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检索条件"主题词=Inter coding"

共 33 条记录，以下是21-30 订阅

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Reference Frame Generation Algorithm using Dynamical Learning PredNet for VVC

Reference Frame Generation Algorithm using Dynamical Learnin...

引用

IEEE international Conference on Consumer Electronics (ICCE)

作者： Katayama, Takafumi Song, Tian Shimamoto, Takashi Jiang, Xiantao Tokushima Univ Grad Sch Technol Ind & Social Sci Tokushima 7708506 Japan Shanghai Maritime Univ Dept Informat Engn Shanghai 201306 Peoples R China

ISBN: (纸本)9781728197661

The reference frame plays an important role in the coding efficiency of inter-frame prediction in versatile video coding (VVC). In particular, the prediction of non-linear motion is a challenge for the motion compensation. In this paper, we proposed a new reference frame generation algorithm using dynamical learning PredNet for the inter prediction. The proposed PredNet which include training and inference is implemented to frame buffer in the VVC encoder. The proposed VVC encoder is achieved by the pipeline processing. The simulation results show that the proposed algorithm can achieve an improvement of 0.58% BD-rate comparing to the original VVC algorithm.

关键词： Versatile Video coding (VVC) inter coding Recurrent neural network

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Recent Development of AVS Video coding Standard: AVS3

Recent Development of AVS Video Coding Standard: AVS3

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Picture coding Symposium (PCS)

作者： Zhang, Jiaqi Jia, Chuanmin Lei, Meng Wang, Shanshe Ma, Siwei Gao, Wen Chinese Acad Sci Inst Comp Technol Beijing Peoples R China Univ Chinese Acad Sci Beijing Peoples R China Peking Univ Inst Digital Media Beijing Peoples R China

ISBN: (纸本)9781728147048

The paper presents a systematic and comprehensive overview of the third generation of Audio Video Standard (AVS) in China. The AVS standards continuously attract extensive attention both domestically and worldwide along with the industrialization of AVS2 standard and the broadcasting of China Central Television (CCTV) 4K channel. Currently, AVS3 has adopted many novel coding techniques including block partitioning structure, intra/inter and transform coding tools. The compression performance has been significantly improved that the latest version of AVS3 obtains about 24.3% and 26.88% bit-rate reduction against AVS2 and HEVC respectively under 4K resolution sequences.

关键词： AVS3 video coding standard intra coding inter coding

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An Adaptive Search Range Method for HEVC with the K-Nearest Neighbor Algorithm

An Adaptive Search Range Method for HEVC with the K-Nearest ...

引用

IEEE Visual Communications and Image Processing (VCIP) Conference

作者： Li, Yuchen Liu, Yitong Yang, Hongwen Yang, Dacheng Beijing Univ Posts & Telecommun Wireless Theories & Technol Lab Beijing 100876 Peoples R China

ISBN: (纸本)9781467373142

The latest video coding standard, High Efficiency Video coding (HEVC), has a large amount of complexity in its inter coding. To reduce the complexity of the inter coding for HEVC, an adaptive searching range algorithm is proposed in this paper. The proposed method separates inter coding into a learning stage and predicting stage. In the learning stage, the relationship between the prediction units (PC) difference, the length of the motion vector prediction (MVP), and the best searching range is learned. In the predicting stage, the k-nearest neighbor algorithm is adopted to find the best searching range based on the learned data. Experiments showed that 91% of the complexity of the motion estimation is reduced compared with the full search method.

关键词： HEVC Adaptive Search Range (ASR) KNN algorithm inter coding

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Adaptive Variance-Threshold-Based Skip Modes for Learned Video Compression Using a Motion Complexity Criterion

Adaptive Variance-Threshold-Based Skip Modes for Learned Vid...

