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检索条件"主题词=Intra coding"

共 237 条记录，以下是71-80 订阅

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intra PREDICTION METHOD BASED ON THE LINEAR RELATIONSHIP BETWEEN THE CHANNELS FOR YUV 4:2:0 intra coding

INTRA PREDICTION METHOD BASED ON THE LINEAR RELATIONSHIP BET...

引用

16th IEEE International Conference on Image Processing

作者： Lee, Sang Heon Cho, Nam Ik Seoul Natl Univ Sch Elect Engn Seoul 151744 South Korea

ISBN: (纸本)9781424456536

In general, the transformation from RGB to YUV color space reduces the correlation between the channels. But some sources in the YUV space still have strong inter-channel correlation, which can be modeled as a linear function. Based on this linear model, we propose a new intra chrominance prediction method for color image compression in YUV 4:2:0 color space. A block of chrominance pixels to be encoded is predicted from the reconstructed luminance signal using the proposed prediction scheme and the residual is encoded based on the H.264/AVC. Also, an implicit prediction method that can obviate the transmission of side information is proposed. The experimental results show that there are about 0.35 similar to 1.0dB gains for the luminance (Y) channel, and 0.5 similar to 3.0dB gains for the chrominance (Cb or Cr) channels at the medium to high bit-rates. The proposed method also shows some gains at the low bit-rates.

关键词： intra coding Inter-Channel Correlation

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A Convolutional Neural Network-Based Approach to Rate Control in HEVC intra coding

A Convolutional Neural Network-Based Approach to Rate Contro...

引用

IEEE Visual Communications and Image Processing (VCIP)

作者： Li, Ye Li, Bin Liu, Dong Chen, Zhibo Univ Sci & Techonol China CAS Key Lab Technol Geospatial Informat Proc & Ap Hefei 230027 Anhui Peoples R China Microsoft Res Asia Beijing Peoples R China

ISBN: (纸本)9781538604625

Rate control is an essential element for the practical use of video coding standards. A rate control scheme typically builds a model that characterizes the relationship between rate (R) and a coding parameter, e.g. quantization parameter or Lagrange multiplier (lambda). In such a scheme, the rate control performance depends highly on the modeling accuracy. For inter frames, the model parameters can be precisely updated to fit the video content, based on the information of previously coded frames. However, for intra frames, especially the first frame of a video sequence, there is no prior information to rely on. Therefore, intra frame rate control has remained a challenge. In this paper, we adopt the R-lambda model to characterize each coding tree unit (CTU) in an intra frame, and we propose a convolutional neural network (CNN) based approach to effectively predict the model parameters for every CTU. Then we develop a new CTU level bit allocation and bitrate control algorithm based on the R-lambda model for HEVC intra coding. The experimental results show that our proposed CNN-based approach outperforms the currently used rate control algorithm in HEVC reference software, leading to on average 0.46 percent decrease of rate control error and 0.7 percent BD-rate reduction.

关键词： H.265/HEVC intra coding Rate control Convolutional neural network (CNN) R-lambda model

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Weighted Rate-Distortion Optimization for Screen Content intra coding

Weighted Rate-Distortion Optimization for Screen Content Int...

引用

IEEE Visual Communications and Image Processing (VCIP) Conference

作者： Xiao, Wei Li, Bin Xu, Jizheng Shi, Guangming Wu, Feng Xidian Univ Sch Elect Engn 2 South Taibai Rd Xian Peoples R China Microsoft Res Asia Beijing Peoples R China Univ Sci & Technol China Sch Informat Sci & Technol Hefei Peoples R China

ISBN: (纸本)9781467373142

Screen content videos often have mixed content consisting of various types such as natural content, text and graphics in the same picture. To achieve high coding efficiency for this content, new coding tools are developed in the High Efficiency Video coding (HEVC) standard Screen Content coding (SCC) extension. Among them, intra block copy (intraBC) allows a nonlocal intra prediction from the coded region of the same picture. However, the rate-distortion optimization (RDO) scheme of the screen content coding still follows that of the HEVC reference software and each block is optimized locally. The screen content characteristics are not fully utilized in the current RDO scheme. This paper presents a weighted RDO scheme for the intra coding of screen content videos, which measures the importance of each block within the picture first and then larger distortion weights are applied to the blocks with larger importance in the RDO. In this way, a better rate-distortion trade-off can be achieved for the picture instead of the blocks themselves. The experimental results show that up to 5.5% coding efficiency gain can be achieved compared with the reference software.

