Adaptive Threshold Selection of Anisotropic Diffusion Filters Using Dissimilarity Transform

Year 2023, Volume: 15 Issue: 2, 558 - 573, 14.07.2023

Mahmut Kılıçaslan

https://doi.org/10.29137/umagd.1268609

Abstract

One of the most basic steps of image processing is denoising. Diffusion filters have been used for denoising for many years, as they protect the edges. The common problem of diffusion filters, which are still being developed today, is the user intervention requirements. The diffusion threshold value is currently selected by the user. In this study, a fully adaptive threshold value selection method is presented with the help of dissimilarity transform. The main contribution of the study is the proposal of dissimilarity transformation for anisotropic diffusion filters. Experimental results show that the threshold values determined by the proposed method effectively provide denoising without being affected by noise variance and preserve the edges.

Keywords

Anistropic diffusion filter, Adaptive threshold selection, Dissimilarity Transform, Denoising

Benzemezlik Dönüşümü Kullanarak Anizotropik Difüzyon Filtresinin Uyarlanabilir Eşik Seçimi

Abstract

Görüntü işlemenin en temel adımlarından biri gürültü filtreleridir. Difüzyon filtreleri, kenarları koruduklarından dolayı uzun yıllardır gürültü giderme amacıyla kullanılmaktadır. Günümüzde hala geliştirilmekte olan difüzyon filtrelerinin ortak sorunu kullanıcı müdahalesi gereksinimleridir. Difüzyon eşik değerinin belirlenmesi kullanıcı bağımlı bir aşamadır. Bu çalışmada benzemezlik dönüşümü yardımıyla tam uyarlanabilir bir eşik değer seçim yöntemi sunulmaktadır. Çalışmanın temel katkısı, anizotropik difüzyon filtreleri için benzemezlik dönüşümü önerisidir. Deneysel sonuçlar, önerilen yöntemle belirlenen eşik değerlerinin gürültü varyansından etkilenmeden gürültü gidermeyi etkin bir şekilde sağladığını ve kenarları koruduğunu göstermektedir.

Keywords

Anizotropik difüzyon filtresi, Uyarlanabilir eşik seçimi, Benzemezlik dönüşümü, Gürültü

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