Adaptive transform based on statistical modeling of inter-frame prediction error = 화면간 예측 오차의 통계적 모델링에 기반한 적응적 변환 기법

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Several video coding standards have been developed for many applications. Commonly, these standards have adopted the hybrid block-based video coding scheme that transforms the residual block generated as the difference between the original and spatially/temporally predicted block. In order to reduce the amount of bits, many researchers focused on the intra/inter-frame prediction step and then these standards have provided various prediction methods. On the other hand, most standards have used the discrete cosine transform (DCT), known to be near optimal for original images, to transform prediction errors. Since the statistical characteristics of prediction errors are quite different from those of original images, a more suitable transform for prediction errors has to be devised. In this dissertation, we propose a new architecture of transform coding for Inter-frame Prediction Error (IPE) signal. In order to develop the system, we first derive a new statistical model which changes with each input IPE block adaptively. The model is based on assumptions that follow a first-order stationary Markov process in time domain and approximate the pixel-wisely unknown motion fluctuation with some physical motion models. We then devise a new transform based on the statistical modeling, which has no side information to be sent to the decoder. In addition, in order to reduce the computation time, we present a modified version for accelerating the transform using rank-one modification series. From the observation that the optimal transform of IPE block referencing a nearly uniform block is in fact identical to the Karhunen-L??eve transform (KLT) of natural images, we further reduce the computational complexity using DCT for the IPE blocks. Experiments on well-known image sequences confirm that our proposed transform can improve the performance of transform coding significantly.
Advisors
Kim, Seong-Daeresearcher김성대researcher
Description
한국과학기술원 : 전기 및 전자공학과,
Publisher
한국과학기술원
Issue Date
2011
Identifier
466451/325007  / 020045163
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기 및 전자공학과, 2011.2, [ vi, 87 p. ]

Keywords

inter-frame prediction error; covariance function; adaptive transform; rank-one modification; 랭크-1 수정; 화면간 예측 오차; 공분산 함수; 적응적 변환 기법

URI
http://hdl.handle.net/10203/35638
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=466451&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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