检索结果-内蒙古大学图书馆

Fast-efficient algorithm of high-profile intra prediction for H.264 encoding system

IET IMAGE PROCESSING 2018年第3期12卷 329-336页

作者： Hsia, Shih-Chang Wong, Wing-Kwong Shih, Yen-Hung Natl Yunlin Univ Sci & Technol Touliu Taiwan ACAD Tech Corp Touliu Taiwan

This study presents a fast intra-prediction algorithm for a high-profile H.264 encoder. First, a pre-decision algorithm is proposed to reject the impossible block size based on image variance. Then a fast 4x4 block prediction algorithm is proposed to select four possible modes from nine predicted modes based on the edge-filtering detection. With a hierarchical approach, the 8x8 block prediction is based on the result of the chosen 4x4 block mode. This approach selects only one to five modes of H.264 coding from nine prediction modes. Following the prediction of the 16x16 luminance block and 8x8 chrominance block is mapped by the result of the 8x8 luminance block by checking only one to two modes. The pre-decision algorithm, the fast 4x4, 8x8 and 16x16 block prediction algorithms can be combined to improve the coding speed. Simulations demonstrate that the proposed algorithm can save about 70% coding time at most for intra-frame coding in the H.264 system while increasing only about 1% bit-rate with a negligible peak signal-to-noise ratio drop.

关键词： video coding edge detection high-profile H 264 encoding system fast-efficient algorithm high-profile intra prediction fast intra-prediction algorithm pre-decision algorithm image variance block prediction algorithm edge-filtering detection prediction modes luminance block chrominance block intra-frame coding

来源：评论

学校读者我要写书评

暂无评论

Steganalysis of prediction mode modulated data-hiding algorithms in H.264/AVC video stream

引用

ANNALS OF TELECOMMUNICATIONS 2014年第7-8期69卷 461-473页

作者： Li, Songbin Deng, Haojiang Tian, Hui Dai, Qiongxing Chinese Acad Sci Inst Acoust Haikou Lab Haikou 570105 Peoples R China Natl Network New Media Engn Res Ctr Beijing 100085 Peoples R China Natl Huaqiao Univ Coll Comp Sci & Technol Xiamen 361021 Peoples R China

In the intra-frame coding of H.264/AVC, information hiding can be implemented by modulating the prediction modes of 4 x 4 luminance blocks. Because such kind of methods has characteristics of high speed, good concealment, and so on, it is very suitable to build the covert communication system based on video communications and brings a great public security threat. Therefore, it is important to study its steganalysis method. In this paper, we first analyzed the changes of remarkable characteristics in intra-frame coding caused by modulating intra-prediction modes for information hiding, and found that the inherent correlation among the prediction modes in different 4 x 4 luminance blocks belonging to an intra-frame coding macroblock was changed. According to several different positional relationships of the adjacent 4 x 4 blocks in spatial domain, we designed statistical models corresponding to the prediction mode correlation to make quantitative extraction of these correlation characteristics. An information hiding detector was constructed based on the support vector machine. Based on the constructed detector, the experimental results show that the mean of the detection accuracy, recall ratio, and precision ratio are all excellent for different test video sequences.

关键词： H.264/AVC Steganalysis intra-frame coding Prediction mode correlation

来源：评论

学校读者我要写书评

暂无评论

A LIGHT-WEIGHT HEVC ENCODER FOR IMAGE coding

A LIGHT-WEIGHT HEVC ENCODER FOR IMAGE CODING

引用

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

作者： Liang, Fei Peng, Xiulian Xu, Jizheng Univ Sci & Tech China MSRA MOE Joint Key Lab Hefei Peoples R China Microsoft Res Asia Beijing Peoples R China

ISBN: (纸本)9781479902880

High Efficiency Video coding (HEVC), not only provides a much better coding efficiency than previous video coding standards, but also shows significantly superior performance than other image coding schemes when applied to image coding. However, the improvement is at the cost of significant increase of encoding complexity. In this paper, we focus on retaining the high coding efficiency provided by HEVC while largely reducing its encoding complexity for image coding. By applying various techniques including optimized coding structure parameters, coding unit early termination, fast intra prediction and transform skip mode decision, we significantly reduce the complexity of HEVC intra coding while keeping most of its coding efficiency. Experimental results show that our light-weight HEVC encoder can save about 82% coding time compared with original HEVC encoder. With a slight loss to the HEVC reference software, the proposed scheme still gains about 19% in BD-BR compared with H.264/AVC.

