计算机中用flash脚本语言实现下雨动画效果的方法

该文主要介绍了计算机中用flash脚本语言实现下雨动画效果的方法。     

一种基于细节特征的MCA多聚焦图像融合方法

针对多聚焦图像的特点,提出一种形态分量分析分解下的基于细节特征的图像融合方法。该方法首先将原图像分解成光滑部分和纹理部分。其次,为了充分体现多聚焦的纹理特征,在光滑部分采用微分算子定义的细节特征作为融合规则。最后,在纹理部分采用选择绝对值作为纹理部分的活跃程度的度量,绝对值最大法作为其融合规则。实验结果表明,该算法得到的融合图像优于其他多聚焦融合的算法。     

A geometric approach to animating thin surface features in smoothed particle hydrodynamics water

We propose a geometric approach to animating thin surface features of smoothed particle hydrodynamics‐based water. Explicit interparticle connections are created among smoothed particle hydrodynamics particles to approximate the geometries of thin surfaces while addressing the issue of unresolved surface areas. The deformations measured on the connections actuate the animations of the surfaces by disconnecting the stretched and bent connections. The reconstruction of thin surfaces and the accuracy of the animation are improved by adding auxiliary particles over the connections via Poisson‐disk sampling. Copyright © 2014 John Wiley & Sons, Ltd.     

Physically‐based forehead animation including wrinkles

Physically‐based animation techniques enable more realistic and accurate animation to be created. We present a fully physically‐based approach for efficiently producing realistic‐looking animations of facial movement, including animation of expressive wrinkles. This involves simulation of detailed voxel‐based models using a graphics processing unit‐based total Lagrangian explicit dynamic finite element solver with an anatomical muscle contraction model, and advanced boundary conditions that can model the sliding of soft tissue over the skull. The flexibility of our approach enables detailed animations of gross and fine‐scale soft‐tissue movement to be easily produced with different muscle structures and material parameters, for example, to animate different aged skins. Although we focus on the forehead, our approach can be used to animate any multi‐layered soft body. © 2014 The Authors. Computer Animation and Virtual Worlds published by John Wiley & Sons, Ltd.     

Action recognition on motion capture data using a dynemes and forward differences representation

In this paper we introduce a novel method for action/movement recognition in motion capture data. The joints orientation angles and the forward differences of these angles in different temporal scales are used to represent a motion capture sequence. Initially K-means is applied on training data to discover the most representative patterns on orientation angles and their forward differences. A novel K-means variant that takes into account the periodic nature of angular data is applied on the former. Each frame is then assigned to one or more of these patterns and histograms that describe the frequency of occurrence of these patterns for each movement are constructed. Nearest neighbour and SVM classification are used for action recognition on the test data. The effectiveness and robustness of this method is shown through extensive experimental results on four standard databases of motion capture data and various experimental setups.     

Geometry‐Driven Local Neighbourhood Based Predictors for Dynamic Mesh Compression

The task of dynamic mesh compression seeks to find a compact representation of a surface animation, while the artifacts introduced by the representation are as small as possible. In this paper, we present two geometric predictors, which are suitable for PCA‐based compression schemes. The predictors exploit the knowledge about the geometrical meaning of the data, which allows a more accurate prediction, and thus a more compact representation. We also provide rate/distortion curves showing that our approach outperforms the current PCA‐based compression methods by more than 20%.     

自动弯曲机弯曲模的CAD和CAM系统

本文介绍自动弯曲机弯曲模的ＣＡＤ、ＣＡＭ系统。文中分析常规方法设计弯曲模所存在的困难，提出弯曲成形动态模拟的思想，建立弯曲成形的数学模型和力学模型，介绍成型模拟的计算方法。文中发展了设计及修改凸轮廓线的方法，从而保证凸轮廓线上各点的几何连续。研究两种干涉检查方法（图形显示法，计算法），为模具和凸轮的合理设计提供了有效的评价依据。     

用微机进行双曲柄式渐开线少齿差行星齿轮传动原理的动画设计

双曲柄式渐开线少齿差行星齿轮传动，是一种性能优良的传动型式。它比一般渐开线少齿差传动体积小、重量轻、效率高、传动比大。近年来引起了国内外的重视。本文对该传动的性能、结构、原理做了简单介绍后，详细地叙述了该传动原理的二维动画片的设计和制作方法。并成功地制作了动画片。这对该传动形式的推广应用及教学实践都具有深远的意义。     

机器人运动仿真和三维图形动画技术

本文介绍机器人运动的三维图形动态仿真和动画技术．针对微机的视频特征，提出了两种动画技术．一是＂画面存贮、重放＂动画技术；二是＂图形页面互换＂动画技术，亦即＂实时动画＂技术．文中还提出了提高动画效果的策略．这两种动画技术在我们开发的机器人离线编程系统中都已得到实现．文中最后还给出了ＡＢＢ机器人进行点焊仿真的三维图形．     

结合平衡控制的动作过渡算法

为了有效地利用运动捕获数据来驱动虚拟人物,研究了动作过渡中的约束求解问题,该运动学约束求解可由解析的IK算法快速完成,但对每帧附加约束,以保证解的连续性,同时,为了使生成的动作更加真实,提出了一种在动作过渡的关键点求取平衡姿势的方法,并通过构造偏移映射,将其叠加到已生成的动作过渡序列图象上,从而较好地模拟了动态平衡过程。