Pub Date : 1996-09-04DOI: 10.1109/WIVC.1996.624685
Li Weihua
This paper is concerned with networked multimedia technologies. It describes the characteristics of the multimedia systems. It studies the World Wide Web for distributed multimedia data. It also presents a useful language Java used to support multimedia information. It presents the author's work on Java to interact with audio files.
{"title":"Networking multimedia system","authors":"Li Weihua","doi":"10.1109/WIVC.1996.624685","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624685","url":null,"abstract":"This paper is concerned with networked multimedia technologies. It describes the characteristics of the multimedia systems. It studies the World Wide Web for distributed multimedia data. It also presents a useful language Java used to support multimedia information. It presents the author's work on Java to interact with audio files.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"18 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114018562","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.1996.624642
R. Kutka, A. Kaup, M. Hager
Narrowband video transmission via ISDN or wireless channels requires high compression factors. Common block-based coders achieve this by taking account of the statistical correlations within the image blocks. Correlations between neighbouring image blocks, however, are neglected. We present an approach using discrete cosine transforms which takes advantage of this additional information hidden in the statistical dependencies between neighbouring blocks in order to improve the image quality of the decoder. The luminance of the current block to be coded is predicted from the surrounding image blocks in order to correct coding errors. By this means the annoying blocking artefacts will be reduced. A smooth and well-balanced image display results. At the same time edges of real objects are undisturbed, thus the sharpness remains.
{"title":"Improving the image quality of block-based video coders by exploiting interblock redundancy","authors":"R. Kutka, A. Kaup, M. Hager","doi":"10.1109/WIVC.1996.624642","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624642","url":null,"abstract":"Narrowband video transmission via ISDN or wireless channels requires high compression factors. Common block-based coders achieve this by taking account of the statistical correlations within the image blocks. Correlations between neighbouring image blocks, however, are neglected. We present an approach using discrete cosine transforms which takes advantage of this additional information hidden in the statistical dependencies between neighbouring blocks in order to improve the image quality of the decoder. The luminance of the current block to be coded is predicted from the surrounding image blocks in order to correct coding errors. By this means the annoying blocking artefacts will be reduced. A smooth and well-balanced image display results. At the same time edges of real objects are undisturbed, thus the sharpness remains.","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":"133684767","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.1996.624644
M. Bartkowiak, M. Domański, P. Gerken
The paper describes a vector quantization technique which can be added to a standard codec, like H.263, in order to improve its performance for very high compression. The main idea is to convert two chrominance components of a video-telephone signal into one scalar signal. This scalar chrominance signal is then compressed in a motion compensated coder. The crucial problem is proper ordering of the pixel numbers which are labels of the codebook entries. This ordering dramatically influences the performance of the coder.
{"title":"Chrominance vector quantization for cellular video-telephony","authors":"M. Bartkowiak, M. Domański, P. Gerken","doi":"10.1109/WIVC.1996.624644","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624644","url":null,"abstract":"The paper describes a vector quantization technique which can be added to a standard codec, like H.263, in order to improve its performance for very high compression. The main idea is to convert two chrominance components of a video-telephone signal into one scalar signal. This scalar chrominance signal is then compressed in a motion compensated coder. The crucial problem is proper ordering of the pixel numbers which are labels of the codebook entries. This ordering dramatically influences the performance of the coder.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"32 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":"132153874","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.1996.624640
P. Czerepinski, D. Bull
Classical matching criteria for motion estimation determine the match quality by operating in the spatial domain. The resulting displaced frame difference signal is, however, compressed by means of frequency transformations, and any optimal matching criteria should estimate the cost of coding the composite bit stream. Such criteria are presented in this paper and shown to offer some improvement in the PSNR of the reconstructed sequence.
{"title":"Coder-oriented matching criteria for motion estimation","authors":"P. Czerepinski, D. Bull","doi":"10.1109/WIVC.1996.624640","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624640","url":null,"abstract":"Classical matching criteria for motion estimation determine the match quality by operating in the spatial domain. The resulting displaced frame difference signal is, however, compressed by means of frequency transformations, and any optimal matching criteria should estimate the cost of coding the composite bit stream. Such criteria are presented in this paper and shown to offer some improvement in the PSNR of the reconstructed sequence.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"22 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":"124607934","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.1996.624678
B. Meyer, W. Mattern
Current developments in the working/business environment and society demand quick information exchange at your fingertip. Some contradictory effects are: the ever increasing amount of information; multinational split teams at remote locations; small office/home office (SOHO); more travel, even abroad-increased cost. This situation demands for enhanced visual communication systems, preferably portable or at your office desk. Digital signal processing (DSP) technology with its high performance architectures is well suited to provide the needed horsepower for real-time audio and video processing.
{"title":"The interactive multifunctional communication terminal","authors":"B. Meyer, W. Mattern","doi":"10.1109/WIVC.1996.624678","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624678","url":null,"abstract":"Current developments in the working/business environment and society demand quick information exchange at your fingertip. Some contradictory effects are: the ever increasing amount of information; multinational split teams at remote locations; small office/home office (SOHO); more travel, even abroad-increased cost. This situation demands for enhanced visual communication systems, preferably portable or at your office desk. Digital signal processing (DSP) technology with its high performance architectures is well suited to provide the needed horsepower for real-time audio and video processing.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"213 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":"129433809","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.1996.624638
M. Karczewicz, J. Nieweglowski, P. Haavisto
This paper presents novel methods for motion compensated prediction and prediction error coding of video sequences. The scheme utilises segmentation of the video frames into nonregularly shaped segments composed of small square blocks which can be encoded with a very low number of bits. This two-step segmentation is obtained by quadtree-like splitting of image blocks followed by a motion assisted merging algorithm which yields segments characterised by uniformity of motion. Motion fields are compactly encoded using 2-D separable orthonormal polynomials. The number and order of these polynomials is established for each segment separately in an adaptive manner. To improve the efficiency of coding of the residual error, after motion compensated prediction the proposed scheme utilises the spatial properties of the prediction frame available in the encoder and the decoder. Results of the simulations described in this paper show that the presented scheme enables up to 45% bitrate reductions compared to the ITU-T Rec. H.263 video coder while achieving the same objective quality of coded video.
