3Nieminen A et al. A new class of detail-preserving filters for image processing. IEEE Transon PAMI,1987,9(1).
4Arce G R and Foster R E. Detail-preserving rankedorder based filter for image processing. IEEE Transon ASSP,1987,37(1).
5Li et al. Relationship of the multi-shell to multistage and standard median filters. IEEE Trans on Image Processing, 19 9 5,4 ( 8 ).
6Sun Tong et al. Image restoration by multistage adaptive center weighted median filters. Proceedings of SPIE-The International Society for Optical Engi-neering , 1994,2180.
7vWang Xin. Adaptive multistage median filter. IEEE Trans on Signal Processing, 1992,40(4).