检索结果-内蒙古大学图书馆

Secure advanced video coding based on selective encryption algorithms

IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2006年第2期52卷 621-629页

作者： Lian, Shiguo Liu, Zhongxuan Ren, Zhen Wang, Haila France Telecom R&D Beijing 100080 Peoples R China

advanced video coding is recently announced and widely used, although the according protection means have not been developed thoroughly. In this paper, a secure A VC coding scheme is presented based on some partial encryption algorithms. During AVC encoding, such sensitive data as intra-prediction mode, residue data and motion vector are encrypted partially. Among them, the intra-prediction mode is encrypted based on Exp-Golomb entropy coding, the intra-macroblocks' DCs are encrypted based on context-based adaptive variable length coding (CAVLC), and intra-macroblocks' ACs and the inter-macroblocks' MVDs are sign-encrypted with a stream cipher followed with variable-length coding. This encryption scheme is secure in perception, keeps format compliance, and obtains high time efficiency though reducing the encrypted data volumes. These properties make it practical to incorporate encryption/decryption process into compression/decompression process, and thus suitable for secure video transmission or sharing.

关键词： video encryption advanced video coding digital right management media content protection

来源：评论

学校读者我要写书评

暂无评论

Context-adaptive binary arithmetic coding with precise probability estimation and complexity scalability for high-efficiency video coding

引用

JOURNAL OF ELECTRONIC IMAGING 2016年第1期25卷 1-16页

作者： Karwowski, Damian Domanski, Marek Poznan Univ Tech PL-60965 Poznan Poland

An improved context-based adaptive binary arithmetic coding (CABAC) is presented. The idea for the improvement is to use a more accurate mechanism for estimation of symbol probabilities in the standard CABAC algorithm. The authors' proposal of such a mechanism is based on the context-tree weighting technique. In the framework of a high-efficiency video coding (HEVC) video encoder, the improved CABAC allows 0.7% to 4.5% bitrate saving compared to the original CABAC algorithm. The application of the proposed algorithm marginally affects the complexity of HEVC video encoder, but the complexity of video decoder increases by 32% to 38%. In order to decrease the complexity of video decoding, a new tool has been proposed for the improved CABAC that enables scaling of the decoder complexity. Experiments show that this tool gives 5% to 7.5% reduction of the decoding time while still maintaining high efficiency in the data compression. (C) 2016 SPIE and IS&T

关键词： video compression advanced video coding high-efficiency video coding entropy coding context-based adaptive binary arithmetic coding improved context-based adaptive binary arithmetic coding

来源：评论

学校读者我要写书评

暂无评论

Multi-directional Mode Reduction Algorithm for Intra Prediction in video coding

引用

IETE TECHNICAL REVIEW 2017年第1期34卷 102-109页

作者： Tsai, An Chao Bharanitharan, K. Tajen Univ Dept Digital Multimedia Design Pingtong Taiwan Hanyang Univ Dept Elect Engn Seoul South Korea

The recent digital video-coding standard achieves very high data compression by using several new coding features, such as intra/inter predictions, variable block size motion compensation, multiple motion vectors, quarter pixel for motion compensation and so on. Among all the features, one of the key features is intra prediction, which is based on the rate-distortion optimization (RDO) procedure that requires a true encoding of the intra block by trying all intra prediction modes. In this paper, we propose a multi-directional mode reduction (MDMR) algorithm using the prediction error to reduce the number of coding modes required for the RDO procedure. The proposed MDMR algorithm effectively estimates the prediction error of the block to narrow down the predictive modes to reduce RDO computation. Experimental results show that the proposed algorithm achieves a time reduction of more than 64% with negligible PSNR loss and bitrate increment.

关键词： advanced video coding Edge detection H.264/AVC Inter prediction Intra prediction Motion estimation Prediction error

来源：评论

学校读者我要写书评

暂无评论

Overview of the H.264/AVC video coding standard

Overview of the H.264/AVC video coding standard

引用

Conference on Applications of Digital Image Processing XXVI

作者： Luthra, A Topiwala, P Motorola Inc BCS San Diego CA 92121 USA

ISBN: (纸本)0819450766

H.264/MPEG-4 AVC is the latest coding standard jointly developed by the video coding Experts Group (VCEG) of ITU-T and Moving Picture Experts Group (MPEG) of ISO/IEC. It uses state of the art coding tools and provides enhanced coding efficiency for a wide range of applications including video telephony, video conferencing, TV, storage (DVD and/or hard disk based), streaming video, digital video creation, digital cinema and others. In this paper an overview of this standard is provided. Some comparisons with the existing standards, MPEG-2 and MPEG-4 Part 2, are also provided.

