Visual quality enhancement for DCT-domain spatial downscaling transcoding using generalized DCT decimation

ASIAIR > College of Computer Science > Department of Information Communication > Journal Article > Item 310904400/19055

Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/19055

Title:	Visual quality enhancement for DCT-domain spatial downscaling transcoding using generalized DCT decimation
Authors:	李育瑞;Lee, Yuh-Ruey
Contributors:	資訊傳播學系
Date:	2007-08
Issue Date:	2012-11-26 07:16:27 (UTC+0)
Abstract:	Abstract—In this paper, we propose a generalized discrete cosine transform (DCT) decimation scheme for DCT-domain spatial downscaling which performs two-fold decimation on subframes of a ﬂexible size larger than the traditional 8 8 block size to improve the visual quality. Efﬁcient sparse-matrix representations are then derived to reduce the computation of the proposed DCT decimation method. We compare the antialiasing ﬁltering performances and computational complexities of the proposed downscaling scheme with the existing DCT-domain and pixel-domain downscaling schemes. Our analysis shows that the proposed scheme can reduce the aliasing artifact compared to the pixel-domain downscaling schemes, whereas the computational complexity may be increased. Experimental results are reported to show the efﬁcacy of the proposed approach.
Relation:	IEEE Transactions on Circuits and Systems for Video Technology
Appears in Collections:	[Department of Information Communication] Journal Article

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