Computer Optics

431-438

Authors: D.A. Kozlov, E.S. Kozlova, V.V Kotlyar

In this paper a research on conditions for resonance excitation in a homogeneous dielectric cylinder with square cross-section is conducted using a FDTD-method. It is shown that in a cylinder with square cross-section resonant modes similar to whispering gallery modes can be excited, which allows one to reduce the transverse dimensions of the focal spot. FDTD method demonstrates an acceptable accuracy of the resonant mode detection. A similar result is obtained for a cube on a dielectric substrate: it is possible to achieve the reduction of the transverse dimensions of the focal spot by changing the corresponding cube size.

451-457

Authors: V.V. Kotlyar, A.G. Nalimov, M.V. Kotlyar

We propose a new version of the metalens, namely, a polarization microlens (PML) that focuses the linearly polarized laser light in a subwavelength circular spot. The PML consists of a set of binary subwavelength gratings, which are laid out in a parquet manner within the rings of a Fresnel zone plate. A phase shift of π, which the zone plate should introduce into the light field in passing the zone boundary, is implemented in the PML under study using two diffraction gratings adjacent to the zone boundary, which form oppositely polarized transmitted beams. It is shown that the PML relief depth can be reduced using a high refractive index material. For amorphous silicon, the PML relief depth can vary from 50 nm to 120 nm. In this case, a circular focal spot having a diameter smaller than the diffraction limit is formed at distances to the PML ranging from 200 nm to 1300 nm. The minimum focal spot diameter is 0.372 of a wavelength.

467-474

Authors: K.V. Andreeva, M.A. Moiseev, S.V. Kravchenko, L.L. Doskolovich

A novel method for the design of total internal reflection based (TIR) optical elements generating complex two-dimensional narrow-angle light distributions is presented. The method consists of two parts: computation of a piecewise smooth solution and its subsequent approximation by a spline surface. Examples of TIR optical elements designed using the proposed approach are discussed. The simulation results demonstrate high performance of the proposed method: the luminous efficacy of the optical elements is 91.8% and the relative root-mean-square error is less than 8.6%.

482-488

Authors: V.P. Korolkov, A.S. Konchenko, V.V. Cherkashin, N.G. Mironnikov

A process of manufacturing conformal correctors for solid state YAG:Nd3+ lasers is discussed. It is proposed that a maskless lithography method should be used for fabricating a photoresist film with a desired thickness profile as an alternative to the proximity lithography based on half-tone masks. The use of a specular spectral scatterometry method for the testing of the conformal corrector shape at an early stage of photoresist profile formation is reported. A combination of these two methods makes the corrector manufacturing process significantly cheaper and faster.

501-507

Authors: S. A. Shoydin

For the case of 3D phase holograms, the impact of the form factor on the hologram diffraction efficiency is shown. The form factor concept is introduced by analogy with the classical definition, which is used for calculating the averaged interaction of complex-shaped objects. In the present context, the form factor concept is used for determining the average diffraction efficiency of the holograms formed with the help of beams distributed non-uniformly over the hologram field. It is shown that after calculating the corrections, they can be used in the same way as coefficients in the classical formulas of the diffraction efficiency. The impact of such a form factor only comes into play when there are two factor present at the same time, i. e. non-linearity of photoresponse and non-uniformity of the light beam distribution over the hologram field.

516-525

Authors: N.A. Lomov, L.M. Mestetskiy

A "width of a shape" concept considered in relation to variable-width objects is used as the integral shape descriptor for image recognition tasks. The approach to the definition of this concept is based on covering the figure of interest with certain-size disks. A function that defines the area of disk cover against the disk size is used as a shape descriptor. An analytical method for calculating the area of disk cover for polygonal figures is proposed. The possibility to approximate by polygonal figures binary raster images and objects with non-linear boundaries makes the approach universal. The proposed method is based on the medial representation of objects as a skeleton and a radial function. The method provides high accuracy and computational efficiency. The efficiency of the proposed shape descriptor is illustrated by the example of its application to the digital font recognition problem.

