Title :
Real-time 3-D head motion estimation in facial image coding
Author :
Yang, Tzong-Jer ; Wu, Fu-Che ; Ouhyoung, Ming
Author_Institution :
Dept. of Comput. Sci. & Inf. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
A simple procedure that uses only three feature points to infer 3D head motion from consecutive video frames is presented. In this procedure, a feature triangle formed using the three feature points is automatically calibrated, and an iterative method that simulates steepest descent method is applied to estimate one´s head motion. A prediction algorithm is adopted in occasional cases where the estimated result is not acceptable. This procedure has been applied to live video with an update rate of 7 frames/sec (250 frames/sec without feature extraction) on a Pentium-II 233 MHz PC, independent of cameras and users
Keywords :
face recognition; feature extraction; image coding; iterative methods; motion estimation; real-time systems; Pentium-II 233 MHz PC; consecutive video frames; facial image coding; feature extraction; feature triangle; head motion; iterative method; live video; prediction algorithm; real time 3D head motion estimation; steepest descent method; update rate; Calibration; Cameras; Computer science; Feature extraction; Head; Image coding; Iterative methods; Laboratories; Motion estimation; Multimedia communication;
Conference_Titel :
Multimedia Modeling, 1998. MMM '98. Proceedings. 1998
Conference_Location :
Lausanne
Print_ISBN :
0-8186-8911-0
DOI :
10.1109/MULMM.1998.722975
