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Channel adaptive rate control for energy optimization

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第z1期7卷 82-88页

作者： BLANCH Carolina POLLIN Sofie lafruit gauthier EBERLE Wolfgang Interuniversity Microelectronics Center Kapeldreef 75 Leuven 3001Belgium Interdisciplinary Institute for BroadBand TechnologyGent-Ledeberg B-9050Belgium Interuniversity Microelectronics Center Kapeldreef 75 Leuven 3001Belgium Interdisciplinary Institute for BroadBand TechnologyGent-Ledeberg B-9050 Belgium Department of Electrical EngineeringK.U.LeuvenESAT/INSYSBelgium Interuniversity Microelectronics Center Kapeldreef 75 Leuven 3001Belgium

Low energy consumption is one of the main challenges for wireless video transmission on battery limited devices. The energy invested at the lower layers of the protocol stack involved in data communication, such as link and physical layer, represent an important part of the total energy consumption. This communication energy highly depends on the channel conditions and on the transmission data rate. Traditionally, video coding is unaware of varying channel conditions. In this paper, we propose a cross-layer approach in which the rate control mechanism of the video codec becomes channel-aware and steers the instantaneous output rate according to the channel conditions to reduce the communication energy. Our results show that energy savings of up to30% can be obtained with a reduction of barely 0.1 dB on the average video quality. The impact of feedback delays is shown to be small. In addition, this adaptive mechanism has low complexity, which makes it suitable for real-time applications.

关键词： Rate control, Channel condition, Communication energy

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Multi-user Motion JPEG2000 over wireless LAN: run-time performance-energy optimization with application-aware cross-layer scheduling

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第z1期7卷 151-158页

作者： POLLIN Sofie LENOIR Gregory lafruit gauthier DEJONGHE Antoine CATTHOOR Francky Interuniversity Microelectronics Center Kapeldreef 75 Leuven 3001Belgium Department of Electrical EngineeringK.U.LeuvenESAT/INSYSBelgium Interdisciplinary Institute for Broadband TechnologyGent-Ledeberg B-9050 Belgium Interuniversity Microelectronics Center Kapeldreef 75 Leuven 3001Belgium Interdisciplinary Institute for Broadband TechnologyGent-Ledeberg B-9050Belgium Interuniversity Microelectronics Center Kapeldreef 75 Leuven 3001Belgium Interuniversity Microelectronics Center Kapeldreef 75 Leuven 3001Belgium Department of Electrical EngineeringK.U.LeuvenESAT/INSYSBelgium

This paper introduces a video application-aware cross-layer framework for joint performance-energy optimization,considering the scenario of multiple users upstreaming real-time Motion JPEG2000 video streams to the access point of a WiFi wireless local area network and extends the PHY-MAC run-time cross-layer scheduling strategy that we introduced in (Mangharam et al., 2005; Pollin et al., 2005) to also consider congested network situations where video packets have to be dropped. We show that an optimal solution at PHY-MAC level can be highly suboptimal at application level, and then show that making the cross-layer framework application-aware through a prioritized dropping policy capitalizing on the inherent scalability of Motion JPEG2000 video streams leads to drastic average video quality improvements and inter-user quality variation reductions of as much as 10 dB PSNR, without affecting the overall energy consumption requirements.

关键词： Performance-energy optimization, Application-aware scheduling, Motion JPEG2000, WLAN multi-user transmission

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维普期刊数据库

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Color retargeting:Interactive time-varying color image composition from time-lapse sequences

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Computational Visual Media 2015年第4期1卷 321-330页

作者： Shao-Ping Lu Guillaume Dauphin gauthier lafruit Adrian Munteanu Department of Electronics and Informatics(ETRO) Vrije Universiteit Brussel (VUB) and iMinds Department of LISA unit ImageUniversité Libre de Bruxelles(ULB)

In this paper,we present an interactive static image composition approach,namely color retargeting,to flexibly represent time-varying color editing effect based on time-lapse video *** of performing precise image matting or blending techniques,our approach treats the color composition as a pixel-level resampling problem. In order to both satisfy the user's editing requirements and avoid visual artifacts,we construct a globally optimized interpolation field. This field defines from which input video frames the output pixels should be *** proposed resampling solution ensures that(i) the global color transition in the output image is as smooth as possible,(ii) the desired colors/objects specified by the user from different video frames are well preserved,and(iii) additional local color transition directions in the image space assigned by the user are also *** examples have been shown to demonstrate that our efficient solution enables the user to easily create time-varying color image composition results.

关键词： time-lapse sequence image composition color retargeting time-varying transition optimized interpolation field

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维普期刊数据库

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