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arXiv 2021年

作者： Frolkovič, Peter Krišková, Svetlana Rohová, Michaela Žeravý, Michal Dept. of Mathematics and Descriptive Geometry Faculty of Engineering STU Radlinského 11 Bratislava810 05 Slovakia

We present a parametric family of semi-implicit second order accurate numerical methods for non-conservative and conservative advection equation for which the numerical solutions can be obtained in a fixed number of forward and backward alternating substitutions. The methods use a novel combination of implicit and explicit time discretizations for one-dimensional case and the Strang splitting method in several dimensional case. The methods are described for advection equations with a continuous variable velocity that can change its sign inside of computational domain. The methods are unconditionally stable in the non-conservative case for variable velocity and for variable numerical parameter. Several numerical experiments confirm the advantages of presented methods including an involvement of differential programming to find optimized values of the variable numerical parameter. © 2021, CC BY.

关键词： Numerical methods

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Respiratory rate estimation using nostril detection in thermal video streams 6

Respiratory rate estimation using nostril detection in therm...

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6th IEEE International Conference on E-Health and Bioengineering, EHB 2017

作者： Mocanu, Bogdan Ţarǎlungǎ, Dragos Ţapu, Ruxandra Ţapu, Ermina Faculty of ETTI University Politehnica of Bucharest Bucharest Romania Dept. of Descriptive Geometry and Engineering Graphics Faculty of Aerospace Engineering University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9781538603581

In this paper we propose a complete method for breath rate estimation using thermal video streams and computer vision algorithms. The system performs subject nose detection, interest point extraction and tracking, geometric transformation and minimum thermal region estimation. All algorithms are carefully designed in order to ensure real-time capability on a regular desktop computer. The experimental evaluation validates the proposed methodology, when compared with traditional breath rate extraction methods, returning high accuracy scores. © 2017 IEEE.

关键词： Extraction

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Respiratory rate estimation using nostril detection in thermal video streams

Respiratory rate estimation using nostril detection in therm...

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E-Health and Bioengineering Conference (EHB)

作者： Bogdan Mocanu Dragoş Ţarălungă Ruxandra Ţapu Ermina Ţapu Faculty of ETTI University “Politehnica” of Bucharest Bucharest Romania Dept. of Descriptive Geometry and Engineering Graphics University “Politehnica” of Bucharest Romania

关键词： Nose Estimation Streaming media Algorithm design and analysis Face Feature extraction Real-time systems

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Video retrieval using relevant topics extraction from movie subtitles

Video retrieval using relevant topics extraction from movie ...

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International Symposium on Electronics and Telecommunications (ISETC)

作者： Bogdan Mocanu Ruxandra Tapu Ermina Tapu Dep.of Telecommunications University “Politehnica” of Bucharest Bucharest Romania Dept. of Descriptive Geometry and Engineering Graphics University “Politehnica” of Bucharest Romania

ISBN: (纸本)9781509037490

In this paper we propose a novel video retrieval approach based on relevant topics extraction from video subtitles using natural language processing strategies and movie temporal segmentation into scenes. The proposed method is able to identify various subjects existent in a subtitle document and deals with the polysemantic character of words. The approach has been tested on various movie genres, including documentaries, TV series, news, sports. The objective evaluation carried out on a video dataset selected from one week video archive of France Television proves the performance of our technique that returns a mean average precision score superior to 0.5.

关键词： Streaming media Motion pictures Context Semantics TV Reliability Visualization

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A survey on wearable devices used to assist the visual impaired user navigation in outdoor environments

A survey on wearable devices used to assist the visual impai...

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International Symposium on Electronics and Telecommunications (ISETC)

作者： Ruxandra Tapu Bogdan Mocanu Ermina Tapu Department of Telecommunications University “Politehnica” of Bucharest Bucharest Romania Dept. of Descriptive Geometry and Engineering University “Politehnica” of Bucharest Romania

In this paper we introduce a comprehensive survey of wearable systems designed to assist the visual impaired users navigation in everyday life outdoor scenarios. We focus on presenting the main advantages and limitations of each technique in effort to inform the scientific community about the progress in the area of assistive devices and also offer users a review about the capabilities of each system. Various performance parameters are introduced in order to classify different systems by giving qualitative and quantitative measures for evaluation. At the end of the study conclusions are presented along with some perspectives for future work and development.

关键词： Navigation Prototypes Visualization Cameras Educational institutions Machine vision Vibrations

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Automatic extraction of salient objects in 3D stereoscopic videos

Automatic extraction of salient objects in 3D stereoscopic v...

