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Figure Skating Simulation from Video

computer graphics FORUM 2019年第7期38卷 225-234页

作者： Yu, Ri Park, Hwangpil Lee, Jehee Seoul Natl Univ Seoul South Korea

Figure skating is one of the most popular ice sports at the Winter Olympic Games. The skaters perform several skating skills to express the beauty of the art on ice. Skating involves moving on ice while wearing skate shoes with thin blades;thus, it requires much practice to skate without losing balance. Moreover, figure skating presents dynamic moves, such as jumping, artistically. Therefore, demonstrating figure skating skills is even more difficult to achieve than basic skating, and professional skaters often fall during Winter Olympic performances. We propose a system to demonstrate figure skating motions with a physically simulated human-like character. We simulate skating motions with non-holonomic constraints, which make the skate blade glide on the ice surface. It is difficult to obtain reference motions from figure skaters because figure skating motions are very fast and dynamic. Instead of using motion capture data, we use key poses extracted from videos on YouTube and complete reference motions using trajectory optimization. We demonstrate figure skating skills, such as crossover, three-turn, and even jump. Finally, we use deep reinforcement learning to generate a robust controller for figure skating skills.

关键词： CCS Concepts • Computing methodologies → Physical simulation Motion processing • theory of computation → Reinforcement learning

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Systematic review of a flipped learning model for the courses of descriptive geometry, engineering and computer graphics 18th

Systematic review of a flipped learning model for the course...

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18th International Conference on Geometry and graphics, ICGG 2018

作者： Voronina, Marianna Vladimirovna Ignatiev, Sergei Anatolyevich Merkulova, Viktoriya Anatolyevna Saint-Petersburg Mining University 2 21st Line St Petersburg199106 Russia

ISBN: (纸本)9783319955872

The relevance of this study is determined by absence of fundamental research in the use of flipped learning model (FLM) in teaching students of engineering universities Descriptive Geometry, Engineering and computer graphics (DGECG);by the absence of scientifically-based, tried and tested programs and teaching materials for DGECG FLM;as well as by the need of development of new, modern tools to support classroom work and forms of students’ individual work. The purpose of this study was to describe the current state of theory and practice in the field of DGECG educational process, which uses flipped concept of learning as a major pedagogical strategy. The main task was the following—to discuss the effectiveness of FLM, its advantages and disadvantages compared to traditional teaching method. The FLM approach has gained increasing popularity not only in schools but also in engineering universities. FLM creates opportunities for solutions of complex pedagogic problems in engineering education but creates some difficulties in preparing for the implementation of the model. Theoretical and practical contribution of the article materials—the synthesis of qualitative and quantitative researches of engineering courses which use a FLM. The study showed that the issues of DGECG FLM have not been investigated in the scientific and methodological literature. To create reasonable theoretical bases of pedagogy in the field of DGECG FLM as well as methods of evaluation it is necessary to conduct further scientific researches examining various aspects of the practical implementation of long-term, tried and tested programs and instructional materials for teaching students. © 2019, Springer International Publishing AG, part of Springer Nature.

关键词： Students

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The Golden Ratio in Machine Learning

The Golden Ratio in Machine Learning

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Applied Imagery Pattern Recognition Workshop (AIPR)

作者： Stefan Jaeger National Library of Medicine National Institutes of Health Bethesda MD USA

ISBN: (纸本)9781665424721

Gradient descent has been a central training prin-ciple for artificial neural networks from the early beginnings to today's deep learning networks. The most common imple-mentation is the backpropagation algorithm for training feed-forward neural networks in a supervised fashion. A drawback of backpropagation has been the search required to find optimal values of two important training parameters, learning rate and momentum weight. The learning rate specifies the step size towards a minimum of the loss function when following the gradient, while the momentum weight considers previous weight changes when updating current weights. Using both parameters in conjunction with each other generally improves training, although their specific values do not follow immediately from standard backpropagation theory. This paper proposes a new information-theoretical loss function based on cross-entropy for which it derives a specific learning rate and momentum weight. Many training procedures based on backpropagation use cross-entropy directly as their loss function. Instead, this paper investigates a dual process model with two processes, in which one process minimizes the Kullback-Leibler divergence while its dual counterpart minimizes the Shannon entropy. The golden ratio plays an important role here, allowing to derive theoretical values for the learning rate and momentum weight, matching closely the values traditionally used in the literature, which are determined empirically. To validate this information-theoretical approach further, classification results for a handwritten digit recognition task are presented, showing that the proposed loss function, in conjunction with the derived learning rate and momentum weight, works in practice.

