Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026686
R. Lancini, M. Fumagalli, E. Arsura
This paper proposes and implements a system to transmit in real-time slow video signals over the public network. The proposed codec is based on a multiple description approach whose advantage is an intrinsic robustness to the packet losses, as the simulation results have proved. This coding approach is important also for end user scalability since each device can decide the information to receive according to the display resolution and the connecting link bandwidth. The proposed system results are very suitable not only for IP networks but also for every packet network like the next generation mobile systems.
{"title":"Scalable and robust videoconference codec","authors":"R. Lancini, M. Fumagalli, E. Arsura","doi":"10.1109/VIPROM.2002.1026686","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026686","url":null,"abstract":"This paper proposes and implements a system to transmit in real-time slow video signals over the public network. The proposed codec is based on a multiple description approach whose advantage is an intrinsic robustness to the packet losses, as the simulation results have proved. This coding approach is important also for end user scalability since each device can decide the information to receive according to the display resolution and the connecting link bandwidth. The proposed system results are very suitable not only for IP networks but also for every packet network like the next generation mobile systems.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129599114","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026651
C. Popescu
A group signature scheme allowed a group member to sign messages anonymously on behalf of the group. Fingerprinting schemes enable a merchant to identify the buyer of an illegally distributed digital good by providing each buyer with a slightly different version. An anonymous fingerprinting scheme allows the buyer to purchase goods without revealing her identity to the merchant. We propose an efficient anonymous fingerprinting scheme that uses group signature schemes.
{"title":"Applications of group signatures to anonymous fingerprinting schemes","authors":"C. Popescu","doi":"10.1109/VIPROM.2002.1026651","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026651","url":null,"abstract":"A group signature scheme allowed a group member to sign messages anonymously on behalf of the group. Fingerprinting schemes enable a merchant to identify the buyer of an illegally distributed digital good by providing each buyer with a slightly different version. An anonymous fingerprinting scheme allows the buyer to purchase goods without revealing her identity to the merchant. We propose an efficient anonymous fingerprinting scheme that uses group signature schemes.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126888715","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026625
V. Alves, J. Neves, M. Maia, L. Nelas
As more health-care providers invest on computerised medical records, more clinical data is made accessible, and more clinical insights will become reliable. As data collection technologies advance, a plethora of data is available in almost all domains of one's life, being of particular interest to this work that of medicine. An area of particular interest is that of medical diagnosis based systems for computer tomography.
{"title":"Medical image processing using extended logic programming and artificial neural networks","authors":"V. Alves, J. Neves, M. Maia, L. Nelas","doi":"10.1109/VIPROM.2002.1026625","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026625","url":null,"abstract":"As more health-care providers invest on computerised medical records, more clinical data is made accessible, and more clinical insights will become reliable. As data collection technologies advance, a plethora of data is available in almost all domains of one's life, being of particular interest to this work that of medicine. An area of particular interest is that of medical diagnosis based systems for computer tomography.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122378328","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026684
E. Cooke, P. Kauff, O. Schreer
An important aim of immersive teleconferencing systems is to create realistic 3D virtual views of remote conferees. Hence, systems should be able to deal with hand gestures as well as occluded areas in reference images required in derived views. The quality of such derived views is dependent not only on the analysis and synthesis process but also the multiview camera set-up. Often the popular convergent wide-baseline stereo approach aspires to achieve too much through a single camera pair: maximum information and reliable disparity maps. We identify how this dichotomy leads to problems in the analysis and synthesis process, often leading to a restrictive system specific solution. We then define a new approach, a multiple narrow-baseline set-up, designed to overcome the limitations of the wide-baseline set-up, being modular, both in terms of system requirements as well as algorithmically, and scalable, with respect to the number of conferees.
{"title":"Multiple narrow-baseline system for immersive teleconferencing","authors":"E. Cooke, P. Kauff, O. Schreer","doi":"10.1109/VIPROM.2002.1026684","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026684","url":null,"abstract":"An important aim of immersive teleconferencing systems is to create realistic 3D virtual views of remote conferees. Hence, systems should be able to deal with hand gestures as well as occluded areas in reference images required in derived views. The quality of such derived views is dependent not only on the analysis and synthesis process but also the multiview camera set-up. Often the popular convergent wide-baseline stereo approach aspires to achieve too much through a single camera pair: maximum information and reliable disparity maps. We identify how this dichotomy leads to problems in the analysis and synthesis process, often leading to a restrictive system specific solution. We then define a new approach, a multiple narrow-baseline set-up, designed to overcome the limitations of the wide-baseline set-up, being modular, both in terms of system requirements as well as algorithmically, and scalable, with respect to the number of conferees.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131141732","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026691
T. Kratochvil, V. Rícný
The contribution deals with the simulation of non-compressed digital image transmission by a model of the digital transmission channel in baseband. The transmitted digital image corresponds to the CCIR ITU R-601 recommendation that is set up as a standard in digital video broadcasting baseband image processing. The channel is modelled as a digital filter with variable parameters and type of the channel. The whole simulation is aimed at the research and education area of the digital television signal transmission in baseband and quantification and evaluation of the distortions that may have influence on the transmitted digital signal in the digital television technique according to the standard DVB in the spatial, time and frequency domain.
