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SEPARATING graphics FROM APPLICATION IN THE DESIGN OF USER INTERFACES

computer JOURNAL 1990年第5期33卷 437-443页

作者： NEELAMKAVIL, F MULLARNEY, O Interactive Graphics Systems Group Department of Computer Science Trinity College Dublin Ireland UK

Until recently work in the area of User Interface development has been almost entirely ad hoc. Implementors have had to rely on their own judgement not only in the area of the interface appearance and dynamics, butalso in the internal structure of interaction management. Considerable confusion exists in defining what constitutes a goodUser Interface, and in the management processes required to construct them. Insufficient software foundations and a lack offormalisms, tools and methodologies are contributing factors. To some extent these problems have been addressed by the UserInterface Management System (UIMS) community, primarily for those working on large systems. This paper describes a methodology,developed as part of the design of a User Interface Manager, aimed at providing implementors with a structure for buildinginterfaces which are separable from their underlying *** July 1988. revised May 1989.

关键词： computer graphics

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interactive VISUALIZATION OF VECTOR DATA IN UNSTRUCTURED VOLUMES

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computerS & graphics 1994年第1期18卷 73-80页

作者： FRUHAUF, T Darmstadt Technical University Department of Computer Science Interactive Graphics Systems Group Wilhelminenstrasse 7 64238 Darmstadt Germany

Particle-based flow visualization techniques are used for the investigation of huge, complex data sets from computational fluid dynamics (CFD). Particle tracing requires the interpolation of local velocity inside a discretized data set and the numerical integration, to find succeeding spatial positions of the moving particles. More and more often, CFD-data is computed on unstructured Finite Element grids, which makes interpolation and integration difficult. One strategy is to resample the unstructured volume data to a regular one. In contrast to this, this article describes how particle tracing can be performed directly inside unstructured grids, thereby preserving the quality and size of the original data for visualization: The basic idea is to perform the integration in the computational space of the individual cells of the grid. This leads to a faster computation of the particle's new position and an easier determination of the corresponding new cell into which the particle has moved. The proposed algorithms allow an interactive investigation with real-time computation of particle trajectories of huge data sets that are organized on unstructured grids.

关键词： interactive computer graphics

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Why ROSE is fast: Five optimizations in the design of an experimental database system for CAD/CAM applications 87

Why ROSE is fast: Five optimizations in the design of an exp...

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1987 ACM SIGMOD International Conference on Management of Data, SIGMOD 1987

作者： Hardwick, Martin Rensselaer Polytechnic Institute Department of Computer Science and Center for Interactive Computer Graphics United States

ISBN: (纸本)9780897912365

ROSE is an experimental database system for CAD/CAM applications that organizes a database into entries and relationships. The data model of ROSE is an extension of the relational model and the data manipulation language is an extension of the relational algebra. Internally, ROSE is organized so that it can use operating system services to implement database system services. In this paper we describe five optimizations that have helped to make ROSE a fast database system for CAD/CAM. © 1987 ACM.

关键词： computer aided design

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ALGORITHMS FOR PARALLEL PROCESSING - CURVE AND SURFACE DEFINITION WITH Q-SPLINES

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computerS & graphics 1979年第3-4期4卷 165-176页

作者： HAZONY, Y Interactive Computer Graphics Laboratory Department of Civil Engineering and Computer Center Princeton University Princeton NJ 08544 U.S.A.

The emergence of parallel array processing, both in software methodology and hardware technology, opens new avenues for the implementation and optimization of systems for interactive computer graphics. The Q -spline interpolation method is presented, designed for incremental curve definition, local curve modification, “on-the-curve” control points and computational efficiency in array processing environment. The implementation and performance of the algorithms in the environment of a general purpose interactive computer graphics system is described.

