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2001
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The orientation adaptive lapped biorthogonal transform for efficient image coding

11 years 5 months ago
The orientation adaptive lapped biorthogonal transform for efficient image coding
A lapped biorthogonal transform adapted for local directionality of an image is proposed. The proposed transform consists of overlapping basis functions and non-overlapping basis functions, where the basis functions' centers of symmetry are aligned. Because of the alignment, we can treat the image boundaries without special processing. In order to construct non-overlapping basis functions, we also introduce the transform that provides the optimal approximation of an original signal in a given subspace. In image coding, an image block is selectively transformed by one of orientation adaptive transforms. Experimental results show that the use of adaptation improves the quality of decoded images.
Toshihsa Tanaka, Y. Yamashita
Added 25 Oct 2009
Updated 27 Oct 2009
Type Conference
Year 2001
Where ICIP
Authors Toshihsa Tanaka, Y. Yamashita
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