535-542

Authors: A.Y. Denisova, V.V. Sergeye

In the article we offer a novel approach to calculating multichannel image histograms using hierarchical data structures. The proposed methods result in a histogram-tree which has many advantages over existing data structures traditionally used for multidimensional histograms. The suggested data structure requires a significantly smaller memory space for storage in comparison with a histogram that is presented as a frequency table for all possible brightness values (histogramhypercube). The histogram-tree provides a dramatic decrease in speed in comparison with the list of unique brightness values and their frequencies (histogram-list). Moreover, the histogram-tree allows one to approximate the probabilities of brightness values which are not presented in the analyzed image in contrast with the histogram-list. The possibility of histogram approximation is very important for practical applications. Such approximation for histogram-tree is constructed by means of tree reduction. Nodes with frequencies lower than a given threshold are removed from the histogram-tree. The reduced histogramtree benefits from the decrease of the required memory space while maintaining the accuracy of the original probability density distribution representation. We propose two algorithms for constructing a histogram-tree. The “depth” algorithm operates with image pixels sequentially. For each pixel it constructs appropriate branches and nodes until the maximum depth of the tree is achieved. This algorithm has a recursive realization and is more time efficient than the other one. The “across” algorithm performs a multiple scan of the image, each time filling just one tree level. This algorithm allows tne to operate with images with a larger number of channels than the “depth” algorithm because it is more memory efficient in the runtime when approximating a histogram. Both algorithms build the histogram-tree significantly faster when compared with the construction of the histogram-list. The theoretical estimates and experimental results described in the article demonstrate that computing histogram of multichannel images using histogram-tree has many advantages over the histogram-hypercube and histogram-list.

552-559

Authors: S.A. Borminsky, A.V. Solntseva, B.V. Skvortsov

The article describes a method for optoelectronic control of liquid volume in a tank. Measurements can be performed remotely without tank calibration. The method is based on the fact that there is a near-wall region where the liquid surface has a higher reflectivity. This region occurs due to surface tension or minor ripples. With this method, first, an image of liquid surface is taken with a photo-camera. Then, a near-wall liquid-air boundary is identified in the image before calculating the current area of the liquid surface. When the tank is filled for the first time, the device records the liquid area for every level. A calibration table is automatically created without applying additional tools. To avoid the error caused by inaccurate photo-camera positioning, a special mathematical model is devised. It uses reference marks made on tank walls horizontally. An algorithm for recognition of liquid boundaries in the image is developed. Measurements of the liquid volume conducted using a laboratory prototype have shown the reduced error to be within 0.5%, provided that the digital photo-camera is not rigidly fixed.

572-582

Authors: D.V. Mikhaylov, A.P. Kozlov, G.M. Emelyanov

In this paper we look at two interrelated problems of extracting knowledge units from a set of subject-oriented texts (the so-called corpus) and selecting texts to the corpus by analyzing the relevance to the initial phrase. The main practical goal here is finding the most rational variant to express the knowledge fragment in a given natural language for further reflection in the thesaurus and ontology of a subject area. The problems are of importance when constructing systems for processing, analysis, estimation and understanding of information. In this paper the text relevance to the initial phrase in terms of the described fragment of actual knowledge (including forms of its expression in a given natural language) is defined by the total numerical estimate of the coupling strength of words from the initial phrase jointly occurring in phrases of the text under analysis. The paper considers known variants of such estimation procedures and their application for the search of distinct components which reflect the initial phrase in the texts selected to the topical text corpus. These components correspond to words and their combinations. In comparison with the search of such components on a syntactically marked text corpus, the method for text selection offered in this paper enables a 15-times reduction (on average) in the output of phrases which are irrelevant to the initial one in terms of either the described knowledge fragment or its expression forms in a given natural language.

588-593

Authors: S.A. Degtyarev

In this work, using a finite element method implemented we simulate in the Comsol software focusing a TE-polarized Gaussian beam by 3D dielectric conical microaxicon tapers with smaller-than-30-degrees vertex angles. The simulation results have shown that, as is the case with the 2D axicons, with minor changes in a vertex angle, the 3D axicon can alternatively show either focusing or defocusing properties. However, the angle intervals in which the 2D and 3D axicons show focusing or defocusing properties are different.

305-311

Authors: A.A. Kovalev, V.V. Kotlyar, A.P. Porfirev

Transfer of the orbital angular momentum to dielectric microparticles optically trapped using recently discovered asymmetric Laguerre-Gaussian (LG) laser beams is demonstrated. We experimentally show that at a fixed topological charge, increasing beam asymmetry parameter leads to increasing velocity of the polystyrene beads moving along a crescent-shaped path.

322-330

Authors: V.V. Ivakhnik, M.V. Savelyev

Spatial characteristics of the degenerate four-wave radiation converter in a liquid containing nanoparticles were studied using a scheme with concurrent pump waves. The phase matching condition was shown to determine the general form of the spatial spectrum amplitude of the object wave, with the electrostriction phenomenon and Dufour effect shown to cause the emergence of dips in the spatial spectrum amplitude, with the dip positions corresponding to the propagation directions of the pump waves. The relationship between characteristics of the dips and the pump wave parameters were obtained.