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TEXTURE SYNTHESIS TECHNIQUES FOR computer-graphics

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computerS & graphics-UK 1985年第2期9卷 139-+页

作者： KAUFMAN, A AZARIA, S Center of Computer Graphics Department of Mathematics and Computer Science. Ben-Gurion University of the Negev Beer-Sheva 84120 Israel

Five primary approaches to texture synthesis for computer graphics are surveyed: a syntactic approach, a statistical approach, a growth model approach, a computer drafting approach, and a stochastic modeling approach. Most of these methods, derived from texture analysis techniques or from mathematical models of texture, have a relatively low-level, cumbersome way to define, manipulate, or input textures. As an alternative, a high-level language approach is proposed. It provides easy-to-use coding mechanisms to define, synthesize, and manipulate textures. The high-level approach is introduced by means of the Texture Synthesis Language (TSL).

关键词： computer graphics

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Learning dissection trajectories from expert surgical videos via imitation learning with equivariant diffusion

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Medical Image Analysis 2025年 103卷 103599页

作者： Wang, Hongyu Long, Yonghao Chen, Yueyao Yip, Hon-Chi Scheppach, Markus Chiu, Philip Wai-Yan Yam, Yeung Meng, Helen Mei-Ling Dou, Qi Department of Computer Science and Engineering The Chinese University of Hong Kong Hong Kong Department of Surgery The Chinese University of Hong Kong Hong Kong Internal Medicine III - Gastroenterology University Hospital of Augsburg Augsburg Germany Multi-scale Medical Robotics Center and The Chinese University of Hong Kong Hong Kong Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong Centre for Perceptual and Interactive Intelligence and The Chinese University of Hong Kong Hong Kong

Endoscopic Submucosal Dissection (ESD) constitutes a firmly well-established technique within endoscopic resection for the elimination of epithelial lesions. Dissection trajectory prediction in ESD videos has the potential to strengthen surgical skills training and simplify surgical skills training. However, this approach has been seldom explored in previous research. While imitation learning has proven effective in learning skills from expert demonstrations, it encounters difficulties in predicting uncertain future movements, learning geometric symmetries and generalizing to diverse surgical scenarios. This paper introduces imitation learning for the critical task of predicting dissection trajectories from expert video demonstrations. We propose a novel Implicit Diffusion Policy with Equivariant Representations for Imitation Learning (iDPOE) to address this variability. Our method implicitly models expert behaviors using a joint state–action distribution, capturing the inherent stochasticity of future dissection trajectories and enabling robust visual representation learning across various endoscopic views. By incorporating a diffusion model in policy learning, our approach facilitates efficient training and sampling, resulting in more accurate predictions and improved generalization. Additionally, we integrate equivariance into the learning process to enhance the model's ability to generalize to geometric symmetries in trajectory prediction. To enable conditional sampling from the implicit policy, we develop a forward-process guided action inference strategy to correct state mismatches. We evaluated our method using a collected ESD video dataset comprising nearly 2000 clips. Experimental results demonstrate that our approach outperforms both explicit and implicit state-of-the-art methods in trajectory prediction. As far as we know, this is the first endeavor to utilize imitation learning-based techniques for surgical skill learning in terms of dissection trajector

关键词： Endoscopy

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Rose: An object-oriented database system for interactive computer graphics applications 2nd

Rose: An object-oriented database system for interactive com...

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2nd International Workshop on Object-Oriented Database Systems, 1988

作者： Hardwick, Martin Spooner, David L. Computer Science Department and Center for Interactive Computer Graphics Rensselaer Polytechnic Institute TroyNY12180 United States

ISBN: (纸本)9783540503453

In summary, the ROSE system has been designed to allow efficiency to be combined with fiexibility for support of interactive computer graphics applications. The object paradigm is exploited throughout all aspects of the ROSe system because it provides a natural data organization for graphical data, and because it leads to clustering ofdata in secondary storage to maximize the performance of data retrieval as demanded by high performance interactive computer graphics applications such as engineering design. © 1988, Springer-Verlag.

