Experimental 3-D digital TV studio

The Michelangelo Project at the University of Glasgow has developed an experimental three-dimensional television studio. This uses 24 video cameras and parallel computers to capture moving three-dimensional models of human actors. This allows the capture in real time of the appearance and three-dimensional positions of a human actor. It does this using stereo imaging techniques that have been under development at the University of Glasgow for several years. The development of the studio has thrown up many technical problems which are still to be fully resolved, nonetheless it is already producing convincing animated sequences.     

单机双镜头彩色立体摄象机的研究

本文提出一种新颖的全兼容的广播立体彩色电视技术。该技术以Grasman的色匹配定律和Land的retinex色觉理论为基础,在不改变现有广播电视制式及录制、发射、接收设备,实现全彩色立体电视广播。着重介绍广播立体电视系统中的关键设备——双镜头单机彩色立体电视摄象机。     

OTTTV深度剖析

从OTTTV的概念、发展历程、监管政策和产业链格局、与IPTV的区隔与联系,及其未来的发展机会与挑战等角度深度剖析OTTTV业务本质,从而多角度地呈现出OTTTv的真实全貌,以供业界参考。     

Macroblock Level Bits Allocation for Depth Maps in 3-D Video Coding

For 3-D videos, one commonly used representation method is texture videos plus depth maps for several selected viewpoints, whereas the other viewpoints are synthesized based on the available texture videos and depth maps with the depth-image-based rendering (DIBR) technique. As both the quality of the texture videos and depth maps will affect the quality of the synthesized views, bits allocation for the depth maps become indispensable. The existing bits allocation approaches are either inaccurate or requiring pre-encoding and analyzing in temporal dimension, making them unsuitable for the real-time applications. Motivated by the fact that different regions of the depth maps have different impacts on the synthesized image quality, a real-time macroblock level bits allocation approach is proposed, where different macroblocks of the depth maps are encoded with different quantization parameters and coding modes. As the bits allocation granularity is fine, the R-D performance of the proposed approach outperforms other bits allocation approaches significantly, while no additional pre-encoding delay is caused. Specifically, it can save more than 10% overall bit rate comparing with Morvan’s full search approach, while maintaining the same synthesized view quality.     

关于组合多针图复原物体3D表面形状的研究

光度立体系统很易确定物体表面任意点方向及相对深度，但不能确定绝对深度，为确定绝对深度，本文提出的算法首先利用双目光度立体系统的每个摄象机分别获得一幅针图，并求出左、右两针图内对应区域的视差。然后，经适当组合及精确的匹配，重建３－Ｄ物体表面深度。这一方法对进一步开发３－Ｄ表面深度重建及复原景物结构探索性研究有着十分重要的意义。     

浅谈电视摄像中的景深控制

对标清摄像机与高清摄像机的景深进行了比较分析和计算,给出了景深与摄像机相关参数的依存关系,在实际拍摄中实现了电视画面构图中的景深控制.     

家用3-D电视端到端标准开发的综述

消费者对于近期的3-D放映活动反应非常热烈,这证明了使用者对3-D内容的渴望,3-D似乎注定要成为家庭娱乐产业的下一代杀手级应用。到那时,3-D格式的母版后期处理及发行标准对于其在消费市场的成功推广是极其重要的。     

用于PAL电视信号Y.C分离的新型三维滤波器

本文提出一种用于ＰＡＬ电视信号Ｙ．Ｃ分离的新的三维滤波器的结构。该三维滤波器由一个一维水平滤波器和一个二维垂直－时间滤波器组成。     

An algorithm for 3-D automatic movement detection by means ofstandard TV cameras

An algorithm for the computation of 3-D coordinates (space intersection) of marked points on a moving subject surveyed by a couple of TV cameras is presented herein. It has been designed in order to meet the requirements of routinary analysis in biomechanic laboratories. 3-D geometrical arrangement of the TV cameras (space resection) is obtained by means of a method which is based on an iterative least-squares estimation and requires little time for calibration operations; 3-D coordinates are computed by means of a fast geometrical intersection algorithm. The whole algorithm has been extensively used in different laboratories and results on its reliability and accuracy are reported.     

卫星电视天线馈源TE_(10)波的理论和计算机三维显示

从平面波叠加原理出发，导出与从麦克斯韦方程组出发同样的表达式。且将表达式的三维图用ＢＡＳＩＣ语言编程并显示。     

关于融合多针图确定表面绝对深度的误差分析与研究

本文利用ＢＰＳ系统首先产生景物的一对表面方向图，然后：１．分割表面方向图为与景物内物体对应的孤立区域；２．匹配两针图内对应区域间的视差；３．确定物体的３Ｄ表面绝对深度，最后，着重指出怎样识别以下几种主要误差：（１）表面方向测量误差；（２）重建深度误差；（３）极线与扫描线非平行误差等，并且讨论对这些误差进行定量分析与校正的方法。     