338-345

Authors: L.L. Doskolovich, E.S. Andreev, M.A. Moiseev

A new optical surface reconstruction technique in the source-target mapping method is proposed. The technique is based on the representation of the surface as an envelope of a parametric family of paraboloids (ellipsoids). Using such a representation, the calculation of the optical surface is reduced to solving a complete differential equation without regard for the coordinate system. By way of illustration, mirrors that generate uniform intensity distributions in a square region are designed. Simulation of the design examples shows high performance of the proposed technique: it allows us to obtain good-quality intensity distributions even with violation of the integrability condition.

353-359

Authors: S.P. Murzin

We proposed a method of the formation of structures in materials by laser treatment aimed to enhance the performance characteristics of aircraft engine parts. The experimental study was conducted using a high-power gas CO2 laser ROFIN DC 010. Using an optical system comprising a focusing diffractive optical element, the laser beam was focused into a focal line with the maximum power density in its center. Tests on the joint deformation of the coating and substrate were conducted. We also determined the running-in ability of the ANB + NA-67 coating following the cut-in of an opposite element. It was found that the laser treatment of the sublayer enabled the bending angle to be increased while avoiding cracking and delamination of the coating.

370-379

Authors: O.V. Phylonin

We describe methods, algorithms and means of narrow-angle spectral and tomography diagnostics of parameters of plasma flows such as spatial local temperature distribution and concentration for small-size plasma ejectors (engines for orientation in space and thrusters).

388-394

Authors: S.M. Borzov, A.V. Golitsyn, O.I. Potaturkin

Methods for generating a synthesized image with increased depth of field from a sequence of real-time frames received by varying-range focusing using liquid optics are investigated. An algorithm based on constructing a map of ranges by analyzing a contrast pyramid and the weighed pixel-by-pixel summation of the initial images whose coefficients are proportional to the number of same-range pixels in each local neighborhood is developed.

404-409

Authors: R.G. Khafizov, S.A. Okhotnikov, T.V. Yaranceva

Mathematical models of contours of simple- and arbitrary-shape object images affected by geometrical distortions are proposed. It is shown that the contour spectrum is supplemented with additional harmonics depending on the type of the geometrical distortion. Models of contours with a combination of different geometrical distortions are discussed.

416-421

Authors: V. V. Sergeev, R. R. Yuzkiv

A new parametric model for the autocorrelation function of space hyperspectral data has been proposed. A heuristic algorithm for estimating the model parameters has been developed. The proposed model has been demonstrated to provide a good approximation of the observed autocorrelation functions.

135-140

Authors: A.G. Nalimov, V.V. Kotlyar

It is shown numerically that using planar gradient microlenses, the coherent radiation can be focused in a narrow line of width λ/38 and length λ/5.5. The efficiency of focusing is 22%. A slitted photonic-crystal lens retains the properties of sharp focusing of light characteristic of a gradient lens. Substitution of the gradient lens by a photonic-crystal analogue synthesized in a silicon was found not to degrade the characteristics of the lens substantially. In this case, we observed a reduction of side lobes near the focal spot and a 30.2% increase of the focusing efficiency.

147-151

Authors: V.G.Volostnikov

An asymptotic behavior of orbital angular momentum (OAM) for the light field as superposition of Hermite-Gaussian modes is considered. An analytical formula for the OAM of such fields is obtained. For a three- and four mode superposition it was found that their OAM can be larger than the maximum index in the superposition while the structural stability of the light field is retained.

158-163

Authors: E.N. Vorontsov, N.N. Losevsky, D.V. Prokopova, E.V. Razueva, S.A Samagin

On the basis of optical properties of spiral beams, various light fields whose intensity pattern rotates during the field propagation have been investigated. A dependence between the parameters of the illuminating beam and the quality of the generated light fields is discussed. The light fields have been formed using a liquid-crystal spatial phase modulator HOLOEYE HEO-1080P. The results of the experiments are in good agreement with numerical simulations.

173-178

Authors: S.V. Karpeev, A.V. Ustinov, S.N. Khonina

We study the possibility of creating a purely diffractive focusing doublet consisting of two components that are spaced apart. This doublet is able to focus light from three monochromatic sources with different wavelengths into the same focal spot. We analyze the characteristics of the designed doublet. Polychromatic focal distributions generated by the developed system are numerically calculated.

