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检索条件"主题词=Screen content coding"

共 141 条记录，以下是121-130 订阅

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Exploiting Inter-layer Correlations in Scalable HEVC for the Support of screen content Videos 19

Exploiting Inter-layer Correlations in Scalable HEVC for the...

引用

19th International Conference on Digital Signal Processing (DSP)

作者： Tsang, Sik-Ho Chan, Yui-Lam Siu, Wan-Chi Hong Kong Polytech Univ Dept Elect & Informat Engn Ctr Signal Proc Kowloon Hong Kong Peoples R China

ISBN: (纸本)9781479946129

In this paper, we propose a scalable video coding (SVC) scheme for efficient coding of screen content videos while still providing the backward compatibility of HEVC (High Efficiency Video coding). By this means, the base layer is encoded as an HEVC-compatible bitstream while the enhancement layer is encoded with the proposed screen content coding (SCC) techniques for the support of screen content videos. For the enhancement layer, Base Colors plus Escape Colors (BCEC) approach is used in which a textual block is represented by base colors, escape colors and an index map. To further enhance the coding efficiency of enhancement layer, inter-layer intra prediction for BCEC is introduced by using index map differential coding and index map reuse techniques. Experimental results show that the proposed algorithm can achieve 8.0% bitrate reduction in average and up to 18.9% bitrate reduction for screen content video as compared with the conventional scalable HEVC.

关键词： HEVC Inter-layer Intra Prediction Scalable Video coding screen content coding Base Colors Escape Colors

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Current Picture Referencing mode with Affine Model in VVC 4

Current Picture Referencing mode with Affine Model in VVC

引用

4th IEEE International Conference on Signal and Image Processing (ICSIP)

作者： Cao, Siqi Han, Haiyang Liang, Fan Wang, Jun Liu, Hongmei Sun Yat Sen Univ Sch Data & Comp Sci Guangzhou 510006 Guangdong Peoples R China Sun Yat Sen Univ Sch Elect & Informat Technol Guangzhou 510006 Guangdong Peoples R China

ISBN: (纸本)9781728136608

The next video coding standard Versatile Video coding (VVC) is developing, and the current picture referencing (CPR) mode for processing screen content Video has been adopted in the third version of reference software Video Test Model (VTM3.0). It searches the block vector from the current block to the reference block in the same picture instead of searching the regular motion vector from the current picture to the reference picture. However, it only considers the translational motion compensation, using one vector to represent the movement of the whole block. To fit into more movements in the real world, intra prediction modes with affine motion model based on CPR mode called CPR-Affine mode is proposed in this paper innovatively. And it is the first to apply the affine motion model to intra prediction. First, choose the partial current picture to be the only reference picture, and the reference area must comply with some constraints to ensure that valid reference block can be obtained during decoding. Second, search a set of block-affine vectors (BVAffi) iteratively. BVAffi represents a set of the block vectors of the control points which is the top-left and the top-right corner samples of the current block, and the best BVAffi means the minimum predicted error after compensation. Meanwhile, in order to search the best BVAffi, establish one gradient filter with Sobel operation. The proposed algorithm in this paper is significant to introduce the affine motion model into intra prediction modes. Compared to VTM3.0 with CPR mode turning on, the experimental results demonstrate the efficiency of our proposed algorithm.

关键词： video coding intra prediction affine block vector screen content coding

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IMPROVED PALETTE INDEX MAP coding ON HEVC SCC 23

IMPROVED PALETTE INDEX MAP CODING ON HEVC SCC

引用

23rd IEEE International Conference on Image Processing (ICIP)

作者： Sun, Yu-Chen Chuang, Tzu-Der Kim, Jungsun Chen, Yi-Wen Liu, Shan Huang, Yu-Wen Lei, Shawmin MediaTek Inc Hsinchu Taiwan

ISBN: (纸本)9781467399616

Palette mode is the new coding tool that has been adopted in the screen content coding Extensions of High Efficiency Video coding (HEVC SCC). Palette mode can represent colour clusters for screen content efficiently and can be summarized into two parts: palette coding tools and colour index map coding tools. This paper proposes two techniques to improve colour index map coding: transition copy and prediction across coding unit boundary. The former is for exploring the correlation between an index and all of the previously coded indices;the latter for utilizing the correlation between the content along the coding unit boundary Experimental results reportedly show that, compared with HEVC SCC, the proposed techniques can achieve 3.2%, 2.2%, and 1.7% BD-rate savings compared with HEVC SCC for "YUV, text & graphics with motion, 1080p & 720p sequences" under all intra, random access, and low-delay B common test conditions, respectively.

