检索结果-内蒙古大学图书馆

Efficient biprediction decision scheme for fast high efficiency video coding encoding

JOURNAL OF ELECTRONIC IMAGING 2016年第6期25卷 1-8页

作者： Park, Sang-hyo Lee, Seung-ho Jang, Euee S. Jun, Dongsan Kang, Jung-Won Hanyang Univ Digital Media Lab 222 Wangsimni Ro Seoul 04763 South Korea ETRI Broadcasting Media Res Lab 218 Gajeong Ro Daejeon 34129 South Korea

An efficient biprediction decision scheme of high efficiency video coding (HEVC) is proposed for fastencoding applications. For low-delay video applications, bidirectional prediction can be used to increase compression performance efficiently with previous reference frames. However, at the same time, the computational complexity of the HEVC encoder is significantly increased due to the additional biprediction search. Although a some research has attempted to reduce this complexity, whether the prediction is strongly related to both motion complexity and prediction modes in a coding unit has not yet been investigated. A method that avoids most compression-inefficient search points is proposed so that the computational complexity of the motion estimation process can be dramatically decreased. To determine if biprediction is critical, the proposed method exploits the stochastic correlation of the context of prediction units (PUs): the direction of a PU and the accuracy of a motion vector. Through experimental results, the proposed method showed that the time complexity of biprediction can be reduced to 30% on average, outperforming existing methods in view of encoding time, number of function calls, and memory access. (C) 2016 SPIE and IS&T

关键词： high efficiency video coding encoder complexity biprediction search bidirectional motion estimation

来源：评论

学校读者我要写书评

暂无评论

Feature-based intra-/intercoding mode selection for H.264/AVC

引用

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2007年第4期17卷 441-453页

作者： Kim, Changsung Kuo, C. -C. Jay QUALCOMM MediaFLO Technol San Diego CA 92121 USA Univ So Calif Dept Elect Engn Los Angeles CA 90089 USA Univ So Calif Integrated Media Syst Ctr Los Angeles CA 90089 USA

A fast feature-based intra/inter coding mode selection scheme for the H.264/AVC video coding standard is proposed in this paper. First, three features are extracted from a macroblock to form a feature space. Then, the feature space is partitioned into three regions, i.e., risk-free, risk-tolerable, and risk-intolerable regions, where the risk is calculated using the rate-distortion (RD) performance loss due to wrong mode decision as well as the probability distribution of inter/intra modes in the feature space obtained from an off-line training process. Depending on the region where the feature vector of a macroblock is located, we can apply mechanisms of different complexity for final mode decision. To calculate the likelihood function of the risk, both parametric and non-parametric density estimation schemes are developed to offer different rate-distortion-complexity tradeoffs. It is demonstrated by experimental results that the proposed algorithm can save approximately 20%-32% of the total encoding time of H.264 (JM7.3a) with little degradation in the rate-distortion performance.

关键词： Bayes-risk minimization coding mode prediction density estimation encoder complexity H264/AVC mode decision

来源：评论

学校读者我要写书评

暂无评论

Distributed source coding using symbol-based and non-binary turbo codes - applications to wireless sensor networks

引用

IET COMMUNICATIONS 2008年第8期2卷 1089-1097页

作者： Zamani, Mahdi Lahouti, Farshad Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada Univ Tehran Sch Elect & Comp Engn Ctr Excellence Appl Electromagnet Syst Tehran Iran

A simple but powerful scheme for distributed source coding (DSC) based on the concept of binning and syndromes and non traditional turbo codes is proposed. The previous works on the compression with side information using turbo codes and the binning technique are focused on binary turbo codes. The source is considered to be binary or is converted to a binary stream. This conversion, however, reduces the redundancy that could be exploited by the compression algorithm. To achieve higher compression efficiency, the authors propose using a scheme based on a turbo decoder that decides over symbols rather than bits. In the same direction and for further performance improvement, at the cost of increased encoder complexity, they also present a DSC scheme based on non-binary turbo codes. The results demonstrate improved performance. Based on the suggested algorithms, a scheme for gathering real data in wireless sensor networks and assess the corresponding energy savings is proposed.