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International Symposium on Electronics and Telecommunications (ISETC)

For 3D stereoscopic videos the dept. perception represents an important factor that affects the human visual attention much more than any motion or texture contrast existent in a traditional 2D videos. In this context, the present paper addressed the issue of stereoscopic visual attention models designed to detect salient objects in 3D videos. We propose representing the image sequence as a 2D video stream and its associated dept. maps. The technique starts by combining a spatiotemporal attention model with a disparity map. The dept. map offers important information about the objects position in space and helps us estimating their relative distance to the video camera. The proposed method is evaluated on a set of ten 3D video streams and can be considered efficient and robust.

关键词： Videos Visualization Three-dimensional displays Spatiotemporal phenomena Stereo image processing Streaming media Cameras

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Mesh deformation with hard constraints

Mesh deformation with hard constraints

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International Symposium on Signals, Circuits and Systems (ISSCS)

作者： Bogdan Mocanu Ruxandra Tapu Ermina Tapu Dept. of Telecommunications Telecommunications and Information Technology Bucharest Romania Dept. of Descriptive Geometry and Engineering Graphics Faculty of Aerospace Engineering Bucharest Romania

In this paper we tackle the issue of 3D mesh deformation when hard constraints of warping are imposed by user or application. First, we propose a review of the most salient methods existent in the technical literature. Then we retain for a more detailed analysis only some variants of Laplacian coordinates and Radial Basis Functions techniques that allow fine local movements of vertices and respect a set of constraints. We evaluate the selected techniques in terms of quality deformation, computational efficiency and displacement accuracy. The best results are obtained for the CTPS C 2 a continuous radial basis function closely followed by CP C 2 function.

关键词： Laplace equations Three-dimensional displays Accuracy Shape Equations geometry Solid modeling

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Automatic scene/DVD chapter extraction in Hollywoodian movies

Automatic scene/DVD chapter extraction in Hollywoodian movie...

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International Symposium on Signals, Circuits and Systems (ISSCS)

作者： Ruxandra Tapu Bogdan Mocanu Ermina Tapu Dept. of Telecommunications Faculty of Electronics Telecommunications and Information Technology Bucharest Romania Dept. of Descriptive Geometry and Engineering Graphics Faculty of Aerospace Engineering Bucharest Romania

In this paper we tackle the issue of video scene/DVD chapter segmentation. First, we introduce a review and analysis of the most salient methods existent in the technical literature. Then we propose a novel methodological framework for high level video temporal structuring and segmentation that extracts scenes/DVD chapters based on temporal constraints clustering, adaptive temporal lengths, neutralized shots and adaptive thresholding mechanism. The output of our method provides a structured video and facilitates the user access to different parts of the image sequence. In order to validate the proposed technique we have considered as low level visual features the interest points extracted using the SURF descriptor. The experimental evaluation validates the proposed approach returning an average score for the F1 norm of 82%.

关键词： DVD Visualization Motion pictures Semantics Motion segmentation Streaming media Feature extraction

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Salient object detection in video streams

Salient object detection in video streams

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International Symposium on Electronics and Telecommunications (ISETC)

In this paper we propose a complete framework for automatic detection and tracking of salient objects in video streams. The video flow is firstly segmented into shots based on scale space filtering graph partition method. For each detected shot the associated static summary is developed using a leap keyframe extraction method. Based on the representative images we introduce next a combined spatial and temporal video attention model that is able to recognize both interesting objects and actions in image sequences. The approach extends the state-of-the-art image region based contrast saliency with a temporal attention model. Different types of motion presented in the current shot are determined using a set of homographic transforms, estimated by recursively applying the RANSAC algorithm on the interest point correspondence. Finally, a decision is taken based on the combined information from both saliency maps. The experimental results validate the proposed framework and demonstrate that our approach is suitable for various types of videos and is robust to noise and low resolution.

关键词： Visualization Humans Computational modeling Streaming media Spatiotemporal phenomena Cameras Transforms

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Introduction

Lecture Notes in Geoinformation and Cartography

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Lecture Notes in Geoinformation and Cartography 2010年 xvii-xxii页

作者： Konecny, Milan Zlatanova, Sisi Bandrova, Temenoujka L. Masaryk University Dept. Geography Kotlarska 2 Brno611 37 Czech Republic Delft University of Technology OTB GIS Technology Jaffalaan 9 Delft2628 BX Netherlands University of Architecture Civil Engineering & Geodesy Dept. Descriptive Geometry Hristo Smirnenski Blvd. 1 Sofia1046 Bulgaria

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