关键词： screen content coding High Efficiency Video coding HEVC HEVC SCC Palette Mode

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INTRA BLOCK COPY IN AVS3 VIDEO coding STANDARD

INTRA BLOCK COPY IN AVS3 VIDEO CODING STANDARD

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Wang, Yingbin Xu, Xiaozhong Liu, Shan Tencent Media Lab Shenzhen Peoples R China

ISBN: (纸本)9781728114859

The popularity of screen content applications, such as WIFI display, online gaming, remote desktop sharing, has drawn more and more attentions in both industry and research communities. To address the need of high efficiency compression of such contents, some coding tools are designed specifically. Intra block copy (IBC), as one of the most efficient screen content oriented coding technologies, has been included in the new generation of AVS coding standard (AVS3). In this paper, the design of IBC mode in AVS3 standard is presented. Simulation results show that the proposed IBC mode achieves both reasonable low implementation complexity and high compression benefit.

关键词： AVS3 screen content coding intra block copy block vector prediction

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LOW COMPLEXITY IMPLEMENTATION OF INTRA STRING COPY IN AVS3

LOW COMPLEXITY IMPLEMENTATION OF INTRA STRING COPY IN AVS3

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Wang, Yingbin Xu, Xiaozhong Liu, Shan Tencent Media Lab Hangzhou Peoples R China

ISBN: (纸本)9781665449892

screen content coding has attracted extensive interests in both industry and academia with the popularity of screen content applications. In this paper, a low complexity implementation of infra string copy mode is proposed for screen content coding. The proposed intra string copy mode has been recently included in the latest AVS3 video coding standard. This paper presents the design of the proposed intra siring copy mode, where the main features designed for hardware friendly implementation are introduced and discussed. Simulation results show that the proposed intra string copy significantly improves the compression performance for screen content materials, while the implementation complexity is maintained at an acceptable level.

关键词： Intra String Copy Intra Block Copy AVS3 screen content coding Video coding

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Fast CU Partition Decision Using Machine Learning for screen content Compression

Fast CU Partition Decision Using Machine Learning for Screen...

引用

IEEE International Conference on Image Processing (ICIP)

作者： Duanmu, Fanyi Ma, Zhan Wang, Yao NYU Brooklyn NY 11201 USA Nanjing Univ Nanjing 210093 Jiangsu Peoples R China

ISBN: (纸本)9781479983391

screen content coding (SCC) extension is currently being developed by Joint Collaborative Team on Video coding (JCT-VC), as the final extension for the latest High-Efficiency Video coding (HEVC) standard. It employs some new coding tools and algorithms (including palette coding mode, intra block copy mode, adaptive color transform, adaptive motion compensation precision, etc.), and outperforms HEVC by over 40% bitrate reduction on typical screen contents. However, enormous computational complexity is introduced on encoder primarily due to heavy optimization processing, especially rate distortion optimization (RDO) for coding Unit (CU) partition decision and mode selection. This paper proposes a novel machine learning based approach for fast CU partition decision using features that describe CU statistics and sub-CU homogeneity. The proposed scheme is implemented as a "pre-processing" module on top of the screen content coding reference software (SCM-3.0). Compared with SCM-3.0, experimental results show that our scheme can achieve 36.8% complexity reduction on average with only 3.0% BD-rate increase over 11 JCT-VC testing sequences when encoded using "All Intra" (AI) configuration.

关键词： screen content coding HEVC Machine Learning Neural Network Partition Decision

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FEATURE FUSION ENHANCED SUPER RESOLUTION FOR LOW BITRATE screen content COMPRESSION 30

FEATURE FUSION ENHANCED SUPER RESOLUTION FOR LOW BITRATE SCR...

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30th IEEE International Conference on Image Processing (ICIP)

作者： Tang, Tong Zhang, Xin Li, Zhidu Yang, Jing Chongqing Univ Posts & Telecommun Sch Commun & Informat Engn Chongqing Peoples R China Key Lab Chongqing Educ Commiss China Adv Network & Intelligent Interconnect Technol Chongqing Peoples R China Chongqing Key Lab Ubiquitous Sensing & Networking Chongqing Peoples R China

ISBN: (纸本)9781728198354

screen content image/video has been widely applied into cloud game, AR/VR, online education etc., while the transmission and storage of screen content data is limited, and existing compression methods tend to lose details when encoding screen content with low bitrate. To address this challenge, a low bitrate screen content compression method based on super-resolution is proposed in this paper. The method combines super-resolution (SR) and down-sampling techniques to compress screen content while preserving its details. A novel super-resolution network is designed, which enhances detail preservation during feature fusion and eliminates compression distortion artifacts. The proposed method was evaluated against the state-of-the-art HEVC-SCC and can save bit rate by 19.77% and 26.18% on the SCID and SIQAD datasets, respectively while maintaining similar subjective quality.

