It is a watermarking algorithm using changing value of DCT 2D coefficients.
Piotr Lenarczyk (2020). Trivial Watermarking in DCT 2D Domain (https://www.mathworks.com/matlabcentral/fileexchange/55069-trivial-watermarking-in-dct-2d-domain), MATLAB Central File Exchange. Retrieved .
If one want to use this script with opensource recommended program OCTAVE, he or she must comment a clearvars; command and load two packages ( must be installed ##sudo apt-get install octave-image octave-signal## ), at beginning of script:
pkg load image; pkg load signal;
Modified licence: Algorithm code is provided "as is", without guarantee and copyrights for this script. If you have a while please cite.