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检索条件"主题词=coding efficiency"

共 163 条记录，以下是131-140 订阅

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A NOVEL THREE-DIMENSIONAL TRANSFORM AND ITS SUPPORTING TOOLS FOR IMPROVING INTER coding PERFORMANCE IN H.264/AVC

A NOVEL THREE-DIMENSIONAL TRANSFORM AND ITS SUPPORTING TOOLS...

引用

IEEE International Conference on Image Processing

作者： Jo, Jaekyu Cho, Hye-Jeong Lee, Jinho Jung, Seyoon Oh, Seoung-Jun Kwangwoon Univ BnC Convergence Platform Ctr Seoul South Korea Elect & Telecommun Res Inst Zurich Switzerland

ISBN: (纸本)9781424479948

This paper proposes a three-dimensional transform (3DT) and its supporting tools: 3DT_Env. 3DT_Env improves H. 264/AVC inter coding performance from four aspects: 1) H. 264/AVC coding is enhanced with the 3DT, 2) As the 3DT is proposed, a quantizer should be redesigned, 3) A new scanning method which considers the directions of INTER16x8 and INTER8x16 modes improves the efficiency of H. 264/AVC, and 4) a threshold for cost calculation is optimized for the 3DT. Compared to H. 264/AVC, the improvements can bring on average 4.07% coding gain for CABAC in high profile, with average coding gain of 5.34% for HD sequences.

关键词： H.264/AVC 3DT_Env 3DT quantizer scanning method threshold coding efficiency

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Packet loss concealment in predictive audio coding

Packet loss concealment in predictive audio coding

引用

Workshop on Applications of Signal Processing to Audio and Acoustics

作者： Wabnik, S Schuller, G Hirschfeld, J Kraemer, U Fraunhofer Inst Digital Media Technol D-98693 Ilmenau Germany

ISBN: (纸本)0780391543

In this paper we present and evaluate Several concealment strategies for packet losses in the context of it low delay predictive audio coder. Our goal is to minimize the audible impact of a packet loss. The problem is that the Predictive coder is backward adaptive, hence depending on past values. There is a predictor reset, but to increase coding efficiency. the distance between two resets is several hundred packets. Hence, not only the lost packet itself cannot be reconstructed, but the transmitted data LIP to the next reset does not result in an exact reconstruction of the audio signal. Our approach is to try to use its much information as possible from the still available data until the next reset. and to reconstruct an audio signal such that distortions are least objectionable. To compare different approaches, we conducted it listening test. The result is that an adaptive reconstruction filter works best in this context.

关键词： audio coding adaptive reconstruction filter audible impact audio signal coding efficiency packet loss concealment packet losses predictive audio coding Packet loss Audio coding audio signals code efficiency audio coder Data Security

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Statistical analysis of SHVC encoded video 2

Statistical analysis of SHVC encoded video

引用

2nd International Conference on Image Processing, Applications and Systems (IPAS)

作者： Wali, Ibtissem Kessentini, Amina Ben Ayed, Mohamed Ali Masmoudi, Nouri Univ Sfax Natl Engn Sch Sfax Elect & Informat Technol Lab LETI Sfax Tunisia

ISBN: (纸本)9781509016457

Scalable extension (SHVC) of the High efficiency Video coding HEVC was developed to ameliorate the coding efficiency for different types of scalability. In this paper, a survey for SHVC extensions is investigated. We describe its scalability types and explain the different additional coding features that further improve the Enhancement Layer (EL) coding efficiency. Furthermore, we evaluate and prove the effectiveness of the SHVC through experimental results for different coding configurations reduction of about. Based on statistical analysis, depth 0 ( 64x64) can reach more than 75% of use in B1 frame. This statistics helped us explore deeply on the prediction mode percentages.

关键词： Video coding HEVC SHVC coding efficiency statistical analysis

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Towards Much Better SVT-AV1 Quality-Cycles Tradeoffs for VOD Applications 44

Towards Much Better SVT-AV1 Quality-Cycles Tradeoffs for VOD...

引用

Conference Applications of Digital Image Processing XLIV

作者： Wu, Ping-Hao Katsavounidis, Ioannis Lei, Ryan Ronca, David Tmar, Hassene Abdelkafi, Omran Cheung, Colton Ben Amara, Foued Kossentini, Faouzi Facebook Menlo Pk CA USA Intel Corp Suite 700450 SW Marine Dr Vancouver BC V5X 0C3 Canada