关键词： digital video compression MPEG H.264 advanced video coding AVC JVT MPEG-4 part 10

来源：评论

学校读者我要写书评

暂无评论

Arithmetic coding with forbidden symbol and optimized adaptive context tree modeling (GRASP algorithm) for H.264 video coders

Arithmetic coding with forbidden symbol and optimized adapti...

引用

International Conference on Signal Processing, Communications and Networks

作者： Logashanmugam, E. Sreejaa, B. S. Ramachandran, R. Sathyabama University Sri Venkateswara College of Engineering Chennai

ISBN: (纸本)9781424409969

In this paper we propose applying an adaptive context tree weighting method with a forbidden symbol in the H.264 coder. Arithmetic codes with a forbidden symbol and a trellis search techniques are employed on an order to estimate the best transmitted codeword. Instead of using the context modeling defined in the H.264 standard, the arithmetic code with a forbidden symbol uses a CTW method. The CABAC algorithm is replaced by GRASP algorithm and the experimental results show that coding gains similar or superior to those obtained with the H.264/AVC CABAC algorithm and arithmetic coding.

关键词： advanced video coding arithmetic coding forbidden symbol GRASP algorithm CTW method and compression

来源：评论

学校读者我要写书评

暂无评论

Efficient Differential Prediction Error based Intra Mode Decision Algorithm for video coding

Efficient Differential Prediction Error based Intra Mode Dec...

引用

IEEE International Symposium on Intelligent Signal Processing and Communications Systems (ISPACS)

作者： Bharanitharan, K. Chen, B. W. Tsai, An Chao Feng Chia Univ Dept Elect Engn Taichung 40724 Taiwan Natl Cheng Kung Univ Dept Elect Engn Tainan Taiwan FOXCONN Taipei Taiwan

ISBN: (纸本)9781467350839;9781467350815

H.264, MPEG-4 Part 10, is the recent digital video coding standard that achieves very high data compression by using several new coding features. One of the key features is intra prediction which is based on the rate distortion optimization (RDO) procedure, that requires a true encoding of the intra block by trying all intra prediction modes. The computational burden of intra prediction with the RDO procedure is extremely high for real time applications. In this paper, we propose an efficient directional difference prediction algorithm using the prediction error to reduce the number of coding modes required for the RDO procedure. The proposed DDP algorithm effectively estimates the prediction error of the block to narrow down the predictive modes to reduce RDO computation. Experimental results show that the proposed algorithm achieves a time reduction of more than 64% with negligible PSNR loss and bitrate increment.

关键词： advanced video coding H.264/AVC Intra prediction mode decision prediction error

来源：评论

学校读者我要写书评

暂无评论

Adaptive selection model for detecting zero-quantized discrete cosine transform coefficients in video coding

引用

OPTICAL ENGINEERING 2012年第4期51卷 047404-047404页

作者： Chen, Bo-Jhih Tai, Shen-Chuan Wu, Yung-Gi Natl Cheng Kung Univ Dept Elect Engn Inst Comp & Commun Engn Tainan 70101 Taiwan Chang Jung Christian Univ Dept Comp Sci & Informat Engn Tainan Taiwan

An adaptive selection approach for advanced video coding that reduces the number of unnecessary discrete cosine transform (DCT), quantization (Q), inverse quantization (IQ), and inverse DCT (IDCT) computations is proposed. An adaptive selection approach is used to detect zero-quantized DCT (ZQDCT) coefficients since certain zero-quantized DCT coefficients of the prediction residual block are difficult to identify. The presented algorithm detects ZQDCT coefficients according to the corresponding frequency positions before implementing DCT. Therefore, redundant DCT, Q, IQ, and IDCT procedures are removed. To carry out the proposed algorithm, three sufficient conditions are assumed for deriving eight prediction modes, which are employed to select various types of DCT, Q, IQ, and IDCT implementations. The computed results indicate that the proposed algorithm is capable of reducing the number of DCT, Q, IQ, and IDCT computations compared to those required by related methods, while retaining the coding performance of the original encoder. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/***.51.4.047404]

