@phdthesis{oai:tsukuba.repo.nii.ac.jp:00027985, author = {Alsibai, Mohammed Hayyan}, month = {}, note = {2011, Includes bibliographical references (leaves 90-97)}, school = {筑波大学, University of Tsukuba}, title = {Detection of white arrows in blue directional signs segmented from blue sky scenes using blue-yellow opponent color filters}, year = {2012} }