这篇论文讨论了用基带数字传输信道模型模拟非压缩数字图像的传输。传输的数字图像符合CCIR ITU R-601建议，该建议是作为数字视频广播基带图像处理标准而建立的。该通道被建模为具有可变参数和通道类型的数字滤波器。整个仿真是针对数字电视信号在基带传输的研究和教学领域，以及根据标准DVB在空间、时间和频域对数字电视技术中可能对传输的数字信号产生影响的失真进行量化和评估。
{"title":"The digital image transmission simulation by the model of the digital transmission channel","authors":"T. Kratochvil, V. Rícný","doi":"10.1109/VIPROM.2002.1026691","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026691","url":null,"abstract":"The contribution deals with the simulation of non-compressed digital image transmission by a model of the digital transmission channel in baseband. The transmitted digital image corresponds to the CCIR ITU R-601 recommendation that is set up as a standard in digital video broadcasting baseband image processing. The channel is modelled as a digital filter with variable parameters and type of the channel. The whole simulation is aimed at the research and education area of the digital television signal transmission in baseband and quantification and evaluation of the distortions that may have influence on the transmitted digital signal in the digital television technique according to the standard DVB in the spatial, time and frequency domain.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133531218","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026630
E. Izquierdo
Disparity estimation is the basis for the generation of a virtual view from a small set of real reference images. Much research on this area has been conducted by the computer vision community over the last decade. Currently, most problems involved in this technology are well understood and there exist several well-established algorithms to render virtual views from perspectively different images of the same scene. However, most work has been oriented towards high-accuracy disparity estimation to produce high-quality virtual images, often using sophisticated purpose-built hardware accelerators to achieve real-time results. Two disparity estimators with different complexity degrees are described and used to examine how much disparity inaccuracies influence image rendering quality. The objective of this study is to design software-based image synthesis in real-time on conventional PC platforms. Basically, this work looks at the opposite end of the cost-complexity curve by making very restrained demands on the disparity estimator. It is shown empirically that in many cases the effect of disparity accuracy on the quality of virtual views is almost imperceptible and that, for many applications requiring real-time processing, reasonably good results can be achieved with less computational cost.
{"title":"How accurate should be disparities estimated for image-based rendering?","authors":"E. Izquierdo","doi":"10.1109/VIPROM.2002.1026630","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026630","url":null,"abstract":"Disparity estimation is the basis for the generation of a virtual view from a small set of real reference images. Much research on this area has been conducted by the computer vision community over the last decade. Currently, most problems involved in this technology are well understood and there exist several well-established algorithms to render virtual views from perspectively different images of the same scene. However, most work has been oriented towards high-accuracy disparity estimation to produce high-quality virtual images, often using sophisticated purpose-built hardware accelerators to achieve real-time results. Two disparity estimators with different complexity degrees are described and used to examine how much disparity inaccuracies influence image rendering quality. The objective of this study is to design software-based image synthesis in real-time on conventional PC platforms. Basically, this work looks at the opposite end of the cost-complexity curve by making very restrained demands on the disparity estimator. It is shown empirically that in many cases the effect of disparity accuracy on the quality of virtual views is almost imperceptible and that, for many applications requiring real-time processing, reasonably good results can be achieved with less computational cost.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"245 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134012093","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026619
P. Podhradský, E. Mikóczy
This paper describes a multimedia service, E-Learning & Consulting, which exploits integration between INs and IP-based networks. The first section introduces a theme of convergence of telecom and data networks. The second section presents current technology and services based on converged technology. The last and the most important part illustrates a basic fact about our multimedia service, E-Learning & Consulting (E-L&C), solution.
