我的影院:我的理想影院组合

将玩的乐趣与内心的快乐与满足感觉表达出来。与影音爱好者分享是一件非常有意义的事。伟文先生的影音组合是与众不同的。但正如他所说的：“各人对声音及画质的要求都是很主观的。我认为这样组合能满足我的要求。对应我的品味。比其他贵数倍的器材还要好。那就算别人说什么。又有什么关系呢。”这就是一种个性。一种自信。如果我们每一个人都多一点个性。多一点自信．多一点思考。影音的乐趣同样也在我们身边。     

尊宝AVR690家庭影院放大器

来自丹麦的尊宝(Jamo)。一向以外观造型美观。系列齐全的音箱产品而著称。并率先在业界提出”声音指南”的全新概念。推出为家庭用户提供全套组建家庭音响系统的声音解决方案。利用专门编撰的“声音指南手册”。以直观明了的手法。为不同需求的用户解决在音响搭配过程中遇到的问题。事实上。音响的搭配是一个复杂的系统过程。     

KEF Q1的搭配问题

您好。我是入门的。经济实力也有限。听音面积20平米。喜欢蔡琴、王菲、许冠杰。不喜欢劲歌热舞。对爆棚低音也不是很感冒。个人比较欣赏KEFQ1。因为水平低，对摆位什么的没研究。据评论．KEFQ1的皇帝位很宽。摆位容易，整体音响异常和谐融汇。音乐是整体性的，很有一种浑然天成的音乐气氛。气度温顺。所以我想选Q1，那我想问问。2000元以内的功放哪款推Q1最适合我的要求?2000元左右的CD机选那款呢?马兰士4000怎么样?另外还有平价的线材请推荐。     

PHILIPS DVDR 615刻录机

功能强大的DVD刻录机过去由于价格高。使用不方便，给人以浓厚的专业色彩。回头看一下中国的碟机市场，LD还未在中国普及．一场VCD风暴却已前所未见地掀起。DVD机的登场也是走出了一波步步高升的行情。但DVD刻录机的的市场命运却大不一样．从推出至今已经多年了。却仍然只有有限的消费群体。除了多年的格式之争外，相信最大的障碍就是价格了。当然还有就是便利性了。随着DVD刻录机的多年发展。现在已经到了广泛进入中国家庭的时候。使用多年的传统磁带录像机也该是淘汰的时候了。原因很简单。格式之争已经基本集中在DVD-R／RW及DVD+R／RW上。经PHILIPS DVD刻录机刻录的DVD+R／RW碟片都可以在任何DVD机或个人电脑中播放。绝无播放兼容性问题。价格下调相信是最大的驱动力了。整机价格由去年的9000元左右。下降到现时的3000多元。作为消耗品的刻录碟也有所下调。其价格下降之快着实令人吃惊。价格的金字塔效应是非常明显的。价格越低。消费者自然就越多。至于使用的便利性。同传统磁带录像机相比。已经有过之而无不及了。作为DVD刻录机的消费者。他们购买DVD刻录机的目的就是要用上他的刻录功能。那么现在市场上是否有一款易用．实用、简单．便宜、性能有保证的DVD刻录机呢?回答是有。它就是PHILIPS的DVDR 615。     

低矮空间的双功能私人娱乐系统

上两期的案例聚焦。笔者报道了安桥香港的视听室。本期的案例聚焦。笔者来到了美丽的西湖河畔。去杭州一位发烧友的家中一探究竟，这个由四维音乐工程设计倾情打造的私人高端娱乐系统的工程。于去年年末竣工。     

收视价值的迷失 高端人群在远离卫视 2008目睹中国电视之怪现状

近两个月来,本刊网站的论坛里又不太安静。有个叫"高清迷"的香港网友遭到了广东一些网友的质疑。彼此论战的焦点大部分在说香港电视好看或不好看。"高清迷"网友说大陆电视越来越好,水平已经超过香港的电视节目。广东网友们则是缅怀香港电视的辉煌历史。这原本是简单的我说你好你说我好,互相捧场的事情,但是网络的奇妙性在于事情并没有朝积极的方向发展,其结果是吵架不可避免的发生了。外来的和尚是不是会念经,我们先不去管他。重要的是我们要弄清楚自己是怎么回事。本文,是专业电视人对我国各省卫视台做的调查评估。让我们了解一下我国的电视台的现状吧。     

