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Auditory-Visual Speech Processing 2005British Columbia, Canada |
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Auditory-Visual Speech Processing 2005British Columbia, Canada |
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Usually the design of a vector quantizer involves the minimization of a distortion measure such as the MSE. In this paper we present a new paradigm applied to the design of a visual telephony coding scheme: the synthesis of credible image sequences. In other words, the creation of smooth and coherent transitions between the images to be reproduced. This new paradigm requires the redefinition of the samples representative of each class in the Lloyd- Max algorithm. In our case the design criterion is the minimization of the maximum error within the class samples and their representative. The results obtained from the proposed method are compared to those obtained from the Lloyd-Max original algorithm.
Video transmission over asynchronous networks without real time control frequently suffers from information losses that can cause the loss of entire images. The present paper introduces a method based on the interpolation of the received images to estimate the lost images. The interpolation uses the search of credible image sequences by means of the Viterbi algorithm and a modified sequence distance.
Bibliographic reference. Bárcenas, Edson / Díaz, Mauricio / Carrillo, Rafael / Solano, Ricardo / Soto, Carolina / Valderrama, Luis / Villegas, Javier / Vizcaya, Pedro (2005): "A coding method for visual telephony sequences", In AVSP-2005, 87-92.