An Iterative MPEG Super-Resolution with an Outer Approximation of Framewise Quantization Constraint

Authors:
Hiroshi Hasegawa;Toshiyuki Ono;Isao Yamada;Kohichi Sakaniwa
Affiliations:
The author is with the Dept. of Electrical Engineering & Computer Science, Nagoya University, Nagoya-shi, 464-8603 Japan. E-mail: hasegawa@nuee.nagoya-u.ac.jp,;The authors are with the Dept. of Communications & Integrated Systems, Tokyo Institute of Technology, Tokyo, 152-8552 Japan.;The authors are with the Dept. of Communications & Integrated Systems, Tokyo Institute of Technology, Tokyo, 152-8552 Japan.;The authors are with the Dept. of Communications & Integrated Systems, Tokyo Institute of Technology, Tokyo, 152-8552 Japan.
Venue:
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Year:
2005

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Abstract

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.