检索结果-内蒙古大学图书馆

Low-Complexity scalable Extension of the High-Efficiency video coding (SHVC) Encoding System

ACM TRANSACTIONS ON MULTIMEDIA COMPUTING COMMUNICATIONS AND APPLICATIONS 2019年第2期15卷 44-44页

作者： Shen, Liquan An, Ping Feng, Guorui Shanghai Univ Key Lab Specialty Fiber Opt & Opt Access Networks Shanghai 200444 Peoples R China Shanghai Univ Shanghai Inst Adv Commun & Data Sci Shanghai 200444 Peoples R China

The scalable extension of the high-efficiency video coding (SHVC) system adopts a hierarchical quadtree-based coding unit (CU) that is suitable for various texture and motion properties of videos. Currently, the test model of SHVC identifies the optimal CU size by performing an exhaustive quadtree depth-level search, which achieves a high compression efficiency at a heavy cost in terms of the computational complexity. However, many interactive multimedia applications, such as remote monitoring and video surveillance, which are sensitive to time delays, have insufficient computational power for coding high-definition (HD) and ultra-highdefinition (UHD) videos. Therefore, it is important, yet challenging, to optimize the SHVC coding procedure and accelerate video coding. In this article, we propose a fast CU quadtree depth-level decision algorithm for inter-frames on enhancement layers that is based on an analysis of inter-layer, spatial, and temporal correlations. When motion/texture properties of coding regions can be identified early, a fast algorithm can be designed for adapting CU depth-level decision procedures to video contents and avoiding unnecessary computations during CU depth-level traversal. The proposed algorithm determines the motion activity level at the treeblock size of the hierarchical quadtree by utilizing motion vectors from its corresponding blocks at the base layer. Based on the motion activity level, neighboring encoded CUs that have larger correlations are preferentially selected to predict the optimal depth level of the current treeblock. Finally, two parameters, namely, the motion activity level and the predicted CU depth level, are used to identify a subset of candidate CU depth levels and adaptively optimize CU depth-level decision processes. The experimental results demonstrate that the proposed scheme can run approximately three times faster than the most recent SHVC reference software, with a negligible loss of compression efficiency. T

关键词： SHVC scalable video coding mode decision inter-layer correlation low-complexity

来源：评论

学校读者我要写书评

暂无评论

An HEVC Extension for Spatial and Quality scalable video coding

An HEVC Extension for Spatial and Quality Scalable Video Cod...

引用

Conference on Visual Information Processing and Communication IV

作者： Hinz, Tobias Helle, Philipp Lakshman, Haricharan Siekmann, Mischa Stegemann, Jan Schwarz, Heiko Marpe, Detlev Wiegand, Thomas Heinrich Hertz Inst Nachrichtentech Berlin GmbH Fraunhofer Inst Telecommun D-10587 Berlin Germany

ISBN: (纸本)9780819494399

This paper describes an extension of the upcoming High Efficiency video coding (HEVC) standard for supporting spatial and quality scalable video coding. Besides scalable coding tools known from scalable profiles of prior video coding standards such as H.262/MPEG-2 video and H.264/MPEG-4 AVC, the proposed scalable HEVC extension includes new coding tools that further improve the coding efficiency of the enhancement layer. In particular, new coding modes by which base and enhancement layer signals are combined for forming an improved enhancement layer prediction signal have been added. All scalable coding tools have been integrated in a way that the low-level syntax and decoding process of HEVC remain unchanged to a large extent. Simulation results for typical application scenarios demonstrate the effectiveness of the proposed design. For spatial and quality scalable coding with two layers, bit-rate savings of about 20-30% have been measured relative to simulcasting the layers, which corresponds to a bit-rate overhead of about 5-15% relative to single-layer coding of the enhancement layer.

关键词： HEVC scalable video coding spatial scalability quality scalability

来源：评论

学校读者我要写书评

暂无评论

ON SECONDARY TRANSFORMS FOR scalable video coding

ON SECONDARY TRANSFORMS FOR SCALABLE VIDEO CODING

引用

IEEE International Conference on Visual Communications and Image Processing (VCIP)

作者： Saxena, Ankur Fernandes, Felix C. Samsung Telecommun Amer Richardson TX 75082 USA

ISBN: (纸本)9781479902880

In this paper, we present a secondary transform scheme for inter-layer prediction residue in scalable video coding (SVC). Efficient prediction of the co-located blocks from the base layer (BL) can significantly improve the enhancement layer (EL) coding in SVC, especially when the temporal information from previous EL frames is less correlated than the co-located BL information. However, Guo et al. showed that because of the peculiar frequency characteristics of EL residuals, the conventional DCT Type-2 transform is suboptimal and is often outperformed by either the DCT Type-3, or DST Type-3 when these transforms are applied to the EL residuals. However, their proposed technique requires upto 8 additional transform cores, two of which are of size 32x32. Here, in this work, we propose a secondary transform scheme, where the proposed transform is applied only to the lower 8x8 frequency coefficients after DCT, for block sizes 8x8 to 32x32. Our proposed transform scheme requires at most only 2 additional cores. We also propose a low-complexity 8x8 Rotational Transform as a special case of secondary transforms in this paper. Simulation results show that the proposed transform scheme provides significant BD-Rate improvement over the conventional DCT-based coding scheme for video sequences in the ongoing scalable extensions of HEVC standardization.

