检索结果-内蒙古大学图书馆

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

Enhancing SVT-AV1 with LCEVC to improve quality-cycles trade-offs and enhance sustainability of VOD transcoding 45

Enhancing SVT-AV1 with LCEVC to improve quality-cycles trade...

引用

Applications of Digital Image Processing XLV

作者： Cobianchi, Guendalina Meardi, Guido Poularakis, Stergios Walisiewicz, Alexei Abdelkafi, Omran Ben Amara, Foued Kossentini, Faouzi Stejerean, Cosmin Tmar, Hassene V Nova Ltd 20 Eastbourne Terrace London England Intel Corp Suite 700450 SW Marine Dr Vancouver BC V5X 0C3 Canada Meta Platforms 1 Hacker Way Menlo Pk CA USA

ISBN: (纸本)9781510654372;9781510654365

The trade-offs between compression performance and encoding complexity are key in software video encoding, even more so with increasing pressure on sustainability. Previous work "Towards much better SVT-AV1 quality-cycles trade-offs for VOD applications" [1] described three approaches of evaluating compression efficiency vs cycles trade-offs within a convex-hull framework using the Dynamic Optimizer (DO) algorithm developed in [2] [3] for VOD applications. In parallel, the new video codec enhancer LCEVC (Low complexity Enhancement Video Coding) [4], designed to provide gains in speed-quality trade-offs, has recently been standardized as MPEG-5 Part 2. The core idea of LCEVC is to use any video coding standard (such as AV1) as a base encoder at a lower resolution, and then reduce artifacts and reconstruct a full resolution output by combining the decoded low-resolution output with up to two low-complexity reconstruction enhancement sub-layers of the residual data. This paper starts by applying LCEVC to SVT-AV1 [5], as well as x264 [6] and x265 [7], while using two of the approaches presented in [1] to evaluate the resulting compression efficiency vs cycles trade-offs. The paper then discusses the benefits of LCEVC towards higher playback speed and lower battery power consumption when using AV1 software decoding. Results show that, with fast-encoding parameter selection using the discrete convex hull methodology, LCEVC improves the quality-cycles trade-offs for all the tested codecs and across the full complexity range. In the case of SVT-AV1, LCEVC yields a similar to 40% reduction in computations while achieving the same quality levels according to VMAF_NEG [8]. LCEVC also enlarges the set of mobile devices capable of playing HD as well as high-frame-rate content encoded with AV1 and extends mobile battery life by up to 50% with respect to state-of-the-art AV1 software decoding.

关键词： AV1 SVT-AV1 Low complexity Enhancement Video Coding (LCEVC) MPEG-5 Part 2 video compression video coding standard enhancement software codec multi-resolution video coding multi-layer encoding convex hull dynamic optimizer encoder complexity coding efficiency adaptive streaming

来源：评论

学校读者我要写书评

暂无评论

Optimization of CU Partition Based on Texture Degree in H.266/VVC

Optimization of CU Partition Based on Texture Degree in H.26...

引用

14th Annual Summit and Conference of the Asia-Pacific-Signal-and-Information-Processing-Association (APSIPA ASC)

作者： Tang, Jingyuan Sun, Songlin Beijing Univ Posts & Telecommun Beijing Peoples R China

ISBN: (数字)9786165904773

ISBN: (纸本)9786165904773

H.266/VVC, a new generation of video coding standard, has achieved great performance improvement compared with the previous generation of coding standard, but the Rate Distortion Optimization (RDO) process leads to the increase of intra coding time. In order to reduce the complexity of H.266/VVC, this paper proposes a Coding Unit (CU) early termination segmentation algorithm based on Laplacian operator. The algorithm uses the convolution of the original pixel luminance value and Laplacian operator to obtain the texture degree of each pixel, and calculates the sum of the texture degrees of three specific size of CUs. Among them, the three sizes of CUs correspond to three different thresholds respectively. While the texture degree of the current CU is less than or equal to the threshold corresponding to the CU size, it will be determined as a flat region and will not continue to split downward, which will save the encoding time. Finally, the performance of the algorithm is tested under the common test conditions recommended by JVET. The experimental results show that the algorithm is more effective for high-definition (HD) videos can reduce the encoding time by about 38.64% on average and 36.88% for HD videos under the all intra configuration. For HD videos the change of Y, U and V components of this model are 0.990%, 0.263% and 0%.

