The application of directional undecimated wavelet transform in multi-sensor image fusion

The construction of Nonsubsampled Directional Filter Bank(NSDFB) and undecimated wavelet transform which is full shift invariant are introduced,and a novel multi-sensor image fusion scheme based on NSDFB combining undecimated wavelet transform for multi sensor images is proposed.Each source image is decomposed in highpass subbands and lowpass subbands by undecimated wavelet transform,and the highpass subbands are decomposed in multi-directional high pass-bands respectively by NSDFB.Then different fusion rules are used in different subbands,and the fused image is reconstructed by taking inverse NSDFB transform and inverse undecimated wavelet transform.The experimental results show that the performance of the novel algorithm is better than the traditional fusion algorithms based on wavelet transformation and Laplacian pyramid decomposed,and especially,the novel fusion algorithm could effectively eliminate the spectrum warping and the artificial edges caused by wavelet transform.