63 research outputs found
Construction de facettes 3D par stéréovision intégrant des principes de géométrie projective
No full textNot availableLe travail présenté dans ce mémoire s'inscrit dans le cadre de la vision artificielle et l'objectif recherche est de développer un processus de reconstruction stéréoscopique des facettes 3D des scènes observées. Le principe fondamental que nous avons suivi pour réaliser la construction de facettes 3D a été d'éviter dans la mesure du possible, tout calcul direct sur les segments 3D. Nous avons alors proposé un protocole d'utilisation de l'information région et l'information contour pour construire des indices 2D: facettes 2D par l'intermédiaire desquels nous inférons l'existence d'un plan 3D. Utilisant ensuite des techniques de géométrie projective, nous vérifions en 2D la validité de l'hypothèse de planarité relative à chacun de ces indices. La recherche des paramètres de chacune des facettes 3D de la scène utilise alors toute l'information acquise en 2D concernant les propriétés 3D à vérifier par ces facettes à construire. Cette reconstruction permet ainsi de maintenir la propriété de planarité ou encore de coplanarité entre facettes améliorant la localisation 3D de ces primitive
A comparative study of deep learning models for granulometry image based estimation of concrete aggregate
No full textObtaining the granulometry is the starting point of our pipeline for automating the calculation of concrete properties using images. For this reason, we focus on developing the best deep learning model that can compute aggregate gradation and generalize to images obtained from different aggregate producers. Therefore, we conduct a comparative analysis between different existing deep learning models and use three datasets to evaluate them : two publicly available and one of our own.Our analysis shows that transfer learning followed by fine-tuning on ViT\_16 outperforms the other models, on both classification and regression tasks, with smaller errors and greater generalization capabilities
Strength readiness of lower limb volleyball players in selected specializations
No full textAuthor: Tomáš Houda Title: Strength readiness of lower limb volleyball players in selected specializations Objectives: Strength readiness of the lower limbs of extra-league volleyball players. Study of a test battery to measure the given area. Then I will compare two extra-league teams and players from different positions (hitter vs. hitter, setter vs. setter...). From each position, I will choose one player and compare him with a player from the other team. In addition, I will focus on injuries to the lower limbs in volleyball. Methods: Observation and comparison of selected individuals from designated positions in volleyball and comparison of their strength readiness within their intensities in training, gyms, and matches. Annotation: This study researches lower limb strength readiness in volleyball players and its relationship to volleyball performance. The aim is to evaluate specific exercise methods and training programs aimed at strengthening the muscles of the lower limbs in these athletes. Through the analysis of various exercise interventions and the testing of volleyball players, the effects of these programs on improving performance, such as kick power, jumping explosiveness, stability, and speed of movement on the court, are examined. The results of this study may provide a more..
New attempts at Electronic Documents in Transport. Bolero - the end of the experiment, the beginning of the future?
