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Circuits and Systems for Video Technology, IEEE Transactions on

Issue 10 • Date Oct. 2004

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Displaying Results 1 - 11 of 11
  • Table of contents

    Page(s): c1
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  • IEEE Transactions on Circuits and Systems for Video Technology publication information

    Page(s): c2
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  • A robust and adaptive rate control algorithm for object-based video coding

    Page(s): 1167 - 1182
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB) |  | HTML iconHTML  

    This paper proposes a rate control algorithm for single and multiple objects video coding. The algorithm exploits prediction and feedback control to achieve accurate bit rate while maximizing the picture quality and simultaneously effectively handling buffer fullness. The algorithm estimates the bit budget of a frame based on its global coding complexity, and dynamically distributes the target bits for each object within a frame according to the object's coding complexity. Exploiting a novel buffer controller based on the proportional-integral-derivative (PID) technique used in automatic control systems, the algorithm effectively reduces the deviation between the current buffer fullness and the target buffer fullness, and minimizes the buffer overflow or underflow. The algorithm dynamically adjusts several parameters to further improve the system performance. A scene-change handling method is used to deal with scene changes. The combination of prediction and feedback control improves the adaptability of the rate controller under complicated environments; it also decreases the effect of random disturbance and the deviation caused by the variance between the real system and its statistical model. Overall, the proposed algorithm successfully achieves accurate target bit rate, provides promising coding quality, decreases buffer overflow/underflow and lowers the impact of a scene change. View full abstract»

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  • Bidirectional MC-EZBC with lifting implementation

    Page(s): 1183 - 1194
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3832 KB) |  | HTML iconHTML  

    In conventional motion-compensated three-dimensional subband/wavelet coding, where the motion compensation is unidirectional, incorrect classification of connected and unconnected pixels caused by incorrect motion vectors (MVs) has resulted in some coding inefficiency and visual artifacts in the embedded low-frame-rate video. In this paper, we introduce bidirectional motion compensated temporal filtering with unconnected pixel detection and I blocks. We also incorporate a recently suggested lifting implementation of the subband/wavelet filter for improved MV accuracy in an MC-EZBC coder. Simulation results compare PSNR performance of this new version of MC-EZBC versus H.26L under the constraint of equal groups of pictures size, and show a general parity with this state-of-the-art nonscalable coder on several test clips. View full abstract»

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  • Optimal data partitioning of MPEG-2 coded video

    Page(s): 1195 - 1209
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1704 KB) |  | HTML iconHTML  

    We analyze the problem of optimal data partitioning of MPEG-2 coded video in an operational rate-distortion context. The optimal algorithm is characterized and shown to have high complexity and delay. A causally optimal algorithm based on Lagrangian optimization is proposed, that optimally solves the problem for intra (I) pictures, and provides an optimal solution for predicted/interpolated (P/B) pictures when the additional constraints of causal operation and/or low-delay are imposed. A memoryless version of the algorithm, theoretically optimal for intrapictures only, is shown to perform almost identically but with significantly less computational complexity. Finally, a fast, suboptimal algorithm using purely rate-based optimization is also proposed, and is shown to perform quite close (within 1 dB) to the causally optimal one. Experimental results are provided using actual MPEG-2 coded video bitstreams. View full abstract»

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  • Enhanced hexagonal search for fast block motion estimation

    Page(s): 1210 - 1214
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (344 KB) |  | HTML iconHTML  

    Fast block motion estimation normally consists of low-resolution coarse search and the following fine-resolution inner search. Most motion estimation algorithms developed attempt to speed up the coarse search without considering accelerating the focused inner search. On top of the hexagonal search method recently developed, an enhanced hexagonal search algorithm is proposed to further improve the performance in terms of reducing number of search points and distortion, where a novel fast inner search is employed by exploiting the distortion information of the evaluated points. Our experimental results substantially justify the merits of the proposed algorithm. View full abstract»

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  • Erratum

    Page(s): 1215 - 1216
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  • 2005 IEEE International Symposium on Circuits and Systems (ISCAS 2005)

    Page(s): 1217
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  • IEEE 2005 International Conference on Image Processing

    Page(s): 1218
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  • IEEE Circuits and Systems Society Information

    Page(s): c3
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  • IEEE Transactions on Circuits and Systems for Video Technology Information for authors

    Page(s): c4
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Aims & Scope

The emphasis is focused on, but not limited to:
1. Video A/D and D/ A
2. Video Compression Techniques and Signal Processing
3. Multi-Dimensional Filters and Transforms
4. High Speed Real-Tune Circuits
5. Multi-Processors Systems—Hardware and Software
6. VLSI Architecture and Implementation for Video Technology 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Dan Schonfeld
Multimedia Communications Laboratory
ECE Dept. (M/C 154)
University of Illinois at Chicago (UIC)
Chicago, IL 60607-7053
tcsvt-eic@tcad.polito.it

Managing Editor
Jaqueline Zelkowitz
tcsvt@tcad.polito.it