The Experts below are selected from a list of 3525 Experts worldwide ranked by ideXlab platform
Sam Kwong - One of the best experts on this subject based on the ideXlab platform.
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window level rate control for smooth picture quality and smooth Buffer Occupancy
IEEE Transactions on Image Processing, 2011Co-Authors: Long Xu, Lei Deng, Xiangyang Ji, Debin Zhao, Sam KwongAbstract:In rate control, smooth picture quality and smooth Buffer Occupancy are both important but contrary to each other at a given bit rate. How to get a good tradeoff between them was not devoted much attention previously. To deal with this problem, a theoretical window model is proposed in this paper, in which several adjacent frames grouped as a window are considered together. The smoothness of both picture quality and Buffer Occupancy can be gracefully achieved by regulating the size of the window. To illustrate the usage of window model, a window-level rate control algorithm cooperated with the traditional ρ-domain rate-distortion model is further introduced. In experiments, we first show how the proposed window model achieves the tradeoff between picture quality smoothness and Buffer smoothness, and then demonstrate the significant PSNR improvement, accuracy of bit control and consistency of visual quality of the proposed window-level rate control algorithm.
Yin Min - One of the best experts on this subject based on the ideXlab platform.
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A Rate-based PD Congestion Controller
Computer Engineering, 2003Co-Authors: Yin MinAbstract:With regard to the flow regulation of the best-effort traffic, i.e., the controllable traffic in high-speed computer communication networks, the present paper proposes a novel control theoretic approach that designs a proportional-plus-derivative (PD) controller for congestion controlling. Based on the traffic model of multi-source node and single destination node and on system stability criterion, it shows that the PD controller can regulate the source rate on the basis of the knowledge of Buffer Occupancy of the destination node in such a manner that the congestion-controlled network is asymptotic stable without oscillation in terms of the Buffer Occupancy of the destination node. Simulations show good performance of such controlled networks.
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A Rate-Based PI Congestion Controller for High-Speed Computer Communication Networks
2002Co-Authors: Yin MinAbstract:With regard to the flow regulation of the best-effort traffic,i.e.,the controllable traffic in high-speed computer communication networks,the present paper proposes a novel control theoretic approach that designs a proportional-plus-integrative (PI) controller for congestion controlling.Based on the traffic model of a single node and on system stability criterion,it is shown that the PI controller can regulate the source rate on the basis of the knowledge of Buffer Occupancy of the destination node in such a manner that (1) the congestion-controlled network is asymptotically stable without oscillation in terms of the Buffer Occupancy of the destination node;and (2) the steady value of queue length is consistent with the specified threshold value.Simulations show good performance of such controlled networks
Long Xu - One of the best experts on this subject based on the ideXlab platform.
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window level rate control for smooth picture quality and smooth Buffer Occupancy
IEEE Transactions on Image Processing, 2011Co-Authors: Long Xu, Lei Deng, Xiangyang Ji, Debin Zhao, Sam KwongAbstract:In rate control, smooth picture quality and smooth Buffer Occupancy are both important but contrary to each other at a given bit rate. How to get a good tradeoff between them was not devoted much attention previously. To deal with this problem, a theoretical window model is proposed in this paper, in which several adjacent frames grouped as a window are considered together. The smoothness of both picture quality and Buffer Occupancy can be gracefully achieved by regulating the size of the window. To illustrate the usage of window model, a window-level rate control algorithm cooperated with the traditional ρ-domain rate-distortion model is further introduced. In experiments, we first show how the proposed window model achieves the tradeoff between picture quality smoothness and Buffer smoothness, and then demonstrate the significant PSNR improvement, accuracy of bit control and consistency of visual quality of the proposed window-level rate control algorithm.
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window level rate control for smooth picture quality and smooth Buffer Occupancy
Picture Coding Symposium, 2009Co-Authors: Long Xu, Zhihang Wang, Lei Deng, Xiangyang Ji, Debin ZhaoAbstract:Traditionally, rate control consists of bit allocation and QP decision on R-QP model. In bit allocation, target bits is further confined if Buffer overflows. Meanwhile, rate control should also give as smooth as possible picture quality. However, there is no explicit relationship between picture quality and encoding parameters, so the coding result on picture quality is usually unpredictable and uncontrollable. On the condition of smooth picture quality, the smooth Buffer Occupancy is preferable certainly. In our work, we first proposed a “window model” formulating the size of window and variations of picture quality and Buffer Occupancy. Thus, given the constraint on picture quality and Buffer Occupancy, the compliant coding result about them can be expected employing window model. Second, a window-level rate distortion (RD) model inspired by the traditional ρ-domain model is introduced. Lastly, the evaluation of our proposal is presented with elaborate experiments.
Ikuo Oka - One of the best experts on this subject based on the ideXlab platform.
