Quantitative Aspects of Programming Languages and Systems (2011-12). Preface

This special issue constitutes a selection of extended contributions of original works on Pattern Recognition and Computer Vision presented at 25th SIBGRAPI - Conference on Graphics, Patterns and Images, held in 2012 in the historical city of Ouro Preto, Minas Gerais, Brazil (conference website at: www.decom.ufop.br/ sibgrapi2012). Fifteen papers were invited for this special issue and ten submissions passed through a rigorous peer-reviewing process and have been accepted for publication.