@patent{BlaRomSchTor06, title = {Pattern detection methods and systems and face detection methods and systems}, author = {Blake, A. and Romdhani, S. and Sch{\"o}lkopf, B. and Torr, P. H. S.}, howpublished = {United States Patent, No 7099504}, month = aug, year = {2006}, note = {(expired)}, doi = {}, month_numeric = {8} }