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Adaptive playout control for intra-/inter-client synchronization in multicast media streaming 自适应播放控制内/间客户端同步在多播媒体流
SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.512686
SangHoon Park, JongWon Kim
{"title":"Adaptive playout control for intra-/inter-client synchronization in multicast media streaming","authors":"SangHoon Park, JongWon Kim","doi":"10.1117/12.512686","DOIUrl":"https://doi.org/10.1117/12.512686","url":null,"abstract":"Recently we have proposed a multicast media streaming framework that enhances the media synchronization by employing a server-client coordinated adaptive playout and error control. Focusing on the adaptive playout with time-scale modification, we adopt the adaptive playout to help both intra-client and inter-client synchronization in a multicast streaming environment. However, only the usability of adaptive playout in assisting the synchronized multicast streaming is demonstrated while leaving several detailed issues untouched. As an effort to enhance the proposed framework, in this paper, we concentrate on refining the adaptive playout between two (i.e., intra/inter) synchronization modes. We attempt to enhance each synchronization mode and enable appropriate switching between them. More specifically, we zoom into the tradeoff of adaptive playout for buffer control and playout time control by adopting a dynamic playback factor adjustment. To evaluate the proposed scheme, network simulation and analysis (performed in NS2 simulator over the PIM-SSM multicast network) are conducted. Results show that the proposed scheme can enhance the performance of intra-client as well as inter-client synchronization.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126362293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An advanced OFDM time synchronization scheme 一种先进的OFDM时间同步方案
SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.509426
S. Park, Sammo Cho, Bong-Ho Lee, Y. Hahm, S. Lee
{"title":"An advanced OFDM time synchronization scheme","authors":"S. Park, Sammo Cho, Bong-Ho Lee, Y. Hahm, S. Lee","doi":"10.1117/12.509426","DOIUrl":"https://doi.org/10.1117/12.509426","url":null,"abstract":"We propose an advanced time synchronization scheme with additional pre-processor for OFDM systems. The proposed pre-processor scheme makes symbol synchronization and guard-interval length detection possible, even though there is no guard-interval length information. This pre-processor is so useful in the systems like DVB-T, which have several kinds of guard-interval lengths. Simulation results show that the proposed scheme gives satisfactory performance in the guard-interval length detection and the OFDM symbol synchronization over AWGN.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121903470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Three-dimensional object transmission scheme by use of digital holography and ultrafast optics 利用数字全息和超快光学技术的三维物体传输方案
SPIE ITCom Pub Date : 2003-11-18 DOI: 10.1117/12.515738
O. Matoba, B. Javidi
{"title":"Three-dimensional object transmission scheme by use of digital holography and ultrafast optics","authors":"O. Matoba, B. Javidi","doi":"10.1117/12.515738","DOIUrl":"https://doi.org/10.1117/12.515738","url":null,"abstract":"A three-dimensional (3D) object transmission system by use of digital holography is presented. We can combine holography to detect 3D object information with a pulse shaper based on ultrashort pulses for ultrafast data transmission. A 3D object is sensed by a fast medium using digital holography. Then, the output of this medium is interfaced with an ultrafast optical system. After the data transmission, the information is reconstructed optically in a 3D form using a display device. System configuration and numerical evaluation are presented.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129087634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Three-dimensional optimum nonlinear filter for detecting distorted ladar images in disjoint background noise 三维最优非线性滤波在不相交背景噪声下检测雷达图像畸变
SPIE ITCom Pub Date : 2003-11-18 DOI: 10.1117/12.511243
S. Hong, B. Javidi
{"title":"Three-dimensional optimum nonlinear filter for detecting distorted ladar images in disjoint background noise","authors":"S. Hong, B. Javidi","doi":"10.1117/12.511243","DOIUrl":"https://doi.org/10.1117/12.511243","url":null,"abstract":"We propose an optimum nonlinear filter to detect the target's 3D coordinates within the input 3D scene using LADAR data. The 2D encoded LADAR range image is converted into 3D binary profile, and then the 3D optimum nonlinear filtering technique is used to detect the 3D coordinates of targets including the target distance from the sensor. The 3D optimum nonlinear filter is designed to detect distorted targets, i.e., out-of-plane and in-plane rotations and scale, and to be noise robust. The nonlinear filter is derived to minimize the mean of the output energy due to the disjoint background noise and additive noise and output energy due to the input scene, while maintaining a fixed output peak for the members of the true class target training set. The system is tested using real LADAR imagery in the presence of background clutter. The correlation outputs of LADAR images show dominant peaks at the target 3D coordinates.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129657318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Digital three-dimensional object reconstruction and recognition using integral imaging 利用积分成像技术进行数字三维物体重建与识别
SPIE ITCom Pub Date : 2003-11-18 DOI: 10.1117/12.511367
Y. Frauel, B. Javidi
{"title":"Digital three-dimensional object reconstruction and recognition using integral imaging","authors":"Y. Frauel, B. Javidi","doi":"10.1117/12.511367","DOIUrl":"https://doi.org/10.1117/12.511367","url":null,"abstract":"Integral images contain three-dimensional (3D) information about a scene. We extract this information using a stereo-matching algorithm and we digitally reconstruct the 3D scene in a computer. We then use the reconstructed scene to perform 3D recognition by means of a nonlinear 3D correlation. We demonstrate the recognition and localization of objects in a 3D scene. We also compare discrimination of 2D and 3D correlations.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"94 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131207167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Three-dimensional display with volume/space expansion 具有体积/空间扩展的三维显示
SPIE ITCom Pub Date : 2003-11-18 DOI: 10.1117/12.512482
Masaaki Okamoto, K. Komatsu, Y. Kajiki, E. Shimizu
