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Tytuł:
Face Tracking and Recognition with the Use of Particle-Filtered Local Features
Autorzy:
Stasiak, Ł. A.
Pacut, A.
Powiązania:
https://bibliotekanauki.pl/articles/308537.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
biometrics
face recognition
particle filtering
video analysis
Opis:
A consistent particle filtering-based framework for the purpose of parallel face tracking and recognition from video sequences is proposed. A novel approach to defining randomized, particle filtering-driven local face features for the purpose of recognition is proposed. The potential of cumulating classification decisions based on the proposed feature set definition is evaluated. By applying cumulation mechanisms to the classification results determined from single frames and with the use of particle-filtered features, good recognition rates are obtained at the minimal computational cost. The proposed framework can operate in real-time on a typical modern PC. Additionally, the application of cumulation mechanisms makes the framework resistant to brief visual distortions, such as occlusions, head rotations or face expressions. A high performance is also obtained on low resolution images (video frames). Since the framework is based on the particle filtering principle, it is easily tunable to various application requirements (security level, hardware constraints).
Źródło:
Journal of Telecommunications and Information Technology; 2010, 4; 26-36
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Narratives in Illness: A Methodological Note
Autorzy:
Hydén, Lars-Christer
Powiązania:
https://bibliotekanauki.pl/articles/2138572.pdf
Data publikacji:
2008-12-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Narrative
Methodology
Identity
Performance
Ethnography
Video analysis
Opis:
As a result of the general growth in the interest in narratives different conception of what a story is and how to analyze has emerged. One especially interesting and methodological relevant difference is between the conception of narratives as textual objects and narratives as part of a storytelling event. The paper discusses the theoretical differences between these two analytical approaches to narratives. An example from my own research on Alzheimer’s patients telling stories illustrate the possibilities of using a performative and micro ethnographic approach to the study of storytelling in order to understand the functions of narratives – especially in relation to identity work. If stories not only are thought of as representations of events it becomes possible to view stories and story telling as social action: social states are both established, negotiated and changed through stories. This is especially important in the field of health and illness where diseases almost always are embedded in conversations and the telling of why and how symptoms were discovered or traumas received. For many patients and persons with especially communicative disabilities story telling is a challenge, but also an opportunity to actually master, maintain and often transform their identities.
Źródło:
Qualitative Sociology Review; 2008, 4, 3; 49-58
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral analysis by a video camera in a holographic optical tweezers setup
Autorzy:
Drobczynski, S
Dus-Szachniewicz, K
Symonowicz, K.
Glogocka, D
Powiązania:
https://bibliotekanauki.pl/articles/174701.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
holographic optical tweezers
power spectrum density
video analysis
Opis:
We discuss the basic parameters of the holographic tweezers equipped with a diode laser and cheap video camera. We compare these parameters with the system using a fast camera and high power Nd:YAG laser. The measured parameters are: the power spectra density calculated from tracing the position of the micron polystyrene beads and the trap stiffness. We show that this cheap optical tweezers system is sufficient for experiments in microbiology.
Źródło:
Optica Applicata; 2013, 43, 4; 739-746
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchronization of data recorded using acquisition stations with data from camera during the bubble departure
Autorzy:
Dzienis, P.
Mosdorf, R.
