Preface: SIBGRAPI-T 2012

This book contains five survey papers written on the topics of the tutorials presented at the 25th SIBGRAPI - Conference on Graphics, Patterns and Images, held in Ouro Preto, Minas Gerais, Brazil from August 22-25, 2012. This is the fourth year that tutorial papers from SIBGRAPI are published by IEEE CPS. The authors of accepted tutorials are invited to write survey papers about the topics and concepts presented during the tutorial sessions. This selection includes survey papers on exciting topics in computer graphics, image processing and computer vision. We hope this material will inspire new exciting research in our fields.