?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Automatic+Object+Segmentation+from+Calibrated+Images&rft.creator=Campbell%2C+NDF&rft.creator=Vogiatzis%2C+G&rft.creator=Hern%C3%A1ndez%2C+C&rft.creator=Cipolla%2C+R&rft.description=This+paper+addresses+the+problem+of+automatically+obtaining+the+object%2Fbackground+segmentation+of+a+rigid+3D+object+observed+in+a+set+of+images+that+have+been+calibrated+for+camera+pose+and+intrinsics.+Such+segmentations+can+be+used+to+obtain+a+shape+representation+of+a+potentially+texture-less+object+by+computing+a+visual+hull.+We+propose+an+automatic+approach+where+the+object+to+be+segmented+is+identified+by+the+pose+of+the+cameras+instead+of+user+input+such+as+2D+bounding+rectangles+or+brush-strokes.+The+key+behind+our+method+is+a+pairwise+MRF+framework+that+combines+(a)+foreground%2Fbackground+appearance+models%2C+(b)+epipolar+constraints+and+(c)+weak+stereo+correspondence+into+a+single+segmentation+cost+function+that+can+be+efficiently+solved+by+Graph-cuts.+The+segmentation+thus+obtained+is+further+improved+using+silhouette+coherency+and+then+used+to+update+the+foreground%2Fbackground+appearance+models+which+are+fed+into+the+next+Graph-cut+computation.+These+two+steps+are+iterated+until+segmentation+convergences.+Our+method+can+automatically+provide+a+3D+surface+representation+even+in+texture-less+scenes+where+MVS+methods+might+fail.+Furthermore%2C+it+confers+improved+performance+in+images+where+the+object+is+not+readily+separable+from+the+background+in+colour+space%2C+an+area+that+previous+segmentation+approaches+have+found+challenging.&rft.publisher=IEEE&rft.date=2011-11&rft.type=Proceedings+paper&rft.language=eng&rft.source=+++++In%3A++CVMP+2011%3A+The+Eighth+European+Conference+on+Visual+Media+Production.++(pp.+pp.+126-137).++IEEE%3A+USA.+(2011)+++++&rft.format=application%2Fpdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F1350009%2F1%2Fcampbell_cvmp11_auto_obj_seg.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F1350009%2F&rft.rights=open