёмхин, Павел Аркадьевич; Родин, Владислав Геннадьевич© OSA 2019 © 2019 The Author(s)Scheme of real time optical encryption using DMD modulator is described. Experimental results of optical encryption of images in spatially incoherent light are demonstrated.
- ПубликацияТолько метаданныеBinarization of digital holograms by thresholding and error diffusion techniques(2019) Cheremkhin, P. A.; Kurbatova, E. A.; Черёмхин, Павел Аркадьевич© OSA 2019 © 2019 The Author(s)Binarization of holograms is used for the tasks of data compression, digital micromirror device (DMD) application, and etc. 50 non-iterative local, global thresholding and error diffusion binarization methods were analyzed and applied to optically recorded holograms.
- ПубликацияОткрытый доступВлияние характеристик регистрирующих фотосенсоров на качество восстановления изображений цифровыми голограммами Френеля(НИЯУ МИФИ, 2013) Черёмхин, П. А.; Черёмхин, Павел Аркадьевич; Евтихиев, Н. Н.
- ПубликацияОткрытый доступWavelet compression of off-axis digital holograms using real/imaginary and amplitude/phase parts(2019) Cheremkhin, P. A.; Kurbatova, E. A.; Черёмхин, Павел Аркадьевич© 2019, The Author(s). Compression of digital holograms allows one to store, transmit, and reconstruct large sets of holographic data. There are many digital image compression methods, and usually wavelets are used for this task. However, many significant specialties exist for compression of digital holograms. As a result, it is preferential to use a set of methods that includes filtering, scalar and vector quantization, wavelet processing, etc. These methods in conjunction allow one to achieve an acceptable quality of reconstructed images and significant compression ratios. In this paper, wavelet compression of amplitude/phase and real/imaginary parts of the Fourier spectrum of filtered off-axis digital holograms is compared. The combination of frequency filtering, compression of the obtained spectral components, and extra compression of the wavelet decomposition coefficients by threshold processing and quantization is analyzed. Computer-generated and experimentally recorded digital holograms are compressed. The quality of the obtained reconstructed images is estimated. The results demonstrate the possibility of compression ratios of 380 using real/imaginary parts. Amplitude/phase compression allows ratios that are a factor of 2–4 lower for obtaining similar quality of reconstructed objects.