If you use the code, please cite the following paper:
@Article{zhan2015multifocus,
author = {Zhan, Kun and Li, Qiaoqiao and Teng, Jicai and Wang, Mingying and Shi, Jinhui},
title = {Multifocus image fusion using phase congruency},
journal = {Journal of Electronic Imaging},
year = {2015},
volume = {24},
number = {3},
pages = {033014},
publisher = {International Society for Optics and Photonics}
}