No full textIn this thesis the author examines a 'revolution' taking place in the shipping industry brought on by the development of computerisation, electronic commerce and the change from paper documentation to electronic documentation in the carriage of goods by sea. The focus of the paper is on Bolero, a project of the European Community beginning in the early 1990s and which has been used commercially since September 1999. In this paper the author follows the Bolero project from its inception as an experiment through to its commercial application. The question is asked to what extent Bolero has become an alternative to, or in fact replaced paper documentation in the carriage of goods by sea. As an introduction the author looks at the paper bill of lading and other forms of sea transport documentation with a focus on their advantages and disadvantages. He then examines the development of EDI and paperless sea transport documentation, in particular Bolero and the history of its development. Following this is an in depth investigation of the Bolero system in its current form, the contractual relations involved and the position of Bolero in the surrounding legal framework in a South African and international context. Finally the author looks at the future of Bolero as a commercial enterprise
Construction of 3D Views from Strereoscopic Triplet of Images
No full textInternational audienceWe present an approach to construct; 3D facets using trinocular stereovision and characterize them by a set of reliable attributes. A facet of a polyedric object is supposed to be projected on the image plane as a homogeneous region surrounded by a chain of 2D segments. These ordered chains, called 2D facets, are extracted from each image of a stereoscopic triplet using the cooperation between single contour map and a series of region maps. These maps are automatically generated according to a coarse-to-fine approach, in order to make the most contrasted regions appear first. The 3D facets are then reconstructed by a technique based on the cooperation of 2D information (2D facets and 2D segments) and 3D information (3D segments provided by a stereovision algorithm). The difficult point is the ordering of the 3D segments constituting the sides of a 3D facet, and is solved by an original algorithm which uses the ordering of three matched 2D facets. Each 3D facet is characterized by a set of intrinsic and extrinsic parameters in order to be efficiently used during the 3D reconstruction of the object to be modelled. As an example, we explain the estimation of the surface of a facet. The original contributions of this work are the cooperation between several heterogeneous data and the use of low quality images, which require robust algorithms
HANSEN: Human and AI Spoken Text Benchmark for Authorship Analysis
No full textAuthorship Analysis, also known as stylometry, has been an essential aspect of Natural Language Processing (NLP) for a long time. Likewise, the recent advancement of Large Language Models (LLMs) has made authorship analysis increasingly crucial for distinguishing between human-written and AI-generated texts. However, these authorship analysis tasks have primarily been focused on written texts, not considering spoken texts. Thus, we introduce the largest benchmark for spoken texts - HANSEN (Human ANd ai Spoken tExt beNchmark).
HANSEN encompasses meticulous curation of existing speech datasets accompanied by transcripts, alongside the creation of novel AI-generated spoken text datasets. Together, it comprises 17 human datasets, and AI-generated spoken texts created using 3 prominent LLMs: ChatGPT, PaLM2, and Vicuna13B. To evaluate and demonstrate the utility of HANSEN, we perform Authorship Attribution (AA) & Author Verification (AV) on human-spoken datasets and conducted Human vs. AI spoken text detection using state-of-the-art (SOTA) models. While SOTA methods, such as, character ngram or Transformer-based model, exhibit similar AA & AV performance in human-spoken datasets compared to written ones, there is much room for improvement in AI-generated spoken text detection. The HANSEN benchmark is available at: https://huggingface.co/datasets/HANSEN-REPO/HANSEN
The Socialist Bar and Bartender Phenomenon
No full textThis dissertation deals with the profession of bartender between years 1958 and 1988 in socialist Czechoslovakia. It describes the development of mixology after the WW2 and difficulties it was facing in the socialist period up to late Eighties. Through interviews with contemporary witnesses, the author examines bad habits, shortcomings and abuses of the system behind the bar. Attention is paid to the availability and shortages of different kinds of alcohol and non-alcoholic drinks. The author also looks at bartenders as illicit moneychangers. The work analyses regulatory laws valid at this period and offers compact description of the most interesting and popular bars in Prague at that time
"Everyone around them is an enemy" - Czech men and women in the Israeli Sar-El volunteer program
No full textThe thesis deals with the Israeli volunteer program Sar-El, which includes unarmed service at Israeli military bases in the uniform of the Israel Defense Forces (IDF), and the historical subjectivity of its participants. Using the oral history method, the author reconstructs the form of partial aspects of the program and searches for the historical subjectivity of the narrators from a post-positivist perspective. He deals with the perception of time and space on the base, the work activities performed by the volunteers, their relations with the IDF members, the gamification of the service or the images of the enemy. In the section dedicated to historical subjectivity, the author analyses narratives related to family history, the Holocaust, Czechoslovak arms aid to Israel, German-Jewish relations, and literary and audiovisual works. At the end of the thesis, the graduate answers questions about the subjective experience of the volunteers and their perception of the program
Milada Horakova as the symbol of anti-communist opposition after February 1948
No full textThis bachelor thesis analyses historical sources and other literature and compares them to find out what had led to the execution of Milada Horakova in the respective trial. The author concluded that there is certain correlation between political opinion of this politician and her conviction in the respective political trial. Certainly, even other factors played some role
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