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检索条件"主题词=transform coding"

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Reconfigurable video coding: Objectives and technologies

Reconfigurable video coding: Objectives and technologies

引用

IEEE International Conference on Image Processing

作者： Christophe Lucarz Ihab Amer Marco Mattavelli Microelectronic Systems Laboratory Ecole Polytechnique Fédérale de Lausanne Lausanne Switzerland

The main objective of the MPEG Reconfigurable Video coding (RVC) standard is to establish a framework for a more flexible usage of standard video coding technology. The framework not only supports multiple standards and new coding configurations, but also provides an incremental and modular approach to innovation in video compression development and design. This paper provides an overview of the main objectives of RVC, standard accompanied with a presentation of the components of the framework for both normative parts and supporting tools useful for the final implementation of RVC codecs. These elements include: the Video Tool Library (VTL), the new standard RVC-CAL language used for the specification of the library, the Bitstream Syntax Description (BSD) used for the specification of the compressed bitstreams, as well as the Functional unit Network Description (FND) that constitutes the specification of a modular library. Technologies and tools that support the RVC standard are also briefly introduced.

关键词： Video coding Video compression Codecs Decoding ISO standards Code standards Libraries Hardware transform coding Standards development

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Fine-grain scalable audio coding based on envelope restoration and the SPIHT algorithm

Fine-grain scalable audio coding based on envelope restorati...

引用

International Conference on Digital Signal Processing (DSP)

作者： Heiko Hansen Stefan Strahl Alfred Mertins Department of Physics Carl von Ossietzky University슠of슠Oldenburg Oldenburg Germany Institute of Signal Processing University of Lübeck Lubeck Germany

We present strategies for perceptual improvements of embedded audio coding based on psychoacoustic weighting and spectral envelope restoration. The encoding schemes exhibit fine-grain bitrate scalability via the set partitioning in hierarchical trees (SPIHT) algorithm. Weighting factors and envelope parameters are transmitted under careful consideration of the amount of side information. For low bitrates, where the number of actually transmitted waveform coefficients is low, missing coefficients are shaped w.r.t. the spectral envelope. In our approach, the envelope information is transmitted in form of band-wise values of the l 1 -norm. Sets of standardized audio files as well as various audio data of contemporary music are encoded and the results are analyzed with objective measures of perceptual quality. The proposed coding scheme competes in perceptual quality with existing state-of-the-art fixed bitrate coders such as MPEG-2/4 AAC. For low bitrates, the proposed embedded coding envelope restoration (ECER) improves the perceptual audio quality notably.

关键词： Audio coding Bit rate Masking threshold Quantization Partitioning algorithms Signal processing algorithms Scalability Psychoacoustic models Psychology transform coding

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Didstributed source coding authentication of images with affine warping

Didstributed source coding authentication of images with aff...

引用

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

作者： Yao-Chung Lin David Varodayan Bernd Girod Information Systems Laboratory University of Stanford Stanford CA USA

Media authentication is important in content delivery via untrusted intermediaries, such as peer-to-peer (P2P) file sharing. Many differently encoded versions of a media file might exist. Our previous work applied distributed source coding not only to distinguish the legitimate diversity of encoded images from tampering but also to localize tampered regions in an image already deemed to be in authentic. In both cases, authentication requires a Slepian-Wolf encoded image projection that is supplied to the decoder. We extend our scheme to authenticate images that have undergone affine warping. Our approach incorporates an expectation maximization algorithm into the Slepian-Wolf decoder. Experimental results demonstrate that the proposed algorithm can distinguish legitimate encodings of authentic images from illegitimately modified versions, despite an arbitrary affine warping, using authentication data of less than 250 bytes per image.

关键词： Source coding Authentication Decoding Peer to peer computing Image coding Bismuth Parity check codes Streaming media transform coding Image reconstruction

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Forward adaptive KLT coding

Forward adaptive KLT coding

引用

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

作者： Carlos E. Davila Electrical Engineering Department Southern Methodist University Dallas TX USA

A framework for implementing the forward adaptive Karhunen-Loeve transform (FAKLT) is described. Unlike backward adaptive methods, FAKLT computes transform coefficients using basis vectors derived from the most recent signal frame. As a result, it exhibits improved energy compaction compared to the backward adaptive KLT. The method encodes only the KLT coefficients and a small amount of side information, the KLT basis vectors (eigenvectors) are not encoded.

关键词： Karhunen-Loeve transforms Decoding Autocorrelation Eigenvalues and eigenfunctions transform coding GSM Compaction Data compression Adaptive systems Compression algorithms

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Perceptual image coding by standard-constraint codecs

Perceptual image coding by standard-constraint codecs

引用

Picture coding Symposium, PCS

作者： Thomas Richter RUS Computing Center University of Stuttgart Stuttgart Germany

A perceptual image compression codec exploits the characteristics of the human senses to minimize the perceivable quality loss of digital images under compression. Such a codec has an even higher value if the resulting code-streams are compatible to an existing standard, and are thus decode-able by all-day, existing applications. This work describes strategies how to implement perceptual coding in standardized environments, namely JPEG, JPEG 2000 and JPEG-XR.

关键词： Image coding Codecs Code standards transform coding Decoding ISO standards Standardization Humans Pixel Pipelines

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Subjective assessment of switching in H264 SVC video coding standard

Subjective assessment of switching in H264 SVC video coding ...

