关键词: 彩色图像滤波, 脉冲噪声, 噪声检测, 迭代滤波算法

Abstract: As to the color images corrupted by impulse noise，a series of iterative filtering algorithm based on noise detection is proposed.An impulse detector is presented to find out all pixels that are considered as noise before filtering.If a pixel is considered as noise，it will be replaced by a pixel in the neighborhood which is noise-free during filtering procedure later;otherwise，it is unchanged.The conventional filters are improved as the filtering algorithm later.The conventional filters include the vector median filter，the basic vector directional filter，and the directional distance filter.As demonstrated by the extensive experimental results，all the proposed filtering methods compare favorably with conventional techniques in the capabilities of noise attenuation and details preservation，in both quantitative and qualitative measures.

Key words: color image filtering, impulse noise, noise detection, iterative filtering algorithm