Powiązania:
https://bibliotekanauki.pl/articles/102394.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
experimental data synchronization
time series
video analysis
bubble departure
Opis:
In this study the first part of the experimental data was recorded in a data acquisition station, and another one was recorded with a high speed camera. The data recorded using the acquisition station was recorded with higher frequency than the time between two subsequent frames of the film. During the analysis of the experimental data the problem was related to the synchronization of measurement from acquisition station and data recorded with a camera. In this paper the method of synchronization of experimental data has been shown. A laser- phototransistor system has been used. The data synchronization was required in scaling of sampling frequency in the investigated time series.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 20; 29-34
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of traffic situations from digital video-recording using method of volumetric kinetic mapping
Autorzy:
Kolla, Eduard
Ondruš, Ján
Vertal', Peter
Powiązania:
https://bibliotekanauki.pl/articles/263457.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
traffic accidents
near-miss incidents
video analysis
accident reconstruction
PC-Crash
Opis:
In the past the traffic accident reconstruction was based in principle only on indirect methods that use accident marks and witness reports. These data were then used within backward reconstruction of event for determination of motion status of accident participants and expression of desirable quantities as are initial velocities, impact velocities, distances travelled or temporal conditions. These methods and their accuracy are dependent on the width of intervals of input quantities or on limited possibilities for motion synchronization between numerable participants of road traffic accidents. Existence of footage from CCTV cameras that captures traffic situations presents very valuable source of information about these accidents. The goal of the article is proposal of a volumetric kinetic mapping (VKM) method of accident reconstruction from CCTV footage. The method is based on synthesis of videoediting, videoanalysis and kinetic simulation using dedicated software for accident reconstruction. The method was furthermore validated for speed-time and distance-time variables by means of experimental test runs and by subsequent application of the method in the reconstruction of these tests using PC-Crash simulation software and two videoediting software packages. Results of the reconstructions of validation runs using VKM method were then verified by comparing them to the measured data from Corrsys Datron Microstar measuring system.
Źródło:
Archiwum Motoryzacji; 2019, 84, 2; 147-170
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The (Re)Construction of Human Conduct: “Vernacular Video Analysis”
Autorzy:
Tuma, René
Powiązania:
https://bibliotekanauki.pl/articles/2108248.pdf
Data publikacji:
2012-08-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Vernacular Video Analysis
Ethnomethodology
Interpretation
Interaction
Video
Workplace Studies
Visual Knowledge
Reflective Methods
Scientific Practice
Experts
Opis:
Video technology became available in the 1960s and massively diffused into nearly all institutional spheres during the following decades (Zielinski 1986). It is not only used for provision of movies and entertainment (Greenberg 2008), documenting, and recording of events in the semi-professional and private domain (Raab 2008), but also for the analysis of human conduct in psychology and education (Mittenecker 1987) and in sociology (Knoblauch et al. 2006; Knoblauch et al. 2008; Kissmann 2009; Heath, Hindmarsh and Luff 2010). In this paper, I am going to argue that with the availability of video technology a form of discursive practice of interpretive (re)construction of knowledge has been established in a variety of vernacular fields of practice. Based on the available literature and an empirical example taken from a public demonstration of such a vernacular video analysis, I will show some elements of communicative practice that allow for detailed analysis of visual knowledge. Furthermore, I will discuss methodological issues, as to be approached, and which elements can be found that constitute the communicative (re)constructive processes of analysis. 
Źródło:
Qualitative Sociology Review; 2012, 8, 2; 152-163
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Videography in Migration Research: A Practical Example for the Use of an Innovative Approach
Autorzy:
Rebstein, Bernd
Powiązania:
https://bibliotekanauki.pl/articles/2108250.pdf
Data publikacji:
2012-08-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Video-Analysis
Genre Analysis
Videography
Focused Ethnography
Migration
Integration
Cross-Cultural Expansion
Cross-Cultural Events
Opis:
This article is an example of the practical application of natural video recordings to qualitative research. It describes the videographic method in relation to an ongoing project concerned with forms of knowledge communication within the field of migration. In this field, our visual approach provides a novel perspective on the well-known questions of cross-cultural communication and integration. Firstly, I want to discuss Videography and Genre Analysis in the form of an iterative, audiovisual data collection procedure and define the process of sequence selection and interpretation. Secondly, I will demonstrate how communicative structures are analyzed at different levels of Genre Analysis through the minute analysis of a short audiovisual data sequence from a roadshow that took place during a Latin American theme week. As well as detailing the process of gathering information on a situational level, I want to demonstrate the potential of the analysis to gather information about the structural environment on a transsituational level. Through this discussion, I will also outline the importance of additional contextual information that – by means of further ethnographic research – could be uncovered in our fieldwork.