动态检测电视图像三维亮色分离技术的研究

根据电视图像三维谱的结构与特征,对ＩＤＴＶ中所采用的三维亮色分离技术进行了数学分析,并提出一种基于动态检测的自适应三维亮色分离方法,表明它有较高的分离质量。     

3-D/2-D registration by integrating 2-D information in 3-D

In image-guided therapy, high-quality preoperative images serve for planning and simulation, and intraoperatively as "background", onto which models of surgical instruments or radiation beams are projected. The link between a preoperative image and intraoperative physical space of the patient is established by image-to-patient registration. In this paper, we present a novel 3-D/2-D registration method. First, a 3-D image is reconstructed from a few 2-D X-ray images and next, the preoperative 3-D image is brought into the best possible spatial correspondence with the reconstructed image by optimizing a similarity measure (SM). Because the quality of the reconstructed image is generally low, we introduce a novel SM, which is able to cope with low image quality as well as with different imaging modalities. The novel 3-D/2-D registration method has been evaluated and compared to the gradient-based method (GBM) using standardized evaluation methodology and publicly available 3-D computed tomography (CT), 3-D rotational X-ray (3DRX), and magnetic resonance (MR) and 2-D X-ray images of two spine phantoms, for which gold standard registrations were known. For each of the 3DRX, CT, or MR images and each set of X-ray images, 1600 registrations were performed from starting positions, defined as the mean target registration error (mTRE), randomly generated and uniformly distributed in the interval of 0-20 mm around the gold standard. The capture range was defined as the distance from gold standard for which the final TRE was less than 2 mm in at least 95% of all cases. In terms of success rate, as the function of initial misalignment and capture range the proposed method outperformed the GBM. TREs of the novel method and the GBM were approximately the same. For the registration of 3DRX and CT images to X-ray images as few as 2-3 X-ray views were sufficient to obtain approximately 0.4 mm TREs, 7-9 mm capture range, and 80%-90% of successful registrations. To obtain similar results for MR to X-ray registrations, an image, reconstructed from at least 11 X-ray images was required. Reconstructions from more than 11 images had no effect on the registration results.     

Reconstruction of 3-D horizons from 3-D seismic datasets

We propose a method for extracting automatically and simultaneously the quasi-horizontal surfaces in three-dimensional (3-D) seismic data. The proposed algorithm identifies connected sets of points which form surfaces in 3-D space. To improve reliability, this algorithm takes into consideration the relative positions of all horizons, and uses globally self-consistent connectivity criteria which respect the temporal order of horizon creation. The first stage of the algorithm consists of the preliminary estimation of the local direction of each horizon at each point of the 3-D space. The second stage consists of smoothing the signal along the detected layer structure to reduce noise. The last stage consists of the simultaneous building of all 3-D horizons. The output of the processing is a set of 3-D horizons represented by a series of triangulated surfaces.     

Voodoo33500TV

继3dfx发布新一代Voodoo3显示芯片的Voodoo3 3000推出后,3dfx终于推出首度跨越多媒体附加功能之作Voodoo 3 3500 TV。这款配备Voodoo3系列最高阶3500版本显示芯片,以及附加TV Tuner功能的多媒体3D影像卡。其中这个最新版本的Voodoo3 3500显示芯片是Voodoo3家族中性能最强的,不仅速度最快,而且是Voodoo3中唯一支持平面显示器。     

PAL电视信号2D自适应Y-C分离器

正 PAL制电视信号编码采用的是频谱交炽原理,如果仍利用以往的Y-C分离方法就难以达到完善的分离,会在图像上形成Y、C成分间的相互串扰,造成失真以及亮度和色度细节的损失。为了充分挖掘PAL制的潜力,获得高质量的重显图像,研究适合于此制式的、行之有效并易于实现的、新的Y-C分离方式是有实际意义的     

剖析3D 电视

概述了3D显示技术的原理,解释了偏光式和主动快门式3D技术的区别,说明3D电视机的显示原理,介绍了3D电视节目和3D影碟的编码、传输以及播出过程,并给出了常见的3D视频格式的各种拼接方式如左右、上下、交错等,最后简单介绍了能识别3 D视频的HDMI 1．4接口。     

A 4-D Dual-Fan Filter Bank for Depth Filtering in Light Fields

A light field is a four-dimensional (4-D) representation of the light permeating a scene-it parameterizes light rays as a function of position and direction. Such a structure can be measured using a specialized camera and can be used to render novel views of the scene it represents. It has previously been shown that the light field model of a scene may be filtered for a single depth by employing frequency-planar filters. Here, we show how a light field may be selectively filtered for a range of depths by forming a 4-D frequency passband that surrounds the intersection of two 4-D fans. A newly proposed cascaded filter bank is shown to approximate this passband, and its effectiveness is demonstrated on two scenes, both of which contain occlusions. Results are compared with those previously obtained using 4-D frequency-planar filters