关键词： HEVC Screen content coding intra coding intra block copy Rate-distortion optimization

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A NEW BLOCK-BASED coding METHOD FOR HEVC intra coding

A NEW BLOCK-BASED CODING METHOD FOR HEVC INTRA CODING

引用

IEEE International Conference on Multimedia & Expo Workshops (ICMEW)

作者： Chen, Chen Zeng, Bing Zhu, Shuyuan Miao, Zexiang Zeng, Liaoyuan Hong Kong Univ Sci & Techonol Dept Elect & Comp Engn Hong Kong Hong Kong Peoples R China Univ Elect Sci & Technol China Inst Image Proc Chengdu Sichuan Peoples R China

ISBN: (纸本)9781479970797

This paper presents a new block-based coding method for HEVC intra coding. Pixels in each prediction block are divided into two parts: half pixels are coded by a smart padding technique together with a constrained quantization algorithm;whereas the other half are reconstructed by simple linear interpolations along the prediction direction utilizing the neighboring reference pixels and the first half coded pixels. In the implementation, we employ a competition mechanism between this new method and the original HEVC intra coding in order to choose the best mode for each prediction block. Simulation results show that about 2% BD-rate reduction has been achieved with respect to HEVC's intra coding.

关键词： HEVC intra coding smart padding constrained quantization interpolation R-D performance

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Luminance-Guided Chrominance Image Enhancement for HEVC intra coding

Luminance-Guided Chrominance Image Enhancement for HEVC Intr...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Liu, Hewei Yang, Renwei Zhu, Shuyuan Wen, Xing Zeng, Bing Univ Elect Sci & Technol China Sch Informat & Commun Engn Chengdu Peoples R China Kuaishou Beijing Peoples R China

ISBN: (纸本)9781665484855

In this paper, we propose a luminance-guided chrominance image enhancement convolutional neural network for HEVC intra coding. Specifically, we firstly develop a gated recursive asymmetric-convolution block to restore each degraded chrominance image, which generates an intermediate output. Then, guided by the luminance image, the quality of this intermediate output is further improved, which finally produces the high-quality chrominance image. When our proposed method is adopted in the compression of color images with HEVC intra coding, it achieves 28.96% and 16.74% BDrate gains over HEVC for the U and V images, respectively, which accordingly demonstrate its superiority. The code is available online: https://***/Nickyang4900/LuminanceGuided-Chrominance-Enhancement-for-HEVC-intra-coding.

关键词： Luminance chrominance enhancement HEVC intra coding

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HEVC intra coding Acceleration Based on Tree Inter-level Mode Correlation

HEVC Intra Coding Acceleration Based on Tree Inter-level Mod...

引用

Conference on Signal Processing - Algorithms, Architectures, Arrangements, and Applications (SPA)

作者： da Silva, Thaisa Leal Agostini, Luciano V. da Silva Cruz, Luis A. UC IT Coimbra Portugal UC Dept Elect & Comp Engn Coimbra Portugal Fed Univ Pelotas UFPel Ctr Technol Dev CDTec Grp Architectures & Integrated Circuits GACI Pelotas Brazil

ISBN: (纸本)9788362065172

The introduction of a larger number of prediction directions in HEVC intra coding process intended to achieve higher encoding efficiency when compared to its predecessors such as H.264/AVC. However, this increase in the number of prediction directions resulted in an enhanced rate-distortion (RD) performance at the cost of very high computational complexity. This paper proposes an algorithm to accelerate the intra coding mode decision, reducing the computational complexity of this process. The acceleration procedure takes into account the edge orientation of the current PU texture and the correlation between the intra modes chosen across the levels of the HEVC tree coding structure. Experimental results show that the proposed algorithm provides a decrease of up to 37.85% in the HEVC intra prediction processing time, with a small degradation in encoding efficiency (BD-PSNR loss of 0.06 dB on average).

关键词： intra coding High Efficiency Video coding (HEVC) edge orientation inter-levels correlation computational complexity

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ONE DIMENSIONAL PREDICTION AND TRANSFORM FOR intra coding

ONE DIMENSIONAL PREDICTION AND TRANSFORM FOR INTRA CODING

引用

18th IEEE International Conference on Image Processing (ICIP)

作者： Lai, Changcai Jiang, Jie Zhang, Philipp Huawei HiSilicon Technol Res Dept Shenzhen Peoples R China Xidian Univ Sch Electro Mech Engn Xian Peoples R China

ISBN: (纸本)9781457713033

A new intra coding method based on one dimensional line prediction with one dimensional transform is presented. The H. 264/AVC design includes a multidirectional spatial prediction method to reduce spatial redundancy by using neighboring samples as a prediction for all the samples in a block of data to be encoded. In the proposed intra coding method, the spatial prediction is performed based on line by line in horizontal or vertical direction instead of in the block-based manner used in the current H. 264/AVC standard, with one dimensional DCT transform for the residuals. Experimental results on CIF (352x288) sequences show that the new line based intra coding framework reduces the bit rate by approximately 4.3% and 7.2% at the same PSNR comparing with H. 264/AVC high profile and baseline profile, respectively.