{"title":"The E-Learning & Consulting service based on the converged IN and IP networks","authors":"P. Podhradský, E. Mikóczy","doi":"10.1109/VIPROM.2002.1026619","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026619","url":null,"abstract":"This paper describes a multimedia service, E-Learning & Consulting, which exploits integration between INs and IP-based networks. The first section introduces a theme of convergence of telecom and data networks. The second section presents current technology and services based on converged technology. The last and the most important part illustrates a basic fact about our multimedia service, E-Learning & Consulting (E-L&C), solution.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133636415","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026641
G. Kovács, I. Kas
Some preliminary results of a "Digital Motion Picture Restoration System For Archives" (DIMORF) project are discussed. In this project a great amount of image and sound processing problems are solved and the results applied. The goal is to develop a system and a workstation for complete, high-resolution digital restoration of motion pictures specifically for the Hungarian National Film Archive. The system will correct the errors of image and sound as well. We plan to correct films, where the film material and volume of the sound (especially on nitro-celluloid films) are in critical condition and we have to preserve them in archives not only electronically, but on film material as well.
{"title":"Some problems of a digital motion picture restoration system","authors":"G. Kovács, I. Kas","doi":"10.1109/VIPROM.2002.1026641","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026641","url":null,"abstract":"Some preliminary results of a \"Digital Motion Picture Restoration System For Archives\" (DIMORF) project are discussed. In this project a great amount of image and sound processing problems are solved and the results applied. The goal is to develop a system and a workstation for complete, high-resolution digital restoration of motion pictures specifically for the Hungarian National Film Archive. The system will correct the errors of image and sound as well. We plan to correct films, where the film material and volume of the sound (especially on nitro-celluloid films) are in critical condition and we have to preserve them in archives not only electronically, but on film material as well.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115460385","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026695
V. Klepac, S. Markovic
More and more broadcasters are turning to DV systems. Until now, there was no easy way to transfer the DV signal to other digital systems. With JVCs SA-DV 60E we have an efficient and easy way to transfer the DV signals to DV9 machines. Sony introduced an option board for the DSR-2000 that converts DVCAM A/V data streams into 50 Mbps conforming to the syntax specification of the 4:2:2P@ML standard. In this way, new digital interfaces make possible integration of DV formats to D9 and DVCAM to MPEG-2 4:2:2P@ML for production and post-production, and this could be a very good choice for broadcasters.
{"title":"Integration of DV to D9 and DVCAM to MPEG-2 system","authors":"V. Klepac, S. Markovic","doi":"10.1109/VIPROM.2002.1026695","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026695","url":null,"abstract":"More and more broadcasters are turning to DV systems. Until now, there was no easy way to transfer the DV signal to other digital systems. With JVCs SA-DV 60E we have an efficient and easy way to transfer the DV signals to DV9 machines. Sony introduced an option board for the DSR-2000 that converts DVCAM A/V data streams into 50 Mbps conforming to the syntax specification of the 4:2:2P@ML standard. In this way, new digital interfaces make possible integration of DV formats to D9 and DVCAM to MPEG-2 4:2:2P@ML for production and post-production, and this could be a very good choice for broadcasters.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115675263","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}
Pub Date : 2002-11-07DOI: 10.1109/VIPROM.2002.1026698
L. Mandić, S. Grgic, I. Srdić
The printing industry is on its way to become a multimedia industry. Printing will not be the only media and means of outputting information. Printed products and online media have a common prepress stage (premedia) which only diverges just before the functional output as electronic media or as printed media. A good example of the potential of the multimedia market is the use of efficient workflow. The data file can be directly transmitted to different media by efficient workflow. Thanks to digital technology, all captured text and image data can be used for multimedia purposes. An incorrect data format can affect the quality of a prepress product. The aim of this article is to discuss the most prevalent data formats used in open prepress systems.
{"title":"Data formats in digital prepress technology","authors":"L. Mandić, S. Grgic, I. Srdić","doi":"10.1109/VIPROM.2002.1026698","DOIUrl":"https://doi.org/10.1109/VIPROM.2002.1026698","url":null,"abstract":"The printing industry is on its way to become a multimedia industry. Printing will not be the only media and means of outputting information. Printed products and online media have a common prepress stage (premedia) which only diverges just before the functional output as electronic media or as printed media. A good example of the potential of the multimedia market is the use of efficient workflow. The data file can be directly transmitted to different media by efficient workflow. Thanks to digital technology, all captured text and image data can be used for multimedia purposes. An incorrect data format can affect the quality of a prepress product. The aim of this article is to discuss the most prevalent data formats used in open prepress systems.","PeriodicalId":223771,"journal":{"name":"International Symposium on VIPromCom Video/Image Processing and Multimedia Communications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114478521","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}
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