关键词： video compression secondary transform DCT scalable video coding HEVC

来源：评论

学校读者我要写书评

暂无评论

A scalable video coding Extension of HEVC

A Scalable Video Coding Extension of HEVC

引用

Data Compression Conference (DCC)

作者： Helle, Philipp Lakshman, Haricharan Siekmann, Mischa Stegemann, Jan Hinz, Tobias Schwarz, Heiko Marpe, Detlev Wiegand, Thomas Heinrich Hertz Inst Nachrichtentech Berlin GmbH Fraunhofer Inst Telecommun Berlin Germany

ISBN: (纸本)9781467360371

The paper describes a scalable video coding extension of the upcoming HEVC video coding standard for spatial and quality scalable coding. Besides coding tools known from scalable profiles of prior video coding standards, it includes new coding tools that further improve the enhancement layer coding efficiency. The effectiveness of the proposed scalable HEVC extension is demonstrated by comparing the coding efficiency to simulcast and single-layer coding for several test sequences and coding conditions.

关键词： HEVC quality scalability scalable video coding spatial scalability

来源：评论

学校读者我要写书评

暂无评论

FlexDiT: Dynamic Token Density Control for Diffusion Transformer

arXiv

引用

arXiv 2024年

作者： Chang, Shuning Wang, Pichao Tang, Jiasheng Yang, Yi Zhejiang University China Alibaba Group China

Diffusion Transformers (DiT) deliver impressive generative performance but face prohibitive computational demands due to both the quadratic complexity of token-based self-attention and the need for extensive sampling steps. While recent research has focused on accelerating sampling, the structural inefficiencies of DiT remain underexplored. We propose FlexDiT, a framework that dynamically adapts token density across both spatial and temporal dimensions to achieve computational efficiency without compromising generation quality. Spatially, FlexDiT employs a three-segment architecture that allocates token density based on feature requirements at each layer: Poolingformer in the bottom layers for efficient global feature extraction, Sparse-Dense Token Modules (SDTM) in the middle layers to balance global context with local detail, and dense tokens in the top layers to refine high-frequency details. Temporally, FlexDiT dynamically modulates token density across denoising stages, progressively increasing token count as finer details emerge in later timesteps. This synergy between FlexDiT’s spatially adaptive architecture and its temporal pruning strategy enables a unified framework that balances efficiency and fidelity throughout the generation process. Our experiments demonstrate FlexDiT’s effectiveness, achieving a 55% reduction in FLOPs and a 175% improvement in inference speed on DiT-XL with only a 0.09 increase in FID score on 512×512 ImageNet images, a 56% reduction in FLOPs across video generation datasets including FaceForensics, SkyTimelapse, UCF101, and Taichi-HD, and a 69% improvement in inference speed on PixArtα on text-to-image generation task with a 0.24 FID score decrease. FlexDiT provides a scalable solution for high-quality diffusion-based generation compatible with further sampling optimization techniques. Code will be available at https://***/changsn/FlexDiT. Copyright © 2024, The Authors. All rights reserved.

关键词： scalable video coding

来源：评论

学校读者我要写书评

暂无评论

Improving scalable video coding Performance with Decoder Side Information

Improving Scalable Video Coding Performance with Decoder Sid...

引用

Picture coding Symposium (PCS)

作者： HoangVan, Xiem Ascenso, Joao Pereira, Fernando Inst Super Tecn Inst Telecomunicacoes Lisbon Portugal Inst Super Engn Lisboa Inst Telecomunicacoes Lisbon Portugal

ISBN: (纸本)9781479902941

In a heterogeneous landscape of networks, devices and consumption environments, scalability is one of the most important video coding features. To achieve higher scalable video compression efficiency, this paper proposes a novel scalable video coding framework based on predictive video coding but also exploiting some additional decoder side information. The side information is estimated at both encoder and decoder using a motion compensated temporal interpolation technique, commonly used in distributed video coding solutions. To improve the B-slices compression efficiency, the side information independently created at each coding layer, notably the base and enhancement layers, is inserted in the corresponding layer decoded picture buffer to be exploited as an additional reference frame in the scalable predictive coding process. Experimental results have shown significant compression efficiency gains, notably up to around 3.5% in bitrate savings regarding the state-of-the-art SVC standard.

关键词： scalable video coding

来源：评论

学校读者我要写书评

暂无评论

An Adaptive Rate Control Scheme for H.264 scalable video coding

An Adaptive Rate Control Scheme for H.264 Scalable Video Cod...