ISBN: (数字)9781510645233

ISBN: (纸本)9781510645233;9781510645226

Software video encoders that have been developed based on the AVC, HEVC, VP9, and AV1 video coding standards have provided improved compression efficiency but at the cost of large increases in encoding complexity. As a result, there is currently no software video encoder that provides competitive quality-cycles tradeoffs extending from the AV1 high-quality range to the AVC low-complexity range. This paper describes methods to further improve the SVT-AV1 overall quality-cycles tradeoffs for high-latency VOD applications. The paper first presents the latest SVT-AV1 encoder evaluation results generated using the conventional convex-hull-based evaluation approach. To better account for all the content being considered in the evaluation, the combined convex hull approach is then introduced and corresponding results outlined. A more practical version of the latter approach, referred to as the restricted discrete approach, is then presented. In this approach, only few discrete quality levels that are of relevance to typical adaptive streaming applications are considered. This restriction makes the evaluation data more relevant to real adaptive streaming applications and reduces the storage requirements for the encodings generated at the identified optimal encoder settings. A fast version of the latter approach is then presented, where the generation of the optimal encoder parameters is performed using a fast encoder, and the final encodings needed in the evaluation are generated using the desired encoder based on the identified optimal encoder parameters. These optimizations result in a complexity reduction by up to a factor of 10 for at most 1.5% loss in BD-rate.

关键词： AV1 SVT-AV1 Video compression coding efficiency Adaptive streaming Convex hull Dynamic optimizer Encoder complexity

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Generalized theory of hunting-free framing codes for digital transmission and multiplexing

Generalized theory of hunting-free framing codes for digital...

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9th World Multi-Conference on Systemics, Cybernetics and Informatics

作者： Takasaki, Yoshitaka Toyo Univ Dept Elect & Elect Engn Kawagoe Saitama 3508585 Japan

ISBN: (纸本)9789806560543

Generalized theory of hunting-free framing codes is invesigated as extentions of previous results based on multipled block codes (MBCs). First, the principles of MBC based codes are overviewed to show their capacities for realizing hunting-free reframing. Then it is shown that modification of above codes can be used for obtaining more generalized version of code formats. Finally, optimization and comparison of efficiencies of generalized hunting-free framing codes are investigated to show their improved efficiencies.

关键词： digital transmission framing hunting-free fi-aming generalized codes coding efficiency

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AN EFFICIENT VIDEO coding TECHNIQUE USING A NOVEL NON-PARAMETRIC BACKGROUND MODEL

AN EFFICIENT VIDEO CODING TECHNIQUE USING A NOVEL NON-PARAME...

引用

IEEE International Conference on Multimedia and Expo Workshops (ICMEW)

作者： Chakraborty, Subrata Paul, Manoranjan Murshed, Manzur Ali, Mortuza Charles Sturt Univ Sch Comp & Math Bathurst NSW 2795 Australia Federat Univ Sch Informat Technol Gippsland Vic 3842 Australia

ISBN: (纸本)9781479947171

Video coding technique with a background frame, extracted from mixture of Gaussian (MoG) based background modeling, provides better rate distortion performance by exploiting coding efficiency in uncovered background areas compared to the latest video coding standard. However, it suffers from high computation time, low coding efficiency for dynamic videos, and prior knowledge requirement of video content. In this paper, we present a novel adaptive weighted non-parametric (WNP) background modeling technique and successfully embed it into HEVC video coding standard. Being non-parametric (NP), the proposed technique naturally exhibits superior performance in dynamic background scenarios compared to MoG-based technique without a priori knowledge of video data distribution. In addition, the WNP technique significantly reduces noise-related drawbacks of existing NP techniques to provide better quality video coding with much lower computation time as demonstrated through extensive comparative studies against NP, MoG and HEVC techniques.

关键词： Video coding Background model Non-parametric model coding efficiency coding performance

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Implementation and Performance Assessment of Gradient Edge Detection Predictor for Reversible Compression of Biomedical Images 2nd

Implementation and Performance Assessment of Gradient Edge D...

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2nd International Conference on Advanced Informatics for Computing Research (ICAICR)

作者： Urvashi Puthooran, Emjee Sood, Meenakshi Jaypee Univ Informat Technol Dept Elect & Commun Engn Waknaghat HP India

ISBN: (纸本)9789811331404;9789811331398

Technological advancement of medical imaging techniques are progressing constantly, dealing with images of increasing resolutions. In hospitals, medical imaging techniques like X-rays, magnetic resonance imaging and computed tomography etc. are of high resolution consuming large storage space. Such high resolution of medical images transmitted over the network utilizes large bandwidth that often results in degradation of image quality. So, compression of images is only a solution for efficient archival and communication of medical images. Predictive based coding technique is explored in this paper for medical image compression as it performs well for lossless compression. This paper presents a comparative investigation on 2D predictor's coding efficiency and complexity on CT images. It was observed that among 2D predictors Gradient Edge Detection (GED) predictor gave better results than Median Edge Detector (MED) and DPCM. GED predictor at proper threshold value achieved approximately same results in terms of various performance metrics as Gradient Adaptive Predictor (GAP) though it is less complex.

关键词： Compression Predictors coding efficiency Complexity

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A Delta-Sigma-Based Transmitter Utilizing FIR-Embedded Digital Power Amplifiers 58

A Delta-Sigma-Based Transmitter Utilizing FIR-Embedded Digit...