Źródło:
Qualitative Sociology Review; 2012, 8, 2; 130-151
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analyzing Emotional Styles in the Field of Christian Religion and the Relevance of New Types of Visualization
Autorzy:
Herbrik, Regine
Powiązania:
https://bibliotekanauki.pl/articles/2108254.pdf
Data publikacji:
2012-08-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Religion
Religiosity
Emotion
Emotional Culture
Video Analysis
Feeling Rules
Emotional Regime
New Religious Movements
Church Life
Opis:
In the following text the theoretical conception, the employed analysis methods and some first results of the research project “The Emotionalization of Religion” are presented. The aim of the project is to compare newer Christian congregations with a Pentecostal or evangelical orientation to Christian parishes affiliated with the Evangelical Church in Germany or the Roman Catholic Church with regard to their respective emotional culture. The employed method set includes several qualitative methods, such as videoanalysis, the analysis of guideline interviews and participant observation. A particular focus lies within the empirical paragraph on the question: What role do new types of media usage in Christian parishes play for the development, representation and analysis of new emotional styles?
Źródło:
Qualitative Sociology Review; 2012, 8, 2; 112-128
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatyczne rozpoznawanie treści nielegalnych filmów typu CSAM za pomocą klasyfikatora częściowo splatającego kolejne klatki materiału wideo
Autorzy:
Laskowska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/20311657.pdf
Data publikacji:
2023-10-31
Wydawca:
Akademia Sztuki Wojennej
Tematy:
cybersecurity
computer video analysis
machine learning
neural networks
deep neural networks
transfer learning
Child Sexual Abuse Material
CSAM
Opis:
The paper describes one of the methods of automatic recognition of CSAM materials, which was tested during the research under the APAKT project. The proposed solution is based on Temporal Shift Module (TSM), a model of a deep neural network created for efficient human activities rocognition in video. We applied transfer learning method for training the model with a relatively small number of training data to succesfully rocognize films with pornografic and illegal content. We conducted some tests of classification of films from three categories: neutral films, legal pornography and illegal pornografic videos (CSAM). In this paper we present problems that are connected with this research topic that come from the characteristic of the data. We also show that further works are needed to keep children safe in cyberspace.
Źródło:
Cybersecurity and Law; 2023, 10, 2; 195-201
2658-1493
Pojawia się w:
Cybersecurity and Law
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic estimation of the brightness changes for background suppression methods used for video tracking of vehicles
Autorzy:
Okarma, K.
Mazurek, P.
Powiązania:
https://bibliotekanauki.pl/articles/393475.pdf
Data publikacji:
2012
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
analiza obrazów
video śledzenie
automatyczna estymacja
image analysis
video tracking
automatic estimation
Opis:
One of the typical distortions in the background estimation methods is a change of lighting conditions, since each such change influences on the luminance of pixels in the captured images, which may be classified as the background. The global changes are relatively easy to compensate, but in practical applications the character of most of such changes is rather local. These changes may be caused e.g. by clouds, moving large objects, street lamps etc. Nevertheless, their influence on the results of the background estimation should be reduced therefore a local adaptive correction algorithm, applied as the pre-processing step, is proposed in the paper, assuming known geometrical configuration of the observed road
Źródło:
Archives of Transport System Telematics; 2012, 5, 4; 17-20
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Compressed Data Stream Content in HEVC Video Encoder
Autorzy:
Stankowski, J.
Karwowski, D.
Grajek, T.
Wegner, K.
Siast, J.
Klimaszewski, K.
Stankiewicz, O.
Domański, M.
