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  • Research Article
  • Open Access

MAP Estimation of Chin and Cheek Contours in Video Sequences

EURASIP Journal on Advances in Signal Processing20042004:817690

https://doi.org/10.1155/S111086570440208X

  • Received: 28 December 2002
  • Published:

Abstract

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 .

Keywords

  • facial feature extraction
  • model-based video coding
  • parametric 2D model
  • face contour
  • face model

Authors’ Affiliations

(1)
Ericsson Research, Ericsson Allee 1, Herzogenrath, 52134, Germany

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