引用

IEEE 58th International Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Liu, Heng Jiang, Hanjun Shen, Yiyu Rhee, Woogeun Wang, Zhihua Tsinghua Univ Inst Microelect Beijing 100084 Peoples R China

ISBN: (纸本)9781467365574

This paper presents a new delta-sigma-based transmitter architecture with quantization noise reduction and coding efficiency enhancement for multi-mode wireless sensor network (WSN) applications. The proposed architecture utilizes a finite impulse response (FIR) filter embedded digital power amplifier (DPA) controlled by the output of a 1-bit second order low pass delta-sigma modulator (LPDSM) for both in-phase (I) path and quadrature (Q) path. Thanks to the interleaving operation of the FIR filter, the out-of-band noise is reduced hence coding efficiency is improved according to the behavior model simulation results. Since the switching of power amplifier (PA) is smoothed by FIR, distortion from the PA is also suppressed.

关键词： delta-sigma-based transmitter embedded FIR filter digital power amplifier coding efficiency

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AV1 Benchmarking Test for 3GPP 45

AV1 Benchmarking Test for 3GPP

引用

Applications of Digital Image Processing XLV

作者： Lei, Zhijun Song, Jun Sik Grange, Adrian Han, Jingning Simmons, John Norkin, Andrey Meta Platforms Inc Menlo Pk CA 94025 USA Google LLC Mountain View CA USA Alliance Open Media Wilmington DE USA Netflix Inc Los Gatos CA USA

ISBN: (纸本)9781510654372;9781510654365

AV1 is the first-generation royalty free video coding standard developed by the Alliance for Open Media (AOM). Since it was finalized in 2018, there have been a lot of attempts to compare the compression efficiency of AV1 against previous generations of video coding standards, such as HEVC, VP9, etc. Some study results have been published previously, but the results vary significantly depending on test conditions and encoder configurations used. It is challenging to design a test configuration and align the encoding parameters to perform a benchmarking test between coding standards and their encoder implementations. Recently, 3GPP started an exploration project to evaluate next generation video coding standards, after AVC and HEVC, for consideration in future 3GPP standards and applications. In this project, a comprehensive set of test conditions was defined to compare the submitted coding specifications, including AV1, VVC, and EVC, versus HEVC and AVC. The evaluation was conducted using reference encoders for each specification. The reference encoders of each proposed coding specification were thoroughly tested using the defined test condition set to provide benchmarking data that could be used in their evaluation and possible inclusion for future 5G streaming services. In this paper, we will first discuss the test scenarios and test configurations for the 3GPP benchmarking test. Then, the detailed encoding parameters for the AV1 reference encoder, which comply with this set of test conditions, will be introduced and the benchmarking test result will be presented. Finally, we will introduce some encoding settings that can be applied to the AV1 reference encoder without some HM and VTM inspired restrictions defined in the test 3GPP test conditions and the corresponding compression efficiency improvement that can be achieved in the expected AV1 usage.

关键词： AV1 Video compression coding efficiency AVC HEVC EVC VVC 3GPP

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Automatic speech decomposition and speech coding using MDCT-based hidden Markov chain and wavelet-based hidden Markov tree models

Automatic speech decomposition and speech coding using MDCT-...

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Workshop on Applications of Signal Processing to Audio and Acoustics

作者： Tantibundhit, C Boston, JR Li, CC El-Jaroudi, A Univ Pittsburgh Dept Elect & Comp Engn Pittsburgh PA 15261 USA

ISBN: (纸本)0780391543

Speech is decomposed into three different components. based on the idea of Daudet and Torresani (Signal Processing, vol. 82, no. 11, pp. 1595, 2002), as signal = tonal + transient + residual. The tonal and transient components identified using a small number of coefficients of the modified discrete cosine transform (.MDCT.) and the wavelet transform, respectively. Determinations of the significant MDCT and wavelet coefficients in the algorithm of Daudet and Torresani, referred as the D&T algorithm, ire achieved by thresholds. All MDCT coefficients are assumed to be independent as well as wavelet coefficients. However, the MDCT coefficients probably have statistical dependencies, namely the clustering, and persistence properties, and so do the wavelet coefficients. We propose a modification to the D&T algorithm, that can capture statistical dependencies by utilizing the hidden Markov model. The Viterbi and the Maximum a Posteriori (MAP) algorithms, used to find file optimal state distribution, are applied to determine the significant MDCT and wavelet coefficients automatically. The modified algorithm was used to encode 43 monosyllabic Consonant-Vowel-Consonant (CVC) words and 3 sentences. Results showed that the modified algorithm improves the coding efficiency by 37% compared with the threshold method of D&T algorithm when equal numbers of significant coefficients;are used.

关键词： discrete cosine transforms hidden Markov models maximum likelihood estimation speech coding trees (mathematics) wavelet transforms MAP algorithms Viterbi algorithms automatic speech decomposition clustering properties coding efficiency hidden Markov chai speech coding Hidden Markov models Viterbi algorithm mdct(modified discrete cosine transform) discrete cosine transforms wavelet transforms Wavelet coefficients maximum likelihood estimation code efficiency Markov chain algorithms THRESHOLDING METHOD

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