Powiązania:
https://bibliotekanauki.pl/articles/227246.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HEVC
video compression
compressed data stream analysis
Opis:
In this paper, a detailed analysis of the content of the bitstream, produced by the HEVC video encoder is presented. With the use of the HM 10.0 reference software the following statistics were investigated: 1) the amount of data in the encoded stream related to individual frame types, 2) the relationship between the value of the QP and the size of the bitstream at the output of the encoder, 3) contribution of individual types of data to I and B frames. The above mentioned aspects have been thoroughly explored for a wide range of target bitrates. The obtained results became the basis for highlighting guidelines that allow for efficient bitrate control in the HEVC encoder.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 2; 121-127
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Audio-Video Analysis Method of Public Speaking Videos to Detect Deepfake Threat
Metoda analizy audio-wideo filmów z wystąpień publicznych w celu wykrycia zagrożenia typu deepfake
Autorzy:
Wolański, Robert
Jędrasiak, Karol
Powiązania:
https://bibliotekanauki.pl/articles/35064097.pdf
Data publikacji:
2023
Wydawca:
Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
Tematy:
analysis of audio-video stream
detection of deepfake threats
analysis
public speeches
analiza strumienia audio-wideo
wykrywanie zagrożeń typu deepfake
analiza
wystąpienie publiczne
Opis:
Aim: The purpose of the article is to present the hypothesis that the use of discrepancies in audiovisual materials can significantly increase the effectiveness of detecting various types of deepfake and related threats. In order to verify this hypothesis, the authors proposed a new method that reveals inconsistencies in both multiple modalities simultaneously and within individual modalities separately, enabling them to effectively distinguish between authentic and altered public speaking videos. Project and methods: The proposed approach is to integrate audio and visual signals in a so-called fine-grained manner, and then carry out binary classification processes based on calculated adjustments to the classification results of each modality. The method has been tested using various network architectures, in particular Capsule networks – for deep anomaly detection and Swin Transformer – for image classification. Pre-processing included frame extraction and face detection using the MTCNN algorithm, as well as conversion of audio to mel spectrograms to better reflect human auditory perception. The proposed technique was tested on multimodal deepfake datasets, namely FakeAVCeleb and TMC, along with a custom dataset containing 4,700 recordings. The method has shown high performance in identifying deepfake threats in various test scenarios. Results: The method proposed by the authors achieved better AUC and accuracy compared to other reference methods, confirming its effectiveness in the analysis of multimodal artefacts. The test results confirm that it is effective in detecting modified videos in a variety of test scenarios which can be considered an advance over existing deepfake detection techniques. The results highlight the adaptability of the method in various architectures of feature extraction networks. Conclusions: The presented method of audiovisual deepfake detection uses fine inconsistencies of multimodal features to distinguish whether the material is authentic or synthetic. It is distinguished by its ability to point out inconsistencies in different types of deepfakes and, within each individual modality, can effectively distinguish authentic content from manipulated counterparts. The adaptability has been confirmed by the successful application of the method in various feature extraction network architectures. Moreover, its effectiveness has been proven in rigorous tests on two different audiovisual deepfake datasets.
Cel: Celem artykułu jest przedstawienie hipotezy, że wykorzystanie rozbieżności w materiałach audiowizualnych może znacznie zwiększyć skuteczność wykrywania różnych typów deepfake i związanych z nimi zagrożeń. W celu weryfikacji tej hipotezy autorzy zaproponowali nową metodę, która pozwala na ujawnienie niespójności zarówno w wielu modalnościach jednocześnie, jak i w obrębie poszczególnych modalności z osobna, umożliwiając skuteczne rozróżnienie autentycznych i zmienionych filmów z wystąpieniami publicznymi. Projekt i metody: Zaproponowane podejście polega na integracji sygnałów dźwiękowych i wizualnych w tzw. drobnoziarnisty sposób, a następnie przeprowadzeniu procesów klasyfikacji binarnej na podstawie obliczonych korekt wyników klasyfikacji każdej modalności. Metoda została przebadana z wykorzystaniem różnych architektur sieci, w szczególności sieci typu Capsule – do głębokiego wykrywania anomalii oraz Swin Transformer – do klasyfikacji obrazów. Przetwarzanie wstępne obejmowało ekstrakcję klatek i wykrywanie twarzy przy użyciu algorytmu MTCNN, a także konwersję audio na spektrogramy mel, aby lepiej odzwierciedlić ludzką percepcję słuchową. Zaproponowana technika została przetestowana na multimodalnych zbiorach danych deepfake, a mianowicie FakeAVCeleb i TMC, wraz z niestandardowym zbiorem zawierającym 4700 nagrań. Metoda wykazała wysoką skuteczność w rozpoznawaniu zagrożeń deepfake w różnych scenariuszach testowych. Wyniki: Metoda zaproponowana przez autorów osiągnęła lepsze AUC i dokładność w porównaniu z innymi metodami referencyjnymi, potwierdzając swoją skuteczność w analizie artefaktów multimodalnych. Rezultaty badań potwierdzają, że skutecznie pozwala wykryć zmodyfikowane filmy w różnych scenariuszach testowych – co można uznać za postęp w porównaniu z istniejącymi technikami wykrywania deepfake'ów. Wyniki podkreślają zdolność adaptacji metody w różnych architekturach sieci ekstrakcji cech. Wnioski: Przedstawiona metoda audiowizualnego wykrywania deepfake'ów wykorzystuje drobne niespójności cech wielomodalnych do rozróżniania, czy materiał jest autentyczny czy syntetyczny. Wyróżnia się ona zdolnością do wskazywania niespójności w różnych typach deepfake'ów i w ramach każdej indywidualnej modalności potrafi skutecznie odróżniać autentyczne treści od zmanipulowanych odpowiedników. Możliwość adaptacji została potwierdzona przez udane zastosowanie omawianej metody w różnych architekturach sieci ekstrakcji cech. Ponadto jej skuteczność została udowodniona w rygorystycznych testach na dwóch różnych audiowizualnych zbiorach danych typu deepfake.