关键词： interactive computer graphics

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Compressed progressive meshes (vol 6, pg 79, 2000)

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IEEE TRANSACTIONS ON VISUALIZATION AND computer graphics 2000年第2期6卷 190-192页

作者： Pajarola, R Rossignac, J Information and Computer Science Department University of California Irvine Graphics Visualization and Usablity Center Georgia Institute of Technology

Most systems that support visual interaction with 3D models use shape representations based on triangle meshes. The size of these representations imposes limits on applications for which complex 3D models must be accessed remotely. Techniques for simplifying and compressing 3D models reduce the transmission time. Multiresolution formats provide quick access to a crude model and then refine it progressively. Unfortunately, compared to the best nonprogressive compression methods, previously proposed progressive refinement techniques impose a significant overhead when the full resolution model must be downloaded. The CPM (Compressed Progressive Meshes) approach proposed here eliminates this overhead. It uses a new technique, which refines the topology of the mesh in batches, which each increase the number of vertices by up to 50 percent. Less than an amortized total of 4 bits per triangle encode where and how the topological refinements should be applied. We estimate the position of new vertices from the positions of their topological neighbors in the less refined mesh using a new estimator that leads to representations of vertex coordinates that are 50 percent more compact than previously reported progressive geometry compression techniques.

关键词： Triangle mesh compression Progressive Meshes Multiresolution Modeling Geometry Compression

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Formation sketching: An approach to stylize groups in crowd simulation

Formation sketching: An approach to stylize groups in crowd ...

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37th graphics Interface Conference, GI 2011

作者： Gu, Qin Deng, Zhigang Computer Graphics and Interactive Media Lab. Department of Computer Science University of Houston United States

ISBN: (纸本)9781450306935

Most of existing crowd simulation algorithms focus on the moving trajectories of individual agents, while collective group formations are often roughly learned from video examples or manually specified via various hard constraints (e.g., pre-defined keyframes of exact agent distributions). In this paper, we present an intuitive yet efficient approach to generate arbitrary and precise group formations by sketching formation boundaries. Our approach can automatically compute the desired position of each agent in the target formation and generate the agent correspondences between keyframes. When high-level group formations need to be formed on-the-fly in a dynamic environment such as "switching to the circle formation at about one hundred meters ahead", our algorithm will coordinate and compute appropriate actions for each agent by seamlessly fusing local formation dynamics and global group locomotion. Through a number of experiments, we demonstrate that our approach is efficient and adaptive to variations of group scales (i.e., number of agents), group positions, and environment obstacles. Copyright held by authors.

关键词： Three dimensional computer graphics

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Perceptually guided expressive facial animation 8

Perceptually guided expressive facial animation

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8th ACM SIGGRAPH/Eurographics Symposium on computer Animation, SCA 2008

作者： Deng, Zhigang Ma, Xiaohan Computer Graphics and Interactive Media Lab Department of Computer Science University of Houston HoustonTX United States

ISBN: (纸本)9783905674101

Most of current facial animation approaches largely focus on the accuracy or efficiency of their algorithms, or how to optimally utilize pre-collected facial motion data. However, human perception, the ultimate measuring stick of the visual fidelity of synthetic facial animations, was not effectively exploited in these approaches. In this paper, we present a novel perceptually guided computational framework for expressive facial animation, by bridging objective facial motion patterns with subjective perceptual outcomes. First, we construct a facial perceptual metric (FacePEM) using a hybrid of region-based facial motion analysis and statistical learning techniques. The constructed FacePEM model can automatically measure the emotional expressiveness of a facial motion sequence. We showed how the constructed FacePEM model can be effectively incorporated into various facial animation algorithms. For the sake of clear demonstrations, we choose data-driven expressive speech animation generation and expressive facial motion editing as two concrete application examples. Through a comparative user study, we showed that comparing with the traditional facial animation algorithms, the introduced perceptually guided expressive facial animation algorithms can significantly increase the emotional expressiveness and perceptual believability of synthesized facial animations. © The Eurographics Association 2008.

关键词： Animation

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