Detection of Masses in Digital Mammograms using K-means and Support Vector Machine - Oliveira Martins, Leonardo de (Federal University of Maranhao (Sao Luis, Brasil)) ; Braz Junior, Geraldo (Pontifical Catholic University of Rio de Janeiro) ; Corrêa Silva, Aristófanes (Pontifical Catholic University of Rio de Janeiro) ; Cardoso de Paiva, Anselmo (Pontifical Catholic University of Rio de Janeiro) ; Gattass, Marcelo (Federal University of Maranhao (Sao Luis, Brasil))