关键词： distributed source coding wireless sensor network wireless sensor networks source coding symbol-based turbo codes turbo decoder binary codes nonbinary turbo codes binary stream compression algorithm encoder complexity binning technique energy savings turbo codes

来源：评论

学校读者我要写书评

暂无评论

Adaptive merge list construction for 3D-HEVC fast encoder

引用

ELECTRONICS LETTERS 2016年第8期52卷 604-U90页

作者： Heo, Y. S. Bang, G. Park, G. H. Kyung Hee Univ Dept Comp Engn 1732 Deogyeong Daero Yongin 446701 Gyeonggi South Korea Elect & Telecommun Res Inst 218 Gajeong Ro Daejeon South Korea

Adaptive merge list construction for the fast encoder of three-dimensional high efficiency video coding (3D-HEVC) scheme is proposed in this Letter. The encoder complexity of 3D-HEVC has been unavoidably very high in comparison with HEVC, because it should handle the multiple view images and their corresponding depth images. Proposed method is designed to reduce the encoder-side computational complexity of the 3D-HEVC merging process through a fast decision with early termination arranged by two conditions. Simulation results show that the proposed method can reduce overall encoding time by 9.7% without coding losses in comparison with the recent 3D-HEVC HTM-14.0 fast encoder that consisted of every encoder optimisation algorithm informatively adopted in both HEVC and 3D-HEVC standardisation activities.

关键词： video coding optimisation computational complexity 3D-HEVC fast encoder adaptive merge list construction three-dimensional high efficiency video coding scheme encoder complexity 3D-HEVC merging process encoder optimisation algorithm

来源：评论

学校读者我要写书评

暂无评论

A systematic approach to the construction of bandwidth-efficient multidimensional trellis codes

引用

IEEE TRANSACTIONS ON COMMUNICATIONS 2000年第11期48卷 1808-1817页

作者： Dinh, TC Hashimoto, T Univ Electrocommun Dept Elect Engn Tokyo 2188585 Japan

We present a unified approach to the construction of multidimensional trellis codes that have small constellation expansion ratio (CER) and small peak-to-average power ratio (PAR) and hence are of high bandwidth efficiency. In the approach, we extend Wei's construction to dimensionalities other than a power of two and propose a low-complexity encoder. We also present a general partition technique that gives geometrically uniform partitions with a good distance profile. The proposed method can generate many good codes including previously reported Ungerboeck codes, Gallager-Calderbank-Sloane codes, and Wei codes with quadrature amplitude modulation signals. Some newly discovered six-dimensional trellis codes are compared with these known codes on their CER, PAR, effective coding gain, and encoder/decoder complexities.

关键词： constellation expansion ratio (CER) encoder complexity geometrically uniform (GU) multidimensional signal sets multidimensional trellis-coded modulation (MTCM) peak-to-average power ratio (PAR)

来源：评论

学校读者我要写书评

暂无评论

Benchmarking Hardware and Software encoder Quality and Performance 47

Benchmarking Hardware and Software Encoder Quality and Perfo...

引用

Conference on Applications of Digital Image Processing XLVII

作者： Tmar, Hassene Wu, Nick Stejerean, Cosmin Lei, Ryan Zhijun Katsavounidis, Ioannis Meta Platforms Inc 1 Hacker Way Menlo Pk CA 94025 USA

ISBN: (纸本)9781510679344;9781510679351

In this paper, we present a methodology for benchmarking the coding efficiency and energy efficiency of software and hardware video transcoding implementations. This study builds upon our previous work, which focused on software encoders such as x264, x265, libvpx, vvenc, and SVT-AV1. We have since added a closed-source video software encoder implementation, EVE-VP9, as well as Meta's MSVP VP9 encoder as a hardware representative, and expanded the test set to include a wider variety of test content in our analysis. To ensure a fair comparison between software and hardware encoders, we normalize the video encoding efficiency to energy used in watt-hours. Our proposed test methodology includes a detailed description of the process for measuring compression efficiency and energy consumption. We summarize limitations of our methodology and identify future opportunities for improvement.

关键词： Video compression Coding efficiency Adaptive streaming Convex hull Dynamic optimizer encoder complexity Hardware encoder

来源：评论

学校读者我要写书评

暂无评论

Fast intra-prediction model selection for H.264 CODEC

Fast intra-prediction model selection for H.264 CODEC

引用

Conference on Multimedia Systems and Applications VI

作者： Kim, CS Li, Q Kuo, CCJ Univ So Calif Integrated Media Syst Ctr Los Angeles CA 90089 USA

ISBN: (纸本)081945124X

We investigate the encoding speed improvement for H.264 with a special focus on fast intra-prediction mode selection in this work. It is possible to adopt the rate-distortion (RD) optimized mode in H.264 to maximize the coding gain at the cost of a very high computational complexity. To reduce the complexity associated with the intra-prediction mode selection, we propose a two-step fast algorithm. In the first step, we make a course-level decision to split all possible candidate modes into two groups: the group to be examined further and the group to be ignored. The sizes of these two groups are adaptively determined based on the block activities. Then, in the second step, we focus on the group of interest, and consider an RD model for final decision-making. It is demonstrated by experiment results that the proposed scheme performs 5 to 7 time faster than the current H.264 encoder (JM5.0c) with little degradation in the coding gain.

