Sae-Tang, Wannida, Shenchuan Liu, Masaaki Fujiyoshi, and Hitoshi Kiya. 2016. “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) 8 (2):133-44. https://doi.org/10.37936/ecti-cit.201482.54395.