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1 Vol. 1 No (July 2008) Person-independent Monocular Tracking of Face and Facial Actions Yusuke Sugano 1 and Yoichi Sato 1 This paper presents a monocular method of tracking faces and facial actions using a multilinear face model that treats interpersonal and intrapersonal shape variations separately. We created this method by integrating two different frameworks: particle filter-based tracking for time-dependent facial action and pose estimation and incremental bundle adjustment for person-dependent shape estimation. This combination together with multilinear face models is the key to tracking faces and facial actions of arbitrary people in real time with no pre-learned individual face models. Experiments using real video sequences demonstrate the effectiveness of our method. 1 Institute of Industrial Science, The University of Tokyo 1. 3 HCI ITS 3 5),8),9),17),18) 5),8),9),17) 1 3 Bregler 1) Tomasi-Kanade ) 3 6),16) 2 AAM Active Appearance Model Gross 6) 41 c 2008 Information Processing Society of Japan
2 Zhu 16) Dornaika 4) 3D Vlasic 13) DeCarlo 2) Fig. 1 System overview. 3 1 Estimation step Modeling step 2 3 2
3 K 3 M R 3K T K = M N-mode SVD Singular Value Decomposition Vasilescu 11),12) N-mode SVD Vasilescu 3 T R 3K S A Feature points M Action Shape Shape A Action S N-mode SVD T T = C feature U feature shape U shape action U action (1) = M shape U shape action U action (2) i i i (2) SVD 3 2 Fig. 2 Example of facial deformation. 3 Fig. 3 Data tensor. U i i C R 3K S A SVD U feature C M T M shape Ǔ shape action Ǔ action (3) M
4 ) S K A =10 S A M T (3) A A S S s R S a R A M M M = M + M shape s T action a T (4) (3) Ǔ shape =(š 1,...,š S ) T Ǔ action =(ǎ 1,...,ǎ A ) T S A š 1 š S s σ s ǎ 1 ǎ A ā σ a s a p ) 10) 3) 4 Fig. 4 Flow of incremental bundle adjustment i 6 p i a i s a i s (4) M i m i = P(p i, M i (a i, s)) (5) P M i p i M i m i K 2 2K i 2 ˆm i 4 F t = ˆm i m i (p i, a i, s) 2 (6) i f t f t 4 t n (6) f t
5 t f t 4 t p t a t Zhang 15) n 3.2 (6) C pi C ai C s LM Levenberg-Marquardt 7) min F t, p i C pi, a i C ai, s C s (7) {p i },{a i },s ˆp C pi = {p i ˆp i λ p p i ˆp i + λ p } (8) λ p C ai 2 C s = {s s 2σ s s s +2σ s } (9) 95% s s (t) s (t) = t 1 s (t 1) + 1 t t s (10) Pose estimation step Feature-point recalculation step 4.1 p t a t s (10) s (t 1) (4) a t M t = M + M t a t (M t = M shape s T (t 1)) (11) (6 + A ) x t =(p T t, a T t ) T {(u (i) t ; π (i) t )}(i =1...N) (6 + A ) N u (i) t π (i) t t 1 {(u (i) t 1 ; π(i) t 1 )}
6 46 3 N u (i) t = u t 1 + τv t 1 + ω (12) u t 1 {(u (i) t 1 ; π(i) t 1 )} τ v t 1 t 1 x a t v t 1 a t 0 ω 0 18) κσ a κ 0.2 u (i) t π (i) t ( ( ) 2 K N(u (i) ) ( t ) A π (i) t exp 2σ 2 exp 1 2 b=1 ( ) a (i) t,b ā 2 ) b ς b N (u (i) t ) T K K K 1 σ a (i) t a (i) t,b ā b ς b a (i) t ā σ a b 1 π (i) t {(u (i) t ; π (i) t )} x t x 0 OKAO K n (6) 5 (13) 5 Fig. 5 Finding true feature points. ā s m t 2 ˆm t (6) Gokturk 5) E t E t d ˆm ˆm t } E t = {ρ Î t Î t Î t Î ɛ ˆm t m t 2 (14) ROI 1 Î t R K ˆm t Î t k ˆm t k 2 ρ m t x t (5) 2 m t ˆm t ɛ )
7 Table 1 Comparison of estimation errors. [mm] x y z [deg.] roll pitch yaw Particle filter-based estimation using the generic PCA model Mean Mean Std. Dev Std. Dev Our method using the multilinear model Mean Mean Std. Dev Std. Dev PCA Intel Core 2 Duo E6700 PC GB OS Windows XP 2 IEEE T n =7 LM [ms] 32 [ms/frame] Fig. 6 Result images: the right column shows actual estimation results of our method using the multilinear model, and the center column shows results of the generic model-based method. The left column shows these results rendered from a different viewpoint. PCA 16)
