A super-resolution image recovery of movies with an outer approximation of framewise MPEG quantization constraint

In this paper, we propose an iterative MPEG super-resolution method based on adaptive projected subgradient method as stated in Yamada and 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 converges to a solution of super-resolution problem defined in terms of quantization error of MPEG compression.