Improving COVID-19 Recognition: A Study of Contrast Enhancement Techniques and Normalization in Chest X-Rays Images. - Angel Ernesto Picazo-Castillo; Lizbeth A. Náfate Lázaro; Dennis F. Ruiz Camera; Raquel Díaz-Hernández; Leopoldo Altamirano Robles; Saúl Zapotecas Martínez; Salvador Eugenio Ayala-Raggi (CBMS, 2024)