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Multifocal metalens for detecting several topological charges at different wavelengths 用于探测不同波长拓扑电荷的多焦超透镜
IF 1
Computer Optics Pub Date : 2023-04-01 DOI: 10.18287/2412-6179-co-1170
A. Nalimov, V. Kotlyar
{"title":"Multifocal metalens for detecting several topological charges at different wavelengths","authors":"A. Nalimov, V. Kotlyar","doi":"10.18287/2412-6179-co-1170","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1170","url":null,"abstract":"A combined high-aperture metalens in a thin silicon nitride film, which consists of two inclined sector metalens, is considered. Each sector metalens consists of a set of binary subwavelength gratings. The diameter of the lens is 14 μm. It has been shown using time-domain finite difference method that the metalens can simultaneously detect optical vortices with two topological charges –1 and –2, in almost the entire visible wavelength range. The metalens can distinguish several wavelengths that are focused at different points in the focal plane: a 1 nm change in wavelength results in a focal spot shift of about 4 nm. When the metalens is illuminated by a Gaussian beam with left-handed circular polarization, two optical vortices with topological charges 1 and 2 are simultaneously formed at 6 nm between each other at focal distance equals 6 nm. This metalens can be used to increase information in transmission channel in wireless telecommunication systems by selecting the space-time modes of laser radiation with different topological charges and different wavelengths. The considered microlens is an example of a compact demultiplexer.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84187045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Spectral reflectance analysis of abandoned agricultural lands in the Central Russian forest-steppe using Sentinel-2 satellite data 利用Sentinel-2卫星数据对俄罗斯中部森林草原废弃农田的光谱反射分析
IF 1
Computer Optics Pub Date : 2023-04-01 DOI: 10.18287/2412-6179-co-1160
E. Terekhin
{"title":"Spectral reflectance analysis of abandoned agricultural lands in the Central Russian forest-steppe using Sentinel-2 satellite data","authors":"E. Terekhin","doi":"10.18287/2412-6179-co-1160","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1160","url":null,"abstract":"The article considers the spectral response of post-agrogenic landscapes in the forest-steppe zone based on Sentinel-2 data. The study was carried out on the territory of the Central Chernozem region. The type of forest that forms on abandoned agricultural land has a statistically significant effect on the spectral response in most Sentinel-2 bands. The reflectance of abandoned lands with deciduous and coniferous species is statistically significantly different in most bands. The reflectance of abandoned lands with mixed forests does not differ statistically significantly from other types of post-agrogenic landscapes. The reflectance of abandoned lands is inversely related to their forest cover in most Sentinel-2 bands. The strongest correlation with forest cover is typical for red (Band 4) and SWIR (Band 11, 12) ranges for all post-agrogenic landscape types. In the same bands, there are statistically significant differences between most of forest cover gradations of post-agrogenic landscapes. The established patterns make it possible to use the reflectance in the red (Band 4) and SWIR MSI bands (11, 12) to assess the forest cover of post-agrogenic landscapes.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87811328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Method for copyright protection of deep neural networks using digital watermarking 基于数字水印的深度神经网络版权保护方法
Computer Optics Pub Date : 2023-04-01 DOI: 10.18287/2412-6179-co-1193
Y.D. Vybornova
{"title":"Method for copyright protection of deep neural networks using digital watermarking","authors":"Y.D. Vybornova","doi":"10.18287/2412-6179-co-1193","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1193","url":null,"abstract":"The article proposes a new method of copyright protection for deep neural networks. The main idea of the method is to embed digital watermarks into the protected model by retraining it on a unique set of pseudo-holographic images (pseudo-holograms). A pseudo-hologram is a two-dimensional sinusoidal signal that encodes a binary sequence of arbitrary length. By changing the phase of each sinusoid, it is possible to form various pseudo-hologram images based on a single bit sequence. The proposed approach to embedding is to generate a training sample in such a way that pseudo-holograms formed on the basis of one sequence fall into the same class. In this case, each class will correspond to different bit sequences. Verification of the digital watermark is carried out by applying various pseudo-holograms to the input of the model and checking whether the hidden sequence corresponds to a certain class. Experimental studies confirm the efficiency of the method and its compliance with all quality criteria established for the methods of neural network watermarking.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136148917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A metalens-based optical polarization sensor 一种基于超构透镜的光学偏振传感器
IF 1
Computer Optics Pub Date : 2023-04-01 DOI: 10.18287/2412-6179-co-1254
A. Nalimov, V. Kotlyar, S. Stafeev
