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Scene change adaptation for scalable video coding

Scene change adaptation for scalable video coding

引用

17th European Signal Processing Conference, EUSIPCO 2009

作者： Anselmo, Tea Alfonso, Daniele Advanced System Technology Labs. STMicroelectronics Via Olivetti 2 20041 Agrate Brianza Italy

This document presents a Scene Change Adaptation method for the Scalable Video Coding extension of H.264/AVC. Our method is based on a scene change detection algorithm that identifies transitions in video sequences by using the motion information provided by the pre-analysis phase of a Fast Motion Estimation algorithm based on spatial-temporal motion correlation. Intra coding picture is imposed at the end of the Group Of Pictures containing the scene change, thus dynamically adapting the sequence structure to the scene content and preventing the propagation of the prediction error due to scene change. The proposed algorithm has been also combined with a Buffer-Based Constant Bit-Rate control algorithm, which ensures HRD buffer compliance and target bit-rate requirements. Simulation results show that the SCD algorithm can improve the global coding efficiency and the local visual quality when a scene change occurs. © EURASIP, 2009.

关键词： Scalable video coding

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Low-complexity motion estimation for the Scalable Video Coding extension of H.264/AVC

Low-complexity motion estimation for the Scalable Video Codi...

引用

Visual Communications and Image Processing 2009

作者： Lima, Livio Alfonso, Daniele Pezzoni, Luca Leonardi, Riccardo Department of Electronics for Automation University of Brescia Brescia Italy Advanced System Technology Labs STMicroelectronics Agrate Brianza Italy

The recently standardized Scalable Video Coding (SVC) extension of H.264/AVC allows bitstream scalability with improved rate-distortion efficiency with respect to the classical Simulcasting approach, at the cost of an increased computational complexity of the encoding process. So one critical issue related to practical deployment of SVC is the complexity reduction, fundamental to use it in consumer applications. In this paper, we present a fully scalable fast motion estimation algorithm that enables an excellent complexity performance. © 2009 SPIE-IS&T.

关键词： Scalable video coding

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A novel frame skipping method in transcoder, with motion information, buffer fullness and scene change consideration

A novel frame skipping method in transcoder, with motion inf...

引用

17th European Signal Processing Conference, EUSIPCO 2009

作者： Bhattacharyya, Sourya Piccinelli, Emiliano Advanced System and Technology STMicroelectronics Pvt. Ltd. Greater Noida U.P. 201308 India Italy

Frame-skipping is basis for reducing output bit rate in real time transcoding over bandwidth-constrained channels, keeping buffer conditions under control. One approach consists in skipping frames whenever encoder buffer is going to overflow: the drawback is that high motion and scene change frames too might be skipped, incurring in visual artifacts and average compression reduction. Another method is to track motion changes occurrences and to skip low motion complex frames, to maximize output quality of encoded high motion frames. Nevertheless, in low bandwidth channels, high motion frames encoding requires more bits than average. So this approach does not always conform to buffer compliancy. In this paper, we propose a combination of these two fundamental approaches. It monitors buffer fullness in frame by frame manner and also concerns about quality encoding of scene change and high motion frames. Experimental results show that it can produce high quality output even in very low target bit rate transcoding. © EURASIP, 2009.

关键词： Encoding (symbols)

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Adding SVC Spatial Scalability to Existing H.264/AVC Video

Adding SVC Spatial Scalability to Existing H.264/AVC Video

引用

International Conference on Computer and Information Science (ACIS)

作者： Ravin Sachdeva Sumit Johar Emiliano Piccinelli Advanced System Technology STMicroelectronics Private Limited Greater Noida Uttar Pradesh India Advanced System Technology STMicroelectronics Agrate-Brianza Italy

This paper describes an innovative algorithm for adding SVC spatial scalability to all existing non-scalable H.264/AVC video streams. The algorithmic system builds on a full-decode-full-encode method of conversion and employs reuse of available data by an efficient downscaling of video information for different layers, thus reducing the complexity of the algorithm by manifold whilst maintaining a high coding efficiency. The complexity is further reduced by bypassing of various time consuming processes of the encoding process by the use of sharing and reuse of video information coming from original bitstream. Extensive analysis has been done to evaluate the gains in the coding efficiency and complexity of the algorithm using the full-decode-full-encode approach as a benchmark. The ultimate reduction in complexity is at least 60% from full-decode-full-encode while maintaining the output video quality. The modular nature of the algorithm is designed to be easily adaptable to other scalable video standards as well.

关键词： Static VAr compensators Scalability Automatic voltage control Streaming media High definition video Bandwidth Decoding Video sharing HDTV Video coding

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Cache-based motion estimation architecture for real-time HDTV Encoding with H.264/AVC

Cache-based motion estimation architecture for real-time HDT...

引用

IEEE International Symposium on Consumer Electronics (ISCE)

作者： Sumit Johar Ravin Sachdeva Daniele Alfonso Advanced System Technology STMicroelectronics Private Limited India

This paper describes an innovative, pipelined, cache-based architecture for a motion estimation coprocessor based on a predictive/recursive algorithm whose computational complexity is low and independent from the search window. The algorithm and the associated architecture yields itself very well to low-power, low-cost video capture devices with low processing capabilities, such as mobile phones, PDAs, or handhelds. The synergy between architecture and algorithmic features allows a high quality output, low memory to cache bandwidth requirements, and a search window independent implementation for H.264/AVC real time video encoding of up to high definition video (HDTV).

