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Bit-rate estimation for bit-rate reduction H.264/AVC video transcoding in wireless networks

Bit-rate estimation for bit-rate reduction H.264/AVC video t...

引用

International Symposium on Wireless Pervasive Computing (ISWPC)

作者： Qiang Tang Hassan Mansour Panos Nasiopoulos Rabab Ward Electrical and Computer Engineering Department University of British Columbia Vancouver Canada

Multimedia applications such as video streaming and mobile TV are emerging as the most promising applications over wireless networks. The increased coding efficiency and network friendly architecture of the latest video coding standard H.264/AVC has facilitated the delivery of coded video content to wireless users. However, wireless networks allow lower transmission bit-rates than wired networks while the display resolution of mobile devices is generally smaller than that of standard definition (SD) TV. This calls for fast bit-rate reduction techniques through video transcoding that can deliver the best video quality to the mobile receiver while adhering to the bit-rate constraints of the wireless network. In this paper, we present a bit-rate estimation model that speeds up the transcoding process by predicting the transcoded video bit-rate for different spatial resolution reduction ratios and quantization steps. We demonstrate that, on average, our proposed model can accurately estimate the bit-rate of the transcoded video to within 5% of the actual bit-rate of the transcoded video.

关键词： Automatic voltage control transcoding Wireless networks Streaming media Mobile TV Video coding Code standards Displays TV receivers Predictive models

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Content-Aware Video transcoding via Visual Attention Model Analysis

Content-Aware Video Transcoding via Visual Attention Model A...

引用

International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Chia-Hung Yeh Shih-Meng Chen Shiunn-Jang Chern Department of Electrical Engineering National Sun Yat-Sen University Taiwan

In this paper, a frame-drop transcoding algorithm based on visual attention model is proposed for reducing the temporal resolution of a compressed video in order to fit the channel target bitrate. In the proposed method, the visual attention model is employed to measure frame complexity in order to determine whether frames should be skipped or not. Through the model analysis, we can preserve the significant frames to avoid the jerky effect. Experimental results show that the proposed method can achieve higher quality compared to the period frame skipping method.

关键词： Image color analysis transcoding Bit rate Visualization Complexity theory Quantization Analytical models

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Enhanced Transform Domain Intra Prediction for MPEG-2 to H.264/AVC transcoding

Enhanced Transform Domain Intra Prediction for MPEG-2 to H.2...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Sang-Jun Yu Jin-Su Myung Dong-Gyu Sim Seoung-Jun Oh VIA-Multimedia Center Kwangwoon University South Korea

In this paper, we proposed an enhanced transform domain intra prediction for H.264/AVC. In the proposed scheme, H.264 intra prediction can be described by generalized linear operation after defining both H-filter and V-filter. Since intra prediction operation can be decomposed into some sparse matrices, we can reduce computational complexity for intra prediction. Our scheme can reduce the number of multiplication and addition operations more than Chen's by 22.4% and 21.6%, respectively, in each 4 times 4 block. We can insist that the proposed scheme can be used for fast transform domain intra prediction in the area of transcoding MPEG-2 streams into H.264/AVC streams.

关键词： Automatic voltage control transcoding Computational complexity Streaming media Video coding Sparse matrices Transform coding Video compression HDTV MPEG 4 Standard

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Supporting transcoding-based multicast groups

Supporting transcoding-based multicast groups

引用

International Conference on Telecommunications (ICT)

作者： Madiha Zafar Meir Fuchs Nigel Baker Mobile & Ubiquitous Systems Group CCCS Research Bristol UK VP Research & Development Bamboo Media Casting Kfar-Saba Israel Mobile & Ubiquitous Systems Group UWE CCCS Research Bristol UK

Leveraging the ubiquity of mobile devices, innovative social and cognitive applications are emerging. However, the gap between these social community services/applications and multicast transmission hinders their wide spread deployment and affect commercial viability. This leads us to rethink the existing broadcast/multicast transmission paradigm, especially group management features in mobile networks. We propose a hierarchal group management framework and shows how transcoding based groups can be managed. We discusses the network architecture and signaling interactions. Results are presented to highlight the resource usage for groups based in multiple codecs in an MBMS environment. This work is carried out as part of EU-IST project C-MOBILE (IST-2005-27423).

关键词： Codecs Media transcoding Mobile communication Multimedia communication Digital multimedia broadcasting Mobile computing

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A Study of MPEG-2 to H.264/AVC transcoding with Half-Horizontal Resolution

A Study of MPEG-2 to H.264/AVC Transcoding with Half-Horizon...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Jun Xin Anthony Vetro Shun-ichi Sekiguchi Xilient Inc. Cupertino USA Mitsubishi Electric Research Laboratories Inc. Cambridge USA Mitsubishi Electric Corporation Limited Kanagawa Japan

This paper analyzes the performance of MPEG-2 to H.264/AVC transcoding to half-horizontal resolution. Both the quality of the resulting video and complexity of the system are examined in the context of next-generation HDD recording systems. Experimental results show the importance of motion mapping to maintain high picture quality and that quality improvement over full-resolution transcoding is possible. It is also shown that transcoding to half-horizontal resolution allows for substantial reduction in complexity.

