Pub Date : 1996-09-04DOI: 10.1109/WIVC.1996.624675
J. Laier, S. Panis, J. Cosmas, R. Scaefer, A. J. Pearmain
This paper presents a platform for the development and evaluation of MPEG-4 functionalities. The implemented functionalities are content-based multimedia data access, content-based manipulation and bitstream editing, hybrid natural and synthetic data combination, content-based scalability. The system was implemented with Java.
{"title":"Content-based multimedia data access in Internet video communication","authors":"J. Laier, S. Panis, J. Cosmas, R. Scaefer, A. J. Pearmain","doi":"10.1109/WIVC.1996.624675","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624675","url":null,"abstract":"This paper presents a platform for the development and evaluation of MPEG-4 functionalities. The implemented functionalities are content-based multimedia data access, content-based manipulation and bitstream editing, hybrid natural and synthetic data combination, content-based scalability. The system was implemented with Java.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114608706","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624637
M. Frater, J. Arnold, Jiaxin Zhang, M.C. Cavenor
The interest that has been shown in the provision of mobile communications systems has led to the study of real time video traffic over wireless and other error prone networks. Many of the papers in this area employ the MPEG-2 video coding algorithm and provide experimental results of the decoded image quality derived from using only the effect of cell loss on the MPEG-2 video layer. In a practical transmission scheme, this video information is combined with the audio and synchronisation information in the MPEG-2 systems layer. Results presented in this paper show that the omission of the effect of cell loss on the MPEG-2 systems layer may lead to a significant underestimation of the degradation in the quality of the decoded video.
{"title":"Wireless video: the impact of the multiplexing layer on error resilience","authors":"M. Frater, J. Arnold, Jiaxin Zhang, M.C. Cavenor","doi":"10.1109/WIVC.1996.624637","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624637","url":null,"abstract":"The interest that has been shown in the provision of mobile communications systems has led to the study of real time video traffic over wireless and other error prone networks. Many of the papers in this area employ the MPEG-2 video coding algorithm and provide experimental results of the decoded image quality derived from using only the effect of cell loss on the MPEG-2 video layer. In a practical transmission scheme, this video information is combined with the audio and synchronisation information in the MPEG-2 systems layer. Results presented in this paper show that the omission of the effect of cell loss on the MPEG-2 systems layer may lead to a significant underestimation of the degradation in the quality of the decoded video.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130437205","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624646
K. Godfrey, Y. Attikiouzel
This paper shows that quantisation of colour pixels, essential to digital imagery, causes non-linear correlation in the permitted values of chromaticity coordinates in linear-intensity CIE colour spaces. It follows that colour video and image coding schemes based on these colour spaces will suffer an inherent preference for certain chromaticities.
{"title":"Non-linear quantisation effects in digital colour systems","authors":"K. Godfrey, Y. Attikiouzel","doi":"10.1109/WIVC.1996.624646","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624646","url":null,"abstract":"This paper shows that quantisation of colour pixels, essential to digital imagery, causes non-linear correlation in the permitted values of chromaticity coordinates in linear-intensity CIE colour spaces. It follows that colour video and image coding schemes based on these colour spaces will suffer an inherent preference for certain chromaticities.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"2009 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130929584","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624639
P. Antoszczyszyn, J. Hannah, Peter Grant
A new method of tracking the position of important facial features in 'head-and-shoulders' sequences is presented for low bit-rate wireless communication. The initial part of the analysed sequence is decomposed into sub-images containing important facial features. Tracking of the facial features in subsequent frames is based on this set of sub-images.
{"title":"Principal components analysis for tracking of facial features","authors":"P. Antoszczyszyn, J. Hannah, Peter Grant","doi":"10.1109/WIVC.1996.624639","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624639","url":null,"abstract":"A new method of tracking the position of important facial features in 'head-and-shoulders' sequences is presented for low bit-rate wireless communication. The initial part of the analysed sequence is decomposed into sub-images containing important facial features. Tracking of the facial features in subsequent frames is based on this set of sub-images.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132728024","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624658
A. Seeger
For the transmission of video on time variant mobile radio channels we discuss a self-adapting hierarchical channel coding scheme. Based on the cutoff rate for multilevel coding on fading channels we derive a procedure for the joint design of unequal error protection and clustered signal constellation.
{"title":"Information theoretic based design of hierarchical channel coding and modulation on mobile radio channels","authors":"A. Seeger","doi":"10.1109/WIVC.1996.624658","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624658","url":null,"abstract":"For the transmission of video on time variant mobile radio channels we discuss a self-adapting hierarchical channel coding scheme. Based on the cutoff rate for multilevel coding on fading channels we derive a procedure for the joint design of unequal error protection and clustered signal constellation.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133463953","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624653
Robert, E., Van Dyck, George M. Horihan
In this paper, an error resilient, wavelet-based compression algorithm is studied for the transmission of images and video over severely band-limited tactical communications channels. The underlying communications system uses both direct sequence spreading and fast frequency hopping to provide anti-jam capability. As a result of the hopping, noncoherent detection is used. The bit rate available for video will generally be under 300 kb/s. To make effective use of the channel, an optimal trade-off between source and channel coding is desired. For system variants, when it will be possible to also change the modulation, the optimization should include the source, channel, and modulation.