关键词： Training Backpropagation Deep learning Handwriting recognition Image recognition Conferences Rendering (computer graphics)

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Design Exposition with Literate Visualization

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IEEE TRANSACTIONS ON VISUALIZATION AND computer graphics 2019年第1期25卷 759-768页

作者： Wood, Jo Kachkaev, Alexander Dykes, Jason City Univ London GiCtr London England

We propose a new approach to the visualization design and communication process, literate visualization, based upon and extending, Donald Knuth's idea of literate programming. It integrates the process of writing data visualization code with description of the design choices that led to the implementation (design exposition). We develop a model of design exposition characterised by four visualization designer architypes: the evaluator, the autonomist, the didacticist and the rationalist. The model is used to justify the key characteristics of literate visualization: 'notebook' documents that integrate live coding input, rendered output and textual narrative;low cost of authoring textual narrative;guidelines to encourage structured visualization design and its documentation. We propose narrative schemas for structuring and validating a wide range of visualization design approaches and models, and branching narratives for capturing alternative designs and design views. We describe a new open source literate visualization environment, litvis, based on a declarative interface to Vega and Vega-Lite through the functional programming language Elm combined with markdown for formatted narrative. We informally assess the approach, its implementation and potential by considering three examples spanning a range of design abstractions: new visualization idioms;validation though visualization algebra;and feminist data visualization. We argue that the rich documentation of the design process provided by literate visualization offers the potential to improve the validity of visualization design and so benefit both academic visualization and visualization practice.

关键词： storytelling design literate programming theory

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Interactive Virtual Reality Game for Online Learning of Science Subject in Primary Schools

Interactive Virtual Reality Game for Online Learning of Scie...

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IEEE International Conference on Teaching, Assessment and Learning for Engineering (TALE)

作者： Qi Cao Bee Teck Png Yiyu Cai Yigang Cen Di Xu School of Computing Science University of Glasgow School of Science and Technology Singapore University of Social Sciences Singapore School of Mechanical & Aerospace Engineering Nanyang Technological University Singapore School of Computer Science Information Technology Beijing Jiaotong University Beijing China AI Lab Shadow Creator Inc. Beijing China

ISBN: (纸本)9781665436885

Education plays an important role in nurturing children. COVID-19 pandemic brings challenges or disruptions to school education, due to school closures in some countries. Science subject in primary schools is unique as hands-on experiments are important learning components. Its learning process may be affected, as a new norm of online learning or home-based learning. This research project creates a serious game on science subject for primary school students aging within 10 to 11 years old using virtual reality (VR) technology. It consists of three virtual learning phases. Phase 1 explains theories of science topics on electricity and electric circuits. Phase 2 provides interactive hands-on experiment exercises where students can practice theory knowledge learned in the previous phase. An interactive quiz session is offered to reinforce the learning in Phase 3. Interactive VR features enable primary school students learning abstract science concepts in an interesting way compared to conventional classroom settings. Meticulous design attentions have been placed in the details such as visual instructions, voice instructions, speech tempo, animations, and colorful graphics to create a sense of realism and keep students actively engaged. Preliminary case study has been conducted with 10 students at primary schools in Singapore to evaluate learning effectiveness in this research.

关键词： COVID-19 Visualization Electronic learning Pandemics Education Virtual reality Games

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computer methodologies for comparison of computational efficiency of simultaneous methods for finding polynomial zeros

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JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 2020年 368卷 112513-000页

作者： Petkovic, I. Herceg, D. Univ Nis Fac Elect Engn Dept Comp Sci A Medvedeva 14 Nish 180001 Serbia Univ Novi Sad Fac Sci Dept Math & Informat Trg Dositeja Obradovic 4 Novi Sad 21000 Serbia

The study and analysis of iterative methods for the determination of zeros of algebraic polynomials, the subject of this paper, is one of the most actual tasks in the theory and practice. Our main goal is to examine and compare the quality of most frequently used methods for simultaneously finding all zeros of a polynomial by combining numerical experiments, theoretical models and empirical CPU time-methodology. Special attention is devoted to empirical average case model assuming that average CPU times are calculated performing the experiment (i) on several different computers, (ii) running each method through many loops for a fixed example, (iii) testing reasonably large number of polynomials of different structure body, and (iv) the use of (almost) arbitrary initial approximations. The empirical model ranks the tested methods on the base of the consumed CPU times needed for the fulfillment of the required accuracy of approximations under the same initial conditions. Our aim is to select a group of the most powerful simultaneous methods with globally convergent performance. Convergence behavior of two most powerful methods is illustrated by trajectories in the complex plane that consist of the point approximations, starting with initial points and going towards the endpoints where the iterative process stops due to the termination criterion. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Solving polynomial equations Comparison of root-finding methods CPU-time empirical model computer graphics Convergence behavior

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Player Experience from 3D game components - A theoretical and empirical look at computer graphics in prac- tice

Player Experience from 3D game components - A theoretical an...

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作者： Hjalmar Wilander Linkoping University

学位级别：硕士

There is currently little research about how the aesthetics of a game affects the perceived PX. Especially, the aesthetics of the individual 3D game components, such as characters, enemies and environmental objects. This thesis project studies different design principles and approaches to create 3D game components. These are used in practice to create 3D game components for a video game. The 3D game components are evaluated with qualitative and quantitative methods, with the intention to find a method for creating 3D game components that evoke a certain PX. The results show that it is possible to create 3D game components that evoke positive emotions, by using color psychology, animation theory and by designing from the developers own feelings and experiences.

