改进的中值滤波算法

Improved Median Filter Algorithm

针对中值滤波器降低图像分辨率的缺点,提出一种改进的中值滤波算法,即在中值滤波前进行边缘判断。首先判断象素是否是边缘,是则不进行变换,直接将该像素值输出。反之则进行中值滤波,将中值滤波后的值输出。实验表明,该算法对图像进行中值滤波时保存了图像的边缘细节。

Aim at the defect of median filter reducing the image＇s resolution, an improved median filter algorithm inserting edge judgment before median filter was suggested. At first, judge that the pixel is border pixel or not. If it is, no image transformation is needed and the border pixel value can be worked out directly. Otherwise, carried out the median filter, and then output the result. Experiment results show that this algorithm could preserve the image border details.