The images are processed with Q shift DT CWT. The low frequency coefficients and high frequency coefficients are fused with NGMS (Neighborhood Gradient Maximum Selectivity) and SI MVMS (Synthesis Image Module Value Maximum Selectivity) separately because of their different characteristics. For the low frequency coefficients

the ones having maximal neighborhood gradient are selected. For the high frequency coefficients

the ones having maximal absolute values are selected

and verify consistency of the fused coefficients . Experience results show that the images fused by the proposed algorithm are of better quality than that produced through the algorithms with wavelet transform. The proposed algorithm not only solves the problems such as low contrast and blocking effects caused by fusion algorithms in space domain

but also avoids the artifacts and ringing artifacts exhibited by conventional wavelet based fusion algorithms

which benefit from the approximate shift invariant and good directional selectivity of Q shift DT CWT.