8 Fig. 7 x y z roll z yaw y pitch x Estimation results: x, y, andz are the horizontal, vertical, and depth-directional translation, and roll, pitch, andyaw are the rotation around the z, y, andx axes, respectively. The bottom graph shows the facial shape estimation error in the model coordinate system. 1) Bregler, C., Hertzmann, A. and Biermann, H.: Recovering non-rigid 3d shape from image streams, Proc. IEEE Int. Conf. Computer Vision and Pattern Recognition, Vol.2, pp (2000). 2)DeCarlo,D.and Metaxas,D.:Adjusting Shape Parameters using Model-based Optical Flow Residuals, IEEE Trans. Pattern Analysis and Machine Intelligence, Vol.24, No.6, pp (2002). 3) Del Bue, A., Smeraldi, F., Agapito, L. and Mary, Q.: Non-rigid structure from motion using non-parametric tracking and non-linear optimization, Proc. IEEE Workshop on Articulated and Non-Rigid Motion, Vol.1 (2004). 4) Dornaika, F. and Davoine, F.: On appearance based face and facial action tracking, IEEE Trans. Circuits and Systems for Video Technology, Vol.16, No.9, pp (2006). 5) Gokturk, S.B., Bouguet, J.Y. and Grzeszczuk, R.: A data-driven model for monocular face tracking, Proc. IEEE Int. Conf. Computer Vision, Vol.2, pp (2001). 6) Gross, R., Matthews, I. and Baker, S.: Generic vs. person specific active appearance models, Image and Vision Computing, Vol.23, No.11, pp (2005).
9 49 3 7) Lourakis, M.I.A.: levmar: Levenberg-Marquardt nonlinear least squares algorithms in C/C++ (2004). lourakis/levmar/ 8) Matthews, I. and Baker, S.: Active appearance models revisited, Int. J. Computer Vision, Vol.60, No.2, pp (2004). 9) Munoz, E., Buenaposada, J.M. and Baumela, L.: Efficient model-based 3D tracking of deformable objects, Proc. IEEE Int. Conf. Computer Vision, pp (2005). 10) Vacchetti, L., Lepetit, V. and Fua, P.: Stable real-time 3D tracking using online and offline information, IEEE Trans. Pattern Analysis and Machine Intelligence, Vol.26, No.10, pp (2004). 11) Vasilescu, M.A.O. and Terzopoulos, D.: Multilinear analysis of image ensembles: Tensorfaces, Proc. European Conf. on Computer Vision, pp (2002). 12) Vasilescu, M.A.O. and Terzopoulos, D.: Multilinear image analysis for facial recognition, Proc. Int. Conf. Pattern Recognition (ICPR 02 ), Vol.2, pp (2002). 13) Vlasic, D., Brand, M., Pfister, H. and Popovic, J.: Face transfer with multilinear models, ACM Trans. Graphics (Proc. ACM SIGGRAPH 2005 ), Vol.24, No.3, pp (2005). 14) Xin, L., Wang, Q., Tao, J., Tang, X., Tan, T. and Shum, H.: Automatic 3D face modeling from video, Proc. IEEE Int. Conf. Computer Vision, Vol.2, pp (2005). 15) Zhang, Z. and Shan, Y.: Incremental motion estimation through modified bundle adjustment, Proc. IEEE Int. Conf. Image Processing, Vol.2, pp (2003). 16) Zhu, J., Hoi, S.C.H. and Lyu, M.R.: Real-time non-rigid shape recovery via active appearance models for augmented reality, Proc. 9th European Conf. Computer Vision, pp (2006). 17) Zhu, Z. and Ji, Q.: Robust Real-Time Face Pose and Facial Expression Recovery, Proc. IEEE Int. Conf. Computer Vision and Pattern Recognition, pp (2006). 18) Vol.47, No.SIG10 (CVIM15), pp (2006). ( ) ( ) Ph.D. in Robotics ACM IEEE
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