Principal component coding of mouth sequences

  • Authors:

  • D. Shah;S. Marshall;W. J. Welsh

  • Affiliations:

  • Dept. of EEE, University of Strathclyde, Glasgow, U.K.;Dept. of EEE, University of Strathclyde, Glasgow, U.K.;British Telecom Research Labs, Martlesham Heath, Ipswich, U.K.

  • Venue:
  • ICASSP'93 Proceedings of the 1993 IEEE international conference on Acoustics, speech, and signal processing: image and multidimensional signal processing - Volume V
  • Year:
  • 1993

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Abstract

Facial Features of a videophone image sequence are coded using the traditional technique of Principal Components (PCs). One of the main advantages of this method is that it makes use of a high apriori knowledge of the images as well as exploits the correlation between pixel values. The sequences are coded through a hybrid wire frame model in which the head and shoulder images are coded using a low number of bits. A box is placed around the mouth and eye regions whch are coded at a hgher bit rate using PCs. Since the image sequence is similar in its overall configuration, this scheme gives a very hgh compression ratio of around 500:1.