An-edge preserving multigrid-like for image denoising and inpainting / Uma técnica multimalhas para eliminação de ruídos e retoque digita"

AUTOR(ES)

Carolina Toledo Ferraz

DATA DE PUBLICAÇÃO

2006

RESUMO

Techniques based on the Well-Balanced Flow Equation have been employed as an efficient tool for edge preserving noise removal. Although effective, this technique demands high computational effort, rendering it not practical in several applications. This work aims at proposing a multigrid-like technique for speeding up the solution of the Well- Balanced Flow equation. In fact, the diffusion equation is solved in a coarse grid and a coarse-to-fine error correction is applied in order to generate the desired solution. The transfer between coarser and finer grids is made by the Mitchell-Filter, a well known interpolation scheme that is designed for preserving edges. Furthermore, the solution of the transport and the Mean Curvature Flow equations is adapted to the multigrid like technique for image inpainting and denoising. Numerical results are compared quantitative and qualitatively with other approaches, showing that our method produces similar image quality with much lower computational time.

ASSUNTO(S)

processing of digital image image restoration difusão noise removal mitchell-filter eliminação de ruídos retoque digital de imagens diffusion multigrid methods filtro de mitchell método multigrid processamento digital de imagens image inpaiting reconstrução de imagens

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