[3] [3] ZHANG Zhong, BLUM R S. A Categorization of Multiscale-Decomposition-Based Image Fusion Schemes with a Performance Study for a Digital Camera Application[J]. Proceeding of the IEEE, 1999, 87(8): 1315-1326

[4] [4] BURT P J, ADELSON E. The Laplacian pyramid as a compact image code[J], IEEE Trans. Communications, 1983, 31(4): 532-540.

[5] [5] ROCKINGER O, FECHNER T. Pixel-level image fusion:The case of image sequences[J]. SPIE, 1998, 3374: 378-388.

[6] [6] DEMPSTER A P, LAIRD N M, RUBIN D B. Maximum likelihood from incomplete data via the EM algorithm[J]. J.of the Royal Statistical Soc, 1977, 39(1):1-38.