Computer Optics最新文献_第10页

Calculation of quantum characteristics based on the classical solution of the diffraction problem in a resonator with a dielectric plate 基于介电板谐振腔衍射问题经典解的量子特性计算

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Computer Optics Pub Date : 2022-10-01 DOI: 10.18287/2412-6179-co-1174

S. Kharitonov, N. L. Kazanskiy, S. G. Volotovsky, S. Khonina

引用次数: 2

Investigation of the operating conditions influence on the optical telescope performance when capturing star images 研究了光学望远镜拍摄星象时工作条件对其性能的影响

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Computer Optics Pub Date : 2022-10-01 DOI: 10.18287/2412-6179-co-1105

S. V. Tsaplin, I. Belokonov, S. A. Bolychev, A. Romanov

引用次数: 0

Synthesis of the rotational blur kernel in a digital image using measurements of a triaxial gyroscope 利用三轴陀螺仪的测量合成数字图像中的旋转模糊核

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Computer Optics Pub Date : 2022-10-01 DOI: 10.18287/2412-6179-co-1081

N. Vasilyuk

{"title":"Synthesis of the rotational blur kernel in a digital image using measurements of a triaxial gyroscope","authors":"N. Vasilyuk","doi":"10.18287/2412-6179-co-1081","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1081","url":null,"abstract":"A method for calculating of a blur kernel arising from the rotation of a digital camera is proposed. The rotation is measured with a three-axis gyroscope attached to the camera. Differential equations of a continuous trajectory of the rotational blur starting from a selected pixel are obtained. These equations are presented both in the form of an explicit system of differential equations for the blur curve in the focal plane and in the form of a matrix equation for the increment of the camera attitude. An expression is given for the integral of the energy illumination from a point light source along the continuous blur trajectory. The integral takes into account the point spread function and the aperture functions of individual photosensitive cells of the photodetector array. The calculation of the integral values for all photosensitive cells illuminated with the point source gives a discrete kernel of rotational blur starting at the selected pixel. Algorithms for the numerical integration of the blur equations are described. The analysis of the blur equations are carried out, characteristic features of the kernels are highlighted and their non-homogeneity is shown, with the kernels of rotational blur revealed not to coincide with each other for different pixels. An example of the synthesis of the blur kernels for given rotation parameters of the digital camera is given.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":"98 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79267009","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

Technique of detecting cloudy objects in multispectral images 多光谱图像中浑浊物体的检测技术

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Computer Optics Pub Date : 2022-10-01 DOI: 10.18287/2412-6179-co-1076

O. Nikolaeva

{"title":"Technique of detecting cloudy objects in multispectral images","authors":"O. Nikolaeva","doi":"10.18287/2412-6179-co-1076","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1076","url":null,"abstract":"A multistep algorithm to detect cloudy objects in multispectral images is presented. Clustering spatial pixels by the k-means method and applying spectral criteria of cloudy/clear sky to fragments of obtained clusters are carried out in each step of the algorithm. One cloudy object is found in one step. Results of testing the algorithm on images from a sensor HYPERION (199 non-zero spectral bands in a 425 nm – 2400 nm interval under high spatial resolution of 30 m) are given. Images with discontinuous cloud cover above different surfaces (ocean, vegetation, desert, town, snow) are considered. An alternative method, in which the same spectral criteria are applied to each pixel, is also used in testing. Cloud masks obtained by both algorithms are compared. Mean spectra of obtained cloudy objects are given. The presented algorithm finds 1-3 cloudy objects corresponding to the brightness distribution in RGB images. Using the alternative algorithm (without preliminary clustering) leads to detection errors on the cloud edges. Three quality parameters are offered. The ratio of dispersion of \"cloudy\" spectra to dispersion of \"clear\" spectra is found to be most informative. This ratio should be much less than 1 when using a good cloudy mask.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":"49 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72512763","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

Structured light transformations and orbital angular momentum control in a three-coil optical snake 三线圈光学蛇的结构光变换和轨道角动量控制

