基于镜面高光检测的明暗恢复形状新方法

镜面高光是由明暗恢复形状算法的重大障碍,但是对于单幅灰度图像,因为只包含亮度信息,现有以色度分析和极化分析为基础的高光检测方法均不能适用.为此,提出了一种利用表面形态分布信息检测镜面高光的方法.该方法充分利用成像过程信息,通过对表面法向量的估计,采用模拟退火算法,计算各反射成分的最大后验概率,从而实现高光区域检测,最后,利用基于曲率连续性假设的约束补色方法移除镜面高光.实验结果表明提出的算法在仿真和真实图像的高光检测中均具有较好的检测效果,有效提高了含镜面高光图像的表面恢复精度.     

一种潜艇回波简化亮点模型仿真

采用一种简化亮点模型来实现潜艇回波仿真,构造了一个三亮点的回波模型.从仿真结果看,它与单亮点回波模型相比,能更充分地体现潜艇目标回波脉宽展宽和回波脉冲串特性;与六亮点回波模型相比,形式更简化,意义更明确.同时,简化亮点模型的回波特性与实际潜艇回波相吻合,是一种有效简洁的模型.     

面向足球视频摘要的叙事性拼图算法

利用叙事性拼图优化足球视频摘要的显示,根据精彩事件分析和不同镜头类型的叙事相关性最大化策略抽取候选关键帧,提取不同感兴趣对象为中心定义和重定向感兴趣区域,根据叙事结构中的时-空逻辑构建拼图排列,比随机拼图或故事板能保持更多精彩事件的叙事内容。实验结果显示,叙事性拼图摘要不仅清晰地对精彩事件中的球员动作和人物表情实现了叙事目的,还能在同等显示区域内比故事板描绘更多的叙事内容,也比直接的视频片段快放节约流量,以及节约浏览时间。      

System optimization in digital color imaging

The work presents an overview of a color imaging system and its elements and then highlights techniques in the literature that attempt to account for system interactions for improved quality or performance. After that, presented in greater detail, are two specific examples of approaches that take into account interactions between elements that are normally treated independently. Finally, concluding remarks are presented.     

神经网技术与图像工程

本文综述图像工程中计算的共同特点。基于此,引伸到神经网技术的计算特点。从后者可以满足前者的全部要求来说明何以神经网技术在图像工程中的应用应该得到重视。最后附以在GRABAC系统上得到的实验结果以作示例来说明有关问题。     

数模转换器的正确选择

主要讨论了在选择一个DAC时必须考虑的重点参数，同时介绍了一些新器件所具有的特点。     

The Hybrid Screen—Improving the Breed

The hybrid screen is a halftoning method that generates stochastic dispersed dot textures in highlights and periodic clustered dot textures in midtones. Each tone level is sequentially designed from highlight to midtone by applying an iterative halftoning algorithm such as direct binary search (DBS). By allowing random seeding followed by swap-only DBS in a predefined core region within each microcell, each level can be designed while satisfying the stacking constraint and guaranteeing a smooth transition between levels. This paper describes a complete design process for the hybrid screen, introduces a number of enhancements to the original hybrid screen, and evaluates their impact on print quality. These enhancements include a multilevel screen design based on either extending a bilevel screen or directly generating a multilevel screen on a high resolution grid, and extending the hybrid screen design procedure to color by jointly optimizing the color screens using color DBS. For the multilevel screen, we show that the best choice for the core size critically depends on the bit depth and screen frequency. For the color hybrid screen, we demonstrate a significant improvement in the highlights over halftones generated by independently designed screens.      

Evaluating VoIP Technology — Technology Push/Market Pull

With many raised expectations of what it will offer, voice over IP has enjoyed a high profile in the communications industry. However, in common with any emerging technology, the reality of the functionality that available equipment can deliver is often at variance with such expectations. This paper highlights the role of technology assessment in refining VoIP products and highlights the value of such activities from a number of perspectives. It describes an approach to evaluate VoIP solutions, the problems associated with the testing of VoIP networks and network components, and the tools and techniques employed to do so. The paper also outlines the capabilities of the BTexaCT VoIP technology evaluation test bed, and example case studies of detailed evaluation and testing.     

Temperature-Dependent Total Absorption of Exciton Polaritons in Bulk Semiconductors

Semiconductors - This paper highlights the temperature factor in the experimental study of total absorption as a method for experimental validation and the study of the exciton–polariton...     

Directions for drivers and design

The Design International Technology Working Group for the 2001 International Technology Roadmap for Semiconductors (ITRS) renewal consisted of over 50 international experts. Together, this group developed a new System Drivers chapter in the ITRS, a revised Design chapter, and a number of basic models (clock frequency, layout density, power dissipation, etc.) that define elements of the Overall Roadmap Technology Characteristics (ORTCs). This article excerpts several highlights of these contributions.     

