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Texture-Based Fast CU Size Decision and Intra Mode Decision Algorithm for VVC 26th

Texture-Based Fast CU Size Decision and Intra Mode Decision ...

引用

26th International Conference on MultiMedia Modeling (MMM)

作者： Cao, Jian Tang, Na Wang, Jun Liang, Fan Sun Yat Sen Univ Sch Elect & Informat Technol Guangzhou Peoples R China Sun Yat Sen Univ Sch Data & Comp Sci Guangzhou Peoples R China

ISBN: (纸本)9783030377311;9783030377304

Versatile Video Coding (VVC) is the next generation video coding standard. Compared with HEVC/H.265, in order to improve coding efficiency, its complexity of intra coding increases significantly. Too much encoding time makes it difficult for real-time coding and hardware implementation. To tackle this urgent problem, a texture-based fast CU size decision and intra mode decision algorithm is proposed in this paper. The contributions of the proposed algorithm include two aspects. (1) Aiming at the latest adopted QTMT block partitioning scheme in VVC, some redundant splitting tree and direction are skipped according to texture characteristics and differences between sub-parts of CU. (2) A fast intra mode decision scheme is proposed which considers complexity and texture characteristics. Some hierarchical modifications are applied including reducing the number of checked Intra Prediction Modes (IPM) and candidate modes in Rough Modes Decision (RMD) and RD check stage respectively. Compared with the latest VVC reference software VTM-4.2, the proposed algorithm can achieve approximately 46% encoding time saving on average with only 0.91% BD-RATE increase or 0.046 BD-PSNR decrease.

关键词： VVC Intra coding QTMT IPM encoding complexity

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Ultra-Lightweight CNN Based Fast Intra Prediction for VVC Screen Content Coding 56

Ultra-Lightweight CNN Based Fast Intra Prediction for VVC Sc...

引用

56th IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Tang, Tong You, Chuan Li, Zhidu Zhang, Ruoying Zou, Hong Chongqing Univ Posts & Telecommun Sch Commun & Informat Engn Chongqing Peoples R China Adv Network & Intelligent Interconnect Technol Ke Chongqing Peoples R China Chongqing Key Lab Ubiquitous Sensing & Networking Chongqing Peoples R China

ISBN: (纸本)9781665451093

Versatile Video Coding (VVC/H.266) greatly improves the compression performance at the cost of extremely high computational complexity compared with High Efficiency Video Coding (HEVC/H.265). Within the context of mobile devices with limited power and computational capabilities, reductions on encoding complexity are important;particularly to encode new data formats such as screen content sequences. Therefore, in this paper, aimed at two brand-new techniques with high complexity, matrix-weighted intra-prediction (MIP) and intra-sub-partition (ISP), we propose a fast intra-prediction scheme for VVC screen content coding based on ultra-lightweight convolutional neural network (CNN). Firstly, an ultra-lightweight CNN is designed to segment the image into the natural content region (NCR) and the screen content region (SCR). Then, an adaptive intra-coding mode pruning scheme based on the ultra-lightweight CNN is proposed to accelerate the VVC screen content coding process. Finally, our proposed method was implemented into VTM-10.0 and experimental results show that our method can save averagely 7.68% and maximum to 13.62% of the encoding time without encoding performance loss.

关键词： Versatile Video Coding deep learning screen content encoding complexity

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Turing complexity of fixed-rate quantization

Turing complexity of fixed-rate quantization

引用

IEEE Information Theory Workshop

作者： Hui, D Ericsson Inc Adv Dev & Res Res Triangle Pk NC 27513 USA

ISBN: (纸本)0780344081

The rate of increase of quantization complexity, as rate of quantization increases, is investigated under a Turing machine framework. It is shown that the problem of asymptotically optimal scalar quantization has polynomial encoding complexity if the distribution function corresponding to the one-third power of the source density is polynomially computable with high probability.

关键词： Quantization Distribution function Turing scalar quantization encoding complexity Automata theory-Turing machines

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A Novel QC-LDPC Code with Flexible Construction and Low Error Floor

A Novel QC-LDPC Code with Flexible Construction and Low Erro...

