Improved Neighborhood Based Switching Filter for Protecting the Thin Curves in Arbitrary Direction in Color Images

ChangCheng WU  Min WANG  JunJie WANG  WeiMing LUO  JiaFeng HUA  XiTao CHEN  Wei GENG  Yu LU  Wei SUN  

IEICE TRANSACTIONS on Information and Systems   Vol.E103-D   No.9   pp.1939-1948
Publication Date: 2020/09/01
Publicized: 2020/06/03
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2019EDP7329
Type of Manuscript: PAPER
Category: Data Engineering, Web Information Systems
impulse noise,  color image,  thin curve,  arbitrary direction,  

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Although the classical vector median filter (VMF) has been widely used to suppress the impulse noise in the color image, many thin color curve pixels aligned in arbitrary directions are usually removed out as impulse noise. This serious problem can be solved by the proposed method that can protect the thin curves in arbitrary direction in color image and remove out the impulse noise at the same time. Firstly, samples in the 3x3 filter window are considered to preliminarily detect whether the center pixel is corrupted by impulse noise or not. Then, samples outside a 5x5 filter window are conditionally and partly considered to accurately distinguish the impulse noise and the noise-free pixel. At last, based on the previous outputs, samples on the processed positions in a 3x3 filter window are chosen as the samples of VMF operation to suppress the impulse noise. Extensive experimental results indicate that the proposed algorithm can be used to remove the impulse noise of color image while protecting the thin curves in arbitrary directions.