{"title":"Video coding using motion compensation with polynomial motion vector fields","authors":"M. Karczewicz, J. Nieweglowski, P. Haavisto","doi":"10.1109/WIVC.1996.624638","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624638","url":null,"abstract":"This paper presents novel methods for motion compensated prediction and prediction error coding of video sequences. The scheme utilises segmentation of the video frames into nonregularly shaped segments composed of small square blocks which can be encoded with a very low number of bits. This two-step segmentation is obtained by quadtree-like splitting of image blocks followed by a motion assisted merging algorithm which yields segments characterised by uniformity of motion. Motion fields are compactly encoded using 2-D separable orthonormal polynomials. The number and order of these polynomials is established for each segment separately in an adaptive manner. To improve the efficiency of coding of the residual error, after motion compensated prediction the proposed scheme utilises the spatial properties of the prediction frame available in the encoder and the decoder. Results of the simulations described in this paper show that the presented scheme enables up to 45% bitrate reductions compared to the ITU-T Rec. H.263 video coder while achieving the same objective quality of coded video.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"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":"134157989","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.1996.624668
U. Benzler
A subband approach to scalable multiresolution video coding is presented. In a first step of experiments this scheme is applied to the coding of I-frames, where bit rate savings up to 21.1% compared with MPEG-2 spatial scalability are achieved. In a next step it will be used for inter-frame coding of P- and B-frames.
{"title":"Scalable multiresolution video coding using subband decomposition","authors":"U. Benzler","doi":"10.1109/WIVC.1996.624668","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624668","url":null,"abstract":"A subband approach to scalable multiresolution video coding is presented. In a first step of experiments this scheme is applied to the coding of I-frames, where bit rate savings up to 21.1% compared with MPEG-2 spatial scalability are achieved. In a next step it will be used for inter-frame coding of P- and B-frames.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"6 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":"125002276","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.1996.624673
H. Lan, W. C. Wong
A hybrid video codec employing temporal subband coding, motion compensated discrete cosine transform (DCT) and vector quantization (VQ) is proposed. The lowest subband with similar characteristics to the original images uses H.261/263-type encoding. On the other hand, the higher subband signals contain temporal changes and edge information. Various encoding methods are explored and subsampling with VQ is found to provide good performance with low bit rate.
{"title":"Encoding temporal subband video signals","authors":"H. Lan, W. C. Wong","doi":"10.1109/WIVC.1996.624673","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624673","url":null,"abstract":"A hybrid video codec employing temporal subband coding, motion compensated discrete cosine transform (DCT) and vector quantization (VQ) is proposed. The lowest subband with similar characteristics to the original images uses H.261/263-type encoding. On the other hand, the higher subband signals contain temporal changes and edge information. Various encoding methods are explored and subsampling with VQ is found to provide good performance with low bit rate.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"54 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":"125944618","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.1996.624649
A. Aggoun, A. El-Mabrouk
An algorithm to improve block truncation coding for image compression is proposed. Images to be compressed are first differentiated and edge information is extracted by investigation of the histogram of small nonoverlapping blocks of the differential image. The image is classified into visually active and visually continuous blocks which are then coded individually.
{"title":"Image compression algorithm using local edge detection","authors":"A. Aggoun, A. El-Mabrouk","doi":"10.1109/WIVC.1996.624649","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624649","url":null,"abstract":"An algorithm to improve block truncation coding for image compression is proposed. Images to be compressed are first differentiated and edge information is extracted by investigation of the histogram of small nonoverlapping blocks of the differential image. The image is classified into visually active and visually continuous blocks which are then coded individually.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"46 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":"129392941","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.1996.624665
J. Bitó, T. Hohne, P. Noll
This paper propose an easy way to integrate VBR (variable bit rate) services in asynchronous DS/CDMA: each user is assigned a unique code. One user's VBR service can exceed channel bandwidth when new virtual channels that employ identical spreading codes are opened in parallel. A self-control mechanism has to be applied then to guarantee bit-asynchronism.
{"title":"Simulation study of multipath fading effects on integrated video, voice and data transmission in asynchronous BPSK-DS/CDMA systems","authors":"J. Bitó, T. Hohne, P. Noll","doi":"10.1109/WIVC.1996.624665","DOIUrl":"https://doi.org/10.1109/WIVC.1996.624665","url":null,"abstract":"This paper propose an easy way to integrate VBR (variable bit rate) services in asynchronous DS/CDMA: each user is assigned a unique code. One user's VBR service can exceed channel bandwidth when new virtual channels that employ identical spreading codes are opened in parallel. A self-control mechanism has to be applied then to guarantee bit-asynchronism.","PeriodicalId":422426,"journal":{"name":"Proceedings of First International Workshop on Wireless Image/Video Communications","volume":"64 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":"132396506","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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