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Computer Optics Pub Date : 2022-10-01 DOI: 10.18287/2412-6179-co-1121

C. Alexeyev, S. Aliyeva, E. Barshak, B. Lapin, M.A. Yavorsrky

引用次数: 0

Decision-making support system for the personalization of retinal laser treatment in diabetic retinopathy 糖尿病视网膜病变视网膜激光治疗个体化决策支持系统

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Computer Optics Pub Date : 2022-10-01 DOI: 10.18287/2412-6179-co-1129

N. Ilyasova, D. Kirsh, N. Demin

{"title":"Decision-making support system for the personalization of retinal laser treatment in diabetic retinopathy","authors":"N. Ilyasova, D. Kirsh, N. Demin","doi":"10.18287/2412-6179-co-1129","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1129","url":null,"abstract":"In this work, we propose a decision-making support system for automatically mapping an effective photocoagulation pattern for the laser treatment of diabetic retinopathy. The purpose of research to create automated personalization of diabetic macular edema laser treatment. The results are based on analysis of large semi-structured data, methods and algorithms for fundus image processing. The technology improves the quality of retina laser coagulation in the treatment of diabetic macular edema, which is one of the main reasons for pronounced vision decrease. The proposed technology includes original solutions to establish an optimal localization of multitude burns by determining zones exposed to laser. It also includes the recognition of large amount of unstructured data on the anatomical and pathological locations' structures in the area of edema and data optical coherent tomography. As a result, a uniform laser application on the pigment epithelium of the affected retina is ensured. It will increase the treatment safety and its effectiveness, thus avoiding the use of more expensive treatment methods. Assessment of retinal lesions volume and quality will allow predicting the laser photocoagulation results and will contribute to the improvement of laser surgeon's skills. The architecture of a software complex comprises a number of modules, including image processing methods, algorithms for photocoagulation pattern mapping, and intelligent analysis methods.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":"26 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83976339","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

Size effect of gold nanoparticles on optical and electrical properties of plasmonic silicon solar cell 金纳米颗粒尺寸对等离子体硅太阳能电池光电性能的影响

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Computer Optics Pub Date : 2022-10-01 DOI: 10.18287/2412-6179-co-1089

J. Gulomov, R. Aliev, I. Gulomova

{"title":"Size effect of gold nanoparticles on optical and electrical properties of plasmonic silicon solar cell","authors":"J. Gulomov, R. Aliev, I. Gulomova","doi":"10.18287/2412-6179-co-1089","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1089","url":null,"abstract":"One of important tasks of the day is increasing the efficiency and decreasing the cost of the silicon solar cells. There is method of introducing of metal nanoparticles into solar cells to improve its absorption and reduce transmission as well as reflection coefficients. When metal nanoparticles are introduced into silicon solar cell, nanoplasmonic effect will occur. Nanoplasmonic effect lead to modification of light spectrum and generation of extra hot electrons. Nano-plasmonic effect strongly depends on size of nanoparticles. Therefore, in this paper, effect of gold nanoparticles size on properties of silicon solar cell has been studied by using simulation. Gold nanoparticles with sizes of 4 nm, 6 nm, 9 nm, 11 nm and 21 nm have been input into emitter region of silicon solar cell in order to use both of nanoplasmonic-electric and nanoplasmonic-optic effects for enhancing efficiency of silicon solar cell. Open circuit voltage didn't change when size of nanoparticles has been changed from 4 nm to 11 nm. It dropped by 0.017 V when size of nanoparticles was 21 nm. Short circuit current has been maximum 6.7 mA/cm2 at nanoparticle size of 11 nm and minimum 3.1 mA/cm2 at nanoparticle size of 21 nm. It has been found from obtained results that gold nanoparticle with size of 11 nm affected significantly on properties of silicon solar cell. Besides, thickness of silicon solar cell can be decreased without dropping of efficiency by introducing gold nanoparticles. Because, main part of photons is absorbed near to metal nanoparticles inputted region.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":"9 3 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87082029","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