引用

Picture coding Symposium (PCS)

作者： Brand, Fabian Seiler, Juergen Sauer, Johannes Alshina, Elena Kaup, Andre Friedrich Alexander Univ Erlangen Nurnberg Multimedia Commun & Signal Proc Erlangen Germany Huawei Technol Dusseldorf GmbH Dusseldorf Germany

ISBN: (纸本)9798350358483;9798350358490

Skip modes are a powerful tool to reduce the rate in video compression. The main idea is that the residual areas where the prediction performs well are not transmitted since the prediction quality is good enough that the prediction signal itself can be used as the reconstruction signal. This is commonly used, e.g., in the compression standard VVC, where a skip flag can be transmitted for inter blocks under certain conditions. The skipped residual block is then not transmitted and the content is instead inferred to be zero at the decoder. Current learning-based methods use different kinds of skip modes. One possibility here arises from the fact that the coders estimate and transmit the variance for each transmitted symbol. It has been proposed to use this estimated variance to derive a skip mode. When the variance falls below a threshold, the symbol is not transmitted. In this paper we propose an extension to this method. By classifying each position in the latent space according to the local motion complexity, we can transmit adaptive thresholds for each class. That way, we can employ motion information to refine the granularity of the skip mode. When we implement this method in FVC, we are able to save up 2.11% rate on a GOP 20 sequence. We also discuss the behavior of increasingly adaptive skip modes in scenarios with larger GOP size, where error-propagation becomes a larger issue.

关键词： video compression inter coding skip mode motion compensation learning-based compression

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INTRA TO inter: TOWARDS INTRA PREDICTION FOR LEARNING-BASED VIDEO CODERS USING OPTICAL FLOW

INTRA TO INTER: TOWARDS INTRA PREDICTION FOR LEARNING-BASED ...

引用

IEEE international Conference on Image Processing (ICIP)

作者： Brand, Fabian Seiler, Jurgen Kaup, Andre Friedrich Alexander Univ Erlangen Nurnberg Multimedia Commun & Signal Proc Erlangen Germany

ISBN: (纸本)9781665441155

Traditional video coders often rely on a block structure for transmission. Here each block is coded separately and sequentially and for each block the encoder can decide whether to use intra or inter prediction. This way, inter and intra prediction can be mixed within a single frame. This has advantages when new areas are uncovered, which were not present in the reference frame, and can hence not be predicted well. These areas are typically predicted using intra prediction. Currently much research goes into end-to-end-trained video coders which do not operate on a block level and typically use dense motion fields for inter prediction. There it is more difficult to incorporate intra prediction for uncovered regions. In this paper we propose a novel concept which enables us to reinterpret classical angular intra prediction in a way that we can transmit it as part of the dense motion field. We can save an average of 18% rate for the transmission of the motion vectors for the same quality of the prediction image.

关键词： inter coding Optical Flow Non-Block-Based Video coding Intra Prediction

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On Benefits and Challenges of Conditional interframe Video coding in Light of Information Theory

On Benefits and Challenges of Conditional Interframe Video C...

引用

Picture coding Symposium (PCS)

作者： Brand, Fabian Seiler, Juergen Kaup, Andre Friedrich Alexander Univ Erlangen Nurnberg Multimedia Commun & Signal Proc Erlangen Germany

ISBN: (纸本)9781665492577

The rise of variational autoencoders for image and video compression has opened the door to many elaborate coding techniques. One example here is the possibility of conditional interframe coding. Here, instead of transmitting the residual between the original frame and the predicted frame (often obtained by motion compensation), the current frame is transmitted under the condition of knowing the prediction signal. In practice, conditional coding can be straightforwardly implemented using a conditional autoencoder, which has also shown good results in recent works. In this paper, we provide an information theoretical analysis of conditional coding for inter frames and show in which cases gains compared to traditional residual coding can be expected. We also show the effect of information bottlenecks which can occur in practical video coders in the prediction signal path due to the network structure, as a consequence of the data-processing theorem or due to quantization. We demonstrate that conditional coding has theoretical benefits over residual coding but that there are cases in which the benefits are quickly canceled by small information bottlenecks of the prediction signal.

关键词： video compression inter coding conditional coding information theory conditional autoencoder

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Study on Segmentation-based HEVC Compression Performance 9

Study on Segmentation-based HEVC Compression Performance

引用

9th international Symposium on Computational Intelligence and Design (ISCID)

作者： He, Xiaohai Li, Xiangqun Qing, Linbo Su, Shan Sichuan Univ Coll Elect & Informat Engn Chengdu Peoples R China

ISBN: (纸本)9781509035588

Since the improvement of high efficient video coding (HEVC) compression ratio is yet not studied completely, a new segmentation-based image compression coding frame is realized in this paper. The compression performance of this coding frame is further improved by taking the coding standard HEVC as a basic part of image compression, using the characteristics of HEVC intra coding and inter coding as well as segmentation. Combined with the traditional coding frame HEVC, the frame is to fully use the excellent compression performance of existing standard frames, thus, fundamentally, ensuring the compression performance of the frame is proposed. Experimental results show that, at low bitrate section, the compression performance of the frame proposed is much better than that of HEVC.

