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    ASIA unversity > 資訊學院 > 資訊傳播學系 > 期刊論文 >  Item 310904400/111645

    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/111645

    Title: Removal of salt-and-pepper noise for X-ray bio-images using pixel-variation gain factors
    Authors: 陸清達;Lu, Ching-Ta;陳牧言;Chen, Mi-Yen;沈俊宏;SHEN, JUN-HONG;王玲玲;Wang, Ling-Ling;許志群;Hsu, Chih-Chan
    Contributors: 資訊傳播學系
    Date: 2018-10
    Issue Date: 2018-12-24 16:23:30 (UTC+8)
    Abstract: Salt-and-pepper (SAP) noise may degrade the bio-images at the time of capturing or transmission. In this paper, we propose a gain factor adapted by a noise-free pixel number and pixel variation for the removal of the impulse noise. All pixels with a non-extreme gray level value are sorted in an ascending order and are grouped according to the gray level variation of pixels in an analysis window. The distribution ratio and median value of each group are computed to determine the values of the gain factors. They are multiplied with the median value of each group to obtain a weighted value which is employed to replace the center pixel with an extreme gray level value, enabling noise-corrupted pixels to be reconstructed. Experimental results show that the proposed approach can effectively remove SAP noise from a corrupted bio-image for various noise corruption densities; meanwhile, the denoised bio-image is not blurred.
    Appears in Collections:[資訊傳播學系] 期刊論文

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