关键词：

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“物”的跨维度意识：从3D到2D的变像研究

“物”的跨维度意识：从3D到2D的变像研究

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作者：邱显源国立台湾师范大学

学位级别：博士

经验总是来至于对事物的认识与了解，而事物对我们而言也是感知的意向（Intentionality）来源，在艺术创作的行为中，经验与感知是真实与艺术之间跨维度与变像的关键要素，然而随着实践技术与工具的创新，艺术也从传统逐渐过渡到数位的... 详细信息

经验总是来至于对事物的认识与了解，而事物对我们而言也是感知的意向（Intentionality）来源，在艺术创作的行为中，经验与感知是真实与艺术之间跨维度与变像的关键要素，然而随着实践技术与工具的创新，艺术也从传统逐渐过渡到数位的时代，因此研究一开始着重点，将试图从哲学与美学的角度探讨“物”的意识、感知与存在等等本质问题，并从中分析人、物与世界三者之间的艺术现象与实践关系，接着研究角度将转向影像中“物”的修辞与表现探讨，透过上述学理研究的基础建构，将有助于后续艺术实践的探讨，使论述能有连贯与完整的逻辑性。而有关技术实践部分，探讨焦点将以3D数位技术为核心，并从技术本质与原理做为分析起点，首先在探讨技术本质部分，内容包含技术的虚拟性、生成美学、几何空间等面向研究，在探讨技术原理部分，包含数位物件的网格编修、拓朴演变、变像技巧等内容分析，而过程中将适时搭配图示的辅助说明，来解说技术运用于实践上的重要观念，最终再透过分析个人作品过程，将本文中的学理与技术的探讨进行聚合与辩证。期盼透过本次的研究与实践的目的，除了作为自身创作的反思与检视之外，内容也能成为从事3D数位艺术创作与研究者的参考基础。由于本次研究特性属于创作理论为主，因此在研究方法上，将采用艺术本位研究（arts-based research，以下简称ABR）的方法，以创作实践为基础，透过文献研究、案例分析与创作实践三个面向进行资料的探讨与现象的分析，来逐步完成本次论文研究的整体架构。

关键词： 3D电脑绘图现象学影像修辞网格与拓朴数位艺术

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Implications of the Multi-Modality of User Perceived Page Load Time

Implications of the Multi-Modality of User Perceived Page Lo...

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Communication and computer Networking Conference (MedComNet), Mediterranean

作者： Flavia Salutari Diego da Hora Matteo Varvello Renata Teixeira Vassilis Christophides Dario Rossi Telecom Paris Brave Software INRIA Huawei Technologies Co. Ltd

ISBN: (数字)9781728162485

ISBN: (纸本)9781728162492

Web browsing is one of the most popular applications for both desktop and mobile users. A lot of effort has been devoted to speedup the Web, as well as in designing metrics that can accurately tell whether a webpage loaded fast or not. An often implicit assumption made by industrial and academic research communities is that a single metric is sufficient to assess whether a webpage loaded fast. In this paper we collect and make publicly available a unique dataset which contains webpage features (e.g., number and type of embedded objects) along with both objective and subjective Web quality metrics. This dataset was collected by crawling over 100 websites-representative of the top 1 M websites in the Web-while crowdsourcing 6,000 user opinions on user perceived page load time (uPLT). We show that the uPLT distribution is often multi-modal and that, in practice, no more than three modes are present. The main conclusion drawn from our analysis is that, for complex webpages, each of the different objective QoE metrics proposed in the literature (such as AFT, TTI, PLT, etc.) is suited to approximate one of the different uPLT modes.

关键词： Measurement Quality of experience Browsers Loading Rendering (computer graphics) Complexity theory Telecommunications

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TESTeLAB Guests: Expanded Animation Worlds (work in progress) 2

TESTeLAB Guests: Expanded Animation Worlds (work in progress...

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2nd IEEE Workshop on Animation in Virtual and Augmented Environments, ANIVAE 2019

作者： Gebner, Frank Theory and Practice of Visual Arts Film University Babelsberg KONRAD WOLF Germany

ISBN: (纸本)9781728132297

TESTeLAB Guests: Expanded Animation Worlds is a cross-media interface project aimed at 'experimenting with connecting the disconnected'. In this autobiographically-driven examination of high and low culture, against a sweeping backdrop of image and media history, traditional media are brought into the digital realm, subjecting them to a productive, artistic kind of hybridisation. In doing so, the panorama - one of the most popular phenomena of the pre-cinema age - is revived, while supposedly obsolete media are also cultivated anew as part of a hybrid 'future cinema'. This experimental exploration of the potential of movement, time and sound also serves to enhance the cinematographic experience and questions the basic building blocks of film under new premises. © 2019 IEEE.

关键词： Animation

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