{"title":"A metalens-based optical polarization sensor","authors":"A. Nalimov, V. Kotlyar, S. Stafeev","doi":"10.18287/2412-6179-co-1254","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1254","url":null,"abstract":"An optical microsensor of the laser light polarization state based on a metalens is proposed. Well-known polarization sensors based on metasurfaces usually transmit different types of polarization at different angles to the optical axis. The polarization sensor proposed in this work forms different patterns for different polarization types at the metalens focus. Specifically, the left-handed circular polarization at the focus forms a ring-shaped spot, the right-handed circular polarization - a round focal spot, and linear polarization forms an elliptical spot with two side lobes. Moreover, the angle of inclination of the elliptical focal spot corresponds to the angle of inclination of the initial E-vector of the linearly polarized beam. The simulation is consistent with theoretical predictions. A 30-μm metalens with a low aspect ratio, high numerical aperture, and short focal length equal to the incident wavelength 633 nm in a 120-nm thick thin film of amorphous silicon is designed, fabricated and characterized.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81723756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The basic assembly of skeletal models in the fall detection problem 基本装配骨骼模型中的跌倒检测问题
IF 1
Computer Optics Pub Date : 2023-04-01 DOI: 10.18287/2412-6179-co-1158
O. Seredin, A. Kopylov, E. Surkov, S. Huang
{"title":"The basic assembly of skeletal models in the fall detection problem","authors":"O. Seredin, A. Kopylov, E. Surkov, S. Huang","doi":"10.18287/2412-6179-co-1158","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1158","url":null,"abstract":"The paper considers the appliance of the featureless approach to the human activity recognition problem, which exclude the direct anthropomorphic and visual characteristics of human figure from further analysis and thus increase the privacy of the monitoring system. A generalized pairwise comparison function of two human skeletal models, invariant to the sensor type, is used to project the object of interest to the secondary feature space, formed by the basic assembly of skeletons. A sequence of such projections in time forms an activity map, which allows an application of deep learning methods based on convolution neural networks for activity recognition. The proper ordering of skeletal models in a basic assembly plays an important role in secondary space design. The study of ordering of the basic assembly by the shortest unclosed path algorithm and correspondent activity maps for video streams from the TST Fall Detection v2 database are presented.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83360460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Modern automatic recognition technologies for visual communication tools 现代自动识别技术的视觉沟通工具
IF 1
Computer Optics Pub Date : 2023-04-01 DOI: 10.18287/2412-6179-co-1154
V. Yachnaya, V. Lutsiv, R. Malashin
{"title":"Modern automatic recognition technologies for visual communication tools","authors":"V. Yachnaya, V. Lutsiv, R. Malashin","doi":"10.18287/2412-6179-co-1154","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1154","url":null,"abstract":"Communication refers to a wide range of different behaviors and activities aimed at handing over information. The communication process includes verbal, paraverbal and non-verbal components, conveying the informational part of a message and its emotional part respectively. A complex analysis of all communication components makes it possible to evaluate not only the content, but also the situational context of what is being said, as well as to identify additional factors inherent in the mental and somatic state of the speaker. There are several methods of conveying a verbal message, among which are oral and gestural speech (such as the sign language and fingerspelling). Various forms of communication can be contained in multiple data transmission channels, such as audio or video channels. The review is concerned with video data analysis systems, as the audio channel is incapable of non-verbal components transmission that contribute supplemental details. The article analyzes databases of static and dynamic images and systems, developed to recognize the verbal component conveyed by oral and gestural speech, as well as systems that evaluate paraverbal and non-verbal components of communication. Challenges of designing such databases and systems are specified. Prospective directions in complex analysis of all communication components and its combinations for the most complete evaluation of messages are defined.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76611664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Near real-time animal action recognition and classification 接近实时的动物动作识别和分类
IF 1
Computer Optics Pub Date : 2023-04-01 DOI: 10.18287/2412-6179-co-1138
A. D. Egorov, M. S. Reznik