关键词： HEVC image coding intra-frame coding

来源：评论

学校读者我要写书评

暂无评论

1080p 60 Hz intra-frame Video CODEC Chip Design and Its Implementation

引用

JOURNAL OF SIGNAL PROCESSING SYSTEMS FOR SIGNAL IMAGE AND VIDEO TECHNOLOGY 2012年第3期67卷 291-303页

作者： Song, Byung Cheol Yi, Yongseok Lee, Yun-Gu Kim, Nak-Hoon Ko, Jun Hyuk Kim, Tae Hee Lim, Dong Keun Ju, Woo Hyun Moon, Jae-Pil Cho, Kyunghwan Inha Univ Sch Elect Engn Inchon South Korea Samsung Elect Co Ltd Digital Media R&D Ctr Suwon South Korea Samsung Elect Co Ltd DMC R&D Ctr Suwon South Korea

This paper presents a 1080p 60 Hz intra-frame CODEC system for zero delay AV streaming. For high quality streaming, the proposed CODEC employs an RGB-domain inter-color compensation algorithm using strong correlation between RGB color components which was previously presented by the authors of this paper. The proposed CODEC architecture is based on macroblock-level pipelining and parallel processing to handle a significant pixel rate of 1080p 60 Hz videos with RGB 4: 4: 4 format, i.e., 3 Gbps. Since syntax processing is a bottleneck to supporting speeds of up to 100 Mbps in real-time, a high performance context-adaptive variable length coding architecture exploiting the look-ahead technique is included in the proposed design. Also, the number of syntax symbols is adaptively restricted to accomplish zero end-to-end delay. Finally, by using MPEG-2 TS as the AV stream format, compatibility with general channel chips is guaranteed. Using TSMC 90 nm CMOS technology, the prototype chip is implemented with 1,208 K logic gates and 359 Kb internal SRAM. The chip can achieve real-time encoding and decoding of 1080p 60 Hz videos at 200 MHz execution speed in typical work conditions.

关键词： RGB intra-frame coding Zero delay 1080p Full high definition TS

来源：评论

学校读者我要写书评

暂无评论

Performance analysis, parameter selection and extensions to H.264/AVC FRExt for high resolution video coding

引用

JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION 2011年第8期22卷 749-759页

作者： Deng, Chenwei Lin, Weisi Lee, Bu-sung Lau, Chiew Tong Sun, Ming-Ting Nanyang Technol Univ Singapore 639798 Singapore Univ Washington Seattle WA 98195 USA

H.264/AVC FRExt (Fidelity Range Extensions) and Motion JPEG 2000 are the current respective inter-frame and intra-frame coding standards for high resolution (HR) (e.g., 4096 x 2160) visual signals. It is commonly believed that an inter-frame method could achieve higher coding efficiency compared with an intra-frame one, due to the exploitation of video temporal redundancy. However, Motion JPEG 2000 has been selected as the digital cinema compression standard, and some existing work has demonstrated that JPEG 2000 is more suitable at HR situations. In this paper, we compare the rate-distortion (R-D) performance of these two different schemes and give more insight from both theoretical and experimental point of view. We derive an entropy-based R-D model to analyze the test results and the impact of residual entropy and quantization for inter-frame coding. Several extensions are introduced into H.264/AVC FRExt for HR video content for better performance. Experimental results show that these extensions lead to significantly higher coding efficiency and make our extended version more suitable for HR video coding (C) 2011 Elsevier inc. All rights reserved.

关键词： H.264/AVC FRExt Motion JPEG 2000 Video coding Inter-frame coding intra-frame coding High resolution Digital cinema Residual entropy

来源：评论

学校读者我要写书评

暂无评论

Screen image sequence compression method utilizing adaptive block size coding and hierarchical GOP structure

引用

Journal of Central South University 2010年第4期17卷 786-794页

作者：武星梅亮袭奇张申生陈延伟 School of Electronic Information and Electrical EngineeringShanghai Jiao Tong University Department of Electrical Engineering and Computer Science University of Michigan Joint Institute of University of Michigan-Shanghai Jiao Tong University Shanghai Jiao Tong University College of Information Science and Engineerin g Ritsumeikan University

To compress screen image sequence in real-time remote and interactive applications,a novel compression method is *** proposed method is named as *** employs hybrid coding schemes that consist of intra-frame and inter-frame coding *** intra-frame coding is a rate-distortion optimized adaptive block size that can be also used for the compression of a single screen *** inter-frame coding utilizes hierarchical group of pictures(GOP) structure to improve system performance during random accesses and fast-backward *** results demonstrate that the proposed CABHG method has approximately 47%-48% higher compression ratio and 46%-53% lower CPU utilization than professional screen image sequence codecs such as TechSmith Ensharpen codec and Sorenson 3 *** with general video codecs such as H.264 codec,XviD MPEG-4 codec and Apple's Animation codec,CABHG also shows 87%-88% higher compression ratio and 64%-81% lower CPU utilization than these general video codecs.

关键词： screen image sequence compression adaptive block size hierarchical GOP structure intra-frame coding inter-frame coding

来源：评论

学校读者我要写书评

暂无评论

Improved Line-based Image coding by Exploiting Long-Distance Correlations

Improved Line-based Image Coding by Exploiting Long-Distance...