188-193

Authors: G.I. Greisukh, E.G. Ezhov, S.V. Kazin, S.A. Stepanov

Ways and methods of modeling and calculating a holographic combiner for a virtual display are presented. On the one hand, they allow Denisyuk holograms with high diffraction efficiency independent of the field angle to be generated. On the other hand, they allow the advantages of the holographic combiner when compared with a multilayer dielectric mirror to be maximally realized. Optimization and search of the design parameters of elements of an optical setup for generating an aspherical wavefront for recording a Denisyuk hologram are based on ray tracing. These processes are greatly facilitated by the use of an intermediate model in the form of a thin transparency for phase delay. The phase delay of this transparency, the mirror geometry of the optical setup that forms the aspherical wavefront for recording the hologram, and the actual model of Denisyuk hologram in this article are described in the form adopted in the Zemax environment for surfaces such as Binary1, Extended polynomial and Optically Fabricated Hologram.

203-214

Authors: N.L. Kazanskiy, I.S. Stepanenko, A.I. Khaimovich, S.V. Kravchenko, E.V. Byzov, M.A. Moiseev

A technique for controlling and optimizing injection molding parameters by numerical simulation is proposed. Using this method for an optical element designed for roadway lighting, multilens molding quality criteria have been defined. Optimal parameters for lens manufacturing have been determined. Based on these parameters, a polycarbonate multilens has been made with an absolute tolerance equal to 0.01 mm.

225-231

Authors: M.V. Gashnikov

Parameterization of the nonlinear Greham predictor is performed for a digital image compression method based on the differential pulse code modulation. The predictor automatically selects different methods for calculating each pixel in the image based on the availability and intensity of that pixel contour. A fast learning procedure that optimizes the prediction parameters is performed before the actual compression. In the course of optimization, the minimum sum of absolute values of prediction errors is provided. For this purpose, a recursive procedure is used, whose computational complexity is independent of the image size. The estimation of the computational complexity of the proposed predictor is conducted. To study the predictors computational experiments are carried out on real images. A gain the proposed predictor offers in terms of the root mean square error when compared with the prototypes is demonstrated. In addition, a gain that the compression method based on the differential pulse code modulation with the proposed predictor has over the JPEG compression method in terms of the maximum error is demonstrated.

240-248

Authors: I.A. Bratchenko, M.V. Alonova, O.O. Myakinin, A.A. Moryatov, S.V. Kozlov, V.P. Zakharov

The paper presents the analysis of hyperspectral images for human skin cancer diagnosis. The hyperspectral imaging data contained backscattered spectra of normal skin and malignant skin tumors. The analysis of hyperspectral images provided the information about the shape and intensity of hemoglobin and melanin spectral lines for the differentiation of malignant pigmented skin neoplasms.

258-265

Authors: A.I. Efimov, A.I. Novikov

We propose a multistage algorithm for constructing a projective transformation based on arbitrary sets of keypoint pairs, with the sets containing more than four keypoint pairs. In the course of calculation of a homography matrix, unsuccessful keypoint pairs are detected and rejected. Experimental results on image superimposition using projective transformations for homogeneous and heterogeneous images are presented. Methods for assessing the quality of image superimposition, which include the local and integral estimates of the superimposition quality, are proposed.

275-283

Authors: A.A. Agafonov, V.V. Myasnikov

A reliable shortest path problem in time-dependent stochastic networks is considered in this paper. We develop and research a method for reliable routing that uses actual and forecast information of traffic flow parameters. We compare the performance of the proposed algorithm with that of a well-known algorithm on a real traffic network in the city of Samara, Russia. On the basis of computing experiments it is shown that while being a bit more computationally challenging, the proposed method increases the possibility of successfully solving the shortest path problem in a time-dependent stochastic network.

294-300

Authors: V.I. Shakhuro, A.S. Konushin

A new public dataset of traffic sign images is presented. The dataset is intended for training and testing the algorithms of traffic sign recognition. We describe the dataset structure and guidelines for working with the dataset, comparing it with the previously published traffic sign datasets. The evaluation of modern detection and classification algorithms conducted using the proposed dataset has shown that existing methods of recognition of a wide class of traffic signs do not achieve the accuracy and completeness required for a number of applications.

