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检索条件"主题词=Transcoding"

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Combined SNR and Temporal Scalability for H.264/AVC using Requantization transcoding and Hierarchical B Pictures

Combined SNR and Temporal Scalability for H.264/AVC using Re...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Jan De Cock Stijn Notebaert Rik Van de Walle Department of Electronics and Information Systems-Multimedia Laboratory Ghent University IBBT Ghent Belgium

Requantization transcoding is a fast technique for video bit-rate reduction. In our previous work, we proposed a hybrid architecture for the requantization of H.264/AVC bitstreams. In this architecture, the B pictures were open-loop transcoded. When B pictures are not used as reference for coding neighboring pictures, this is an acceptable approach, since the requantization errors, originating from the B pictures, can not propagate to other pictures. In this paper, however, we compare different transcoding methods in case the coded video streams are composed of hierarchical B pictures. Here, the necessity for compensating the accumulated requantization error in reference B pictures needs to be investigated. We show that extended compensation techniques result in trans-coded sequences that approach the rate-distortion optimal decoder-encoder cascade within 1 dB. Compensation of intra-coded macroblocks only is proven to be a low-complexity alternative, with only minor concessions in rate-distortion performance.

关键词： Scalability Automatic voltage control transcoding Bit rate Rate-distortion Decoding Computer architecture Information systems Multimedia systems Streaming media

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A Low Complexity Image Quality Metric for Real-Time Open-Loop transcoding Architectures

A Low Complexity Image Quality Metric for Real-Time Open-Loo...

引用

IEEE International Conference on Communications (ICC)

作者： C. Goudemand M. G. Gazalet F.-X. Coudoux P. Corlay M. Gharbi Institute of Electronics Microelectronics and Nanotechnology Department OAE University of Valenciennes France

In this paper, we present an original image quality metric for open-loop transcoding architectures based on frequency selective transmission. The proposed metric computes the normalized HVS-weighted mean squared error (NWMSE) between the reference digital video compressed bitstream, and its transcoded version. This computation is performed directly from the quantized DCT coefficients of the compressed bitstream. The resulting MSE error is implicitly weighted by the HVS sensitivity by considering the MPEG perceptual coding properties. Finally, rate control and error propagation are also taken into account, in order to improve transcoded video quality assessment. Experimental results are given which show that the proposed NWMSE metric correlates well with a conventional WPSNR. This validates the proposed assumptions used for the NWMSE computation. The major advantage of the approach is its simplicity since it does not need to perform the complete decoding of the compressed bitstream. Hence, the NWMSE metric is highly suited for real-time video applications.

关键词： Image quality transcoding Video compression Computer architecture Image coding Frequency Discrete cosine transforms Transform coding Error correction Quality assessment

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An Effective Motion Re-estimation in Frame-Skipping Video transcoding

An Effective Motion Re-estimation in Frame-Skipping Video Tr...

引用

International Conference on Computing: Theory and Applications, ICCTA

作者： Vasant Patil Rajeev Kumar Computer Science and Engineering Department Indian Institute of Technology Kharagpur West Bengal India

A new motion vector (MV) composition method, which we call temporal bi-directional dominant vector selection (TBDVS), for frame-skipping transcoding of pre-coded video is presented. The TBDVS utilizes a existing relationship, in pre-coded video, between the pixels of a frame and its reference frame(s) via MVs and selects a dominant MV from a set of candidate MVs to minimize prediction errors. It is general enough to handle frame-skipping, including I frame, in an arbitrary manner from a generic I-B-P frame structure video. Experimental results using cascaded pixel-domain transcoder show performance gain over the existing methods in terms of both quality and bit rate. We also propose a refinement method that adaptively adjusts the search range to further improve the performance at marginal cost

关键词： transcoding Bidirectional control Costs Bismuth MPEG 4 Standard Computer science Performance gain Bit rate Decoding Interpolation

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Multimedia Content transcoding for Displaying Space Synchronization on Web Browser

Multimedia Content Transcoding for Displaying Space Synchron...