关键词： video coding H.266/VVC encoder complexity

来源：评论

学校读者我要写书评

暂无评论

Towards Much Better SVT-AV1 Quality-Cycles Tradeoffs for VOD Applications 44

Towards Much Better SVT-AV1 Quality-Cycles Tradeoffs for VOD...

引用

Conference Applications of Digital Image Processing XLIV

作者： Wu, Ping-Hao Katsavounidis, Ioannis Lei, Ryan Ronca, David Tmar, Hassene Abdelkafi, Omran Cheung, Colton Ben Amara, Foued Kossentini, Faouzi Facebook Menlo Pk CA USA Intel Corp Suite 700450 SW Marine Dr Vancouver BC V5X 0C3 Canada

ISBN: (数字)9781510645233

ISBN: (纸本)9781510645233;9781510645226

Software video encoders that have been developed based on the AVC, HEVC, VP9, and AV1 video coding standards have provided improved compression efficiency but at the cost of large increases in encoding complexity. As a result, there is currently no software video encoder that provides competitive quality-cycles tradeoffs extending from the AV1 high-quality range to the AVC low-complexity range. This paper describes methods to further improve the SVT-AV1 overall quality-cycles tradeoffs for high-latency VOD applications. The paper first presents the latest SVT-AV1 encoder evaluation results generated using the conventional convex-hull-based evaluation approach. To better account for all the content being considered in the evaluation, the combined convex hull approach is then introduced and corresponding results outlined. A more practical version of the latter approach, referred to as the restricted discrete approach, is then presented. In this approach, only few discrete quality levels that are of relevance to typical adaptive streaming applications are considered. This restriction makes the evaluation data more relevant to real adaptive streaming applications and reduces the storage requirements for the encodings generated at the identified optimal encoder settings. A fast version of the latter approach is then presented, where the generation of the optimal encoder parameters is performed using a fast encoder, and the final encodings needed in the evaluation are generated using the desired encoder based on the identified optimal encoder parameters. These optimizations result in a complexity reduction by up to a factor of 10 for at most 1.5% loss in BD-rate.

关键词： AV1 SVT-AV1 Video compression Coding efficiency Adaptive streaming Convex hull Dynamic optimizer encoder complexity

来源：评论

学校读者我要写书评

暂无评论

Multilevel ML Assistance to High Efficiency Video Coding

Multilevel ML Assistance to High Efficiency Video Coding

引用

International Conference on Computer, Communication and Computational Sciences (IC4S)

作者： Pawar, Chhaya Shishir Sawarkar, SudhirKumar D. Datta Meghe Coll Engn Navi Mumbai Maharashtra India

ISBN: (纸本)9789811368615;9789811368608

High efficiency video coding (HEVC) standard also known as H.265 is an emerging international standard for video coding developed by joint collaborative team on video coding which is completed in January 2013. It provides around twice as much compression as H.264 for same the visual quality of the video. This bit rate reduction up to 50% comes with the increased complexity in encoder. The complexity is introduced mainly due to the additional angular modes for intraprediction, introduction of larger coding units and their flexible partitioning structure. HEVC encoders are expected to be much complex than H.264/AVC and will be an area of active research in future. This paper proposes a machine learning-based multilevel assistance to intra- and interprediction stage of video coding so as to reduce the computational complexity and avoid the huge wastage of computational efforts. Also brings the context awareness to improve the overall performance of the system.

