Motion estimation. Announcements. Outline. Motion estimation
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1 Annoncemens Moion esimaion Projec # is e on ne Tesa sbmission mechanism will be annonce laer his week. graing: reor is imoran resls goo/ba iscssions on imlemenaion inerface feares ec. Digial Visal Effecs Sring 5 Yng-Y Chang 5/3/3 wih slies b Michael Black an P. Ananan Oline Moion esimaion Lcas-Kanae algorihm Tracking Oical flow Moion esimaion Parameric moion image alignmen Tracking Oical flow
2 Parameric moion Tracking Oical flow Three assmions Brighness consisenc Saial coherence Temoral ersisence
3 Brighness consisenc Saial coherence Temoral ersisence mage regisraion Goal: regiser a emlae image an an in image where = T. mage alignmen: an are wo images Tracking: is he image a ime. is a small ach aron he oin in he image a +. Oical flow: an are images of an +.
4 Simle aroach Minimize brighness ifference E Simle SSD algorihm For each offse come E; Choose which minimizes E; Problems: No efficien No sb-iel accrac Newon s meho Roo fining for f= Talor s eansion: Lcas-Kanae algorihm
5 Lcas-Kanae algorihm E E E Lcas-Kanae algorihm E E Lcas-Kanae algorihm ierae shif wih come graien image come error image - come Hessian mari sole he linear ssem =+ nil conerge Parameric moel E ; E T ; ranslaion T A ; affine
6 Parameric moel ; minimize wih resec o ; ; ; ; ; ; minimize Parameric moel ; image graien acobian of he war ware image n n acobian of he war For eamle for affine ; n n Parameric moel ; minimize ; T ; H T H T Hessian
7 Lcas-Kanae algorihm ierae war wih ; come error image - come graien image ealae acobian a ; come come Hessian come sole ae b + nil conerge T ; H ; T Coarse-o-fine sraeg Alicaion of image alignmen rami consrcion a in war w refine + a war w refine + a a rami consrcion war w refine + a a o
8 Tracking Tracking Tracking oical flow consrain eqaion brighness consanc Oical flow consrain eqaion
9 Mlile consrain Area-base meho Assme saial smoohness Aerre roblem Aerre roblem
10 Aerre roblem Demo for aerre roblem h:// eahing_objecs.hm h:// rberole.hm Aerre roblem Larger winow reces ambigi b easil iolaes saial smoohness assmion Area-base meho Assme saial smoohness E
11 Area-base meho Area-base meho The eigenales ell s abo he local image srcre. The also ell s how well we can esimae he flow in boh irecions Link o Harris corner eecor ms be inerible Tere area Ege
12 Homogenos area KLT racking Selec feare b min Monior feares b measring issimilari
13 KLT racking h:// KLT racking SFT racking maching acall Frame Frame h://
14 SFT racking SFT racking Frame Frame Frame Frame KLT s SFT racking Tracking for rooscoing KLT has larger accmlaing error; arl becase or KLT imlemenaion oesn hae affine ransformaion? SFT is srrisingl robs
15 Tracking for rooscoing aking life Single-moion assmion Oical flow Violae b Moion isconini Shaows Transarenc Seclar reflecion
16 Mlile moion Mlile moion Simle roblem: fi a line Leas-sqare fi
17 Leas-sqare fi Robs saisics Recoer he bes fi for he majori of he aa Deec an rejec oliers Aroach Robs weighing
18 Robs esimaion
19 Reglarizaion an ense oical flow
20
21
22 n for he NPR algorihm Brshes Ege cliing Graien
23 Smooh graien Tere brsh Ege cliing Temoral arifacs Frame-b-frame alicaion of he NPR algorihm
24 Temoral coherence RE:Vision ha reams ma come Reference B.D. Lcas an T. Kanae An eraie mage Regisraion Techniqe wih an Alicaion o Sereo Vision Proceeings of he 98 DARPA mage Unersaning orksho Bergen. R. an Ananan P. an Hanna K.. an Hingorani R. Hierarchical Moel-Base Moion Esimaion ECCV Shi an C. Tomasi Goo Feares o Track CVPR Michael Black an P. Ananan The Robs Esimaion of Mlile Moions: Parameric an Piecewise-Smooh Flow Fiels Comer Vision an mage Unersaning S. Baker an. Mahews Lcas-Kanae Years On: A Unifing Framework nernaional ornal of Comer Vision Peer Liwinowicz Processing mages an Vieo for An mressionis Effecs SGGRAPH 997. Aseem Agarwala Aaron Herzman Dai Salesin an Seen Seiz Keframe-Base Tracking for Rooscoing an Animaion SGGRAPH
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