Real Time Facial Expression Recognition System Using 2D-DCT and. International Journal of Current Engineering and Technology, [S. l.], v. 1, n. 1.Special Issue, p. 280–287, 2013. Disponível em: https://ijcet.evegenis.org/index.php/ijcet/article/view/3845. Acesso em: 26 apr. 2026.