引用

International Conference on Green Computing, Communication and Conservation of Energy (ICGCE)

作者： Balaji, L. Thyagharajan, K. K. Velammal Inst Technol Dept ECE Madras Tamil Nadu India Anna Univ Madras 600025 Tamil Nadu India RMD Engn Coll Madras Tamil Nadu India

ISBN: (纸本)9781467361255

Rate Control plays an important role in video coding, which performs successful transmission of all encoded bits with available limited bandwidth. This paper aims to provide an adaptive rate controller for H. 264 scalable video coding. The Quantization Parameter (QP) plays an important role in any rate controller for encoding demanded bits. The Quantization parameter estimation and the rate controller algorithm follows two pass 1) Initial Quantization Parameter value estimated by simplified Rate Distortion model using Cauchy Density based PDF and Buffer status 2) Rate Distortion Optimization method to determine minimum cost for the mode and motion vector using the estimated Quantization Parameter. The experimental result shows that our rate control algorithm is better than the FixedQPencoder of JSVM 9.19.15 in terms of PSNR and bit rate. Moreover our scheme performs in single iteration to encode the frame with the desired QP and Buffer status calculated to prevent from overflow and underflow.

关键词： H.264/SVC Rate control RDO scalable video coding Cauchy - Density PDF

来源：评论

学校读者我要写书评

暂无评论

A wireless video transmission scheme based on network coding and scalable video coding

A wireless video transmission scheme based on network coding...

引用

7th International Conference on Signal Processing and Communication Systems (ICSPCS)

作者： Feng, Dechun Gao, Shaoshuai Univ Chinese Acad Sci Sch Elect Elect & Commun Engn Beijing 100049 Peoples R China

ISBN: (纸本)9781479913190

video streaming over wireless network has a very broad application prospect. However, the quality of video will be seriously deteriorated due to the nature of time-varying and noisy wireless channels. In this paper, we propose a wireless video streaming method based on network coding and scalable video coding (SVC). In order to maximize the throughput and video quality simultaneously, a forwarding node should mix the data packets from different streams and flows according to their importance values, which are provided directly by a SVC-coded video stream. Simulation results show that our method can improve both video quality and throughput significantly.

关键词： scalable video coding Network coding video streaming data packets Throughput videotapes video transmission wireless Wireless networks video coding Relaxation time

来源：评论

学校读者我要写书评

暂无评论

An Early Mode Decision Algorithm For the Enhancement Layers in H.264 scalable video coding

An Early Mode Decision Algorithm For the Enhancement Layers ...

引用

International Conference on Information Technology and Management Innovation (ICITMI2012)

作者： Yuan, Chun Xu, Bolin Tsinghua Univ Grad Sch Shenzhen Informat Sci & Technol Div Shenzhen 518055 Peoples R China

ISBN: (纸本)9783037855744

This paper presents a early mode decision algorithm, which is proposed to reduce the complexity of the mode selection process for enhancement layers in H.264 scalable video coding. The proposed algorithm consists of the following three main steps. We firstly divide all the macroblocks into 4 classes according to the mode of collocated macroblocks in the base layer. Then, the macroblocks are subdivided with trained BP (Back Propagation) network according to the mode of neighboring macroblocks. Finally, we choose different mode selection algorithms for different divided cases, and check whether the algorithms are agreeable. Compared to JSVM 9.18, experiment results show that, with this algorithm, 30% encoding time can be saved with a negligible loss in BDSNR, and BDBR can be significantly reduced.

关键词： H.264 scalable video coding Fast Mode Decision Early Termination Statistics Machine Learning

来源：评论

学校读者我要写书评

暂无评论

Content-Adaptive Upsampling for scalable video coding

Content-Adaptive Upsampling for Scalable Video Coding

引用

Picture coding Symposium (PCS)

作者： Zhao, Jie Misra, Kiran Segall, Andrew Sharp Labs Amer Camas WA 98607 USA

ISBN: (纸本)9781479902941

In the developing scalable extension of the HEVC/H. 265 standard, a low-resolution baselayer picture may be used for predicting a higher resolution enhancement layer. This requires an upsampling process to generate the prediction, and this upsampling process is traditionally a linear and time invariant interpolator. In this paper, we consider an upsampling design that is both non-linear and content adaptive. This choice is motivated by the compression noise in the baselayer. We propose a novel approach to include content-aware filtering into the upsampling process. It has low complexity. More importantly, it has low latency and uses the same number of line buffers as a linear interpolator. Results show the efficacy of the method. Specifically, using the test model for the scalable extension of HEVC/H.265, we observe an average bit-rate reduction of 1.1%, when the change in resolution between layers is a factor of two in each dimension.

关键词： upsampling scalable video coding experimental model video coding numerical invariant bit rate reduction

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：