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RATE CONTROL TECHNIQUES FOR H.264/AVC VIDEO WITH
ENHANCED RATE-DISTORTION MODELING
by
Do-Kyoung Kwon
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
December 2006
Copyright 2006 Do-Kyoung Kwon
Object Description
| Title | Rate control techniques for H.264/AVC video with enhanced rate-distortion modeling |
| Author | Kwon, Do-Kyoung |
| Author email | dokwon@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2006-10-18 |
| Date submitted | 2006 |
| Restricted until | Unrestricted |
| Date published | 2006-11-16 |
| Advisor (committee chair) | Kuo, C.-C. Jay |
| Advisor (committee member) |
Ortega, Antonio Neumann, Ulrich |
| Abstract | In this research, we propose rate control algorithms with enhanced rate and distortion modeling for H.264 video in various applications.; We first propose an enhanced rate control scheme for real-time conversational applications. Compared with existing H.264 rate control, the proposed scheme offers several new features. First, the inter-dependency between RDO and rate control is resolved by allowing different quantization parameter values at the RDO process and the quantization process, respectively. Second, to address the increased importance of header bits, a header rate model is established so as to estimate header bits more accurately. To be more specific, the number of header bits is modeled as a function of the number of non-zero MV elements and the number of MVs. Third, a new source rate model and a distortion model are proposed. For this purpose, coded 4x4 blocks are identified and the number of source bits and distortion are modeled as functions of the quantization stepsize and the complexity of coded 4x4 blocks. Built upon the above ideas, a rate control algorithm is developed for real-time conversational applications under the CBR constraint.; For the non-conversational H.264 video that has a fixed GOP (Group of Pictures) structure, we propose frame-layer bit allocation algorithms. Under the assumption of frame's independence, a two-pass algorithm based on the Lagrange optimization framework is proposed first as a fundamental study. Then, to reduce the encoding complexity, an one-pass algorithm via GOP-based rate modeling is proposed based on the Lagrange optimization framework as well. Instead of estimating the R-D data of future frames directly, the one-pass algorithm estimates the Lagrange multiplier using GOP rate models, which characterize the number of bits consumed by a GOP. For this purpose, GOP-based R-Q and R-lambda models are investigated. Finally, we propose a simplified one-pass algorithm by exploiting the monotonicity property. The simplified algorithm does not require any frame rate and distortion model. Thus, the rate control process can be greatly simplified.; The GOP structure may change adaptively according to the spatial and temporal scene contexts. We address the rate control problem with varying GOP structures as well. We point out an important issue in this case, the inter-dependency of frame-layer bit allocation and GOP structure decision, and resolve this problem using the simplified bit allocation scheme and GOP rate and distortion models. Finally, we propose a GOP-layer bit allocation algorithm using GOP rate and distortion models. This algorithm achieves higher average quality as well as smoother visual quality variation. |
| Keyword | H.264/AVC; rate control; bit allocation |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m159 |
| Rights | Kwon, Do-Kyoung |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Kwon-20061116 |
| Archival file | uscthesesreloadpub_Volume17/etd-Kwon-20061116.pdf |
Description
| Title | Page 1 |
| Full text | RATE CONTROL TECHNIQUES FOR H.264/AVC VIDEO WITH ENHANCED RATE-DISTORTION MODELING by Do-Kyoung Kwon A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) December 2006 Copyright 2006 Do-Kyoung Kwon |
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