引用

16th International Conference on Advanced Communication Technology (ICACT)

作者： Wang, Hanxin Chen, Shaoping Zhu, Cuitao Su, Kaiyou South Cent Univ Nationalities Dept Elect & Informat Engn Wuhan Peoples R China Hubei Key Lab Intelligent Wireless Commun Wuhan Peoples R China

ISBN: (纸本)9788996865032

Slide rectangular window structure for QC-LDPC codes (SRW-QC-LDPC) with flexible code lengths and code rates is proposed, which aim to eliminate the cycles of length 4 without computer search. The parity-check matrix would have different extension factors and structures by using the slide rectangular window in the base matrix, the degree distribution is optimized by the optimal diagonal method. Because the dual-diagonal structure with many variable nodes of degree-2 may lead to high error floor, SRW-QC-LDPC codes with quasi tri-diagonal structure are also proposed by changing the location of the third diagonal to partly eliminate variable nodes of degree-2 for lower error floor. Simulation results show that SRW-QC-LDPC codes with quasi tri-diagonal structure can not only flexibly expand the code lengths and code rates but also reduce the encoding complexity and improve the BER performance compared to quasi dual-diagonal structure in IEEE802.16e QC-LDPC codes. The novel QC-LDPC codes are available and suitable for the adaptive transmission systems and hardware implementation.

关键词： QC-LDPC codes Diagonal Structure Degree Distribution encoding complexity Error Floor

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A Low complexity Encoder Construction for Systematic Quasi-Cyclic LDPC Codes

A Low Complexity Encoder Construction for Systematic Quasi-C...

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IEEE AFRICON Conference - Science, Technology and Innovation for Africa

作者： Genga, Yuval Ogundile, Olayinka Oyerinde, Olutayo Versfeld, Jaco Univ Witwatersrand Sch Elect & Informat Engn Private Bag 3 ZA-2050 Johannesburg South Africa Stellenbosch Univ Dept Elect & Elect Engn Private Bag X1 ZA-7602 Matieland South Africa

ISBN: (纸本)9781538627754

For practical applications in forward error correction, the importance of a systematic codeword cannot be overemphasized. Thus, this paper proposes the construction of a systematic quasi-cyclic (QC) LDPC code. This systematic structure is achieved by a row reduction technique different from the conventional Gaussian elimination method. This row reduction technique has the advantage of being easier to implement when compared to Gaussian row reduction techniques. The proposed row reduction technique maintains the quasi cyclic structure and the sparsity of the QC-LDPC parity check matrix while providing a low complexity approach to the construction of the generator matrix. In addition, the proposed construction exhibits a good BER performance for high rate codes.

关键词： encoding complexity LDPC codes quasi-cyclic systematic structure row reduction

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Partitioned bus coding for energy reduction 05

Partitioned bus coding for energy reduction

引用

10th Asia and South Pacific Design Automation Conference

作者： Xie, Lin Qiu, Peiliang Qiu, Qinru Zhejiang Univ Dept Informat Sci & Elect Engn Hangzhou 310027 Peoples R China

ISBN: (纸本)0780387368

For VLSI design in deep submicron technology, the bus energy reduction has become more and more important. This paper studies the bus partition scheme for the Transition Pattern Coding (TPC). The genetic algorithm based approach is used. A closed-form expression is derived to calculate the energy dissipation for the partitioned bus with TPC coding. A general bus model with coupling capacitance is considered during the energy estimation and optimization. The resulted partitioned bus coding reduces the encoding and decoding complexity of the original TPC. The experimental results show that the TPC with careful bus partitioned saves up to 16.9% the energy of the TPC with random bus partition.

关键词： VLSI system buses encoding genetic algorithms low-power electronics partitioned bus coding VLSI design deep sub micron technology bus energy reduction transition pattern coding genetic algorithm energy dissipation bus model coupling capacitance energy estimation energy optimization encoding complexity decoding complexity

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Variable-Length Source Compression using Successive Refinement and Non-Linear Graph-Based Codes

Variable-Length Source Compression using Successive Refineme...

