Struktura obiektu

Autor:

Prasath, V.B. Surya

Współtwórca:

Korbicz, Józef - red. ; Uciński, Dariusz - red.

Tytuł:

A well-posed multiscale regularization scheme for digital image denoising

Tytuł publikacji grupowej:

AMCS, Volume 21 (2011)

Temat i słowa kluczowe:

image restoration ; edge-preserving ; regularization ; normalized local variance ; adaptive parameter

Abstract:

We propose an edge adaptive digital image denoising and restoration scheme based on space dependent regularization. Traditional gradient based schemes use an edge map computed from gradients alone to drive the regularization. This may lead to the oversmoothing of the input image, and noise along edges can be amplified. To avoid these drawbacks, we make use of a multiscale descriptor given by a contextual edge detector obtained from local variances. Using a smooth transition from the computed edges, the proposed scheme removes noise in flat regions and preserves edges without oscillations ; By incorporating a space dependent adaptive regularization parameter, image smoothing is driven along probable edges and not across them. The well-posedness of the corresponding minimization problem is proved in the space of functions of bounded variation. The corresponding gradient descent scheme is implemented and further numerical results illustrate the advantages of using the adaptive parameter in the regularization scheme. Compared with similar edge preserving regularization schemes, the proposed adaptive weight based scheme provides a better multiscale edge map, which in turn produces better restoration.

Wydawca:

Zielona Góra: Uniwersytet Zielonogórski

Data wydania:

2011

Typ zasobu:

artykuł

DOI:

10.2478/v10006-011-0061-7

Strony:

769-777

Źródło:

AMCS, Volume 21, Number 4 (2011) ; kliknij tutaj, żeby przejść

Jezyk:

eng

Prawa do dysponowania publikacją:

Biblioteka Uniwersytetu Zielonogórskiego