关键词： HEVC intra coding inter coding bitrate

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Kvazaar 2.0: Fast and Efficient Open-Source HEVC inter Encoder 20

Kvazaar 2.0: Fast and Efficient Open-Source HEVC Inter Encod...

引用

11th ACM Multimedia Systems Online Conference (MMSys)

作者： Lemmetti, Ari Viitanen, Marko Mercat, Alexandre Vanne, Jarno Tampere Univ Ultra Video Grp Tampere Finland

ISBN: (纸本)9781450368452

High Efficiency Video coding (HEVC) is the key to economic video transmission and storage in the current multimedia applications but tackling its inherent computational complexity requires powerful video codec implementations. This paper presents Kvazaar 2.0 HEVC encoder that is the new release of our academic open-source software (***/ultravideo/kvazaar) . Kvazaar 2.0 introduces novel inter coding functionality that is built on advanced rate-distortion optimization (RDO) scheme and speeded up with several early termination mechanisms, SIMD-optimized coding tools, and parallelization strategies. Our experimental results show that the proposed coding scheme makes Kvazaar 125 times as fast as the HEVC reference software HM on the Intel Xeon E5-2699 v4 22-core processor at the additional coding cost of only 2.4% on average. In constant quantization parameter (QP) coding, Kvazaar is also 3 times as fast as the respective preset of the well-known practical x265 HEVC encoder and is still able to attain 10.7% lower average bit rate than x265 for the same objective visual quality. These results indicate that Kvazaar has become one of the leading open-source HEVC encoders in practical high-efficiency video coding.

关键词： High Efficiency Video coding (HEVC) Kvazaar HEVC encoder open-source rate-distortion optimization (RDO) inter coding

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Fast HEVC inter Prediction Algorithm Based on Spatio-Temporal Block Information 12

Fast HEVC Inter Prediction Algorithm Based on Spatio-Tempora...

引用

12th IEEE international Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Wang, Xuanjing Xue, Yonglin Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China Tsinghua Natl Lab Informat Sci & Technol Beijing Peoples R China Tsinghua Univ Res Inst Informat & Technol Beijing Peoples R China

ISBN: (纸本)9781509049370

High Efficiency Video coding (HEVC) is the latest video coding standard established, which introduces a number of new coding tools such as hierarchical structures of coding unit (CU), prediction unit (PU) and transform unit (TU) to improve the compression capacity of encoding. Compared with H. 264/AVC, the compression performance increased by nearly 50% at the cost of the algorithm complexity increasing significantly. One of the most time-consuming part is the inter coding process taking over 60% of the encoding time. In this paper, in order to reduce the computational pressure on the encoder side, we design an algorithm based on spatio-temporal characteristics of the encoding pictures. First, we adopt a CU depth pruning strategy based on the texture feature and motion information of the blocks. Then, based on the motion vectors (MVs) of adjacent coded blocks, we introduce a fast reference picture selection strategy. Experimental results show that the proposed algorithm achieves 50% time saving on average with negligible loss of coding efficiency compared with HEVC reference software HM16.9.

关键词： HEVC inter coding Motion vector Video coding and processing Performance evaluation

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Data Hiding in Encoded Video Sequences based on H.264

Data Hiding in Encoded Video Sequences based on H.264

引用

3rd IEEE international Conference on Computer Science and Information Technology (ICCSIT)

作者： Li, Xiaoni Chen, Hexin Wang, Dazhong Liu, Tian Hau, Gang Jilin Univ Sch Commun Engn Changchun Peoples R China Univ Sheffield Dept Elect & Elect Engn Sheffield S Yorkshire England

ISBN: (纸本)9781424455379

Different data hiding methods would be required in different operating environments. To improve the quality of videos embedded by data, this paper will apply the differences of matching blocks in the H.264 encoder during the inter prediction stage and enforce the size of the matching blocks to implement data hiding. Bit rate increases after being embedded by data, to resolve the problem, this paper will mainly make use of the method of modifying the trailing coefficients sign-bit of fixed-length coding to control the bit rate in Context Adaptive Variable Length coding (CA VLC). To equipoise the quality and bit rate of videos, this paper proposes an algorithm that embeds data separately in both of these two coding blocks.

关键词： H.264 inter coding CAVLC

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