风度端凝 赋性灵慧——辉阳大地128音箱赏析

我一直在思考一个问题：我国的扬声器及相关部件的生产厂家数以千计。是目前全球扬声器产量的第一大国。也是出口第一大国。但长久以来。我们在高档扬声器领域．一直缺乏可以与国外知名品牌抗衡的制作。虽然我们在不断努力，但离国外最优秀的产品终有不短的距离．以公平．公正．客观的态度去分析，会是什么原因呢?如果能够找出一些原因，并通过努力。去解决一些问题。也许我们的扬声器会有突破．会有飞跃。更会得到公认的评价与肯定。可喜的是。近年。随着无数电声设计师的努力，随     

BONA DVI、HDMI线材

时尚小巧的迷你音响产品越来越受到青少年消费者的青睐。松下近日推出的SC-PM6，就是这样一款具有超紧凑式外形，功能也充实实用的CD微型组合音响。它的主机重量仅有3．9公斤，一对音箱的重量也不过3．2公斤。方便随意放置在家中的任何角落。这款机器最具特色是具有方便使用的学习功能。在收听原声的同时，通过MIC跟读或将发音与原声录制到磁带上，使发音与原声进行真实对照。从而提高发音水平。此外，SC-Ph16采用全新超薄CD机芯。吸入式的录放卡座系统。FM／AM数码调谐器可各预设15个电台。产品小巧可人，功能实用。     

你的笔记本电脑够安全吗？

随着笔记本电脑价格的下降。已经有越来越多的人开始关注和购买它。从国外市场的经验来看。笔记本电脑也将会替代PC成为未来个人电脑市场的主流。与台式PC相比。笔记本电脑拥有很多的优势。如外形小巧、便于携带，噪音小等。当然由于可以脱离电源线的困扰。也就实现了移动使用。而在很多时候，笔记本电脑更是成为了用户的一个私人物品，里面会有很多只属于自己的东西．当然你也不希望其他人看到或者得到它们。     

飞利浦：“精于心、简于形”的品牌战略

家用投影机的销售方式是一个困难的课题。因为顾客需要通过亲身的体验才能够了解产品。从而做出决定。而普通的销售渠道是无法创造出一个能够打动人的接近家庭的视听环境的。富可视在进入中国市场后。以高档家电定位。重点采用了音响行业的渠道来销售。他们营造出专业的视听体验环境。并取得了不错的业绩。     

三色激光散斑自相关法测量表面粗糙度的分析

为研究表面弯曲对利用多色散斑测量表面粗糙度的影响,引入表面曲率半径,通过模拟粗糙表面以及其形成的多色散斑场,讨论了不同曲率半径的粗糙曲面对模拟散斑场和散斑延长率的影响.结果表明,引入粗糙表面的曲率半径,对三色激光散斑自相关测量法是可行的.粗糙表面曲率半径越大,其模拟的散斑场和计算的散斑延长率与平直的粗糙表面越接近.曲率...     

Boundary enhancement and speckle reduction for ultrasound images via salient structure extraction

In this paper, we present an approach for medical ultrasound (US) image enhancement. It is based on a novel perceptual saliency measure which favors smooth, long curves with constant curvature. The perceptual salient boundaries of tissues in US images are enhanced by computing the saliency of directional vectors in the image space, via a local searching algorithm. Our measure is generally determined by curvature changes, intensity gradient and the interaction of neighboring vectors. To restrain speckle noise during the enhancement process, an adaptive speckle suspension term is also combined into the proposed saliency measure. The results obtained on both simulated images and medical US data reveal superior performance of the novel approach over a number of commonly used speckle filters. Applications of US image segmentation show that although the proposed algorithm cannot remove the speckle noise completely and may discard weak anatomical structures in some case, it still provides a considerable gain to US image processing for computer-aided diagnosis.     

Speckle reduction in multipolarization, multifrequency SAR imagery

An algorithm to take advantage of this polarization diversity to suppress the speckle effect with much less resolution broadening than using spatial filtering is discussed. The coupling between polarization channels is minimized by using local intensity ratios. The degree of speckle reduction is similar to two-look or three-look processing. The same algorithm can also be used to process multifrequency polarimetric SAR. For three-frequency aircraft SAR data speckle reduction equivalent to six-look processing can be achieved. Further speckle reduction is possible by applying speckle filters in the spatial domain. In addition, a vector speckle filter which operates simultaneously in the polarization and spatial domains is tested. Experimental results with simulated polarimetric SAR as well as one-look and multilook parametric SAR data demonstrate the effectiveness of these speckle reductions, with minimum resolution broadening and coupling between polarimetric and frequency channels. Comparisons with other algorithms are also made     

