At present

most of the traditional filters such as Goldstein

Lee

Median

Mean

and Periodic filter

can not meet the demand of noise suppression for interferograms contaminated by phase noise. Repeat filtering

however

will result in serious loss of fringe pattern. In this paper

a two-step filter is presented. The filter inherits the good edge preservation characteristics of the Contoured window fi lter and the strong smoothing capability of the Goldstein filter. In addition

it introduces the pseudo- coherence of interferogram to improve the adaptiveness of the Goldstein filter. Experimental results with both simulated and real data show that the proposed filter performs quite well both in noise reduction and in detail preservation. Moreover

it can partially recover continuous interferometric fringes from area without signals

and is applicable for interferograms with very dense and heavily curved fringes.