Multifocus image fusion based on nonsubsampled contourlet transform

In recent years, image fusion has become the focus of image processing. For the fusion problems of the multifocus images with the same scence, this paper proposed a new fusion method based on nonsampled contourlet transform(NSCT). Firstly, source images are decomposed in different scales and directions by NSCT, thus the low frequency subband coefficients and the high frequency subband coefficients are obtained. Secondly, for the low frequency subband coefficients, we present a fusion rule based on the local entropy; while for the high frequency subband coefficients, a fusion rule based on the directional contrast combined with the local area energy is applied. Finally, the fused image is obtained through the inverse NSCT. Compared with the fusion method based wavelet and other fusion methods, the experiments show that this approach can achieve better results than them.