By Benjamin Belmudez
The paintings offered during this e-book makes a speciality of modeling audiovisual caliber as perceived through the clients of IP-based suggestions for video communique like videotelephony. It additionally extends the present framework for the parametric prediction of audiovisual name caliber. The e-book addresses a number of elements concerning the standard belief of complete video calls, particularly, the standard estimation of the one audio and video modalities in an interactive context, the audiovisual caliber integration of those modalities and the temporal pooling of brief sample-based caliber rankings to account for the perceptual caliber influence of time-varying degradations.
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Additional resources for Audiovisual Quality Assessment and Prediction for Videotelephony
The context effects can be reduced through a careful organization of the test plan and of the list of stimuli. For a review of the biases generally encountered in subjective listening tests (equally valid for audiovisual tests), the reader is referred to the work from Zielinski . e. no predominance of “good” conditions over “bad” ones). A pre-test is usually recommended to make the assessors aware of the type and range of impairments which consequently helps them stabilizing their internal reference and reduces the saturation effect (see Sect.
4 Temporal Pooling In the field of cognitive psychology, empirical studies have aimed at understanding how humans construct affective experiences over time. It could be shown that “global evaluations of past affective experiences are not merely perceived or felt; they are constructed” . The construction of these affective experiences over time seems to depend mostly on specific moments that can be considered as carriers of meaning. In , Fredrickson details several experiments that support the peak-end rule stating that the moments of peak affect intensity and the endings of affective periods can effectively serve as good estimators of the global retrospective evaluation of an affective episode.
They reported similar video quality ratings for both contexts but the MOS range of the audio scores was significantly reduced for the interactive situation. A possible explanation was that audio was rather judged in terms of acceptability in the interactive situation. The difference when comparing an interactive to a passive context of assessment could be the loss of discrimination (reduced MOS range) and potentially an asymmetrical assessment depending on the modality that interactants dedicate most of their shared attentional resources to.