优势延续：柯尼卡美能DiMAGE Z6数码相机

对于普通用户来说，最理想的长焦机型应该具有小巧的外形，优质的镜头，以及影像防抖系统。影像防抖系统是必需的，因为在大多数使用的时候，用户都不会随身携带脚架，他们或者是在旅游途中用大变焦数码相机拍摄古刹楼阁的精美木雕，或者在人潮中隐秘地抓拍一个个漂亮的倩影，这些时候，携带一个脚架，对于他们来说都是一个大累赘。[编者按]     

AV问答

问：我最近想买一台数码相机，朋友推荐我买松下的数码相机，说是松下的性能较好，采用德国徕卡镜头和具有“防抖”功能，拍摄效果好，我又听到有人说采用徕卡镜头只是一种“商业宣传”，对拍摄效果影响不太大。这种“光学防抖”功能的原理是什么？防抖作用是否显著？徕卡镜头作用是不是也较重要？我看到一种松下的DMC-LS1型数码相机，镜头上只标有LUMIXDC VARIO，不知是不是采用的徕卡镜头？     

日常节目制作中跟踪与稳定的应用

在节目制作中我们经常会遇到画面由于拍摄条件有限或摄像失误造成的画面抖动,而在后期的编辑中又没有可替代的镜头,这时我们通常会用到稳定功能,消除镜头的晃动,使画面保持稳定.而跟踪功能主要适用于特效的处理,跟随画面中的某个物体,附加或处理成特殊效果,跟踪和稳定是我们在影视后期经常要用到的特技,不同之处在于一个作用于画面本身,一个用于附加其它对象,但都会利用于跟踪所得到的运动轨迹.     

索尼HDR－XR520E

240GB硬盘、支持光学防抖 索尼全新硬盘摄像机HDR—XR520E拥有663万像素ExmorRCMOS影像传感器以及“BIONZ”影像处理器，能够在拍摄过程中提供更加精美细节，在拍摄静态照片时更是可达1200万像素。独特的G镜头能够带来低色散、高对比度的画面效果。配合32英寸16：9的92．1万像素触摸式液晶屏，显示效果相当的出众，内置240GB硬盘空间及记忆棒双存储介质，可以拍摄更多精彩时刻。     

意美捷三角架，让我欢喜让我忧

在所有拍摄附件中三角架应该是最重要的一个了,无论是摄影还是摄像都少不了它。用三脚架可以拍到稳定平滑的画面,这是手持拍摄难以达到的,另一方面,作为观者我们往往会把手持拍摄的有些抖动的镜头看成是主观镜头,而使用三脚架稳定拍摄的镜头看成是客观镜头。可见三脚架的作用是非常大的。     

佳能推出户外4K摄控一体机新品CR-X500和CR-X300

CR-X500和CR-X300户外摄控一体机均搭载了DIGIC DV6影像处理器并使用与专业摄像机相同的核心部件。两款设备均支持4K传感器的全高清超采样HD处理技术。此外,CR-X500和CR-X300不仅搭载了标准防抖功能,可实现垂直/水平旋转校正的4轴图像稳定,还配备了更强大的强力防抖功能,具有更强的校正效果,适合在长焦拍摄期间校正较大抖动。CR-X500配备了Canon Log 3和Wide DR伽马曲线,能够实现诸如灰度调整等简单的颜色分级、平滑的缓解色调差并减轻过度曝光。     

用航拍技术实现电影镜头

用航拍技术实现电影手法镜头,这需要我们了解每一种航拍设备的性能,才能更好发挥和实现电影手法的镜头。在电影镜头设计中,是否能拍摄出表达画面情绪的电影镜头主要还是要靠云台手。关于借助航拍飞行器实现电影镜头,以拍摄了几年的心得来浅谈一番,下面所说主要以多轴航拍机为主。     

大眼睛防抖 柯尼卡美能达α-5 Digital数码相机

定位于入门级数码单反市场的柯尼卡美能达（KONICA MINOLTA，以下简称柯美）α-5 Digital（以下简称α-5D）携看家技术——CC防抖系统也出现在摄影爱好者面前。得益于CCD稳定系统，所有安装在α-5D上的柯美镜头都将摇身一变成为光光防抖镜头。如此的诱惑，对于入门级用户来说更是具有极大的吸引力。     