基于子孔径波前振幅调制的斜率和曲率信号提取算法

斜率和曲率混合型波前传感技术将子孔径内波前的一阶和二阶导数信息全部利用起来,能够实现高阶像差的精密测量,是区域型波前传感技术的一个重要发展方向。在利用子孔径波前振幅调制的斜率和曲率混合型波前传感器的基础上,提出了一种基于质心探测的斜率和曲率信号提取算法,实现各个子孔径内待测波前斜率、拉普拉斯曲率以及扭转曲率的直接测量。仿真结果表明,在理想条件下,单一子孔径内斜率和曲率信号的检测精度均在0.02（=632.8 nm）以内;噪声水平小于10%时,斜率和曲率信号的检测精度均在0.08以内。该算法具有较高的检测精度及良好的抗噪性。     

激光散斑光强分布的阈化处理及其对功率谱的影响

给出了一种阈化处理激光散斑光强多灰度值分布（如２５６级灰度）的方法。采用此种处理方法，激光散斑的功率谱强度随空间频率的分布保持不变，而计算机存贮散斑图样所需的存贮空间可极大地减少。针对具体的圆形和环形散射屏引入的散斑图样，采取使处理前后的功率谱偏差最小的方法，找出了最佳的阈值。     

基于Nakagami分布的自适应斑点抑制与边缘增强方法

超声图像中的特殊斑点噪声严重影响了图像质量,针对此问题提出了一种基于Nakagami分布的自适应斑点抑制与边缘增强方法.根据斑点噪声的Nakagami分布模型,设计一个基于斑点局部统计特性的自适应滤波器.并应用"窄条"技术以不同方向与长度的"窄条"来近似图像的局部线性特性,滤波区域采用"窄条"代替常用的方形窗口,其中"窄条"的方向由假设试验优化方法确定,"窄条"长度与斑点的局部统计特性相关.实验证明,该方法在抑制斑点噪声、保留与增强图像边缘和细节方面均具有良好的性能.     

Mean curvature mapping for detection of corneal shape abnormality

Corneal topography is used to measure the anterior surface of the cornea. It is conventionally represented as radial slope, radial curvature, and elevation. In this paper, we introduce the application of mean curvature mapping as an alternative representation of the corneal topography. The purpose is to improve the detection of keratoconus and other diseases characterized by local increase in corneal curvature. Both simulated keratoconic cornea and real keratoconus data exported from the corneal topography system were analyzed. Four representations of corneal topography were generated and compared. It was found that mean curvature mapping provided the most precise cone location in simulated keratoconus. In both actual and simulated keratoconus cases, the appearance of the cone-like distortion is more consistent on mean curvature maps. Mean curvature mapping may improve the detection and localization of corneal shape abnormalities.     

激光散斑图自动读出技术的研究

本文介绍一台用于逐点分析法数据处理的条纹数据自动读出仪的原理以及应用该仪器进行应变分析实验的实例和误差分析。该仪器为激光散斑技术的应用提供了方便。     

Real-time speckle reduction and coherence enhancement in ultrasound imaging via nonlinear anisotropic diffusion

This paper presents a novel approach for speckle reduction and coherence enhancement of ultrasound images based on nonlinear coherent diffusion (NCD) model. The proposed NCD model combines three different models. According to speckle extent and image anisotropy, the NCD model changes progressively from isotropic diffusion through anisotropic coherent diffusion to, finally, mean curvature motion. This structure maximally low-pass filters those parts of the image that correspond to fully developed speckle, while substantially preserving information associated with resolved-object structures. The proposed implementation algorithm utilizes an efficient discretization scheme that allows for real-time implementation on commercial systems. The theory and implementation of the new technique are presented and verified using phantom and clinical ultrasound images. In addition, the results from previous techniques are compared with the new method to demonstrate its performance.     

Speckle Noise Evaluation and Reduction of an Edge-Lit Backlight System Utilizing Laser Diodes and an Optical Fiber

Laser diodes allow one to build a very thin, wide-gamut edge-lit backlight system for a direct-view liquid crystal display. An optical fiber is used to transfer its optical power into a light-guide. An ultrasound transmitter attached to the optical fiber is effective for reducing speckle noise because the mechanical vibration introduced averages out the random interference patterns. In experiment, we built a backlight system with a green laser and evaluated speckle noise by taking photographs under the conditions that mimicked human observation. The speckle contrast intrinsic to the laser was reduced from 17% to 2% by turning on the ultrasound transmitter.