关键词： HEVC encoder complexity Intraprediction Interprediction Video coding

来源：评论

学校读者我要写书评

暂无评论

Context-Based Ternary Tree Decision Method in Versatile Video Coding for Fast Intra Coding

引用

IEEE ACCESS 2019年 7卷 172597-172605页

作者： Park, Sang-Hyo Kang, Je-Won Ewha Womans Univ Dept Elect & Elect Engn Seoul 03760 South Korea

This paper presents a fast encoding method for versatile video coding (VVC) using an early determination scheme that skips redundant multi-type tree (MTT) pruning. MTT consists of binary and ternary trees (TTs) with traditional quadtrees and has recently attracted considerable VVC research interest due to coding efficiency beyond HEVC. However, the additional trees, particularly TTs, significantly increased VVC complexity, which has rarely been studied previously. Therefore, we identified TT characteristics in the VVC encoding context, and hence propose a simple early decision technique that can effectively reduce TT complexity. Experiments over various test sequences show that the proposed method substantially decreased the total encoding time for a VVC test model 4.0 (VTM 4.0) with only slight coding loss under the all-intra configuration. In particular, the proposed method reduced TT encoding time by up to 66% compared with VTM 4.0.

关键词： Versatile video coding high efficiency video coding multi-type tree encoder complexity intra-prediction

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

Efficient Reference Frame Selection Method for Lightweight HEVC encoder 8

Efficient Reference Frame Selection Method for Lightweight H...

引用

8th IEEE International Conference on Consumer Electronics - Berlin (ICCE-Berlin)

作者： Park, Sang-hyo Jeong, Jinwoo Kim, Sungjei Kim, Yong-Hwan Yonsei Univ Barun ICT Res Ctr Seoul South Korea Korea Elect Technol Inst Intelligent Image Proc Res Ctr Seongnam Si Gyeonggi Do South Korea

ISBN: (纸本)9781538660959

As a demand of video resolution increases highly, video encoder can face difficulties on the computational complexity to process huge pixel data with real-time environment. Many researches have focused on the complexity of high efficiency video coding (HEVC) test model (i.e., HM) which is far from real-time encoding for even high-definition video. However, it has been rarely studied in literature to establish a lightweight HEVC test model (LHM) and to decrease the complexity of LHM further. In this paper, LHM that equips fast encoding options is newly established, and a fast motion estimation (ME) method is proposed to challenge decreasing the encoding complexity of LHM. The proposed method exploits the intriguing correlation of the motion information of merge/skip mode with the information of other motion partitions to minimize the required number of reference frames in ME process. Experimental results showed that the proposed method could substantially decrease the complexity of LHM in view of encoding time as well as memory access.

关键词： HEVC motion estimation encoder complexity multiple reference frame

来源：评论

学校读者我要写书评

暂无评论

Low complexity reference frame selection in QTBT structure for JVET future video coding

Low complexity reference frame selection in QTBT structure f...

引用

International Workshop on Advanced Image Technology (IWAIT)

作者： Park, Sang-hyo Dong, Tianyu Jang, Euee S. Korea Elect Technol Inst Commun & Media R&D Div Seongnam Gyeonggi Do South Korea Hanyang Univ Dept Comp Sci Seoul South Korea

ISBN: (纸本)9781538626153

In this paper, we propose a reference frame search method for JVET future video codec (FVC) that employs the quadtree plus binary tree (QTBT) structure. Among many new technologies proposed in FVC, QTBT poses a significant challenge since it contains the structural change of coding tree unit from HEVC. To reduce the encoding complexity of FVC with QTBT structure, we investigated some redundancy in motion estimation process particularly, the reference frame search. In this paper, we present a method that effectively restricts the reference frame search range of general motion estimation as well as of affine motion estimation, exploiting the dependence within QTBT structure. The proposed method minimizes the maximum of the reference frame search ranges per each coding unit (CU) based on the prediction information of parents node. To be specific, the prediction direction and the index of reference frame of parent node were used. In addition, the proposed method utilizes the information of binary tree depth and of temporal layer to prevent undesired coding loss. The experimental results showed that the proposed method decreased the encoding time of motion estimation by 34% on average in comparison with joint exploration test model (JEM) 3.1, maintaining a reasonable coding efficiency (less than a 0.3% BD rate loss).

关键词： FVC JEM video coding video compression motion estimation reference frame search encoder complexity

来源：评论

学校读者我要写书评

暂无评论

Efficient biprediction decision scheme for fast high efficiency video coding encoding

引用

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

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：