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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.
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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 exemplar-based method and
good subjective quality.
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