运动影像剪辑介入的路径与美学阐释

运动是影视艺术区别于文学、绘画等艺术门类的生命基因,很多影视段落依此立法,在某种程度上而言,运动已经成为影视的存在方式。运动影像往往是一种复杂结构,剪辑运动影像时经常会遇到这样的情况,一场两分钟的戏,提供的素材有全景、中景、近景、运动镜头、正打、反打等。表现运动的镜头组织往往会因为运动的空间跨度、表演的肢体动作、动作自身的节奏控制,甚至于替身与真身的形象融合等原因,在镜头与镜头相连接的端点处颇费思量。本文将按照运动的剧烈程度和表达诉求,探究动作剪辑的几种创作指向。     

新闻

索尼索尼发布内置5轴防抖系统的微单数码相机α7II 1月27日,索尼（中国）有限公司正式发布了α系列便携全画幅微单数码相机新品α7II（型号名：ILCE-7M2）。α7II在小巧便携的机身中内置5轴防抖系统,最多可补偿约4.5级快门速度的防抖性能,无论是使用索尼丰富的A卡口还是E卡口镜头,均可以实现出色的防抖性能,并可转接第三方镜头。α7II还在诸多细节方面进行了升级,比如提高了约40%的开机速度,提高了约30%的对焦速度,视频方面加入了XAVC S格式的支持,     

Image Reconstruction in a Wide Aspect Ratio HDTV System

One of the important characteristics of a high-definition television (HDTV) image is a wide aspect ratio. In some HDTV systems the image is segmented and different formats are used to transmit portions of the image. We address the problem of image reconstruction at the receiver and present an analysis of a wide aspect ratio HDTV system. Several image reconstruction techniques are described, including a channel-dependent design, and their effectiveness discussed. We also present a channel-independent system for image reconstruction that utilizes a vertical interval test line. Performance has been evaluated, via computer simulation, using still images. The results indicate an imperceptible amount of artifacts at the edge-center joints with an overlap as small as one picture element for the channel-independent reconstruction technique.     

煤矿多媒体图像通信网的设计

本文介绍了一种用于煤矿的包括电视会议、工业电视的图像通信系统，该系统具有本质安全、抗干扰能力强、成本低等特点。     

一种基于KLT-RANSAC全局运动估计的电子稳像算法研究

全局运动估计是电子稳像的核心,很大程度上影响整个稳像系统的性能.提出了一种基于KLT-RANSAC全局运动估计的电子稳像算法,该方法首先通过增加距离约束机制,并进行亚像素级定位,优化Harris特征点,选择KLT快速匹配算法实现特征点的粗匹配,之后引入了RANSAC算法剔除误匹配点,去除视频序列中分布在运动物体上的特征点,避免了局部运动对全局运动估计的影响.实验结果表明:本算法可以有效解决特征点匹配过程中的误匹配问题,避免局部运动对稳像的干扰,快速准确地计算出全局运动参数,最终可以实时处理存在平移和旋转抖动的视频,输出稳定高质量的视频.     

High-definition television systems

Fifteen years ago, in 1970, the NHK (the Japan Broadcasting Corporation) forecast today's information society and started research and development of a high-resolution and wide-screen television system which we now call high-definition television (HDTV) system, to produce a new television system most suitable to the creation of "video culture of the future." Wide ranging studies have been carried out by NHK on the establishment of desirable picture quality, picture aspect, and signal standards for transmission. The provisional HDTV system proposed by NHK based on the result of many studies and the performances of the system are described. Early in 1984, the MUSE system has been developed by NHK and the desirable HDTV information can be compressed with 8 MHz and packed with this system. Thanks to the development of the MUSE system, there is the potential of HDTV broadcasting via satellite and early introduction of HDTV into package media such as video discs and videotapes. The NHK's HDTV system was designed to match many other applications. Many kinds of HDTV equipment have been developed in Japan and HDTV is approached and studied in the relation to various aspects such as electrocinematography, printing, and medicine. NHK has been working on the development of the entire broadcasting system of HDTV to unite the whole world into one "television community" in the coming generation by a worldwide single standard. Video engineers all over the world should be aware of the importance of every possible effort toward the establishment of a global HDTV system.     

