一种可视二维条码设计

融合信息隐藏与二维条码编译码技术,提出一种基于图像的可视二维条码设计。对图像进行块误差扩散,得到的半色调图像作为码图,将编码块嵌入置乱后的码图,反置乱使编码块分散在码图中。与以往提出的图像条码相比,该设计注重图像的可视性,可以表达图像信息。实验结果表明,该设计效果较好。     

面向入侵检测的改进BMHS模式匹配算法

模式匹配算法是入侵检测系统中使用较多的一种算法。分析几种常用模式匹配算法,提出一种基于BMHS的改进算法——N-BMHS算法。该算法对字符串进行双向模式匹配,引入一个新的数组s记录模式串中字符的出现次数,次数为1时可以利用已匹配的信息来辅助得到模式串的最大移动距离。实验结果表明,改进的模式匹配算法能减少比较次数,有效提高匹配速度。     

基于小波估计和直方图特征的LSB匹配分析

针对隐写分析中的难点——空域LSB匹配隐写进行检测和分析,描述LSB匹配加性隐写的特点,将匹配隐写建模为图像受到一定强度的脉冲噪声干扰,采用小波变换对退化的图像进行恢复作为载体的估计。对检测图像和恢复图像提取多个直方图特征比值作为特征向量,利用支持向量机对500幅高质量未压缩的自然图像组成的载体、载密图像库进行检测,结果证明该算法在低嵌入率下可获得较好的检测效果。     

基于纹理分析的视差估计算法

针对传统方法难以可靠估计图像中纹理单一像素点视差的问题,提出一种新的基于纹理分析的视差估计算法。与已有方法不同,在以极线约束计算像素点视差时,将极线上纹理单一且近似的像素点合并成直线段,根据连续性和唯一性约束对直线段进行整体匹配,采用直线段的视差得到纹理单一区域的稠密视差图。利用直线段进行整体匹配,提高比较基元包含的信息量,减少扫描范围,从而降低误匹配产生的概率和算法时间复杂度。实验结果表明,该方法能提高纹理单一区域稠密视差图的精度,匹配速度快,具有实用价值。     

Template-based quadrilateral meshing

Generating quadrilateral meshes is a highly non-trivial task, as design decisions are frequently driven by specific application demands. Automatic techniques can optimize objective quality metrics, such as mesh regularity, orthogonality, alignment and adaptivity; however, they cannot make subjective design decisions. There are a few quad meshing approaches that offer some mechanisms to include the user in the mesh generation process; however, these techniques either require a large amount of user interaction or do not provide necessary or easy to use inputs. Here, we propose a template-based approach for generating quad-only meshes from triangle surfaces. Our approach offers a flexible mechanism to allow external input, through the definition of alignment features that are respected during the mesh generation process. While allowing user inputs to support subjective design decisions, our approach also takes into account objective quality metrics to produce semi-regular, quad-only meshes that align well to desired surface features.     

The thin plate spline robust point matching (TPS-RPM) algorithm: A revisit

This paper reviews the TPS-RPM algorithm (Chui and Rangarajan, 2003) for robustly registering two sets of points and demonstrates from a theoretical point of view its inherent limited performance when outliers are present in both point sets simultaneously. A double-sided outlier handling approach is proposed to overcome this limitation with a rigorous mathematical proof as the underlying theoretical support. This double-sided outlier handling approach is proved to be equivalent to the original formulation of the point matching problem. For a practical application, we also extend the TPS-RPM algorithms to non-rigid image registration by registering two sets of sparse features extracted from images. The intensity information of the extracted features are incorporated into feature matching in order to reduce the impact from outliers. Our experiments demonstrate the double-sided outlier handling approach and the efficiency of intensity information in assisting outlier detection.     

安迪·沃霍尔:消费社会的巫师

安迪·沃霍尔用机械复制的手法去表达他所要表达的内容,丝网作业法就是他要消除艺术家的个人手法的一种方法,"重复"和"挪用"被他用到了无以复加的地步。在消费社会高度发展的时代,安迪·沃霍尔用大众文化挑战了大众文化,但他的艺术成为了"批评性的艺术"。艺术进入大众文化,并不等于说它本身就是大众文化了,本文试图从安迪·沃霍尔的艺术入手来探讨艺术与消费社会的关系。     

浙江石窗艺术的审美趣味和表现手法

浙江石窗是第二批浙江省非物质文化遗产名录中的一项民间美术,它是盛开在浙江大地上的一朵建筑民俗之花,它的审美趣味与当地的民风民俗和建筑风格完全融合,它的表现手法与中国的吉祥图案一脉相连。     

On the combinatorial complexity of fuzzy pattern matching in music analysis

In music analysis it is a common requirement to search a musical score for occurrences of a particular musical motif and its variants. This tedious and time-consuming task can be carried out by computer, using one of several models to specify which variants are to be included in the search. The question arises: just how many variants must be explicitly considered? The answer has a profound effect on the computer time needed. In this paper, recurrence relations and closed form analytic expressions are derived for the run time complexity of two models of fuzzy pattern matching for use in music analysis; each model assumes the existence of an atomic exact pattern matching operation. The formulae so obtained are evaluated and tabulated as a function of their independent parameters. These results enable a priori estimates to be made of the relative run times of different music searches performed using either model. This is illustrated by applying the results to an actual musical example.Richard E. Overill, BSc, PhD, C.Math, FIMA, C.Eng, MBCS, MIEE, is Lecturer in Computer Science at King's College London. His research includes the design, analysis, and practical implementation of algorithms on supercomputers. He has also given lecture-recitals on the keyboard music of the Tudor composers Thomas Tallis (1985), John Blitheman (1991), and William Byrd (1993).     

经典传说的新语境分析:以牛郎织女传说为例

牛郎织女传说作为我国四大传说之一,在历史传承中发生了文化变迁,其影响日益式微。在当代语境下,后现代主义思潮的推动,新科技手段的应用,为牛郎织女传说的传承提供了新的机遇。本文拟就对牛郎织女历史语境及当代语境作出分析,同时对牛郎织女未来保护与传承进行构想与展望,思考牛郎织女传说的发展辙迹。