Somkait Udomhunsakul,  Multi-Focus Image Fusion Using SFM and Wavelet Packet .   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2014, vol. 89(5). 793 - 796
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/9998287.