5-11

Authors: A.A. Kovalev, V.V. Kotlyar, S.G. Zaskanov, D.S. Kalinkina

We studied a generalization of the family of Laguerre-Gaussian (LG) laser modes with asymmetrical intensity distribution. As the asymmetrical LG beam is propagating in a homogeneous medium, the asymmetry of its main (central) bright ring reduces, while the contrast of the rest rings increases. The number of bright rings coincides with that of a standard (symmetrical) LG mode. Using the expansion of the complex amplitude into the angular spectrum of plane waves, we calculated analytically the power of the asymmetrical LG beams and projection of their orbital angular momentum (OAM) on the optical axis. It is found that the normalized OAM (OAM per photon) is completely determined by the topological charge and the ratios between the shifts and the waist radius. We also found the conditions under which the normalized OAM coincides with the topological charge (as is the case for the optical vortices).

19-25

Authors: V.V. Ivakhnik, M.V. Savelyev

The spatial selectivity of the degenerate four-wave radiation converter in a transparent twocomponent medium based on the electrostriction and Dufour effect has been analyzed as a function of the rotation and divergence of pump waves. Expressions connecting most efficiently the converted spatial frequency bandwidth with the rotation angle and divergence of pump waves has been obtained.

31-35

Authors: D.A. Anchikov, A.A. Krents, N.E. Molevich, A.V. Pakhomov

In this paper we investigated the spatio-temporal instabilities of stationary lasing in broadarea class-B lasers. Conditions for the onset of filamentary instability and its spatio-temporal characteristics were obtained analytically. The lasing stabilization capabilities through varying laser parameters were considered. We have also shown that effective suppression of unstable field components may be achieved by external optical injection into the cavity.

45-50

Authors: A.V.Gornostay, S.B. Odinokov

We discuss the computation of parameters of a diffractive beam splitter that uses a diffractive optical element synthesized in a bichromated gelatine to split a white incident laser beam into three different-wavelength beams.

57-63

Authors: V.S. Nikitin, E.I. Semyonov, A.V. Solostin, V.G. Sharov, S.V. Chayka

We conducted a theoretical study of the development of optical signal dividers for twodimensional arrays of VCSEL-lasers and PIN photodiodes used in transceivers of full duplex ‘Smartlink connections’ with the constituent components fabricated by 3D printing. A multichannel optical signal divider for full duplex ‘Smartlink connections’ that can be fabricated using 3D printing technologies, such as SLA (Stereolithography) and FDM (Fused Deposition Modeling), was designed.

73-79

Authors: A.Yu. Rubis, M.A. Lebedev, Yu.V. Vizilter, O.V. Vygolov

In this paper a technique of morphological comparative filtering based on image guided contrasting is proposed. Also, a technique of image background normalization based on guided contrasting via an image pyramid and the corresponding сhange detection algorithm is presented. The approach is tested on a public change detection benchmark dataset.

87-98

Authors: V.A. Fedoseev

The paper presents a new model for a unified description of information hiding systems including both steganographic and watermarking systems. The model is based on considering three possible representations of the information being embedded: a binary vector, a digital signal, and a feature matrix. Some examples of the model usage are discussed.

112-120

Authors: V.G. Chafonova, I.V. Gazeeva, G.V. Tihomirova

In this article, we propose a method for automatically controlling and correcting the scale and rotation mismatch of stereo pairs using digital image processing. The algorithm of this method is implemented using Matlab. The control of the mentioned parameters is based on the use of special feature detectors, statistical analysis methods and trigonometric relations. The correction is performed with the use of affine transformations.

5-13

Authors: Ustinov A.V., Khonina S.N.

In previous studies we have shown on the basis of the geometrical-optical analysis that the fracxicon (generalized optical element of the parabolic lens and the linear axicon) formally produces an infinitely large value of the intensity on the optical axis. Within the framework of the paraxial wave model this caustic effect was not found. In this paper, we consider plane wave diffraction on the fracxicon in nonparaxial wave model and we show that at high numerical aperture the fracxicon with an exponent close to 3/2, is actually an analogue of the hyperbolic lens optimally focusing incident beam.

21-29

Authors: Sotsky A.B., Belskaya O.A., Sotskaya L.I.

A method based on the Green’s theorem and the Graph’s addition theorem is used to construct a solution of 2D problem on lateral diffraction of a light beam on a microstructured fiber formed with a finite number system of parallel cylinders enclosed in a restricted shell. It is shown that the solution can be used for computing the angular distribution of the far field intensity in the case of three-dimensional beam diffraction on a microstructured fiber. Diffraction fields appeared at illumination of microstructured fibers by TE and TM polarized Gaussian beams are analyzed.

36-41

Authors: Volostnikov V.G., Kishkin S.A., Kotova S.P.

