Band-Pass ε-Filter for Edge Enhancement and Noise Removal

Mitsuharu MATSUMOTO  

IEICE TRANSACTIONS on Information and Systems   Vol.E93-D   No.2   pp.367-375
Publication Date: 2010/02/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E93.D.367
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Image Processing and Video Processing
noise reduction,  edge enhancement,  nonlinear filter,  band-pass ε-filter,  

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A band-pass bilateral filter is an improved variant of a bilateral filter that does not have low-pass characteristics but has band-pass characteristics. Unfortunately, its computation time is relatively large since all pixels are subjected to Gaussian calculation. To solve this problem, we pay attention to a nonlinear filter called ε-filter and propose an advanced ε-filter labeled band-pass ε-filter. As ε-filter has low-pass characteristics due to spatial filtering, it does not enhance the image contrast. On the other hand, band-pass ε-filter does not have low-pass characteristics but has band-pass characteristics to enhance the image contrast around edges unlike ε-filter. The filter works not only as a noise reduction filter but also as an edge detection filter depending on the filter setting. Due to its simple design, the calculation cost is relatively small compared to the band-pass bilateral filter. To show the effectiveness of the proposed method, we report the results of some comparison experiments on the filter characteristics and computational cost.