简介：Wedevelopadatadrivenmethod(probabilitymodel)toconstructacompositeshapedescriptorbycombiningapairofscale-basedshapedescriptors.Theselectionofapairofscale-basedshapedescriptorsismodeledasthecomputationoftheunionoftwoevents,i.e.,retrievingsimilarshapesbyusingasinglescale-basedshapedescriptor.Thepairofscale-basedshapedescriptorswiththehighestprobabilityformsthecompositeshapedescriptor.Givenashapedatabase,thecompositeshapedescriptorsfortheshapesconstituteaplanarpointset.AVoR-Treeoftheplanarpointsetisthenusedasanindexingstructureforefficientqueryoperation.Experimentsandcomparisonsshowtheeffectivenessandefficiencyoftheproposedcompositeshapedescriptor.