基于×字形窗口的自适应中值滤波算法

传统的中值滤波方法在去除脉冲噪声的同时会损失部分图像细节,且运行速度也不能很好地满足实时性要求。在此对Matlab工具箱中的中值滤波算法进行改进,提出一种基于×字形滤波窗口的自适应中值滤波算法。该方法具有根据3×3的×字形窗口中噪声点个数自适应调整滤波窗口大小及根据矩阵的对称性及基本的逻辑运算实现×字形窗口的特点。实验结果表明,与传统的方形窗口中值滤波算法相比,该方法在有效去除椒盐噪声和脉冲噪声的同时,较好地保持了图像细节,缩短了运行时间。

Algorithm of Adaptive Median Filtering Based on X-shaped Window

Since the traditional median filtering methods may lose some image details while removing impulse noise and can not meet the demand of real-time image preprocessing,the common median filtering method in the Matlab toolbox is modified and a self-adaptive median filtering algorithm based on ×-shaped windows is proposed.This method has the following characteristics： the adaptive filtering window size is adaptively adjusted according to the number of noise points in the 3×3 X-shaped window,X-shaped window is achieved according to the symmetry of the matrix and the basic logic operations.The simulation results show that compared with the square-shaped windows,this method can maintain the image details while removing the salt and pepper noise and impulse noiseing,and can reduce the running time effectively.