WASET
    Amnach Khawne and  Kazuhiko Hamamoto and  Orachat Chitsobhuk,  Ultrasonic Echo Image Adaptive Watermarking Using the Just-Noticeable Difference Estimation.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2009, vol. 36(12). 2850 - 2854
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/3515.