SCHÄTZUNG VON KOPFBEWEGUNG AUS VIER MERKMALSPUNKTEN

摘要

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 p_k=(x_k, y_k); 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: P'_i=RP_i+T, where $R=\left[\begin{array}{c}{r}_1^T\\ r_2^T\\ r_3^T\end{array}\right]={\left[r_{\mathrm{ij}}\right]}_{3x3}$ and T=[T₁ T₂ T₃]^T represents camera rotation and translation respectively.