我国数字电视发展策略研究

数字电视是指节目摄制、编辑、发送、传输、存储、接收和显示等环节全部采用数字处理的全新电视系统,世界各国都在积极地寻找发展对策.结合我国国情,提出了"一统一、四到位、二丰富"的数字电视发展策略.     

The iconoscope—A modern version of the electric eye

This paper gives a preliminary outline of work with a device which is truly an electric eye, the iconoscope, as a means of viewing a scene for television transmission and similar applications. It required ten years to bring the original idea to its present state of perfection. The iconoscope is a vacuum device with a photo-sensitive surface of a unique type. This photo-sensitive surface is scanned by a cathode ray beam which serves as a type of inertialess commutator. A new principle of operation permits very high output from the device. The sensitivity of the iconoscope, at present, is approximately equal to that of photographic film operating at the speed of a motion picture camera. The resolution of the iconoscope is high, fully adequate for television. The paper describes the theory of the device, its characteristics and mode of operation. In its application to television the iconoscope replaces mechanical scanning equipment and several stages of amplification. The whole system is entirely electrical without a single mechanically moving part. The reception of the image is accomplished by a kinescope or cathode ray receiving tube described in an earlier paper. The tube opens wide possibilities for applications in many fields as an electric eye, which is sensitive not only to the visible spectrum but also to the infra-red and ultra-violet region.     

Obtaining Diversity and Coding Gains for Digital Terrestrial Television by Using a Coded Cooperative MIMO Transmission Scheme

Digital terrestrial television is a modern broadcasting technology that has permitted broadcasters to offer television service with excellent image and sound quality. Many countries have been assigned a new digital television standardization process and many studies are underway regarding digital multimedia broadcasting technology. This paper investigates the utilization of a coded cooperative multiple-input and multiple-output (MIMO) transmission scheme in modern digital broadcasting systems to achieve additional transmit diversity and coding gains. The main idea of this work is the implementation of a coded cooperative MIMO scheme based on a low-density parity check code. A coded cooperative transmission can obtain a robust forward error correction. In this way, it is possible to achieve more stable system performance and improved mobility for next generation handheld systems. In order to show the potential for practical implementation, the performance of the proposed method is evaluated on the basis of the Digital Video Broadcasting-Second Generation Terrestrial (DVB-T2) system. The simulation results show that the proposed scheme can be utilized for the development of future DVB broadcasting systems that should support high mobility handheld devices, such as the Digital Video Broadcasting–Next Generation Handheld (DVB–NGH) system.     

Signal-dependent film grain noise generation using homomorphicadaptive filtering

A technique for the generation of signal-dependent film grain noise is presented. It finds applications in television and motion picture productions where artificial film grain noise is added to computer-generated synthetic images to give them a realistic appearance. After decoupling the signal from the noise, using the generalised homomorphic transformation, the noise is removed from the noisy image using the proposed adaptive filtering scheme. The noise parameter is then estimated using the higher-order statistics (skewness or kurtosis) of the observed image and the filtered image statistics, and it is used to generate film grain noise. Computer simulation results demonstrate the effectiveness of the proposed method     

利用信息共享提高广电收听、收视率及广告创收

大众传播进入网络时代后,我国广播电视现行的"四级办"体制,已暴露出其体制模式的局限性.分级建设使得广播电视事业主要以满足内需为目的,缺乏良好的竞争机制;同时,由于"四级办"电视台各自为政,又导致各台之间出现影视素材占有的严重不足.文中通过从利用建立栏目信息共享数据库,实现了业内互动的媒体市场和广播电视节目收听、收视率、广告创收共赢的目的.同时,对广播电视节目信息共享中出现的问题及解决方案也做了较为全面的分析阐述.