关键词： intra coding prediction line

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PERCEPTUAL FAST CU SIZE DECISION ALGORITHM FOR AVS2 intra coding 5

PERCEPTUAL FAST CU SIZE DECISION ALGORITHM FOR AVS2 INTRA CO...

引用

5th IEEE International Conference on Multimedia Big Data (BigMM)

作者： Xie, Hao Xiang, Guoqing Yu, Dunshan Yu, Hong Li, Yuan Yan, Wei Peking Univ Sch Software & Microelect Beijing 100871 Peoples R China Peking Univ Sch Elect Engn & Comp Sci Beijing 100871 Peoples R China

ISBN: (纸本)9781728155272

AVS2 is a kind of video coding standard proposed by China, it adopts a flexible partition structure to improve coding perfounance, while the recursive quad-tree split coding unit (CU) structure brings a significant increase in coding complexity. In order to reduce the computational complexity of intra coding, quite a number of fast CU size decision algorithms have been studied. However, traditional algorithms have focused on reducing encoding time while remaining the objective perfounance without perceptual consideration. In order to obtain more time savings by taken of the subjective performance, therefore, in this paper, a perceptual CU size decision algorithm based on the spatial temporal neighboring infounation and its internal perceptual texture infounation is proposed. Experimental results show that our approach can achieve 28.06% time complexity reduction on average under all intra testing configuration on RD17.0, while the BD-Rate loss is negligible with SSIM metric.

关键词： AVS2 perceptual coding CU size decision intra coding

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INTER-BLOCK DEPENDENCIES CONSIDERATION FOR intra coding IN H.264/AVC AND HEVC STANDARDS

INTER-BLOCK DEPENDENCIES CONSIDERATION FOR INTRA CODING IN H...

引用

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

作者： Bichon, M. Le Tanou, J. Ropert, M. Hamidouche, W. Morin, L. Zhang, L. Ericsson TV & Media F-35136 St Jacques De La Lande France INSA Rennes IETR UMR6164 F-35708 Rennes France

ISBN: (纸本)9781509041176

Recent MPEG video compression standards are still block-based: blocks of pixels are sequentially coded using spatial or temporal prediction schemes. For each block, a vector of coding parameters has to be selected. In order to limit the complexity of this decision, independence between blocks is assumed, and coding parameters are locally optimized to maximize the coding efficiency. Few studies have investigated the benefits of inter-block dependencies consideration using Joint Rate-Distortion Optimization (JRDO), especially in intra coding. To the best of our knowledge, maximum achievable gains of such approaches have never been exhibited. In this paper, we propose two JRDO models performing joint optimization of multiple blocks applied to intra prediction mode decision. The proposed models have been evaluated in both H. 264/AVC and HEVC standards. These two models enables a bitrate saving with respect to the classical RDO model up to -3.10% and -2.31% in H. 264/AVC and HEVC, respectively.

关键词： Inter-Block Dependencies Joint Rate-Distortion Optimization intra coding H.264/AVC HEVC

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FAST CU SIZE DECISION AND PU MODE DECISION ALGORITHM IN HEVC intra coding

FAST CU SIZE DECISION AND PU MODE DECISION ALGORITHM IN HEVC...

引用

IEEE International Conference on Image Processing (ICIP)

作者： Shang, Xiwu Wang, Guozhong Fan, Tao Li, Yan Shanghai Univ Sch Commun & Informat Engn Shanghai Peoples R China

ISBN: (纸本)9781479983391

High Efficiency Video coding (HEVC) is a new video compression standard for high resolution video content, which only needs 50% bit rate of the H.264/AVC at the same perceptual quality. However, high computational complexity increases dramatically for adopting quad-tree structured coding Unit (CU). In this paper, a fast CU size decision and Prediction Unit (PU) mode decision algorithm is presented for HEVC intra coding. It exploits the depth information of neighboring CUs to make an early CU split decision or CU pruning decision. Moreover, there are correlations between the higher layer prediction mode and current layer mode in PUs. By using these correlations, we can terminate some prediction modes which are rarely selected as the optimal mode. Experimental results illustrate that the proposed method can save 37.91% computational complexity on average as compared with the current HM with only 0.66% increase in BDBR and 0.03 dB loss in BDPSNR.

关键词： HEVC size decision mode decision intra coding

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