The paper brings forward a theoretical study of the usability of the mathematical apparatus of spiral beams for problems of the contour images identification. The estimation of the approach offered is given in the light of its advantages and shortcomings, numerical simulation results are offered and the method applications aspects are analyzed in the context of actual practical tasks.

47-51

Authors: Masalsky N.V.

Perspective approach of simulation of the silicon nanophotonic modulator characteristics executed on the basis of silicon-on-insulator standard technical process is discussed. Optical characteristics of the waveguide structure are changed by means of effect of free carrier dispersion. On the basis of numerical calculations the device topological parameters are optimized for achievement of high modulation characteristics.

60-69

Authors: Mokeyev V.V. , Tomilov S.V.

Some aspects of image analysis based on PCA (Principal Component Analysis) and LDA (Linear Discriminant Analysis) are considered in the paper on the solution of the image recognition. The main idea of this approach is that, firstly, we project the face image from the original vector space to a face subspace via PCA; secondly, we use LDA to obtain a linear classifier. Efficiency of application of PCA and LDA to a problem of recognition of face images without their preliminary normalization is investigated in the paper. When the number of images per class is not large, it is proposed to supplement the training set by the images obtained by rotating, scaling and mirroring. On images of the ORL and Feret databases influence expansion of the training set on performance of unnormalized face images recognition is studied. Also a problem of increasing the high performance of principal component calculation for large image samples is considered. A linear condensation method is used as a new technique to calculate the principal components of a large matrix. The accuracy and high performance of the developed algorithm is evaluated.

76-80

Authors: Nemirovskiy V. B., Stoyanov A. K.

In this paper the usage of multi-step segmentation for near-duplicate image recognition is investigated. The clustering of image pixels brightness is used for segmentation. The clustering is implemented by means of a recurrent neural network. The search pattern based on the rank distributions of the brightness clusters cardinality is suggested. Experimental results on the near-duplicate image recognition based on the application of the suggested search pattern are given. It is shown that the use of multi-step segmentation and rank distributions of the brightness clusters cardinality allows successfully recognize the duplicates obtained by the considerable visual distortion of the original image or by scale change of image.

88-98

Authors: Sklyarenko M.S.

Nowadays computer vision methods, in particular object tracking, are widely used by scientists and engineers. Primarily, object tracking is used in such applications as CCTV, crash tests, sports broadcasts and etc. Many methods can be adapted for non-contact optical measurements of coordinates and velocities of mechanical systems in physical experiments. Camera parameters influence on optical measurement accuracy is analyzed. We present comparative review of tracking algorithms and show how they can be used in mechanical experiments and analyze their accuracy in real mechanical experiments. Also we show our earlier developed methods adopted for the laboratory experiments which have subpixel accuracy and are robust to lightning differences. We present short review of tracking software. It is shown that object tracking techniques can be used for non-contact measurements and analysis of mechanical systems.

106-112

Authors: Vaniev A.A.

Article is devoted to the development of methods and criteria for identification of multiple moving objects observed by passive optical digital locator. Approaches to the development of methods of identification of multiple moving objects are examined. Mathematical model of the promising measuring system and some results of practical research are provided. The developed model can be used in various measurement and control systems, real-time observation for the separate estimation of motion of objects in the group.

119-125

Authors: Sadykov S.S., Bulanova Yu.A., Zakharova E.A.

This paper proposes a technology of computer diagnosis of tumors in mammary gland of three main types: cyst, fibroadenoma, and breast cancer. It is noted that the use of such technology in the health care setting reduces the chance of missing a tumor when viewing mammograms, at an early stage of development, and also minimizes the subjectivity of diagnosis. Work on a set of technologies studied real mammograms from MIAS database with known diagnoses. The results of experiments show the possibility of using the developed integrated cabinet in mammography based on this technology as well for general research as for screening.

132-155

Authors: Ilyasova N.Yu.

A review of key approaches to the digital analysis of the human vascular system images is given in the paper. We outline major stages of diagnostic image processing and analyze different approaches to the extraction and quantification of blood vessel morphological features.

164-168

Authors: Anshakov G.P., Raschupkin A.V., Zhuravel Y.N.

RESURS-P spacecraft enables to observe underlying surface using both multi– and hyperspectral equipment at the same time. The multispectral images received have high spatial but low spectral resolution. Hyperspectral images, on the contrary, have high spectral but low spatial resolution. This article is devoted to the hyper– and multispectral data fusion method of information properties improvement.