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International Conference on Computational Science and its Applications (ICCSA)

作者： Daehyuck Park Euisun Kang Younghwan Lim Department of Media Soongsil University Seoul South Korea

This paper suggests how to convert existing multimedia learning titles into independent multimedia learning Title platform by using XML DB. It stores resource information that takes care of large amount of interactive multimedia learning resources. In existing multimedia learning titles, that resource information is divided and stored at multiple locations, but it store and manage the information in a database. Also Internet browsers are used to play those titles regardless of which platform those are played, so there are no needs for dedicated Multimedia Learning players. As a result of this research, multimedia learning titles can be played in various environments, like local terminal and server, without computer specification limitations.

关键词： transcoding Multimedia databases Space technology Frequency synchronization Educational institutions Computer displays XML Internet Multimedia systems DVD

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A transcoding Server for the Home Domain

A Transcoding Server for the Home Domain

引用

IEEE International Conference on Portable Information Devices, PORTABLE

作者： Francois Caron Stephane Coulombe Tao Wu Department of Software and IT Engineering ècole de Technologie Supérieure Montreal Canada Nokia Research Center Cambridge MA USA

This paper discusses the implementation of a video transcoding service for the Home Domain. The Home Domain is composed of personal computers, consumer electronics and mobile devices that communicate with each other via an IP network. However, due to the diversity of the capabilities of these devices (formats supported, memory, processing power, etc.), interoperability is a challenge. For instance, set-top boxes and DVD players support the MPEG-2 video format while mobile phones only support H.263 and/or MPEG-4. Adding a video transcoding service, acting as an intermediate between a digital media server and various digital media players, would allow transparent sharing of the media content within the network. This study has two main objectives. Firstly to insert transparently a transcoding service within the existing Home Domain architecture; and secondly to implement such a service using only open source software components. An FFmpeg-based video transcoding server for the Home Domain was implemented.

关键词： transcoding Network servers Video sharing Microcomputers Consumer electronics Mobile computing IP networks DVD Mobile handsets MPEG 4 Standard

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Motion Vector Composition Algorithm in H.264 transcoding

Motion Vector Composition Algorithm in H.264 Transcoding

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International Conference on Systems, Signals and Image Processing, IWSSIP

作者： F. Lonetti F. Martelli Consiglio Nazionale delle Ricerche Istituto di Scienza e Tecnologie dellInformazione Alessandro Faedo Pisa Italy Dipartimento di Informatica Università di Pisa Pisa Italy

In temporal transcoding, motion vector composition algorithms are used to reduce the computation time of the transcoding process. In this paper, we propose a multi-level motion vector composition scheme for H.264 transcoding, with the bilinear interpolation (BI) function. Simulation results show that the proposed algorithm achieves a video quality comparable with that of the motion estimation process with the advantage of greatly reducing the computation time of transcoding.

关键词： transcoding Motion estimation Video coding Video compression Interpolation Bismuth IEC standards ISO standards Codecs Motion compensation

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Motion Mapping for MPEG-2 to H.264/AVC transcoding

Motion Mapping for MPEG-2 to H.264/AVC Transcoding

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Jun Xin Jianjun Li Anthony Vetro Huifang Sun Shun-ichi Sekiguchi Mitsubishi Electric Research Laboratories Inc. Cambridge MA USA Mitsubishi Electric Corporation Limited Kamakura Japan

This paper describes novel motion mapping algorithms aimed for low-complexity MPEG-2 to AVC transcoding. The proposed algorithms efficiently map incoming MPEG-2 motion vectors to outgoing AVC motion vectors regardless of the block sizes that the motion vectors correspond to. Extensive simulation results show that our proposed transcoder incorporating the proposed algorithms achieves very good rate-distortion performance with low complexity. Compared with the cascaded decoder-encoder solution, the proposed approach could achieve similar coding efficiency while significantly reduce the complexity.

