Unsupervised texture segmentation using Gabor filters

This paper presents a texture segmentation algorithm inspired by the multi-channel filtering theory for visual information processing in the early stages of human visual system. The channels are characterized by a bank of Gabor filters that nearly uniformly covers the spatial-frequency domain, and a systematic filter selection scheme is proposed, which is based on reconstruction of the input image from the filtered images. Texture features are obtained by subjecting each (selected) filtered image to a nonlinear transformation and computing a measure of “energy” in a window around each pixel. A square-error clustering algorithm is then used to integrate the feature images and produce a segmentation. A simple procedure to incorporate spatial information in the clustering process is proposed. A relative index is used to estimate the “true” number of texture categories.     

单元探测器的短波红外多通道成像技术

为了克服目前利用短波红外焦平面器件获取图像时难以消除器件自身的非均匀性、难以获得较高信噪比及成本昂贵的问题,提出了利用单元探测器和DMD(Digital Micro-mirror Device)空间光调制器件,基于Hadamard变换进行凝视光学画幅式成像的方法.通过实验验证了该方法用于短波红外成像的可行性.对实现低成本、高信噪比的短波红外成像具有借鉴意义.     

波分复用系统中的偏振模散补偿研究

本文阐述了波分复用(WDM)系统进行偏振模散(PMD)补偿的背景和理论基础,首次通过考虑偏振主态(PSP)带宽所能容纳的信道数目提出了两种基于已有单信道补偿方案的满足特定条件的WDM系统中的PMD补偿方案。     

XXX爆炸威力场远距离多参数数据采集系统

针对当前爆炸场测量中存在测试系统布设不便、存储测试系统数据需要回收的问题,综合运用数据采集技术、存储测试技术与无线和光纤通信技术,设计了一种用于爆炸场的远距离多参数数据采集系统。该系统是用来测试XXX爆炸威力场中压力、振动加速度、温度和爆炸时刻的多参数数据专用系统。该系统主要由ZigBee和光纤模块对多个传感器节点进行参数设置(量程设置、采样频率设置、触发电平设置等),使用FPGA和AVR单片机为主控芯片,解决了特殊环境中多通道变参数数据采集问题。实际测试表明:这种新型测试系统可以得到爆炸场中多个参数的变化曲线,具有可无线遥控、微功耗、抗高冲击、抗干扰、工作稳定可靠等特点,适于恶劣环境下数据记录和传输。     

Enabling customers engagement and collaboration for small and medium-sized enterprises in ubiquitous multi-channel ecosystems

Over the last few years, we have encountered an exponential growth in online communication opportunities. Organizations have more and more ways to connect and engage with their current or future customers. The existence of more opportunities in connecting to people can be both an enabler and a burden. Being present at a multitude of different channels requires the effective management of a very large number of adapted contents, formats, and interaction patterns fulfilling the communication and cooperation needs of distributed target groups. In this respect, we integrate existing fragmented communication and monitoring approaches into a full-fledged communication model as a basis for an adequate engagement approach. We describe applications of our approach in both the eTourism and manufacturing domain. In this paper, we introduce an approach that will enable communication, collaboration and value exchange of users through a multitude of online interaction possibilities based on the use of semantic technology. Finally, we also compare our approach with existing solutions with respect to the identified challenges in this subject.     

多通道相位差可调正弦波信号发生器的设计

在实验基础上提出了一种多通道正弦波信号发生器的设计模型，此信号发生器产生的信号频率和各通道相位差可根据实际需要进行调整，在信号测试等方面具有广泛用途，另外结合实例给出了系统各部分的硬件原理图、波形误差分析以及实验结果。     

基于ARM和UC/OS-Ⅱ的多通道智能仪表设计

基于嵌入式系统的应用研究已成为新的热点。本文设计的一款以ARM为微处理器和CPLD为核心的多通道嵌入式仪表,运用液晶图形化显示技术,大容量信息存储和管理技术,测量和控制数据处理技术,网络通信技术等,结合工业过程控制的实际需要,移植了UC/OS-II实时操作系统,实现了仪表的智能化、信息化及网络化,完成了多通道多参数的测控。     

分离HPE1413C多通道采集结果的实现方法

本文讨论两种分离HPE1413C多通道测量结果的方法，分别采用HPVEE和C语言编程实现。将各个通道的数据分离出来，并存放到以其通道名为文件名的文件中，作为后期处理的数据输入文件。     

OLAN光纤微机局域网的总体设计

本文提出了一种适合于特殊环境使用的光纤局域网的拓扑结构——类星型结构。这种结构解决了多通道的同时传输问题。此外,文中还对 OLAN 网的层次划分和各层的协议进行了分析和讨论。     

方位多通道合成孔径雷达数据重建方法

多通道合成孔径雷达可以突破传统SAR不能同时实现高分辨宽测绘带的限制,是SAR发展的必然趋势,在成像处理时,它必须重建方位均匀采样数据。该文提出了一种基于降升调频斜率技术的处理方法,利用线性调频信号特性对方位非均匀数据进行解线性调频处理,然后采用升采样参考函数进行逆解线性调频处理,即完成方位数据的均匀重建。文中给出了信号处理流程,并与重建滤波器组法进行了比较。仿真结果证明了理论分析的正确性。