关键词： H.264/JVT intra prediction encoder complexity intra mode decision

来源：评论

学校读者我要写书评

暂无评论

Bayes-risk minimized intra/inter coding mode prediction for H.264

Bayes-risk minimized intra/inter coding mode prediction for ...

引用

Conference on Image and Video Communications and Processing 2005

作者： Kim, C Kuo, CCJ Univ So Calif Integrated Media Syst Ctr Los Angeles CA 90089 USA

ISBN: (纸本)0819456586

A feature-based coding mode prediction method is proposed to reduce the encoder complexity of the H.264 video coding standard in this work. The current H.264 reference codes employ exhaustive search to find the best mode that optimizes the rate-distortion performance among all possible intra/inter predictive modes. To develop a fast binary intra/inter-mode prediction scheme, we consider the expected risk of choosing the wrong mode in a multi-dimensional feature space. The proposed algorithm consists of three steps. First, three features are extracted from the current macroblock. Second, the expected risk is calculated for the corresponding partition in the trained feature vector space, which is used to decide where the feature vector lies in one of the three regions depending on the expected risk, i.e. risk-free, risk-tolerable, and risk-intolerable regions. Finally, depending on the region to which the feature vector belongs, we can apply mechanisms of different complexities for final mode decision. For the likelihood estimation of the risk, parametric and non-parametric density estimation schemes are compared in terms of the rate-distortion-complexity tradeoff. It is demonstrated by experimental results that the proposed algorithm can save approximately 20-32% of the total encoding time of H.264 (JM7.3a) with little degradation in the rate-distortion performance.

关键词： H.264/AVC coding mode prediction Bayes-risk minimization density estimation mode decision encoder complexity

来源：评论

学校读者我要写书评

暂无评论

Fast Line-Based Intra Prediction for Video Coding 20

Fast Line-Based Intra Prediction for Video Coding

引用

20th IEEE International Symposium on Multimedia (ISM)

作者： De-Luxan-Hernandez, Santiago Schwarz, Heiko Marpe, Detlev Wiegand, Thomas Fraunhofer HHI Video Coding & Analyt Berlin Germany

ISBN: (纸本)9781538668573

Intra prediction plays a very important role in current video coding technologies like the H.265/High Efficiency Video Coding (HEVC) standard, the Joint Exploration Test Model (JEM) and the upcoming Versatile Video Coding (VVC) standard. In previous work we proposed a Line-Based Intra Prediction algorithm to improve the state-of-art coding performance of HEVC and JEM. This method divides (horizontally or vertically) a block into lines and then it codes each of them individually in a sequential manner. At the encoder side, however, it is necessary to select an optimal combination of intra mode and 1-D split type in a Rate-Distortion sense. Since testing for every block all possible combinations of these two parameters would imply a very significant increase in the encoder complexity, this paper proposes several fast algorithms to reduce the number of tests and improve the overall trade-off between complexity and gain. The experimental results show a reduction of the encoder run-time from 322% to 166% in exchange for a loss of 0.34% for the All Intra configuration and from 151% to 116% for a loss of 0.15% in the case of Random Access.

关键词： Intra prediction Line-Based Intra Prediction (LIP) HEVC VTM encoder complexity Fast algorithms

来源：评论

学校读者我要写书评

暂无评论

complexity scalable motion estimation for H.264/AVC

Complexity scalable motion estimation for H.264/AVC

引用

Conferenceon Visual Communications and Image Processing 2006

作者： Kim, C Xin, J Vetro, A Kuo, CCJ Univ So Calif Dept Elect Engn Los Angeles CA 90089 USA

ISBN: (纸本)0819461172

A new complexity-scalable framework for motion estimation is proposed to efficiently reduce the motion-complexity of encoding process, with focus on long term memory motion-compensated prediction of the H.264 video coding standard in this work. The objective is to provide a complexity scalable scheme for the given motion estimation algorithm such that it reduces the encoding complexity to the desired level with insignificant penalty in rate-distortion performance. In principle, the proposed algorithm adaptively allocates available motion-complexity budget to macroblock based on estimated impact towards overall rate-distortion (RD) performance subject to the given encoding time limit. To estimate macroblock-wise tradeoff between RD coding gain (J) and motion-complexity (C), the correlation of J-C curve between current macroblock and collocated macroblock in previous frame is exploited to predict initial motion-complexity budget of current macroblock. The initial budget is adaptively assigned to each blocksize and block-partition successively and motion-complexity budget is updated at the end of every encoding unit for remaining ones. Based on experiment, proposed J - C slope based allocation is better than uniform motion-complexity allocation scheme in terms of RDC tradeoff. It is demonstrated by experimental results that the proposed algorithm can reduce the H.264 motion estimation complexity to the desired level with little degradation in the rate-distortion performance.

关键词： H.264/AVC complex scalable fast motion estimation encoder complexity motion-complexity allocation

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：