关键词： Automatic voltage control transcoding Decoding Motion estimation Multimedia communication Broadcasting High definition video Sun Laboratories Rate-distortion

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Complexity and quality assessment of MPEG-2 to H.264/AVC intra transcoding architectures

Complexity and quality assessment of MPEG-2 to H.264/AVC int...

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International Symposium on Signal Processing and Its Applications (ISSPA)

作者： Stijn Notebaert Jan De Cock Kenneth Vermeirsch Rik Van de Walle Department of Electronics and Information Systems Multimedia Laboratory Ghent Belgium

transcoding is used in order to enable elegant adaptation of video sequences without fully decoding and recoding. For efficiency reasons, special attention is paid to transform-domain adaptation of video sequences, hereby avoiding the cost of forward and inverse DCT or, in the case of H.264/AVC, integer transforms. In this paper we compare different architectures for MPEG-2 to H.264/-AVC intra transcoding, both in pixel and transform domain. We provide a complexity and quality discussion of both architectures, and propose an alternative architecture which results in improved quality over the transform-domain approach at reduced computational complexity. We show that the complexity can be even further reduced by using a combination of different techniques. This results in the fastest transcoding architecture for all intra prediction modes while approaching the visual quality of the optimal rate-distortion curve.

关键词： Quality assessment Automatic voltage control transcoding Computer architecture Video sequences Decoding Costs Discrete cosine transforms Computational complexity Rate-distortion

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Coding Mode Decision for High Quality MPEG-2 to H.264 transcoding

Coding Mode Decision for High Quality MPEG-2 to H.264 Transc...

引用

IEEE International Conference on Image Processing

作者： H. Kato A. Yoneyama Y. Takishima Y. Kaji KDDI R & D Laboratories Inc Multimedia Communications Laboratory Saitama Japan Tokyo University of Science Shinjuku-ku Tokyo Japan

This paper proposes a high quality coding mode decision method for MPEG-2 to H.264 transcoding. Here, we evaluate the coding modes of MPEG-2 stream in order to specify whether they should be inherited or changed in H.264 coding since many new coding schemes such as intra prediction have been introduced in H.264. By adaptively determining suitable intra/inter modes according to DCT coefficients, motion vectors (MVs), and neighboring macroblock (MB) modes of input MPEG-2 stream, high quality transcoding has been realized. In the experiment, we observed that the proposed method can improve a peak signal to noise ratio (PSNR) up to 0.29 dB at the cost of 22% more processing time compared with the conventional transcoding method.

关键词： transcoding Discrete cosine transforms Streaming media Laboratories PSNR Filters Research and development Multimedia communication Costs Video codecs

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Adaptive Error-Resilience transcoding and Fairness Grouping for Video Multicast Over Wireless Networks

Adaptive Error-Resilience Transcoding and Fairness Grouping ...

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IEEE International Conference on Communications (ICC)

作者： C.-M. Chen C.-W. Lin Y.-C. Chen Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan Chunghwa Telecom Company Limited Taiwan Department of Computer Science & Information Engineering National Chung Cheng University Chiayi Taiwan

In this paper, we present a two-pass intra-refresh transcoder for on-the-fly enhancing error resilience of a compressed video in a three-tier streaming system. Furthermore, we consider the problem of multicasting a video to multiple clients with diverse channel conditions. We propose a MINMAX loss rate estimation scheme to determine a single intra- refresh rate for all the clients in a multicast group. For the scenario that a quality variation constraint is imposed on the users, we also propose a grouping method to partition a multicast group of heterogeneous users into a minimal number of sub-groups to minimize the channel bandwidth consumption while meeting the quality variation constraint and achieving fairness among all sub-groups. Experimental results show that the proposed method can effectively mitigate the error propagation due to packet loss as well as achieve fairness not only among all sub-groups and also clients in a multicast group.

关键词： transcoding Wireless networks Video compression Resilience Streaming media Minimax techniques Bandwidth Propagation losses Network servers Feature extraction

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