{"title":"Wavelet video transmission over tactical wireless channels","authors":"Robert, E., Van Dyck, George M. Horihan","doi":"10.1109/WIVC.1996.624653","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624653","url":null,"abstract":"In this paper, an error resilient, wavelet-based compression algorithm is studied for the transmission of images and video over severely band-limited tactical communications channels. The underlying communications system uses both direct sequence spreading and fast frequency hopping to provide anti-jam capability. As a result of the hopping, noncoherent detection is used. The bit rate available for video will generally be under 300 kb/s. To make effective use of the channel, an optimal trade-off between source and channel coding is desired. For system variants, when it will be possible to also change the modulation, the optimization should include the source, channel, and modulation.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117048234","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624635
N. Farber, E. Steinbach, B. Girod
For mobile video server access, precoded bitstreams have to be transmitted at very low bitrates over error-prone channels. In this paper, we investigate an H.263 compatible approach to robust transmission of stored video bit-streams that is based on a feedback channel. As a side product, our method allows random access without the overhead of periodic I-frames. Results are presented for a data-rate of 25 kbps and and QCIF resolution (176/spl times/144 pel).
{"title":"Robust H.263 compatible transmission for mobile video server access","authors":"N. Farber, E. Steinbach, B. Girod","doi":"10.1109/WIVC.1996.624635","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624635","url":null,"abstract":"For mobile video server access, precoded bitstreams have to be transmitted at very low bitrates over error-prone channels. In this paper, we investigate an H.263 compatible approach to robust transmission of stored video bit-streams that is based on a feedback channel. As a side product, our method allows random access without the overhead of periodic I-frames. Results are presented for a data-rate of 25 kbps and and QCIF resolution (176/spl times/144 pel).","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121841856","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624662
J. Streit, L. Hanzo
A comparative study of arbitrarily programmable, but fixed-rate videophone codecs using quarter common intermediate format (QCIF) video sequences scanned at 10 frames/s is offered. These codecs were designed to allow direct replacement of mobile radio voice codecs in second generation wireless systems, such as the Pan-European GSM, the American IS-54 and IS-95 as well as the Japanese systems, operating at 13, 8, 9.6 and 6.7 kbps, respectively.
{"title":"Fixed-rate video codecs for wireless systems","authors":"J. Streit, L. Hanzo","doi":"10.1109/WIVC.1996.624662","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624662","url":null,"abstract":"A comparative study of arbitrarily programmable, but fixed-rate videophone codecs using quarter common intermediate format (QCIF) video sequences scanned at 10 frames/s is offered. These codecs were designed to allow direct replacement of mobile radio voice codecs in second generation wireless systems, such as the Pan-European GSM, the American IS-54 and IS-95 as well as the Japanese systems, operating at 13, 8, 9.6 and 6.7 kbps, respectively.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"12 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116550096","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624670
H. Gharavi, W. Ng
This paper presents an efficient scaleable subband based coding scheme suitable for multilayer transmission over mobile channels. The method is capable of encoding and decoding video in a hierarchical multiresolution fashion with full compatibility to ITU T H.263. In this approach the higher frequency decomposed bands of the prediction error signal are each encoded by a combination of DCT, uniform quantisers and 3D-VLC.
{"title":"H.263 compatible video coding and transmission","authors":"H. Gharavi, W. Ng","doi":"10.1109/WIVC.1996.624670","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624670","url":null,"abstract":"This paper presents an efficient scaleable subband based coding scheme suitable for multilayer transmission over mobile channels. The method is capable of encoding and decoding video in a hierarchical multiresolution fashion with full compatibility to ITU T H.263. In this approach the higher frequency decomposed bands of the prediction error signal are each encoded by a combination of DCT, uniform quantisers and 3D-VLC.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123445661","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 : 1996-09-04DOI: 10.1109/WIVC.1996.624667
H. Gharavi, C. I. Richards
This paper introduces an efficient technique for dividing a pre-coded MPEG-2 bitstream into an arbitrary number of partitions, in decreasing order of visual importance. For a fixed partition size ratio, this has been achieved by VLC code interleaving within a macroblock or group of macroblocks. The algorithm is capable of recreating a syntactically correct bitstream, regardless of the error rate on secondary partitions, making it applicable to many efficient transmission schemes.
{"title":"Efficient partitioning of coded video bitstreams for multi-channel wireless transmission","authors":"H. Gharavi, C. I. Richards","doi":"10.1109/WIVC.1996.624667","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624667","url":null,"abstract":"This paper introduces an efficient technique for dividing a pre-coded MPEG-2 bitstream into an arbitrary number of partitions, in decreasing order of visual importance. For a fixed partition size ratio, this has been achieved by VLC code interleaving within a macroblock or group of macroblocks. The algorithm is capable of recreating a syntactically correct bitstream, regardless of the error rate on secondary partitions, making it applicable to many efficient transmission schemes.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"74 2 Pt 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121905541","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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