Copyright protection of multiple CT images using Octonion Krawtchouk moments and grey Wolf optimizer. - Mohamed Yamni; Achraf Daoui; Hicham Karmouni; Sarah Elmalih; Anass Ben-Fares; Mhamed Sayyouri; Hassan Qjidaa; Mustapha Maaroufi; Badreeddine Alami; Mohammed Ouazzani Jamil (J. Frankl. Inst., 2023)