引用

Data Compression Conference (DCC)

作者： Ramirez-Javega, Francisco Lamarca, Meritxell Univ Politecn Cataluna E-08028 Barcelona Spain

ISBN: (纸本)9780769543529

In this paper we propose a variable-length source code that achieves very good performance even for short sequences and has low encoding complexity, although it does not achieve the theoretical limit. Furthermore, the performance can be predicted for infinite codeword length with close form expressions, and has been proven to be good even when a sub optimum decoder with very low complexity is employed at the decoder side.

关键词： variable length source compression encoding complexity decoders Closed-form solutions Codes Refining

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Fast Inter Sub-Partition Prediction Unit Mode Decision for HEVC

Fast Inter Sub-Partition Prediction Unit Mode Decision for H...

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IEEE International Conference on Consumer Electronics (ICCE)

作者： Yang, Seungha Shim, Hiuk Jae Won, Kwanghyun Jeon, Byeungwoo Sungkyunkwan Univ Suwon Gyeonggi Do South Korea

ISBN: (纸本)9781479912919

In this paper, we propose a fast inter mode decision method for High Efficiency Video Coding (HEVC) in order to reduce its encoding complexity by simplifying the inter prediction unit (PU) mode decision process. Experimental results show that encoding time is reduced by 46.5% at the consequence of only 1.1% coding efficiency loss when the proposed method is jointly used with the early CU termination (ECU) method.

关键词： video coding HEVC coding efficiency loss early CU termination method encoding complexity encoding time fast inter mode decision method fast inter subpartition prediction unit mode decision high efficiency video coding inter prediction unit mode decision process complexity theory Conferences Electrostatic discharges encoding Partitioning algorithms Vectors Video coding

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Quality-Controlled Motion-Compensated Interpolation

Quality-Controlled Motion-Compensated Interpolation

引用

44th Asilomar Conference on Signals, Systems and Computers

作者： Makar, Mina Pang, Derek Lin, Yao-Chung Girod, Bernd Stanford Univ Dept Elect Engn Informat Syst Lab Stanford CA 94305 USA

ISBN: (纸本)9781424497218

Low-complexity video encoding is important for mobile and power-sensitive applications. One way to reduce encoding complexity is to drop frames at the encoder and perform motion-compensated frame interpolation at the decoder. We propose a method to estimate the quality of the interpolated frames at the decoder by transmitting a small amount of error control information in lieu of an omitted frame. Typically, this information is obtained from a projection of the frame on a suitable low-dimensional basis. The projection coefficients can be compressed by conventional techniques or, more efficiently, by Slepian-Wolf coding. Based on the quality estimate, the decoder can recognize and suppress occasional frames for which motion-compensated interpolation does not yield satisfactory picture quality. Experimental results demonstrate that our approach eliminates most interpolation artifacts and achieves much better visual quality at a negligible increase in bit-rate.

关键词： decoders FRAMES Frame Interpolation encoding complexity frame interpolation Quality Control Bit rate Traditional technology ENCODER PROJECTION Mobile

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Decision Tree Based Early Termination Algorithm for Affine Prediction in AVS3 25

Decision Tree Based Early Termination Algorithm for Affine P...

引用

25th IEEE International Workshop on Multimedia Signal Processing (MMSP)

作者： Wu, Jiacheng Sun, Songlin Zhang, Jiaqi Han, Xu Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing Peoples R China Peking Univ Natl Engn Res Ctr Visual Technol Sch Comp Sci Beijing Peoples R China Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn Shanghai Peoples R China

ISBN: (纸本)9798350338935

The third generation of Audio Video Standard(AVS3) has adopted affine prediction(including affine merge mode and affine inter mode), which can characterize non-translational motions such as rotation, zooming, and shearing. Though affine prediction leads to BD-Rate saving, it also results in substantial computational complexity. In this paper, we propose a fast algorithm to address this problem. Some useful features are introduced and used to train five decision tree classifiers to skip unnecessary calculations in affine prediction. Experimental results show that compared to HPM 14.0, the proposed algorithm reduces 19% affine merge time, 18% affine inter time, and 6% encoding time, with negligible coding performance loss under random access(RA) configurations.

关键词： affine prediction machine learning encoding complexity inter prediction AVS3 video coding

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