A Decision Based Unsymmetrical trimmed modified Winsorized Geometric mean is proposed for heavily corrupted images. The proposed Algorithm uses a Fixed 3x3 window for increasing noise densities. The algorithm replaces the corrupted pixel with mean of the 4 neighbours or Unsymmetrical trimmed Modified Geometric mean or mean of the window. The use of modified Winsorized Geometric mean provided a better noise elimination characteristic than many Existing algorithms. The Algorithm Exhibits very good noise eliminating capability with improved edge preservation even at very high noise densities.