Self-synchronizing watermarking scheme for an arbitrarily shaped object

To protect the copyright of an arbitrarily shaped object, an oblivious and robust watermarking scheme is proposed. Different from other methods, an inertia ellipse is constructed to estimate the state of attack channel, and barycenter matching is employed to achieve fast self-synchronizing watermark detection. Watermark verification can be performed without the original image. Experimental results prove the robustness of our scheme against object manipulations, such as rotation, translation, scaling, etc.     

遥感地形图象的灰度与分形分析

为了能够更加充分、准确地在遥感地形图象中利用分形信息,需要将其与其他特征配合使用。文章通过从视觉成像的角度,深入地剖析物体不同区域的形状和位置对成像灰度的影响,进而将有关结论与图象分形指数数据相结合,应用于基于图象内容的遥感图象的区域(标识)分割,取得了令人满意的效果,从中检查出分形数据中对应于图象深灰度区无意义的数值部分,从而保证了分形数据的可靠性,同时也说明了结合灰度或其它信息于分形图象应用的图象分析方式是十分必要的。     

Learning mixtures of point distribution models with the EM algorithm

This paper demonstrates how the EM algorithm can be used for learning and matching mixtures of point distribution models. We make two contributions. First, we show how shape-classes can be learned in an unsupervised manner. We present a fast procedure for training point distribution models using the EM algorithm. Rather than estimating the class means and covariance matrices needed to construct the PDM, the method iteratively refines the eigenvectors of the covariance matrix using a gradient ascent technique. Second, we show how recognition by alignment can be realised by fitting a mixture of linear shape deformations. We evaluate the method on the problem of learning the class-structure and recognising Arabic characters.     

Blowing Bubbles for Multi-Scale Analysis and Decomposition of Triangle Meshes

Tools for the automatic decomposition of a surface into shape features will facilitate the editing, matching, texturing, morphing, compression and simplification of three-dimensional shapes. Different features, such as flats, limbs, tips, pits and various blending shapes that transition between them, may be characterized in terms of local curvature and other differential properties of the surface or in terms of a global skeletal organization of the volume it encloses. Unfortunately, both solutions are extremely sensitive to small perturbations in surface smoothness and to quantization effects when they operate on triangulated surfaces. Thus, we propose a multi-resolution approach, which not only estimates the curvature of a vertex over neighborhoods of variable size, but also takes into account the topology of the surface in that neighborhood. Our approach is based on blowing a spherical bubble at each vertex and studying how the intersection of that bubble with the surface evolves. We describe an efficient approach for computing these characteristics for a sampled set of bubble radii and for using them to identify features, based on easily formulated filters, that may capture the needs of a particular application.     

电力输送模拟与指挥系统

介绍一种可应用于区域供电管理的微机－模拟屏电力输送模拟与指挥系统。     

SMA驱动的微型平面关节机器人的研究

近年来，利用形状记忆合金（ＳＭＡ）的形状记忆效应原理制作的驱动器已在机器人领域中得到应用，ＳＭＡ驱动器以其重量轻、结构紧凑、易控制等优点，大大推动了微型机器人的发展．本课题使用所研制的推挽式直线位移型和旋转关节型ＳＭＡ驱动器代替传统的伺服驱动系统，研制了一台三自由度（两个旋转自由度和一个直线自由度）且带末端夹持器的微型平面关节机器人．本文将介绍该机器人的结构设计，控制系统及其软件设计．     

X-Window环境下图形连续滚动显示方法设计

在很多实际应用中，常常要在屏幕上对所绘图形进行显示．X－Window提供了一些显示较大图形的策略，但由于有时图形太大，系统提供的显示机制无法满足要求，这时必须设计另外的显示方案。提供的滚动显示方法不受绘图数据量大小的限制，适用于各种大小图形的屏幕显示。     

全自动实时人脸图像变形技术研究与实现

提出了一种新的人脸图像变形方法——自适应网格方法(AMM)。该方法可以全自动产生实时的人脸变形效果。ASM(主动形状模型)技术的使用消除了其他人脸变形算法中所必须的手工标定人脸关键点工作；提出一种将人脸矩形区域自动划分成数个特征矩形的方法，使得复杂的图像变形计算被化简为简单高效的图像插值计算。该工作有助于将人脸变形技术运用于桌面实时应用中。     

基于Windows流媒体技术的网络屏幕广播

在介绍Windows流媒体技术的基础上．利用WindowsMedia成功地实现了屏幕图像在Internet/Intranet上的广播。