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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
Publication Date: 2005/09/01
Print ISSN: 0916-8508
Type of Manuscript: PAPER
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.