关键词： Motion estimation HDTV Encoding Automatic voltage control Computer architecture High definition video Coprocessors Prediction algorithms Computational complexity Mobile handsets

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Arbitrary spatial downsizing in H.264 to MPEG4 simple profile transcoder

Arbitrary spatial downsizing in H.264 to MPEG4 simple profil...

引用

IEEE International Symposium on Broadband Multimedia systems and Broadcasting (BMSB)

作者： Sourya Bhattacharyya Subarna Tripathi Emiliano Mario Piccinelli Advanced System Technology STMicroelectronics Private Limited Greater Noida Uttar Pradesh India Advanced System Technology STMicroelectronics Private Limited Agrate-Brianza Italy

We present a novel arbitrary spatial downsizing method in H.264 to MPEG4 simple profile transcoder. Using median filtering and scaling of input H.264 4times4 block level motion vectors, downsizing module generates target resolution compatible 4times4 block level motion vector, which is fed at MPEG4 encoder to generate MPEG4 compatible final 16times16 or 8times8 block level motion vector. Downsizing and encoding modules are differentiated for better portability. Our approach, being approximately 6-8 times faster compared to full encode system, achieves almost same compression as compared to full encoding.

关键词： MPEG 4 Standard Encoding Transcoding Decoding Buffer storage Partitioning algorithms Streaming media Code standards Computational complexity Bandwidth

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A NOVEL FRAME SKIPPING METHOD IN TRANSCODER WITH MOTION INFORMATION BUFFER FULLNESS AND SCENE CHANGE CONSIDERATION

A NOVEL FRAME SKIPPING METHOD IN TRANSCODER WITH MOTION INFO...

引用

European signal processing conference

作者： Sourya Bhattacharyya Emiliano Piccinelli Advanced System & Technology STMicroelectronics Pvt. Ltd. Greater Noida U.P. 201308 India Advanced System & Technology STMicroelectronics Pvt. Ltd. 20041 Agrate Brianza (MI) Italy

ISBN: (纸本)9781617388767

关键词： buffers output quality coding transcoding information

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SCENE CHANGE ADAPTATION FOR SCALABLE VIDEO CODING

SCENE CHANGE ADAPTATION FOR SCALABLE VIDEO CODING

引用

European signal processing conference

作者： Tea Anselmo Daniele Alfonso Advanced System Technology Labs. STMicroelectronics Via Olivetti 2 20041 Agrate Brianza Italy

ISBN: (纸本)9781617388767

This document presents a Scene Change Adaptation method for the Scalable Video Coding extension ofH.264/AVC. Our method is based on a scene change detection algorithm that identifies transitions in video sequences by using the motion information provided by the pre-analysis phase of a Fast Motion Estimation algorithm based on spatial-temporal motion correlation. Intra coding picture is imposed at the end of the Group Of Pictures containing the scene change, thus dynamically adapting the sequence structure to the scene content and preventing the propagation of the prediction error due to scene change. The proposed algorithm has been also combined with a Buffer-Based Constant Bit-Rate control algorithm, which ensures HRD buffer compliance and target bit-rate requirements. Simulation results show that the SCD algorithm can improve the global coding efficiency and the local visual quality when a scene change occurs.

关键词： Videotapes Change detection algorithms Error of prediction Computer algorithms picture scalable video scalable video coding

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IPTV-P2P Clients at Home

IPTV-P2P Clients at Home

引用

International Conference on systems, Signals and Image Processing, IWSSIP

作者： Alexandro Sentinelli Gustavo Marfia Giovanni Pau Luca Celetto Advanced System Technology STMicroelectronics Milan Italy University of California Los Angeles Los Angeles CA USA

The investigation around the use of peer-to-peer in IPTV environments goes on. The debate about the best compromise between the cost reduction offered by the peer-to-peer (P2P) approach and the quality requirements by the mass market is still open. Though some successful protocols are already worldwide used, there are still issues and optimization problems to solve. The main contribution of this work has been the deployment on PlanetLab (Plab) of a large testbed in order to investigate the performance of [P2P client streaming player] systems in static and dynamic overlays: the goal was to recreate a real IPTV-like heterogeneous scenario with home users enjoying the same stream and cooperating via P2P. IPTV needs bandwidth and computational resources that single peers often struggle to provide. We chose the SopCast client for our experiments, mainly because of its popularity and its flexibility. Although SopCast analysis was not our main research purpose, we are able to point out some of its characteristics by observing its behavior in large and dynamic overlay, with different churn patterns (i.e. zapping channel behaviors).

关键词： IPTV Peer to peer computing Costs Streaming media Extraterrestrial measurements TV broadcasting Protocols system testing Bandwidth Pattern analysis

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Multi-compartment: A new architecture for secure co-hosting on SoC

Multi-compartment: A new architecture for secure co-hosting ...

引用

IEEE International Symposium on system-on-Chip

作者： Joël Porquet Christian Schwarz Alain Greiner LIP6-SoC Laboratory University of Paris-VI Paris France Advanced System Technology STMicroelectronics Rousset France

Multi-compartment is a flexible, lightweight architecture for embedded systems that allows multiple protection domains (compartments) to securely share processing, memory and other system resources. Compartments run in physical address space and enjoy direct access to security-critical initiator devices, such as DMA devices, while remaining protected from one another.

关键词： Protection Embedded system Hardware Embedded software Application software Memory management Virtual manufacturing Network-on-a-chip Laboratories Operating systems

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