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2d sliced packet Buffer with traffic volume and Buffer Occupancy adaptation for power saving
Consumer Communications and Networking Conference, 2013Co-Authors: Kenzo Okuda, Shingo Ata, Yasuto Kuroda, Yuji Yano, Hisashi Iwamoto, Kazunari Inoue, Ikuo OkaAbstract:Recently, energy consumption of routers has become a serious problem, hence power reduction is an urgent and important challenge. Existing routers always work 100% of their potentials regardless of required performance, such as volume of input traffic. However, semiconductor devices such as lookup logics, Buffers, fabrics are not always fully utilized. In particular, the Occupancy of packet Buffer is very low in many cases, especially in core routers, which leads to unnecessary consumption of electric power. To solve this problem, a new Buffer architecture called Sliced Packet Buffer was proposed. Dividing a whole Buffer into multiple sub Buffers (called slices) at the LSI level enables to control power management independently according to its Occupancy. However, input traffic rate is another parameter for further power savings, which was not considered so far. In this paper, we propose a Two Dimensional Sliced Packet Buffer which enables power management according to not only the Buffer Occupancy but also the traffic volume. We also propose a model of accurate performance evaluation on energy consumption in the granularity of operational instruction. Through trace-driven simulations with real traffic, we show that our proposed packet Buffer can reduce an average 66% of power consumption when an average input rate is 30%.
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CCNC - 2D Sliced Packet Buffer with traffic volume and Buffer Occupancy adaptation for power saving
2013 IEEE 10th Consumer Communications and Networking Conference (CCNC), 2013Co-Authors: Kenzo Okuda, Shingo Ata, Yasuto Kuroda, Yuji Yano, Hisashi Iwamoto, Kazunari Inoue, Ikuo OkaAbstract:Recently, energy consumption of routers has become a serious problem, hence power reduction is an urgent and important challenge. Existing routers always work 100% of their potentials regardless of required performance, such as volume of input traffic. However, semiconductor devices such as lookup logics, Buffers, fabrics are not always fully utilized. In particular, the Occupancy of packet Buffer is very low in many cases, especially in core routers, which leads to unnecessary consumption of electric power. To solve this problem, a new Buffer architecture called Sliced Packet Buffer was proposed. Dividing a whole Buffer into multiple sub Buffers (called slices) at the LSI level enables to control power management independently according to its Occupancy. However, input traffic rate is another parameter for further power savings, which was not considered so far. In this paper, we propose a Two Dimensional Sliced Packet Buffer which enables power management according to not only the Buffer Occupancy but also the traffic volume. We also propose a model of accurate performance evaluation on energy consumption in the granularity of operational instruction. Through trace-driven simulations with real traffic, we show that our proposed packet Buffer can reduce an average 66% of power consumption when an average input rate is 30%.
Debin Zhao - One of the best experts on this subject based on the ideXlab platform.
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window level rate control for smooth picture quality and smooth Buffer Occupancy
IEEE Transactions on Image Processing, 2011Co-Authors: Long Xu, Lei Deng, Xiangyang Ji, Debin Zhao, Sam KwongAbstract:In rate control, smooth picture quality and smooth Buffer Occupancy are both important but contrary to each other at a given bit rate. How to get a good tradeoff between them was not devoted much attention previously. To deal with this problem, a theoretical window model is proposed in this paper, in which several adjacent frames grouped as a window are considered together. The smoothness of both picture quality and Buffer Occupancy can be gracefully achieved by regulating the size of the window. To illustrate the usage of window model, a window-level rate control algorithm cooperated with the traditional ρ-domain rate-distortion model is further introduced. In experiments, we first show how the proposed window model achieves the tradeoff between picture quality smoothness and Buffer smoothness, and then demonstrate the significant PSNR improvement, accuracy of bit control and consistency of visual quality of the proposed window-level rate control algorithm.
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window level rate control for smooth picture quality and smooth Buffer Occupancy
Picture Coding Symposium, 2009Co-Authors: Long Xu, Zhihang Wang, Lei Deng, Xiangyang Ji, Debin ZhaoAbstract:Traditionally, rate control consists of bit allocation and QP decision on R-QP model. In bit allocation, target bits is further confined if Buffer overflows. Meanwhile, rate control should also give as smooth as possible picture quality. However, there is no explicit relationship between picture quality and encoding parameters, so the coding result on picture quality is usually unpredictable and uncontrollable. On the condition of smooth picture quality, the smooth Buffer Occupancy is preferable certainly. In our work, we first proposed a “window model” formulating the size of window and variations of picture quality and Buffer Occupancy. Thus, given the constraint on picture quality and Buffer Occupancy, the compliant coding result about them can be expected employing window model. Second, a window-level rate distortion (RD) model inspired by the traditional ρ-domain model is introduced. Lastly, the evaluation of our proposal is presented with elaborate experiments.
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PCS - Window-level rate control for smooth picture quality and smooth Buffer Occupancy
2009 Picture Coding Symposium, 2009Co-Authors: Zhihang Wang, Lei Deng, Debin Zhao, Wen GaoAbstract:Traditionally, rate control consists of bit allocation and QP decision on R-QP model. In bit allocation, target bits is further confined if Buffer overflows. Meanwhile, rate control should also give as smooth as possible picture quality. However, there is no explicit relationship between picture quality and encoding parameters, so the coding result on picture quality is usually unpredictable and uncontrollable. On the condition of smooth picture quality, the smooth Buffer Occupancy is preferable certainly. In our work, we first proposed a “window model” formulating the size of window and variations of picture quality and Buffer Occupancy. Thus, given the constraint on picture quality and Buffer Occupancy, the compliant coding result about them can be expected employing window model. Second, a window-level rate distortion (RD) model inspired by the traditional ρ-domain model is introduced. Lastly, the evaluation of our proposal is presented with elaborate experiments.
