一种快速模板匹配目标识别算法

该文拟将计算机视觉中传统模板匹配方法与对场景物体的中心矩描述方法相结合,提出了一种效率较高的匹配算法。算法在匹配识别上不仅不受物体方位旋转及尺寸缩放变化影响,而且能较精确地求出物体相对于模板的缩放比例和偏转角度。文中给出了与传统模板匹配算法对照的实验结果。     

An image rectification scheme and its applications in RST invariant digital image watermarking

This paper presents an image rectification scheme that can be used by any image watermarking algorithm to provide robustness against rotation, scaling and translation (RST) transformations. Rotation and scaling transformations in the spatial domain result in cyclically translational shifts in the log-polar mapping (LPM) of the magnitude of the Fourier transform spectrum of an image. We cut a small block from the LPM domain as a matching template. A new filtering method is proposed to compute the cross-correlation between this template and the magnitude of the LPM of the image having undergone RST transformations to detect the rotation and scaling parameters. We employ the same strategy in the spatial domain to detect the translational parameters in the spatial domain. The scheme can also be used to detect image flipping. The cost of the templates is low and the templates can even be compressed. The detection accuracy for rotation, scaling and translation is also presented. We compare the matching results for the different filters and their performance by the three criteria: signal-to-noise ratio (SNR), peak-to-correlation energy (PCE), and Horner efficiency. We demonstrate that our phase-only filtering method is the only one that can be used in the LPM domain. We also introduce three applications for this rectification scheme and give their experimental results.

基于二重循环的数字水印算法

针对现有数字水印算法中存在的抵抗联合攻击能力差、水印提取准确率不高等问题,提出了一种基于分块快速傅里叶变换(FFT)的二重循环数字水印算法.先进行图像大小归一化,对其进行分块FFT变换,在每个图像块的FFT系数中通过大小关系调制嵌入若干比特水印,水印按照二重循环嵌入.提取时从任何一个包括所有水印的图像部分中,直接通过判断FFT系数的大小关系来提取水印.实验结果表明,该算法能抵抗滤波加噪等常规信号处理攻击,JPEG压缩等压缩攻击,旋转、缩放、平移等全局几何攻击和裁剪、拼贴等特殊攻击以及它们的联合攻击,并且误码率低,接近0.     

Attribute Selection Based on Rough Set Theory for Electromagnetic Interference (EMI) Fault Diagnosis

Electromagnetic emissions are radiated from every part of a personal computer motherboard, thus producing electromagnetic interference (EMI). EMI has an adverse effect on the surrounding environment because EMI could cause malfunctions or fatal problems in other digital devices. EMI engineers diagnose motherboard EMI problems using the electromagnetic noise data measured by the spectrum analyzer. Finding the sources (e.g., PS2, USB, VGA) of electromagnetic noise is a time-consuming process. The attribute selection and fault diagnosis was developed based on the advantage of rough set theory (RST). RST is a novel data mining approach for dealing with vagueness and uncertainty. It can be used to find hidden patterns in data sets. In this study, the basic rough set theory concepts are introduced. The rough set approach enables one to discover the minimal subsets of condition attributes associated with the motherboard EMI fault diagnosis problem. The operating sequence includes data collection, data preprocessing, discretization, attribute reduction, reduction filtering, rule generation, and classification accuracy. Historical EMI noise data, colleted from a famous motherboard company in Taiwan, were used to generate diagnostic rules. Our research result (average diagnostic accuracy of 80% above) shows that the RST model is a promising approach for EMI diagnostic support systems.     

基于XML的文本规划方法

本文提出了一种基于XML的文本规划方法，命名为知识库信息规划法，是一种分层规划策略：高层借鉴RST理论，灵活规划文本的大体结构；底层借鉴Schema方法，快速规划各子语段。为缓解RST理论实现难的问题，引进了XML，提出用XML来实现待交流信息的框架式知识表示，构造基于特定规则的面向对象的知识库--XML知识库。该方法适合于根根据某种确定目标从已有的知识库中提取信息来生成篇章的系统，兼具了Schema的简单易行性和RST的灵活多样性。     

基于粗糙集理论的分层递阶约简算法􀀂

粗糙集理论的分层递阶约简算法是根据属性的获取方式、采集成本和实时性要求等对属性进行分类,使信息系统或者决策系统中的所有属性在单层次和单粒度上的知识表示变为部分属性所构成的知识在多种层次和多种粒度上的表示,从而可以逐层对信息系统进行约简.分层递阶约简算法在某水泥窑炉控制决策获取中的应用证实其有效性.     

Dendrimer as nanocarrier for drug delivery

Dendrimers are novel three dimensional, hyperbranched globular nanopolymeric architectures. Attractive features like nanoscopic size, narrow polydispersity index, excellent control over molecular structure, availability of multiple functional groups at the periphery and cavities in the interior distinguish them amongst the available polymers. Applications of dendrimers in a large variety of fields have been explored. Drug delivery scientists are especially enthusiastic about possible utility of dendrimers as drug delivery tool. Terminal functionalities provide a platform for conjugation of the drug and targeting moieties. In addition, these peripheral functional groups can be employed to tailor-make the properties of dendrimers, enhancing their versatility. The present review highlights the contribution of dendrimers in the field of nanotechnology with intent to aid the researchers in exploring dendrimers in the field of drug delivery.     

Experimental and Theoretical Studies on Desulfurization Efficiency of Dual-alkali FGD System in a RST Scrubber

The effects of operating parameters on desulfurization efficiency of a dual-alkali FGD process in a rotating-stream-tray (RST) scrubber are investigated. A dimensionless factor, e, is proposed in this study to predict desulfurization efficiency of this dual-alkali FGD system. e represents the desulfurization ability of a dual alkali FGD system, determined by five main operating parameters such as sodium ion concentration, ratio of absorbent flow rate to flue gas flow rate, pH value of absorbent solution, ratio of sulfate ion to total sulfur ion in absorbent solution, and sulfur dioxide concentration of inlet flue gas. The empirical expression for predicting desulfurization efficiency at different temperatures is obtained through the experimental study and theoretical calculation. It provides useful guide for engineering design.     

一种小波变换域上的高鲁棒灰度水印

为了提高灰度水印抵抗滤波,加噪等常见攻击以及几何攻击的能力,提出了一种小波变换域上的高鲁棒水印方案。首先对灰度水印提出了一种新颖的数据压缩方法,并且从中提取出用于水印同步的参考比特。对于受到几何攻击的水印图像,提出了在低频子带上使用图像的主轴和边缘轮廓以获得旋转和缩放参数,从而能准确快速地恢复图像。同时在中频子带上采取了一种对参考比特进行高效匹配的办法来进一步实现水印的同步。实验表明除了一般图像处理之外,对于几何变形攻击本方案具有很好的鲁棒性。