引用

Conference on Visual Communications and Image Processing (VCIP)

作者： Peng, Xiulian Xu, Jizheng Wu, Feng Univ Sci & Technol China MSRA MOE Joint Key Lab Hefei Peoples R China Microsoft Res Asia Beijing Peoples R China

ISBN: (纸本)9780819482341

Line-based coding has shown its potential in improving the coding efficiency of intra-frame/ image coding due to its flexibility in prediction. In our previous work we proposed an efficient line-based image coding method (LIC) by adaptive line-by-line prediction (ALP) and adaptive residue coding. In this paper we further improve this line-based coding scheme by exploiting long-distance correlations in prediction. Line-by-line template matching (LTM) is introduced to perform the long-distance prediction. Experiments in the KTA software show that the LTM scheme can effectively improve the performance of LIC at low bitrates and also brings some improvement at high bitrates. Up to 1db gain is achieved compared to previous LIC and 1.5db compared to KTA on images with regular patterns or strong edges. Up to 20% rate reduction over KTA is also achieved on some standard video sequences with different resolutions.

关键词： image coding intra-frame coding prediction template matching

来源：评论

学校读者我要写书评

暂无评论

1080P 60HZ intra-frame CODEC BASED ON RGB COLOR SPACE FOR WIRELESS AV STREAMING

1080P 60HZ INTRA-FRAME CODEC BASED ON RGB COLOR SPACE FOR WI...

引用

16th IEEE International Conference on Image Processing

作者： Song, Byung Cheol Yi, Yongseok Lee, Yun-Gu Ko, Jun Hyuk Kim, Tae Hee Inha Univ Inchon South Korea Samsung Elect Co Ltd Seoul South Korea

ISBN: (纸本)9781424456536

To achieve high visual quality of intra-frame coding in order to minimize the visual quality degradation caused by color loss, the authors previously presented an RGB-domain inter-color compensation algorithm using strong correlation between RGB color components. Based on that inter-color compensation algorithm, this paper presents a 1080p 60Hz CODEC system architecture designed to process a bit-rate of up to approximately 100Mbps in real time. Both the encoding and decoding processes are pipelined on a macroblock level. Since syntax processing is a bottleneck to supporting speeds of up to 100Mbps, a high performance context-adaptive variable length coding architecture exploiting the look-ahead technique is included in the proposed design. The final chip implementation can achieve real-time encoding and decoding of 1080p 60Hz videos with reasonable hardware cost and operating clock frequency.

关键词： RGB intra-frame coding inter-color compensation 1080p 60Hz

来源：评论

学校读者我要写书评

暂无评论

DIRECTIONAL FILTERING TRANSFORM

DIRECTIONAL FILTERING TRANSFORM

引用

IEEE International Conference on Multimedia and Expo

作者： Peng, Xiulian Wu, Feng Xu, Jizheng Univ Sci & Technol China Hefei 230027 Peoples R China Microsoft Res Asia Beijing 100190 Peoples R China Shanghai Jiao Tong Univ Dept Elect Engn Inst Image Commun & Informat Proc Shanghai Peoples R China Shanghai Jiao Tong Univ Shanghai Key Lab Digital Media Proc & Transmiss Shanghai Peoples R China

ISBN: (纸本)9781424442904

This paper proposes the directional filtering transform (dFT, in order to distinguish from the common usage on DFT) to better exploit intra-frame correlation in H.264 intra-frame coding. It consists of a directional filtering and an optional DCT transform. In the proposed directional filtering, there are two different approaches. One is the uni-directional filtering (UDF) that is similar to H.264 directional intra prediction. In this approach, only samples from neighboring blocks can be used in prediction. Another is bidirectional filtering (BDF) that exploits the correlations among samples from not only neighboring blocks but also the current block. The prediction structure in this approach is hierarchical multi-layer. In this paper, we present mathematical analyses on UDF and BDF and show the advantage to combine them together. The proposed dFT is integrated into H.264 intra-frame coding too. The preliminary experimental results in H.264 demonstrate its superiority.

关键词： H.264 intra-frame coding directional filtering directional transform

来源：评论

学校读者我要写书评

暂无评论

Wyner Ziv codec design for surveillance system using adaptive puncturing rate

Wyner Ziv codec design for surveillance system using adaptiv...

引用

3rd IEEE International Symposium on Control, Communications and Signal Processing (ISCCSP 2008)

作者： Asif, Muhammad Soraghan, John J. Univ Strathclyde Dept Elect & Elect Engn Glasgow G1 1XW Lanark Scotland

ISBN: (纸本)9781424416875

A multiple camera surveillance system is typical example of a Distributed Video (DV) system with many-to-one topology which demands the use of new paradigm with multiple encoders, installed at number of locations and very few decoders in a control room. This paradigm open-up new frontiers for the research community in designing low cost encoders even at the cost of expensive decoders. A solution to this problem based on information theory finding of 70s, by Slepian and Wolf [3], for lossless encoding, and followed by the work of Wyner and Ziv [5], for lossy encoding. In the last few years there has been significant research activity in the design and implementation of video codec based on these findings. Our research work is also part of that effort. In this paper we will present a modified Wyner-Ziv codec, that take advantage of slow motion activity, which is typically of surveillance data. GOP is selected dynamically by accessing motion activity and also puncturing bit rate varies adaptively. Also the proposed architecture takes advantage of intra-frame coding for both key frame and Wyner-Ziv frames.

关键词： Wyner-Ziv Slepian and Wolf dynamic GOP adaptive parity bit intra-frame 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：