引用

International Conference on Computer Science & Education (ICCSE)

作者： Wei Gong Xiaoxu Zhang Department of Electronics and Information Engineering Tianjin Institute of Urban Construction tjuci Tianjin China

H.264 SVC is the scalable extension of H.264/AVC standard. This article provides an overview of the technical features of which enhanced compression performance and provision of a ldquonetwork-friendlyrdquo video representation addressing ldquoconversationalrdquo (video telephony) and ldquonon-conversationalrdquo (storage, broadcast, or streaming) applications. And we describe the subjective assessment methodologies, make a prediction about the switching on the decoder side, then give a recommendation for it.

关键词： Static VAr compensators Video coding Video compression Automatic voltage control Scalability Streaming media Decoding Spatial resolution transform coding Computer science

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Efficient Bit-Plane coding Scheme for EBCOT Algorithm in JPEG2000

Efficient Bit-Plane Coding Scheme for EBCOT Algorithm in JPE...

引用

International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Tsung-Han Tsai Che-Wei Chang Chih-Lun Fang Department of Electrical Engineering National Central University Jhongli Taiwan

ISBN: (纸本)9781424455430

In JPEG2000, embedded block coding with optimized truncation (EBCOT) requires a lot of computations. To enhance the performance of EBCOT, an efficient EBCOT algorithm is proposed. This algorithm consists of pass-prediction and pass-propagation. Pass prediction predicts the pass state in the next bit-plane. In particular, pass propagation generates the state of neighboring passes in the next bit-plane. This work also accomplishes boundary pass classification. With the propagated state, the pass state of the code-block can be classified for indicating the correct coding method. Various simulations have been conducted. The experimental results show that the proposed algorithm reduces the number of scan times by 42% to 52.7% for gray-level images and 11.8% to 34% for color images. The comparison demonstrates that the performance of our proposed method is higher than that of previous methods.

关键词： Image coding transform coding Arithmetic Discrete wavelet transforms Context modeling Block codes Embedded computing Color Wavelet coefficients IEC standards

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Two-pass reconstruction in distributed video coding

Two-pass reconstruction in distributed video coding

引用

Picture coding Symposium, PCS

作者： Hongbin Liu Yongpeng Li Xianming Liu Siwei Ma Debin Zhao Wen Gao Department of Computer Science and Technology P.R. Harbin Institute of Technology Harbin China Chinese Academy of Sciences Beijing China Department of Computer Science and Technology Harbin Institute of Technology Harbin China Institute of Digital Media School of Electronic Engineering and Computer Science Peking University Beijing China

In this paper, we propose a novel two-pass reconstruction algorithm for the Wyner-Ziv (WZ) frames in distributed video coding (DVC), in which the traditional reconstructed WZ frame is utilized to perform motion estimation to obtain a more accurate motion field. During the motion estimation, the block, as well as its neighboring pixels are concerned. An overlapped block motion compensation is subsequently performed with the help of the motion field, consequently, an enhanced prediction for the WZ frame can be obtained, based on which an improved reconstruction can be achieved. Simulation results show that both the objective and subjective quality of WZ frames can be improved significantly.

关键词： Video coding Decoding Motion estimation Codecs Computer science Video compression Reconstruction algorithms Motion compensation Computational modeling transform coding

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A joint layered coding scheme for unified reliable and secure media transmission with implementation on JPEG 2000 images

A joint layered coding scheme for unified reliable and secur...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Xinglei Zhu Zhishou Zhang Chang Wen Chen Department of Computer Science and Engineering State University of New York Buffalo Buffalo NY USA Hewlett-Packard China Zhangjiang Hi-Tech Park Shanghai China

This paper presents a novel stream-level joint layered coding scheme for unified reliable and secure media transmission over wireless networks. The proposed scheme simultaneously protects both compressed media content and the authentication data from wireless channel impairments. Therefore, the media quality degradation incurred by both channel noise and authentication constraints can be minimized. With a prior knowledge of source coding and channel coding, the proposed joint system integrates authentication into the media error protection components to ensure 100% effective verification probability, i.e. every source decodable media unit is authenticable. In particular, by utilizing the contextual relationship, such as coding dependency and content importance between media slices for authentication hash appending, the proposed scheme generates an extremely low authentication overhead. The proposed authentication scheme is fundamentally different from many existing systems that consider the problem of authenticating media content separately from the other operations in the media transmission system. Under this joint layered coding framework, an optimal rate allocation algorithm for source coding, channel coding and media authentication is developed to guarantee the end-to-end media quality. Experiment results on JPEG 2000 images validate the proposed scheme and demonstrate that the performance of the proposed approach is approaching its upper bound, in which case no authentication is applied to the media stream.

关键词： Image coding Authentication Streaming media Protection Source coding Channel coding transform coding Wireless networks Communication system security Degradation

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Information Synthesis Algorithm Based on ROI coding Method of JPEG2000

Information Synthesis Algorithm Based on ROI Coding Method o...

引用

International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Xin-lin Huang Gang Wang Quan-rui Liao Chun-gang Liu Communication Research Center Harbin Institute of Technology Harbin China

In the date-link transmission systems, especially video-guided systems, information data and image data are transmitted among the communication units. A kind of synthesis algorithm is proposed based on region of interesting (ROI) coding method of JPEG2000. Since the algorithm is based on pixel data level, it is easy to realize for application. The simulation results show that reconstructed image quality decays ldB under low compression rate, while almost 0 dB under compression rate larger than 0.3 bpp.

关键词： Image coding transform coding Image quality Decoding Image reconstruction Streaming media TV Missiles Narrowband Layout

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