SPIE ITCom最新文献_第8页

Optimum discrete approximation of multidimensional band-limited signals 多维带限信号的最佳离散逼近

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.509845

Y. Kida, T. Kida

{"title":"Optimum discrete approximation of multidimensional band-limited signals","authors":"Y. Kida, T. Kida","doi":"10.1117/12.509845","DOIUrl":"https://doi.org/10.1117/12.509845","url":null,"abstract":"We present a necessary and sufficient condition that a given n-dimensional generalized interpolation approximation minimizes various worst-case measures of error of approximation at the same time among all the approximations, including nonlinear approximation, using the same set of sample values. As a typical example of the optimum approximation satisfying the above necessary and sufficient condition, we present n-dimensional generalitd interpolation approximation using the finite number of sample values. Then, we consider n-dimensional generalized discrete interpolation approximation based on n-dimensional FIR filter banks that uses the finite number of sample values in the approximation of each pixel of image but scan the image over the whole pixels. For this scanning-type discrete approximation, we prove that discrete interpolation functions exist that minimize various measures of error of approximation defined at discrete sample points xp=p, simultaneously, where p are the n-dimensional integer vectors. The presented discrete interpolation functions vanish outside the prescribed domain in the integer-vector space. Hence, these interpolation functions are realized by n-dimensional FIR filters. In this discussion, we prove that there exist continuous interpolation functions with extended band-width that interpolate the above discrete interpolation functions and satisfy the condition called discrete orthogonality. This condition is one of the two conditions that constitute the necessary and sufficient condition presented in this paper. Several discrete approximations are presented that satisfy both the conditions constituting the necessary and sufficient condition presented in this paper. The above discrete interpolation functions have much flexibility in their frequency characteristics if appropriate analysis filters are selected.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"136 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":"122754259","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

XML schema harmonization: design methodology and examples XML模式协调:设计方法和示例

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.510924

Yih-Feng Chen, Xiaoming Sun, C.-C. Jay Kuo

引用次数: 6

MPML-based error-resilient wireless video transmission 基于mpml的容错无线视频传输

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.510921

Xiaoming Sun, C.-C. Jay Kuo

引用次数: 3

Evaluation based on invisible watermarking system 基于不可见水印系统的评价

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.502349

Daoshun Wang, Jinghong Liang, Lei Zhang, Yiqi Dai

引用次数: 3

Watermarking scheme for authentication of compressed image 压缩图像认证的水印方案

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.510574

Tsung-Han Hsieh, Chang-Tsun Li, Shuo Wang

引用次数: 3

Real-time stereo image watermarking using discrete cosine transform and adaptive disparity maps 使用离散余弦变换和自适应视差图的实时立体图像水印

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.511615

Dong-Choon Hwang, Kyung-Hoon Bae, Maeng-Ho Lee, Eun-Soo Kim

{"title":"Real-time stereo image watermarking using discrete cosine transform and adaptive disparity maps","authors":"Dong-Choon Hwang, Kyung-Hoon Bae, Maeng-Ho Lee, Eun-Soo Kim","doi":"10.1117/12.511615","DOIUrl":"https://doi.org/10.1117/12.511615","url":null,"abstract":"In this paper, a real-time stereo image watermarking scheme using discrete cosine transform(DCT) and disparity map is proposed. That is, a watermark image is embedded into the right image of a stereo image pair in the frequency domain through the conventional DCT operation and disparity information between the watermarked right image and the left image is extracted. And then, the disparity data and the left image are simultaneously transmitted to the recipient through the communication channel. At the receiver, the watermarked right image is reconstructed from the received left image and disparity data through the adaptive matching algorithm and a watermark image is finally extracted from this reconstructed right image through the decoding algorithm. From some experiments by using the stereo image pair captured by the CCD camera and a watermark image of English alphabet 'NRL', it is found that the PSNR of the reconstructed right image through the DCT and adaptive matching algorithm improves to 9.3dB by comparing with those of the reconstructed right images through the conventional pixel-based and block-based matching algorithms. At the same time the PSNR of the watermark image extracted from the reconstructed right image also improve to 7.72dB by comparing with those of the others. These experimental results suggest a possibility of practical implementation of a disparity map-based stereo image watermarking scheme.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"59 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":"121929709","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: 29

Memory bank conflict reduction for embedded multimedia applications 嵌入式多媒体应用的内存库冲突减少

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.512037

Qi Zhang, Qing Li, Yunyang Dai, C.-C. Jay Kuo

引用次数: 1

Platform for distributed multimedia environments supporting arbitrarily nested team structures 支持任意嵌套团队结构的分布式多媒体环境平台

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.511190

A. A. Nazari Shirehjini, Hannes Guddat, S. Noll, N. Schiffner

{"title":"Platform for distributed multimedia environments supporting arbitrarily nested team structures","authors":"A. A. Nazari Shirehjini, Hannes Guddat, S. Noll, N. Schiffner","doi":"10.1117/12.511190","DOIUrl":"https://doi.org/10.1117/12.511190","url":null,"abstract":"In this paper a novel platform, HOUCOMTM, for the development of team based distributed collaborative applications is presented. Its implementation within a scenario for distributed cooperative virtual product development, ProViT, will be shown, describing the features and advantages of the presented platform. The specified platform consists of a decentrally organized, dynamic and user-configurable architecture. The main entities within the given platform are Conferences (working groups), Sessions (sub-groups), Users, Components, and Shared Resources. The system provides support of hierarchical Session Management, allowing for arbitrarily nested groups and multi-conferencing. Within the given platform Users can be individuals as well as technical devices, e.g. a streaming framework. The ProViT scenario builds a collaborative environment for interactive distributed VR Design reviews for the mechanical engineering industry. Here several distributed clusters form a working group, allowing individual partners to immersively collaborate on 3D models and supplementary documents and communicate via A/V-streaming. This paper divides into three chapters, first describing the ProViT scenario and deriving its requirements. The subsequent chapter examines the novel concept in general and the features that helped meeting the given project requirements in particular. In the conclusion the authors give an outlook on future extensions and applications of the developed platform.","PeriodicalId":282161,"journal":{"name":"SPIE ITCom","volume":"45 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":"132516755","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

Error-resilient video transmission with multi-hypothesis motion-compensated prediction 基于多假设运动补偿预测的容错视频传输

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.510847

Wei-Ying Kung, Chang-Su Kim, C.-C. Jay Kuo

引用次数: 0

Security analysis of selectively encrypted MPEG-2 streams 选择性加密MPEG-2流的安全性分析

SPIE ITCom Pub Date : 2003-11-19 DOI: 10.1117/12.512635

T. Lookabaugh, D. Sicker, David Keaton, Wangmei Guo, Indrani Vedula

引用次数: 36