{"title":"Near real-time animal action recognition and classification","authors":"A. D. Egorov, M. S. Reznik","doi":"10.18287/2412-6179-co-1138","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1138","url":null,"abstract":"In computer vision, identification of actions of an object is considered as a complex and relevant task. When solving the problem, one requires information on the position of key points of the object. Training models that determine the position of key points requires a large amount of data, including information on the position of these key points. Due to the lack of data for training, the paper provides a method for obtaining additional data for training, as well as an algorithm that allows highly accurate recognition of animal actions based on a small number of data. The achieved accuracy of determining the key points positions within a test sample is 92%. Positions of the key points define the action of the object. Various approaches to classifying actions by key points are compared. The accuracy of identifying the action of the object in the image reaches 72.9 %.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83709315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-efficiency and easy-to-fabricate integrated plasmonic grating couplers for the telecommunication wavelength range 用于通信波长范围的高效率、易于制造的集成等离子体光栅耦合器
IF 1
Computer Optics Pub Date : 2023-04-01 DOI: 10.18287/2412-6179-co-1168
D. Zemtsov, A.K. Zemtsova, A. Smirnov, K.N. Garbuzov, R. Starikov, S. Kosolobov, V. Drachev
{"title":"High-efficiency and easy-to-fabricate integrated plasmonic grating couplers for the telecommunication wavelength range","authors":"D. Zemtsov, A.K. Zemtsova, A. Smirnov, K.N. Garbuzov, R. Starikov, S. Kosolobov, V. Drachev","doi":"10.18287/2412-6179-co-1168","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1168","url":null,"abstract":"The paper describes results of the numerical simulation and experimental characterization of plasmonic gratings and waveguides in the optical range of 1520 – 1630 nm. Gold structures were coated with a 630-nm thick tetraethylorthosilicate layer to achieve higher coupling efficiency for plasmonic gratings using lensed optical probes. We experimentally demonstrated gold input/output plasmonic gratings with an efficiency of about – 3.8 ± 0.2 dB per grating. The measured loss of the plasmonic mode propagating over the surface of the gold waveguide was 0.14 ± 0.02 dB / μm. The work was carried out with the aim of studying integrated plasmonic structures for the development of a hybrid photonic-plasmonic integrated technology.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85994688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Sharp focusing of on-axis superposition of a high-order cylindrical vector beam and a beam with linear polarization 高阶圆柱矢量光束与线偏振光束轴上叠加的锐利聚焦
IF 1
Computer Optics Pub Date : 2023-02-01 DOI: 10.18287/2412-6179-co-1165
Котляр, Стафеев, Зайцев, Королёва, Московское шоссе
{"title":"Sharp focusing of on-axis superposition of a high-order cylindrical vector beam and a beam with linear polarization","authors":"Котляр, Стафеев, Зайцев, Королёва, Московское шоссе","doi":"10.18287/2412-6179-co-1165","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1165","url":null,"abstract":"In this work, the sharp focusing of a laser beam whose initial polarization pattern is formed by superposition of a cylindrical mth-order vector beam and a homogeneous linearly polarized beam is considered theoretically and numerically. Although in the source plane of such a beam both the angular spin momentum and the third Stokes parameter are equal to zero, we reveal that given odd m, subwavelength local regions are formed in the focal plane, where transverse vortex energy flows occur and the third Stokes parameter (the on-axis component of the angular spin momentum) is non-zero. Thus, at odd m, at the focus of such a beam there are – sub-regions with elliptical polarization of light with alternating handedness in the adjacent sub-regions (clockwise and counterclockwise). This phenomenon can be interpreted as a variant of an optical Hall effect. We note that at even m, the field at the focus is linearly polarized at every point and no transverse energy flow is observed.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82242946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Design of optical elements for an extended light source 扩展光源光学元件的设计
IF 1
Computer Optics Pub Date : 2023-02-01 DOI: 10.18287/2412-6179-co-1178
E. Byzov, L. Doskolovich, S. Kravchenko, M. A. Moiseev, N. L. Kazanskiy
{"title":"Design of optical elements for an extended light source","authors":"E. Byzov, L. Doskolovich, S. Kravchenko, M. A. Moiseev, N. L. Kazanskiy","doi":"10.18287/2412-6179-co-1178","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1178","url":null,"abstract":"Using the previously developed optimization method for an extended light source [Byzov EV, Kravchenko SV, Moiseev MA, Bezus EA, Doskolovich LL. Optimization method for designing double-surface refractive optical elements for an extended light source. Opt Express 2020; 28(17): 24431-24443. DOI: 10.1364/OE.400609], we designed a compact refractive optical element (the ratio of the element height to the light source size being 1.55) providing a uniform illuminance distribution in a shifted rectangular region. An application of the optimization method for calculating the so-called TIR-elements, exploiting the phenomenon of the total internal reflection of rays, is considered. For an extended light source, compact TIR-elements with freeform exit surfaces that generate uniform illuminance distributions in a rectangular region are designed. The results of the work show promise for a wide class of problems of designing compact optical elements for light-emitting diodes.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88754617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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