Sae-Tang, W., S. Liu, M. Fujiyoshi, and H. Kiya. “1D Frequency Transformation- Based Amplitude- Only Images for Copyright- and Privacy- Protection in Image Trading Systems”. ECTI Transactions on Computer and Information Technology (ECTI-CIT), vol. 8, no. 2, Apr. 2016, pp. 133-44, doi:10.37936/ecti-cit.201482.54395.