{"title":"Three-dimensional display with volume/space expansion","authors":"Masaaki Okamoto, K. Komatsu, Y. Kajiki, E. Shimizu","doi":"10.1117/12.512482","DOIUrl":"https://doi.org/10.1117/12.512482","url":null,"abstract":"The authors developed a simple stereoscopic display using the characteristic of inclined polarization of existing LCD panels. The production time of this display is very short and the cost is low price. The screen size of this display becomes about half of the LCD panel. Thus the stereoscopic images are displayed on the slightly small screen. Therefore several distortions often appear as puppet theater effect and cardboard effect. The researchers have not been able to provide the satisfactory solutions to these distortions. The authors propose a geometrical model to describe the relation between the real space of the recording time and the virtual space of the replay time. This model is mainly related to the reduction or the magnification about the screen size and the distance of a pair of cameras. The authors could improve the distortions by considering these conditions. Moreover the authors succeeded in improving 3D images more vividly. The essential point is the construction of multiple layered virtual images. The authors call this complex image \"sur-virtual image.\" In this way the volume of the expressed object and the scale of the virtual space can be easily expanded. The viewer can enjoy more exciting 3D images.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122588397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Intermediate image generation using multiresolution and irregular quadtree decomposition 中间图像生成采用多分辨率和不规则四叉树分解
SPIE ITCom Pub Date : 2003-11-18 DOI: 10.1117/12.510974
Kyung-tae Kim, Y. Arakawa, M. Siegel
{"title":"Intermediate image generation using multiresolution and irregular quadtree decomposition","authors":"Kyung-tae Kim, Y. Arakawa, M. Siegel","doi":"10.1117/12.510974","DOIUrl":"https://doi.org/10.1117/12.510974","url":null,"abstract":"To allow multiple viewers to see the correct perspective and to provide a single viewer with motion parallax cues during head movement, more than two views are needed. Since it is prohibitive to acquire, process, and transmit a continuum of views, it would be preferable to acquire only minimal set of views and to generate intermediate images by using the estimated disparities. For high quality of the generated image, the first, we propose how to generate the intermediate images using multi-resolution and irregular-quadtree decomposition. Irregular-quadtree decomposition is aligned at the object boundary which is the disparity discontinuity. By finding the peak over the absolute values of the high pass filtered output that is applied to the row and column average, the horizontal and vertical dividing locations of the block are computed. The second, regions of occlusion are decided by similarity comparisons among the matched block alternatives, then filled with the pixels of left or right image by the principles we proposed. Finally, the images at arbitrary viewpoints of generated and yielding a 31.1 dB PSNR at middle location between both viewpoints.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125252697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
3D image sensing and reconstruction with time-division multiplexed computational integral imaging (CII) 基于时分复用计算积分成像(CII)的三维图像传感与重建
SPIE ITCom Pub Date : 2003-11-18 DOI: 10.1117/12.515737
A. Stern, B. Javidi
{"title":"3D image sensing and reconstruction with time-division multiplexed computational integral imaging (CII)","authors":"A. Stern, B. Javidi","doi":"10.1117/12.515737","DOIUrl":"https://doi.org/10.1117/12.515737","url":null,"abstract":"We present a method to compute high-resolution three-dimensional (3-D) images based on integral imaging. In order to overcome optical limitation on the spatial resolution of reconstructed 3-D image, we suggest performing time-division multiplexing by which a sequence of II's is captured with a slightly different location of the lenslet array. The II image sequence obtained by the detector array is processed digitally with super-resolution reconstruction algorithms to obtain a reconstructed image, appropriate to a viewing direction, which has a spatial resolution beyond the optical limitation.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122585933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Depth control GRIN lens array for integral photography 用于整体摄影的深度控制GRIN镜头阵列
SPIE ITCom Pub Date : 2003-11-18 DOI: 10.1117/12.510932
F. Okano, Masaki Kobayashi, J. Arai, M. Okui
{"title":"Depth control GRIN lens array for integral photography","authors":"F. Okano, Masaki Kobayashi, J. Arai, M. Okui","doi":"10.1117/12.510932","DOIUrl":"https://doi.org/10.1117/12.510932","url":null,"abstract":"This paper describes a new means to control depth positions of 3-D images for integral photography. A GRIN lens array is set in front of a lens array for image capturing. The length of each elemental GRIN lens composing the array is a half of one period of the optical path. The GRIN lens array also avoids pseudoscopic effects with revised depth. The depth position of the 3-D images is controlled by adjusting the distance between the GRIN lens array and the capturing lens array, thus producing 3-D images without depth distortion.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131899567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Improvement of multiple imaging system used for natural 3D display which generates high-density directional images 用于自然三维显示生成高密度定向图像的多重成像系统的改进
SPIE ITCom Pub Date : 2003-11-18 DOI: 10.1117/12.530123
Y. Takaki, H. Nakanuma
{"title":"Improvement of multiple imaging system used for natural 3D display which generates high-density directional images","authors":"Y. Takaki, H. Nakanuma","doi":"10.1117/12.530123","DOIUrl":"https://doi.org/10.1117/12.530123","url":null,"abstract":"A natural 3D image can be generated by projecting massive 2D images. A number of afocal and telecentric imaging systems are aligned in a modified 2D array and are multiplexed to project a number of 2D images into different horizontal directions. Such multiple imaging system has large aberration. The combination of lenses is used to reduce the aberration of a Fresnel lens which is used as a common lens of the multiple imaging system. Electronic correction is also used to reduce the image distortion. These two methods greatly improve the 3D image quality.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"5243 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131036307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
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