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An iterative MPEG super-resolution with an outer approximation of framewise quantization constraint

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4 Author(s)
Hasegawa, H. ; Dept. of Commun. & Integrated Syst., Tokyo Inst. of Technol., Japan ; Ono, T. ; Yamada, I. ; Sakaniwa, K.

In this paper, we present a novel iterative MPEG super-resolution method based on an embedded constraint version of adaptive projected subgradient method [Yamada & Ogura 2003]. We propose an efficient operator that approximates convex projection onto a set characterizing framewise quantization, whereas a conventional method can only handle a convex projection defined for each DCT coefficient of a frame. By using the operator, the proposed method generates a sequence that efficiently approaches to a solution of super-resolution problem defined in terms of quantization error of MPEG compression.

Published in:

Multimedia Signal Processing, 2004 IEEE 6th Workshop on

Date of Conference:

29 Sept.-1 Oct. 2004

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