Neighborhood Filters and the Decreasing Rearrangement

作者：Galiano Gonzalo^*; Velasco Julian

来源：Journal of Mathematical Imaging and Vision, 2015, 51(2): 279-295.

DOI：10.1007/s10851-014-0522-3

• Neighborhood filters
• Decreasing rearrangement
• Denoising
• Segmentation

Nonlocal filters are simple and powerful techniques for image denoising. In this paper, we give new insights into the analysis of one kind of them, the Neighborhood filter, by using a classical although not commonly used transformation: the decreasing rearrangement of a function. Independently of the dimension of the image, we reformulate the Neighborhood filter and its iterative variants as an integral operator defined in a one-dimensional space. The simplicity of this formulation allows to perform a detailed analysis of its properties. Among others, we prove that the filtered image is a contrast change of the original image, an that the filtering procedure behaves asymptotically as a shock filter combined with a border diffusive term, responsible for the staircaising effect and the loss of contrast.

• 出版日期2015-2