báo cáo hóa học:" Research Article On the Importance of Audiovisual Coherence for the Perceived Quality of Synthesized Visual Speech"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article On the Importance of Audiovisual Coherence for the Perceived Quality of Synthesized Visual Speech | Hindawi Publishing Corporation EURASIP Journal on Audio Speech and Music Processing Volume 2009 Article ID 169819 12 pages doi 2009 169819 Research Article On the Importance of Audiovisual Coherence for the Perceived Quality of Synthesized Visual Speech Wesley Mattheyses Lukas Latacz and Werner Verhelst Department of ETRO-DSSP Vrije Universiteit Brussel Pleinlaan 2 1050 Brussels Belgium Correspondence should be addressed to Wesley Mattheyses wmatthey@ Received 27 February 2009 Revised 4 June 2009 Accepted 2 July 2009 Recommended by Gerard Bailly Audiovisual text-to-speech systems convert a written text into an audiovisual speech signal. Typically the visual mode of the synthetic speech is synthesized separately from the audio the latter being either natural or synthesized speech. However the perception of mismatches between these two information streams requires experimental exploration since it could degrade the quality of the output. In order to increase the intermodal coherence in synthetic 2D photorealistic speech we extended the well-known unit selection audio synthesis technique to work with multimodal segments containing original combinations of audio and video. Subjective experiments confirm that the audiovisual signals created by our multimodal synthesis strategy are indeed perceived as being more synchronous than those of systems in which both modes are not intrinsically coherent. Furthermore it is shown that the degree of coherence between the auditory mode and the visual mode has an influence on the perceived quality of the synthetic visual speech fragment. In addition the audio quality was found to have only a minor influence on the perceived visual signal s quality. Copyright 2009 Wesley Mattheyses et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction A

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