Prepossessing of Radiological Images: Comparison of the Application of Polynomic Algorithms and Artificial Neural Networks to the Elimination of Variations in Background Luminosity. - Bernardino Arcay Varela; Amparo Alonso-Betanzos; Alfonso Castro Martínez; Concepsión Seijo García; Jesús Suarez Bustillo (IWANN (2), 1999)