Head motion estimation from four feature points

Details Head motion estimation from four feature points Head motion estimation from four feature points

2006-04-11

2006-04-11

Ahmed, Samir (Department: 2623)

Image analysis

Applications

Motion or velocity measuring

C348S154000, C073S488000

Reexamination Certificate

active

07027618

ABSTRACT:
Linear method for performing head motion estimation from facial feature data, the method comprising the steps of: obtaining first facial image and detecting a head in the first image; detecting position of four points P of said first facial image where P={p1, p2, p3, p4}, and pk=(xk, yk); obtaining second facial image and detecting a head in the second image; detecting position of four points P′ of the second facial image where P′={p′1, p′2, p′3, p′4} and p′k=(x′k, y′k); and, determining the motion of the head represented by a rotation matrix R and translation vector T using the points P and P′.The head motion estimation is governed according to an equation:in-line-formulae description="In-line Formulae" end="lead"?P′i=RPi+T,in-line-formulae description="In-line Formulae" end="tail"?whereR=[r1Tr2Tr3T]=[rij]3×3and T=[T1T2T3]Trepresents camera rotation and translation respectively.

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