关键词： Automatic voltage control transcoding Decoding Filtering Filters High definition video Video compression Performance analysis Video recording Displays

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Down-sampling in DCT domain using linear transform with double-sided multiplication for image/video transcoding

Down-sampling in DCT domain using linear transform with doub...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Xiang Yu En-hui Yang Haiquan Wang Dept. of Electrical and Computer Engineering University of Waterloo Waterloo Ontario Canada Dept. of Electrical and Computer Engineering University of Waterloo Waterloo Canada

This paper proposes a designing framework for downsampling compressed images/video frames with arbitrary ratio in the discrete cosine transform (DCT) domain. We first derive a set of DCT-domain down-sampling methods which can be represented by a linear transform with double-sided matrix multiplication (LTDS) in the DCT domain, and show that the set contains a wide range of methods with various complexity and visual quality. Then, based on a pre-selected spatial- domain method, we formulate an optimization problem for finding an LTDS to approximate the given spatial domain method for achieving the best trade-off between the visual quality and the complexity. By selecting a spatial-domain reference method with the popular Butterworth lowpass filtering and bicubic interpolation, the proposed framework discovers LTDSs with better visual quality and lower computational complexity as saving 20%~70% execution time when compared with state-of-the-art methods in the literature.

关键词： Discrete cosine transforms transcoding Spatial resolution Video compression Filtering Filters Discrete transforms Image coding Interpolation Computational complexity

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A transcoding-Free Multiple Description Coder for Voice over Mobile Ad-Hoc Networks

A Transcoding-Free Multiple Description Coder for Voice over...

引用

IEEE Conference on Wireless Communications and Networking

作者： Jagadeesh Balam Jerry D. Gibson Ditech Networks Inc. Mountain View CA USA Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

We propose a new multiple description (MD) coder design based on the Adaptive Multi-Rate Wideband (AMR- WB) coder that can support transcoding-free communication between an ad-hoc network and another network that supports the AMR-WB codec. The encoder of the MD coder consists of the standard AMR-WB coder and a bit-stream splitting block that splits the AMR-WB bit-stream into two balanced descriptions. The decoder consists of a bit-stream substitution block that substitutes the missing bits, when only one description is received, to construct a valid AMR-WB frame that can be decoded using the standard AMR-WB decoder. We show that the performance of the new MD coder is better than a previous non-transcoding- free MD coder based on AMR-WB when transcoding is required and it is significantly better than using a single description of AMR-WB over the ad-hoc network supporting transcoding-free communication.

关键词： Ad hoc networks transcoding Decoding Code standards Diversity methods Mobile ad hoc networks Delay Speech codecs Speech coding Communication standards

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Fast intra mode decision algorithm for H.263 to H.264/AVC transcoding

Fast intra mode decision algorithm for H.263 to H.264/AVC tr...

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International Conference on Neural Networks and Signal Processing

作者： Xuan Jing Wan-Chi Siu Lap-Pui Chau A.G. Constantinides Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China School of Electrical and Electronic Engineering Nanyang Technological University Singapore Department of Electrical and Electronic Engineering Imperial College London London UK

ISBN: (纸本)9781424423101

In this paper, we present a fast mode decision method for H.263 to H.264/AVC intraframe transcoding. The proposed algorithm is based on the observation that features of DCT coefficients extracted from H.263 coded intraframe strongly relates to the optimal mode in H.264/AVC intra mode decision. Specifically, the total number of non-zero AC coefficients of four 8times8 DCT blocks in H.263 is taken as a measurement in the intra block size decision. The objective is to reject improbable block types in earlier stages in order to achieve computation saving. In addition, a transform domain edge direction estimation is also adopted into our scheme to further speed up the intra mode prediction. Simulation results show that the proposed approach can reduce the computational complexity of intraframe transcoding by up to 65% while maintaining the rate-distortion (R-D) performance.

关键词： Automatic voltage control transcoding Prediction algorithms Complexity theory Transforms Signal processing algorithms Encoding

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Efficient spatial resolution reduction transcoding for H.264/AVC

Efficient spatial resolution reduction transcoding for H.264...

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IEEE International Conference on Image Processing

作者： Jan De Cock Stijn Notebaert Kenneth Vermeirsch Peter Lambert Rik Van de Walle Department of Electronics and Information Systems-Multimedia Lab Ghent University IBBT Ghent Belgium

In this paper, we present a spatial resolution reduction transcoding architecture for H.264/AVC, which extends open-loop transcoding with a low-complexity compensation technique in the reduced-resolution domain. The proposed architecture removes visual artifacts from the transcoded sequence, while keeping complexity significantly lower than more traditional cascaded decoder-encoder architectures. The refinement step of the proposed architecture can be used to further improve rate-distortion performance, at the cost of additional complexity. In this way, a dynamic-complexity transcoder is rendered possible.

关键词： Spatial resolution transcoding Automatic voltage control Video coding Decoding Streaming media Video sequences Frequency synthesizers Motion compensation Information systems

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On the architecture of H.264 to H.264 homogeneous transcoding platform

On the architecture of H.264 to H.264 homogeneous transcodin...

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International Conference on Neural Networks and Signal Processing

作者： W.C. Siu Y.H. Kam W.L. Hui W.H. Wong Lili Wang C.W. Kok Centre for Signal Processing Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China

ISBN: (纸本)9781424423101

For homogeneous transcoding, we usually transfer a compressed video into a lower bit-rate and/or video with a smaller size. In this paper we introduce the general architecture of a downing sizing transcoder and propose some novel techniques for its practical realization, including motion vector re-estimation, sub-pixel motion re-estimation, mode re-decision, etc. We then generalize the idea of transcoding to video enlargement and propose a simple framework for its re-encoding. The paper ends with some useful remarks on the formation of super-resolution videos via the transcoder frame work.

关键词： Interpolation transcoding Pixel Image resolution Strontium Encoding Image coding

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