MAP Estimation of Chin and Cheek Contours in Video Sequences

• Main Author: Kampmann Markus
• Format: Article
• Language: English
• Published: SpringerOpen 2004-01-01
• Series: EURASIP Journal on Advances in Signal Processing
• Subjects: facial feature extraction; model-based video coding; parametric 2D model; face contour; face model
• Online Access: http://dx.doi.org/10.1155/S111086570440208X

<p/> <p>An algorithm for the estimation of chin and cheek contours in video sequences is proposed. This algorithm exploits a priori knowledge about shape and position of chin and cheek contours in images. Exploiting knowledge about the shape, a parametric 2D model representing chin and cheek contours is introduced. Exploiting knowledge about the position, a MAP estimator is developed taking into account the observed luminance gradient as well as a priori probabilities of chin and cheek contours positions. The proposed algorithm was tested with head and shoulder video sequences (image resolution CIF). In nearly 70% of all investigated video frames, a subjectively error free estimation could be achieved. The 2D estimate error is measured as on average between 2.4 and <inline-formula><graphic file="1687-6180-2004-817690-i1.gif"/></inline-formula>.</p>