关键词： screen content coding super resolution high efficiency video coding (HEVC)

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IMPROVEMENT OF RE-SAMPLE TEMPLATE MATCHING FOR LOSSLESS screen content VIDEO

IMPROVEMENT OF RE-SAMPLE TEMPLATE MATCHING FOR LOSSLESS SCRE...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Tao, Pin Feng, Lixin Song, Sichao Wen, Jiangtao Yang, Shiqiang Tsinghua Univ Pervas Lab TNList Dept Comp Sci & Technol Beijing Peoples R China

ISBN: (纸本)9781479970827

screen content (SC) video coding becomes more important for screen sharing and screen broadcasting applications. There are many easy to see different characters between screen content video and camera-captured video. We proposed a template matching prediction method for lossless SC intra picture coding with higher compression ratio. The pixels are re-sampled to form the Virtual Largest coding Unit (VLCU) firstly. About 80% pixels in VLCU can be predicted exactly by template matching with zero error. Then, pixels with non-zero prediction error should be coded with three information, index, position and value. Among these three, position will consume the most bits than the other two. In order to handle this challenge, we propose to apply the similarity of non-zero prediction error pixel positions of neighbor VLCU which can greatly help to improve the compression performance. The VLCU can be divided into sub CU as the same as the division in the standard High Efficiency Video coding(HEVC) intra coding, and RDO is applied to find the best coding efficiency.

关键词： screen content coding Template Matching Lossless Compression High Efficiency Video coding

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FAST INTRA MODE DECISION AND BLOCK MATCHING FOR HEVC screen content COMPRESSION 41

FAST INTRA MODE DECISION AND BLOCK MATCHING FOR HEVC SCREEN ...

引用

41st IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Zhang, Hao Zhou, Qiao Shi, Ningning Yang, Feng Feng, Xin Ma, Zhan Cent South Univ Changsha Hunan Peoples R China Nanjing Univ Nanjing Jiangsu Peoples R China Chongqing Univ Technol Chongqing Peoples R China

ISBN: (纸本)9781479999880

screen content coding (SCC) is the latest extension of the High-Efficiency Video coding (HEVC) aiming to improve the compression efficiency of screen content video. With newly developed tools such as intra block copy (IntraBC) and palette (PLT) mode, SCC has been able to compress the desktop screens more efficiently but with significant complexity increase. In this paper, we improve the intra prediction from two aspects. Firstly, by leveraging the temporal correlation among coding units (CU), we develop a fast CU depth prediction scheme. Furthermore, adaptive search step is employed for further speed up of the time-consuming block matching in IntraBC. The overall encoding time is reduced by about 39% and 35% for the All Intra (AI) lossy and lossless encoding scenarios with negligible quality loss under the SCC common test condition.

关键词： Intra mode intra block copy screen content coding HEVC

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Analysis of Palette Mode on Versatile Video coding 2

Analysis of Palette Mode on Versatile Video Coding

引用

2nd IEEE International Conference on Multimedia Information Processing and Retrieval (MIPR)

作者： Sun, Yu-Chen Lou, Jian Chao, Yung-Hsuan Wang, Hongtao Seregin, Vadim Karczewicz, Marta Alibaba Grp US Inc New York NY 10036 USA Qualcomm Technol Inc San Diego CA USA

ISBN: (纸本)9781728111988

The next generation video compression standard, Versatile Video coding (VVC), is being developed by the ITU-T/ISO/IEC Joint Video Experts Team (JVET). screen content coding is one of the target applications of the new standard. Palette mode has been investigated in the previous standard, High Efficient Video coding screen content coding Extension (HEVC-SCC), and can efficiently compress color clusters in screen content. This paper evaluates the palette mode on VVC. With the proposed modifications, the palette mode can achieve 33.1%, 16.6%, and 8.8% BD-rate saving for "YUV, text & graphics sequences" under all intra (AI), random access (RA), and low-delay B (LB) common test conditions, respectively.

关键词： Palette Mode Versatile Video coding (VVC) screen content coding

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