Automating Placement of Point Feature Labels on a Digital Map using Non-linear Mathematical Programming
M. Y. Zarubin, I. G. Pristupa, S. V. Ktirov
Accepted: 2022-05-03
Abstract
A paper is considered one of the approaches to solving the problem of automating placement of point feature labels on a digital map. The causes of label overlaps are analyzed, and requirements for label placement are formulated. Two different statements of optimization problems are proposed for finding the optimal locations of labels of point feature labels on a digital map. One of them is based on the idea that as the distance between labels increases, the chance of labels overlay decreases, and as a result, it becomes possible to identify each point feature on a digital map and read information about it presented on the label. In another statement, it is proposed to minimize the distances from objects to their labels in order to quickly and efficiently identify a particular object on the map. The article presents the results of solving optimization problems, which shows the fundamental possibility of obtaining optimal label locations and demonstrates the quality of label placement using the considered approaches.
Numerical Calculation and Visualization of Pseudosymmetry Attributes of Biological Objects
E.V. Popov, T.P. Popova, A.A. Nizhegorodtsev, D. Vershinina
Accepted: 2022-05-03
Abstract
The paper describes the approach and computer program to calculation and visualization of pseudosymmetry attributes of complexly structured objects of various nature. The approach is based on the group-theoretic and set-theoretic analysis. The program is aimed at the numerical estimation of bilateral pseudosymmetry of various nature objects both in 2D and in 3D case. In 2D case it calculates DoI (degree of invariance) of the object contour depending on the angle of its rotation relative to the axes of given coordinate system. The local maxima of DoI plot make it possible to determine the direction of bilateral pseudosymmetry axes of the object contour. In 3D case, the output data of DoI is a table of numerical values depending on zenith and azimuth angles of the spherical coordinate system. This table allows obtaining the set of pseudosymmetry planes of an object. There are some examples in the paper demonstrating the efficiency of the described approach and program.
Method for generating synthetic images of masked human faces
M.A. Letenkov, R.N. Iakovlev, M.V. Markitantov, D.A. Ryumin, A.I. Saveliev, A.A. Karpov
Accepted: 2022-03-25
Abstract
This study is devoted to the topical problem of generating synthetic images of human faces. The paper presents a new method for generating images of human faces in protective masks. The proposed method is based on the combined use of a neural network method for detecting three-dimensional facial landmarks (3D-FAN) and three-dimensional modeling tools. Approbation and quality assessment of the proposed method was conducted on a test dataset, which includes 3836 images. The dataset included human faces images of different gender and age, taken at different distances and at various angles relatively to the camera lens. To assess generation results, the method of multi-criteria assessment was used with the involvement of an expert group. For each generated image final scores were formed by averaging the obtained ratings, both by criteria and by experts. During the experiment, the developed method has demonstrated a high and stable quality for the following ranges of face orientations [-20; +55], [-60; +60] and [-70; +80] along the OX, OY and OZ axes, respectively. The final proportion of correctly generated images of masked human faces turned out to be 95.9%.
Visualization of lung sounds based on multilevel wavelet analysis
Y.G. Gorshkov
Accepted: 2022-03-25
Abstract
The article presents the results of research in the field of high-precision visualization of lung sounds based on the technology developed by the author for multilevel wavelet analysis of acoustic biomedical signals. A review of publications on the study of lung sounds in recent years has been made. Based on the analysis of records of domestic and foreign databases, parameters are given, on the basis of which respiratory sounds should be attributed to complex non-stationary signals. At the same time, in almost all used phonospirographic complexes and software tools for analyzing pulmonary sounds, spectral characteristics are calculated using the Fourier transform or FFT, which leads to errors in the diagnosing diseases.
The possibilities of the developed software tool for high-precision analysis of the sounds of lungs WaveView-MWA are considered. 40 records of two textbooks «Auscultation of the lungs» were processed using high-precision wavelet analysis algorithms. Examples of obtained acoustosonograms and frequency-time characteristics of pulmonary sounds in various diseases are presented. It is shown that acoustosonograms of multilevel wavelet analysis have an increased time-frequency resolution compared to Fourier spectrograms and provide visual high-precision visualization of lung sounds.
