Fast LOT with Unequal Length Basis Functions : Realization and Application in Subband Image Coding
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概要
- 論文の詳細を見る
In this paper, the Lapped Orthogonal Transform (LOT) with unequal length basis function is considered. The proposed unequal length LOT (ULLOT) has both long basis of length 2M and short basis of length M, while the lengths of all bases of the conventional LOT are 2M. A new class of LOT can be constructed with some modifications of Malvar's Fast LOT. Therefore, the fast algorithm for the Discrete Cosine Transform(DCT) will surely facilitate the computation of the ULLOT. Although the computational complexity of the ULLOT is always lower than that of the LOT there exist some cases where the coding gain of the ULLOT becomes slightly higher than that of the LOT. Its ability to reduce ringing artifacts is an attractive feature as well. The size-limited structure for the finite length signal is investigated and the ULLOTs are tested on image coding application. The simulation results confirm the validity of the proposed ULLOT.
- 社団法人電子情報通信学会の論文
- 1999-05-25
著者
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Nagai Takayuki
Department Of Geriatric Medicine Ehime University Graduate School Of Medicine
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Nagai Takayuki
The University of Electro Communications
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Ikehara Masaaki
Department Of Electrical Engineering Keio University
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Nagai T
The University Of Electro Communications
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Nagai Takayuki
Department Of Electrical Engineering Keio University
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Nagai Takayuki
Department of Basic Research, Oriental Medicine Research Center, Kitasato University
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