基于自然接触传感器的智能控制手柄

研究开发了一种用于控制手柄的自然接触传感器组.该传感器组能够实时地测量皮肤血流容积、皮肤导电性、皮肤温度和握力等人体生理信号,同时不会改变和打扰人原来的工作状态.传感器的设计是基于自然接触理念,通过包覆的方式安置到控制手柄上,以保证人和传感器的自然接触,包覆有此类传感器的手柄称为智能控制手柄,实验结果显示智能控制手柄具...     

基于H．264／AVC视频流的双水印算法

针对H．264／AVC编码标准的新特性,提出一种基于H．264／AVC低比特率视频流的双水印算法,将鲁棒水印嵌入DCT域中,把脆弱水印嵌入运动矢量残差中,达到对视频版权保护和视频内容完整性认证的双重目的。实验结果表明,该算法对视频质量和码率的影响较小,鲁棒水印能有效抵抗高斯噪声、低通滤波、重编码以及轻微的抖动失真等常见的视频攻击,脆弱水印对视频内容的轻微修改具有较强的敏感性。     

Parallel particle filter for tracking road centrelines from high-resolution SAR images using detected road junctions as initial seed points

Acquiring road junction information is helpful for improving the quality of road network extraction. This article presents a new road network extraction method with three stages. First, road junction candidates are extracted by our previously proposed valley-finding algorithm. Second, numerous particle filters running in parallel track road centrelines starting from all of the detected junction candidates. Finally, the road centrelines are approximated by fitting the tracked centrepoints. The main contribution of this article lies in two aspects. First, road centrepoint tracking routes are launched simultaneously by considering the detected road junctions as starting points, which helps overcome the interference of various obstacles. Second, parallel tracking is implemented by a graphics processing unit (GPU) running accelerated particle filters, which significantly improves the execution time of the road network extraction task. The experimental results show that our proposed method not only handles various obstacles that occur on the roads capably, but also, on average, is 10.5 times as fast as previous methods. We compared the proposed method with two other existing methods in the literature using two different synthetic aperture radar (SAR) images to validate the superior performance of our proposed method.     

A novel Minkowski-distance-based consensus clustering algorithm

Consensus clustering is the problem of coordinating clustering information about the same data set coming from different runs of the same algorithm. Consensus clustering is becoming a state-of-the-art approach in an increasing number of applications. However, determining the optimal cluster number is still an open problem. In this paper, we propose a novel consensus clustering algorithm that is based on the Minkowski distance. Fusing with the Newman greedy algorithm in complex networks, the proposed clustering algorithm can automatically set the number of clusters. It is less sensitive to noise and can integrate solutions from multiple samples of data or attributes for processing data in the processing industry. A numerical simulation is also given to demonstrate the effectiveness of the proposed algorithm. Finally, this consensus clustering algorithm is applied to a froth flotation process.     

球杆网络化控制系统的延时分析与控制方法研究

对球杆系统进行了机理建模,并针对球杆网络化控制系统网络负载小、节点少、带宽冗余等特点,从网络通信原理的角度分析了网络延时的不确定性,结合测试结果提出了具有时变性、分段保持性延时特征的网络环境的假设.在这个前提下,将网络分布时延转换为前向通道上的单一时延.在此基础上提出了球杆网络化控制系统的根据延时分段补偿控制的策略及在...     

基于给定访问序列的NFS预取技术

网络文件系统(Network Filc System)由于其稳定、易用而得到了广泛的应用。为了提高NFS服务器端的I/O性能,提出一种在给定客户端访问序列的NFS服务器端伪随机序列预取(NPRP: NFS Pseudo Random Prefetch)机制。实验测试结果表明,NPRP机制对特定应用的NFS服务器的I/O带宽提升超过2倍。     

图像直方图不变特征在影像匹配定位中的应用

图像的直方图在影像的亮度及对比度发生变化时,可以保持基本不变.基于此,提出了由图像直方图的不变特征进行影像匹配的算法,使匹配的稳定性提高且大大减少了匹配时间.     

非线性滤波及其在GPS航姿系统中的应用

ＧＰＳ航姿系统中如何快速、可靠地解算出航向姿态,依赖于载波相位模糊度的确定。对于测量噪声较在的接收机或模糊度只有浮点解的情况来说,ｋａｌｍａｎ滤波技术是确定模糊度的有效方法之一,但其滤波需要较长的时间。为了加快滤波的收敛速度,缩短ＧＰＳ航姿系统的初始化过程,文中提出了基于基线长度约束的非线性Ｋａｌｍａｎ滤波方法,并通过实验研究结果证明,该方法是确实可行的。     

一种抗剪切的彩色图像盲水印算法

作为保护信息安全的一种有效手段,数字水印得到了广泛的发展.本文利用小波变换良好的多分辨率表示、时频局部分析等特性,在小波分解第二级的中频,结合考虑HVS特性,最大强度地嵌入水印,实现鲁棒性与不可见性的最佳折衷;在低频,利用奇异值分解,最大奇异值采取自适应量化方法再次嵌入水印,弥补中频嵌入水印的不足.本文提出的算法能根据图像内容作动态调整,同时,实现盲提取.     

一种基于特征块的图像拼接算法

提出一种基于基本特征块的图像拼接算法。该方法先定义边缘特征量,逐点计算各像素点邻域的边缘信息量大小,并采用局部非极大值抑制及阈值法进行排除,最终确定基本特征块;先利用基本特征块的位置信息初步估计模型参数,再提取特征点对模型参数进行修正;最后,对图像进行拼接获得更大视野更高分辨率的拼接图。实验表明,该算法运算量较小,但可保证一定的精确度,具有一定的可行性和适用性。