LDB特征提取算法
libLDBisaC++libraryforextractinganultrafastanddistinctivebinaryfeatureLDB(LocalDifferenceBinary)fromanimagepatch.LDBdirectlycomputesabinarystringusingsimpleintensityandgradientdifferencetestsonpairwisegridcellswithinthepatch.Relyingonintegralimages,theaverageintensityandgradientsofe