关键词： zero-quantized discrete cosine transform coefficient discrete cosine transform quantization advanced video coding

来源：评论

学校读者我要写书评

暂无评论

Two-step regionally focused algorithm for H.264/AVC encoder

引用

IETE TECHNICAL REVIEW 2013年第4期30卷 280-285页

作者： Bharanitharan, K. Chen, Bo-Wei Chang, Chin-Chen Feng Chia Univ Dept Elect Engn Taichung 40724 Taiwan Natl Cheng Kung Univ Dept Elect Engn Taichung Taiwan Feng Chia Univ Dept Informat Engn & Comp Sci Taichung 40724 Taiwan Asia Univ Dept Comp Sci & Informat Engn Taichung Taiwan

H.264, MPEG-4 Part 10, is the latest digital video coding standard that achieves very high data compression by using several new coding features. One of the key features is the intra prediction based on the rate-distortion optimization (RDO) procedure, which requires a true encoding of the intra block by trying all intra prediction modes. The computational burden of intra prediction with the RDO procedure is extremely high for real-time applications. In this paper, we propose a classified block type algorithm that selects the -appropriate intra block size and further our proposed two-step regionally focused algorithm selected block that reduces a number of candidate mode required for RDO which significantly reduces the encoder complexity. Experimental results show that the proposed fast mode decision algorithm reduces the encoding time by about 68%, with negligible loss of video quality.

关键词： Edge detection Fast algorithm H.264 advanced video coding Intra prediction

来源：评论

学校读者我要写书评

暂无评论

A simplified 8 x 8 transformation and quantization real-time IP-block for mpeg-4 H.264/AVC applications: A new design flow approach

引用

JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS 2007年第6期16卷 1011-1026页

作者： Amer, Ihab Badawy, Wael Jullien, Graham Mattavelli, Marco Turney, Robert Univ Calgary ATIPS Calgary AB T2N 1N4 Canada Ecole Polytech Fed Lausanne Signal Proc Inst Signal Proc Lab 3 CH-1015 Lausanne Switzerland Xilinx Inc DSP Div DSP Syst Engn Watertown WI 53094 USA

Current multimedia design processes suffer from the excessively large time spent on testing new IP-blocks with references based on large video encoders specifications ( usually several thousands lines of code). The appropriate testing of a single IP-block may require the conversion of the overall encoder from software to hardware, which is dificult to complete in the short time required by the competition-driven reduced time-to-market demanded for the adoption of a new video coding standard. This paper presents a new design flow to accelerate the conformance testing of an IP-block using the H. 264/AVC software reference model. An example block of the simplified 8 x 8 transformation and quantization, which is adopted in FRExt, is provided as a case study demonstrating the effectiveness of the approach.

关键词： design flow H. 264 advanced video coding DCT hardware IP-block VLSI FPGA transform quantization SystemC rapid prototyping platform video coding

来源：评论

学校读者我要写书评

暂无评论

A proposed hardware reference model for spatial transformation and quantization in H.264

引用

JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2006年第2期17卷 533-552页

作者： Amer, Ihab Badawy, Wael Jullien, Graham ATIPS Calgary AB T2N 1N4 Canada

This paper presents three Very Large Scale Integration prototypes to exploit spatial redundancy in the H.264 standard. The proposed architectures are: (1) forward 4 x 4 integer approximation of DCT transform and quantization, which is applied to all blocks of a frame, (2) the 4 x 4 Hadamard transform and quantization that is applied to the DC coefficients of the luma component when the macroblock is encoded in 16 x 16 intra prediction mode, and (3) the 2 x 2 Hadamard transform and quantization that is applied to the DC coefficients of the chroma component as a second level in the transformation hierarchy. The developed algorithms are adopted by the H.264 standard. A performance analysis shows that the architectures satisfy the real-time constraints required by different digital video applications. (c) 2005 Elsevier Inc. All rights reserved.

关键词： H.264 advanced video coding DCT Hadamard hardware VLSI FPGA ASIC transform quantization video coding

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：