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

Hiroshi HASEGAWA  Toshiyuki ONO  Isao YAMADA  Kohichi SAKANIWA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E88-A   No.9   pp.2427-2435
Publication Date: 2005/09/01
Online ISSN: 
DOI: 10.1093/ietfec/e88-a.9.2427
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Image
super-resolution,  MPEG video,  set-theoretic approach,  outer approximation,  adaptive projected subgradient method,  

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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.