大容量光网络异构互联及控管研究

多种类型的网络设备并存造成光网络严重异构化,且难以实现真正意义上的互联互通,成为阻碍光网络进一步发展的＂瓶颈＂。文章针对大容量光网络异构互联及优化控管问题,对一些相关新技术和研究成果进行介绍,包括集中式与分布式相结合的异构多域大规模光网络广义控管架构、K随机最短路域间路由优化技术、基于＂边缘环＂的多域网络拓扑架构、路由重定向信令技术,以及异构多域光网络试验平台搭建等。     

Hybrid functional microfibers for textile electronics and biosensors

Fibers are low-cost substrates that are abundantly used in our daily lives.This review highlights recent advances in the fabrication and application of multifunctional fibers to achieve fibers with unique functions for specific applications ranging from textile electronics to biomedical applications.By incorporating various nanomaterials such as carbon nanomaterials,metallic nanomaterials,and hydrogel-based biomaterials,the functions of fibers can be precisely engineered.This review also highlights the performance of the functional fibers and electronic materials incorporated with textiles and demonstrates their practical application in pressure/tensile sensors,chemical/biosensors,and drug delivery.Textile technologies in which fibers containing biological factors and cells are formed and assembled into constructions with biomimetic properties have attracted substantial attention in the field of tissue engineering.We also discuss the current limitations of functional textile-based devices and their prospects for use in various future applications.     

Optical spectroscopy vs. the surgical suite [cancer detection]

A novel non-invasive technique for detecting cancer and precancer offers a viable adjunct to biopsies. Here, we summarize the principles of optical spectroscopy and present some of the highlights obtained with the successful application of fluorescence and Raman spectroscopy for cancer and precancer detection     

Complex Susceptibility of Saturated Erbium-Doped Fiber Lasers and Amplifiers

It is shown that the real part of the complex susceptibility of saturated erbium-doped fibers is fully characterized by the gain and a pair of readily determined material parameters. This result highlights an inconsistency in the standard theory, which is readily resolved. Explicit values for the linewidth broadening coefficient, which determines the rate of change of refractive index with gain, are presented for an erbium-doped fiber for the first time, based on theoretical inference from measured gain characteristics     

A high-performance CMOS 32-bit parallel CRC engine

Design highlights for a 32-bit parallel cyclic redundancy check (CRC) generator engine are presented. In a 0.8-μm three-layer-metal CMOS process, the engine could handle about 5 Gbps data throughput. A compact layout is achieved by predecoding eight groups of four bits followed by performing a binary tree reduction on nets that are sorted by fanout. There are six gate delays plus a single-phase clock edge-triggered register     

MTT Awards for 1975

One of the highlights of the 1976 annual MTT Symposium Banquet was the MTT Society Awards for 1975.     

Integration of the IMS/PCC framework into the mobile WiMAX network

This article highlights WiMAX network requirements and functionality for integration with 3GPP Rel 7 IMS/PCC architectures.     

Generating stochastic dispersed and periodic clustered textures using a composite hybrid screen.

In electrophotographic printing, a periodic clustered-dot halftone pattern is preferred for a smooth and stable result. In addition, the screen frequency should be high enough to minimize the visibility of the halftone textures and to ensure good detail rendition. However, at these frequencies, the halftone cell may contain too few pixels to provide a sufficient number of distinct gray levels. This will result in contouring and posterization. The traditional solution is to grow the clusters asynchronously within a repeating block of clusters known as a supercell. The growth of each individual cluster is governed by a microscreen. The order in which the clusters grow within the supercell is determined by a macroscreen. Typically, the macroscreen is a recursive pattern due to Bayer. In highlights and shadows, this ordering results in visible artifacts. Replacing the Bayer screen by a stochastic macroscreen eliminates these artifacts, but results in new artifacts. In this paper, we propose a new composite screen architecture that employs multiple microscreens and multiple macroscreens in the highlights and shadows. These screens are jointly designed by using the direct binary search (DBS) algorithm.     

基于模糊均值聚类和亮度均衡的钢管自适应计数

针对现有计数方法的缺陷,根据钢管截面区域与背景图像存在较大亮度差异的特点,提出了基于模糊C均值(FCM)聚类和亮度均衡的钢管自适应计数方法。用亮度均衡等方法对钢管图像进行预处理,降低图像中高光和阴影等的不良影响;利用FCM聚类方法自适应分割图像;对二值图像进行连通区域标记,获取区域几何特征;利用统计学方法和FCM聚类方法剔除非钢管截面区域,统计计数。实验表明,新方法不仅计数速度快,而且计数精度高,同时具有对不同环境条件的自适应性。     

站点部署的最佳实践方法——蜂窝网络负载分流

分析了服务提供商用于将其Wi-Fi部署从热点便利服务升级至关键的3G/4G负载分流解决方案的最佳实践,以及之前的部署实践,强调了驱使服务提供商采用新解决方案将Wi-Fi部署为蜂窝网络负载分流解决方案的关键制约因素。描述了这些服务提供商是如何提升其Wi-Fi网络部署实践来解决这些问题,以及如何提供高质量解决方案以满足通过Wi-Fi进行蜂窝网络负载分流的需求。