title: Image inpainting on the basis of spectral structure from 2-D nonharmonic analysis.
abstract: The restoration of images by digital inpainting is an active field of research and such algorithms are, in fact, now widely used. Conventional methods generally apply textures that are most similar to the areas around the missing region or use a large image database. However, this produces discontinuous textures and thus unsatisfactory results. Here, we propose a new technique to overcome this limitation by using signal prediction based on the nonharmonic analysis (NHA) technique proposed by the authors. NHA can be used to extract accurate spectra, irrespective of the window function, and its frequency resolution is less than that of the discrete Fourier transform. The proposed method sequentially generates new textures on the basis of the spectrum obtained by NHA. Missing regions from the spectrum are repaired using an improved cost function for 2D NHA. The proposed method is evaluated using the standard images Lena, Barbara, Airplane, Pepper, and Mandrill. The results show an improvement in MSE of about 10-20 compared with the examplar-based method and good subjective quality.
authors.affiliation: Department of Graduate School of Science and Engineering for Education, University of Toyama, Toyama 9308555, Japan.
authors.forename: Masaya
authors.initials: M
authors.lastname: Hasegawa
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kako
authors.forename: Shigeki
authors.initials: S
authors.lastname: Hirobayashi
authors.forename: Tadanobu
authors.initials: T
authors.lastname: Misawa
authors.forename: Toshio
authors.initials: T
authors.lastname: Yoshizawa
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Inazumi
mesh_terms: D000465:Algorithms; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009716:Numerical Analysis, Computer-Assisted; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity