Fast image enlargement using predefined codebook and eigenspace backprojection for lost pixel |
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| Authors: | Noriaki Suetake Hideaki Kawano Go Tanaka Hidenobu Hashikami Eiji Uchino |
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| Institution: | (1) Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi, Yamaguchi 753-8512, Japan;(2) Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan;(3) Graduate School of Natural Sciences, Nagoya City University, Nagoya 467-8601, Japan;(4) Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan;(5) Fuzzy Logic Systems Institute, Iizuka, Fukuoka 820-0067, Japan |
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| Abstract: | In this paper, a new image enlargement method applying the backprojection for lost pixel (BPLP) to the predefined codebook-based
method is proposed. BPLP is a method for image restoration. In BPLP, the eigenspace reflecting the characteristics of an input
image is generated from the remained pixels and is used to restore the missing pixels. In the proposed method, the eigenspace
is replaced by one generated from the predefined codebook (PDC). PDC represents edge-blurring properties in a small image
patch and consists of pairs of low- and high-frequency image patches on various edge patterns. By replacing the PDC-based
estimation of lost high-frequency components with BPLP, a fast image enlargement method retaining its performance can be developed.
Through some experiments, the effectiveness of the proposed method was demonstrated. Especially, it was confirmed that the
processing time of the proposed method was shortened to about 1/50 that of the PDC-based method. |
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