Źródło:
Safety and Fire Technology; 2023, 62, 2; 172-180
2657-8808
2658-0810
Pojawia się w:
Safety and Fire Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The progressive transmission method based on the 2-D wavelet transform for a digital video signal
Autorzy:
Murawski, K.
Powiązania:
https://bibliotekanauki.pl/articles/273329.pdf
Data publikacji:
2001
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
wavelet transform
digital transmission
video stream
multiresolution analysis
Opis:
This paper presents a method of progressive digital transmission of a video stream, based on picture frame multi-resolution analysis.
Źródło:
Biuletyn Instytutu Automatyki i Robotyki; 2001, R. 7, nr 15, 15; 15-25
1427-3578
Pojawia się w:
Biuletyn Instytutu Automatyki i Robotyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stereoscopic 3DTV Video Quality Metric: the Compressed Average Image Intensity
Autorzy:
Wilczewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/309475.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
3D image analysis
image impairments
stereoscopy
video quality
Opis:
This paper presents a newly designed stereoscopic video quality metric. Overall insights towards the creation of mechanisms utilized within the genuine metric are presented herein. Delivery of the core information and motivation behind the features implemented, as well as functionality of the Compressed Average Image Intensity (CAII) quality metric are of utmost importance. The mechanisms created might be characterized as an objective, reliable and versatile quality evaluation tool for advanced analysis of the content delivery chain within stereoscopic video services.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 2; 8-14
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vision and Performance. The Sociolinguistic Analysis of Genres and Its Application to Focussed Ethnographic Data
Autorzy:
Schnettler, Bernt
Powiązania:
https://bibliotekanauki.pl/articles/2138571.pdf
Data publikacji:
2008-12-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Video-data
Genre-analysis
Ethnography
Religious experiences
New religious movements
Opis:
The use of audiovisual recording devices is changing the practice of qualitative research. Extensive corpus of data can be generated in (shortterm) focussed fieldwork. Nevertheless, methods to analyse video data are still in an experimental stage. This article explores the benefits and limitations of applying sociolinguistic genre analysis to audio-visual data. This is illustrated with a case study, based on the videotaped »deep-trance vision« of a New Religious Movement’s spiritual leader, which is one the most famous contemporary religious visionaries in Germany. The analysis aims to reconstruct the construction of this religious experience of transcendence from the perspective of its followers. We will examine three different levels of communication (a) the inner context, exploring the textual, gestural, mimical and prosodic aspects, (b) the intermediate level where the focus lies on the setting and decorum, and finally (c) the outer context, focussing on the social embedding of this form of »transcendent« communication and its filmic presentation. The article closes with a reflection on the need to combine hermeneutic analysis of case studies based on textual analysis with ethnographic field data and observation to contextualise its interpretation.
Źródło:
Qualitative Sociology Review; 2008, 4, 3; 59-83
1733-8077
Pojawia się w:
Qualitative Sociology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
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