Spectral analysis of distorted and autoencoder-reconstructed MNIST images in a kernel-induced feature space. - Rafael Castaneda-Diaz; Daniela Lopez-Betancur; Carlos Guerrero-Mendez; Efren Gonzalez-Ramirez; Flossi Puma-Ttito; V. H. Carrera-Escobedo (Int. J. Comb. Optim. Probl. Informatics, 2026)