Spatial and temporal characteristics of a four-wave radiation converter with due regard for Earth's gravity field acting on nanoparticles dissolved in a transparent liquid 考虑地球重力场作用于溶解在透明液体中的纳米粒子的四波辐射转换器的时空特性

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Computer Optics Pub Date : 2022-08-01 DOI: 10.18287/2412-6179-co-1109

M. V. Savelyev, A. D. Remzov

引用次数: 0

Document image analysis and recognition: a survey 文献图像分析与识别综述

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Computer Optics Pub Date : 2022-08-01 DOI: 10.18287/2412-6179-co-1020

V. Arlazarov, E.I. Andreeva, K. Bulatov, D. Nikolaev, O. Petrova, B. I. Savelev, O. Slavin

{"title":"Document image analysis and recognition: a survey","authors":"V. Arlazarov, E.I. Andreeva, K. Bulatov, D. Nikolaev, O. Petrova, B. I. Savelev, O. Slavin","doi":"10.18287/2412-6179-co-1020","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1020","url":null,"abstract":"This paper analyzes the problems of document image recognition and the existing solutions. Document recognition algorithms have been studied for quite a long time, but despite this, currently, the topic is relevant and research continues, as evidenced by a large number of associated publications and reviews. However, most of these works and reviews are devoted to individual recognition tasks. In this review, the entire set of methods, approaches, and algorithms necessary for document recognition is considered. A preliminary systematization allowed us to distinguish groups of methods for extracting information from documents of different types: single-page and multi-page, with text and handwritten contents, with a fixed template and flexible structure, and digitalized via different ways: scanning, photographing, video recording. Here, we consider methods of document recognition and analysis applied to a wide range of tasks: identification and verification of identity, due diligence, machine learning algorithms, questionnaires, and audits. The groups of methods necessary for the recognition of a single page image are examined: the classical computer vision algorithms, i.e., keypoints, local feature descriptors, Fast Hough Transforms, image binarization, and modern neural network models for document boundary detection, document classification, document structure analysis, i.e., text blocks and tables localization, extraction and recognition of the details, post-processing of recognition results. The review provides a description of publicly available experimental data packages for training and testing recognition algorithms. Methods for optimizing the performance of document image analysis and recognition methods are described.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":"100 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79487781","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

Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height 利用不同浮雕高度的环形光栅聚焦圆偏振和径向偏振超高斯光束的特性

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Computer Optics Pub Date : 2022-08-01 DOI: 10.18287/2412-6179-co-1131

D. Savelyev

{"title":"Peculiarities of focusing circularly and radially polarized super-Gaussian beams using ring gratings with varying relief height","authors":"D. Savelyev","doi":"10.18287/2412-6179-co-1131","DOIUrl":"https://doi.org/10.18287/2412-6179-co-1131","url":null,"abstract":"The focusing features of a super-Gaussian beam, as well as Laguerre-super-Gaussian (1,0) modes with radial and circular polarizations on ring gratings (direct and inverse) with a variable height of individual relief rings were investigated in this paper. The change in the height of the relief from the maximum height in the center to the minimum at the edges of the element (direct ring grating) is considered and the reverse case, when the maximum height of the relief was at the edges and the minimum in the center (reverse ring grating). The comparison was carried out with the action of a diffractive axicon with a comparable grating period. Numerical simulation was carried out by the finite differences in the time domain method. It was shown that the direction of change in the height of the relief rings of elements significantly affects the diffraction pattern in the near zone. In particular, for a super-Gaussian beam, the use of a direct ring grating made it possible to reduce the size of the focal spot by 18.7% for radial polarization ('sigma'=5 μm), the use of a reverse ring grating led to a decrease in the focal spot by 36.9% ('sigma'=12.25 µm) in comparison with the action of a diffractive axicon. It was also shown in the paper that when the reverse ring grating is illuminated by the Laguerre-superGauss (1,0) mode with circular polarization, the formation of a narrow and extended region of reduced intensity on the optical axis (optical trap) is observed.","PeriodicalId":46692,"journal":{"name":"Computer Optics","volume":"29 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83882962","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: 8