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Adaptive Volume Modeling and Rendering for Volume-based Haptic Communication

基于体积的触觉通信的自适应体积建模和渲染

基本信息

批准号：
17200013
负责人：
TANAKA Hiromi T.
金额：
$ 30.45万
依托单位：
Ritsumeikan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17200013/
关键词：
Image Understanding Visualization Artificial Intelligence Virtual Reality 画像,文章,音声等認識

项目摘要

Surgical training systems are needed for practices of surgical tasks. In such systems, shapes and deformations of objects must be fast calculated correctly to get realistic simulations. Generally triangles or tetrahedra, which are mesh elements, are used to represent virtual objects. However, when the number of mesh elements increase, the calculation time also increase. Moreover, we need much time if meshes are reassembled from the beginning, when we want to represent meshes according to deformations of virtual objects and interraction of virtual surgical tools.The first objective of this work is to construct a multi resolution tetrahedral representation of input volume data. This representation adapts to gradient of field values while preserving their discontinuities. In this paper, we present a tetrahedral adaptive representation technique. We have developed a parallel algorithm of tetrahedral adaptive mesh generation, according to local field properties such as the orientation and c … More urvature of iso-surfaces, until the entire volume has been approximated within a specified level.Next, we have developed the algorithm for online remeshing of tetrahedral adaptive mesh. model, to enable real-time simulation of a soft object. It allows fast dynamic structural modifications of tetrahedral adaptive mesh, according to stretch ration of edges of tetrahedra. We divide or simplify a mesh locally to implement real-time online remeshing by inputting an adaptive tetrahedral volumetric model of a soft object that has been adapted in response to the complexity of the volume of the soft object, then subjecting the tetrahedra to recursive binary splitting and merging in response to an arbitrary deformation of the mesh structure while online.Finally, we have developed a novel volume-based haptic communication system, based on online remesh simulation of adaptive tetrahedral volume model, which allows participants at remote, sites on the network to simultaneously interact with the same target object in virtual environments, by only exchanging a small set of manipulation parameters for the target object. We first developed an online-remesh volume model, we call dynamic adaptive grids, for simulating deformable objects such as soft tissues in each remote site. Then haptic sensation during interaction with the target object, is achieved by rendering the reflection force from the object, simulated with the online-remesh volume model from the manipulation parameters exchanged among all remote sites. Less

手术任务的练习需要手术训练系统。在此类系统中，必须快速正确地计算物体的形状和变形才能获得真实的模拟。通常使用三角形或四面体作为网格元素来表示虚拟对象。然而，当网格单元数量增加时，计算时间也会增加。此外，当我们想要根据虚拟对象的变形和虚拟手术工具的交互来表示网格时，如果从一开始就重新组装网格，我们需要很多时间。这项工作的第一个目标是构造输入体数据的多分辨率四面体表示。这种表示适应场值的梯度，同时保留它们的不连续性。在本文中，我们提出了一种四面体自适应表示技术。我们开发了一种四面体自适应网格生成的并行算法，根据等值面的方向和等值线等局部场属性，直到整个体积被逼近到指定水平内。接下来，我们开发了四面体自适应网格的在线重新网格划分算法。模型，以实现软物体的实时模拟。它允许根据四面体边缘的拉伸比对四面体自适应网格进行快速动态结构修改。我们在本地划分或简化网格，以实现实时在线重新网格化，方法是输入软物体的自适应四面体体积模型，该模型已根据软物体体积的复杂性进行了调整，然后对四面体进行递归二元分裂和合并，以响应在线网格结构的任意变形。最后，我们开发了一种新颖的基于体积的触觉通信系统，基于在线自适应四面体体积模型的重新网格模拟，允许网络上远程站点的参与者通过仅交换目标对象的一小组操纵参数来同时与虚拟环境中的同一目标对象进行交互。我们首先开发了一种在线重新网格体模型，我们称之为动态自适应网格，用于模拟每个远程站点中的可变形物体，例如软组织。然后，通过渲染来自对象的反射力来实现与目标对象交互期间的触觉感觉，并根据所有远程站点之间交换的操作参数使用在线重新网格体积模型进行模拟。较少的