简介：Differenceexpansion(DE)isoneofthefamousschemesinthefieldofreversibledatahiding.Withthehighefficiencyandsimplicity,DEalsohasreceivedmoreattentionovertheyears.DEhasagoodinformationcapacity,butduetoitsmajorlocationmap,thepurepayloadisratherlow.Thereforemanyscholarsdidrelevantimprovementswhichletnpixelsasaunitinsteadoftheoriginaltwopixelsasaunitandcanadaptivelyadjustthenumberofembeddingsecretinformationaccordingtothesmoothnessdegreeoftheblock,whichachievestheresultofimprovingtheinformationpayloadortheimagequality.Inthispaper,thestudyofDE-basedreversibledatahidingschemesiscomprehensivelydiscussed.TheperformanceofDEbasedschemesisevaluatedandcomparedintermsofembeddingcapacityandstego-imagequality.