复杂背景下的人脸分割

针对复杂背景下人脸位置的不确定性和人脸轮廓边缘点的不连续性,本文提出一种新的人脸分割算法,能够在复杂背景下将人脸快速分割出来。本文算法包括三部分:首先设计了特征与模板相结合的人脸定位算法,在复杂背景中以双眼和嘴的坐标为基准确定人脸位置;其次,设计了自适应搜索算法,提取真正的人脸轮廓点,去除“假”轮廓点;最后利用人脸轮廓的平滑性通过曲线拟合来补充不确定轮廓点,完成人脸分割。本文算法综合利用了人脸的肤色、表面结构、轮廓边缘以及轮廓的平滑性等特征完成人脸分割,实验结果证明了算法的有效性。     

Improving the electrical and mechanical behavior of electrically conductive paint by partial replacement of silver by carbon black

Partial replacement of silver particles by carbon black (low cost) in electrically conductive paint was found to decrease the electrical resistivity and increase the scratch resistance of the resulting thick film, which is for use in electrical interconnections. An effective carbon black content is 0.055 of the total filler volume. By using a total solid volume fraction of 0.1969 and a silane-propanol (1:1 by weight) solution as the vehicle, a paint that gives a thick film with resistivity 2 × 10⁻³ Ω·cm has been attained.     

现代战争中的电子干扰和反干扰技术

介绍现代战争中的电子干扰和反干扰技术、提高干扰与抗干扰能力的相关新技术措施,以及国内外现有的新电子干扰设备,描述电子对抗的发展趋势,同时也指出了仍存在的一些问题.     

General expression for pdf of a sum of independent exponential random variables

In order to evaluate exactly the performance of some diversity schemes, the probability density function (pdf) of a sum of independent exponential random variables (r.v.'s) must be known. This paper proposes a simple method to find it by using characteristic function., The resultant pdf is successfully applied to formulate the closed-form BER expression of 2 Tx-J Rx transmit diversity as well as the outage probability of repetition coding.     

有机高分子聚合物LPPP异质结构微腔调谐器可靠性的研究

研究表明有机半导体微腔效应可通过简单地调节有机发光层的厚度来实现。实验结果还指出,由空穴传输型的ＬＰＰＰ和电子转移型掺杂的Ａｌｑ构成的异质结构的微腔器能极大地改进其可靠性。同时用金刚石电极代替金属电极也能提高有机发光器件的稳定性。     

Weighted 3D GS Algorithm for Image-Qquality Improvement of Multi-Plane Holographic Display

Theoretically,three-dimensional(3D) GS algorithm can realize 3D displays;however,correlation of the output image is restricted because of the interaction among multiple planes,thus failing to meet the image-quality requirements in practical applications.We introduce the weight factors and propose the weighted 3D GS algorithm,which can realize selective control of the correlation of multi-plane display based on the traditional 3D GS algorithm.Improvement in image quality is accomplished by the selection of appropriate weight factors.     

基于计算全息的双随机相位图像加密技术

基于计算全息,结合4f系统双随机相位图像加密技术,提出了一种图像加密以及传输的新方法。分析了计算全息(CGH)记录图像独具的扩频效应及特有的解密密钥,并实现了针对全息图不同的频谱单元及组合,采用原相位板、共轭板以及两者的有序组合作为解密密钥的计算机模拟,研究了其抗噪性能,新方法提高了图像加密的安全性。     

Implementation of Lawful Interception Within IMS

Lawful Interception (LI) is a system which monitors a user or a communication in support of criminal investigation. It is a necessary function of the telecommunication operator. The telecommunication standards bodies such as ETSI, 3GPP are producing technical specifications on LI system, and have developed standards on handover areas and interception areas which can guide the implement. IP Multimedia Subsystem (IMS) is a new core-network architecture introduced after the version of 3GPP Release 5, which is layer-designed, IP-based, and using Session Initiation Protocol (SIP) as application protocol. There are two typical implementations of LI within IMS, distributed type and centralized type.     

PLC在工业自动化中的应用

伴随着计算机技术及电子技术的发展,PLC技术在近些年来得到了快速的发展。在工业自动化控制中,PLC取代了传统的继电器控制系统。在本文中首先对PLC进行整体介绍,随后分析PLC在工业自动化控制的应用状况,最后针对PLC的快速发展,讨论其在工业自动化控制的未来发展趋势。     

基于CC2530的无线温度采集系统设计

针对传统温度采集系统存在的便携性差、准确率低、测温电路复杂等问题,文章提出了基于CC2530的无线温度采集系统设计方案。该方案选用ADT7301芯片作为温度采集模块,选用CC2530作为主控芯片实现模块控制、无线数据传输的功能。实验结果表明:该系统能够实现温度信息的实时采集和无线传输,具有体积小、精度高、易组装等优点。