Two-Dlmensional (2-D) signals, such as image signals, can be modeied as non-stational 2-I) raodom fileds. Adaptive filters are usefu1 in processing such non-stational signals. Recently, IIadhoud et al. extended the Least Mean Squarg (LMS) adaptive algorit,hm of Widrow [ll frem 1-D to 2-D [2] [3]. I{owever, Sn these approachs, the convergence preperties of adaptive processes on 2-D plane are restricted to one direction only. Consequently this 2-D LMS algorithm can not sufficiently exploit

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... tion of the 2-D signals. rrhis a,Igorithm also result degradations by the anisotropic processing when it proce$s imagc・ signals.