针对传统全方位多级组合滤波器在去除噪声的同时，会严重模糊图象边缘这一问题，分析了其原因，并指出为了更准确地判断出边缘细节信息，应考虑转角线条走向等特殊情况。提出了一种在去除噪声的同时，可以很好的保持图象边缘细节信息的改进的全方位多级组合滤波算法，实验结果表明，该算法在去除噪声的同时，能更好地保持图象边缘细节，取得较好的处理效果。

In many reasons of causing image quality degraded, disturb and influence of noise source are important reason of causing image quality degraded. It is necessary that removing noise for improving image quality. At the same time, It should not be damaged that the edge and detail of image to the best of our abilities. In this paper, aim at the problem that omni directional multistage combination filter fuzz the edge of image while removing noise,the reason of causing this problem is analyzed and another advanced omni directional multistage combinative algorithm is proposed. It is pointed out that should take the special cases of corner lines tread into account for solving the problem. The algorithm proposed can preserve the edge of image very well when removing noise. The result of experiment shows that this filter can preserve much more edge information of image when removing noise and achieve better effect.