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スプライン補間による画像の引き伸ばし Enlargement of Digital Photograph by Spline Interpolation スプライン ホカン ニヨル ガゾウ ノ ヒキノバシ 加藤, 友彦 村田, 真司 enlargement of photograph large scale enlarging spline interpolation linear interpolation LU factorization enlargement of photograph large scale enlarging spline interpolation linear interpolation LU factorization application/pdf 論文(Article) A spline interpolation method is applied to enlargement of digital photographs. The conventional method of the linear interpolation is useful at least for several times enlargements. In larger scale enlargements, however, a smooth image cannot be expected by the linear interpolation. In this paper, the natural cubic spline functions are employed with an ingenuous algorism based on the LU factorization for tridiagonal matrices. An eight times enlarged photograph obtained by the spline method is compared with that provided by the linear method and one observes that the former image has better quality than the latter one. It is expected that such advantage of the spline method becomes more illustrative in the case of larger scale enlargements. 福岡工業大学 2008-02-29 jpn departmental bulletin paper VoR http://hdl.handle.net/11478/947 https://fit.repo.nii.ac.jp/records/430 02876620 AN10036974 福岡工業大学研究論集 40 2 263 266 https://fit.repo.nii.ac.jp/record/430/files/11478-947_p263加藤　友彦.pdf application/pdf 429.3 kB 2020-09-14