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2015 | OriginalPaper | Buchkapitel

1. Audiovisual Quality for Interactive Communication

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Abstract

This chapter introduces the key notions related to the concept of quality and its evaluation for interactive audiovisual services like videotelephony. Focus is brought into the technological aspects associated with real-time interactive audiovisual services. A thorough description of the entire transmission chain will give a closer look at the main technical factors impacting the quality. Means of quality measurement like standardized methodologies for subjective assessment and quality estimation like instrumental methods will be reviewed. Finally, temporal as well as multi-modal aspects of audiovisual perception are presented in order to provide a broad overview on the topic.

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Fußnoten
1
Operation that consists of decoding a media stream in order to re-encode it with the appropriate codec.
 
2
The Sobel filter is used to detect edges, and more generally spatial changes of high gradient.
 
3
High Efficiency Video Coding (HEVC) codec is the successor of the H.264 standard. It improves the compression efficiency and is optimized for higher video resolutions like Ultra High Definition 4 K and 8K.
 
4
Also commonly referred as naïve test subjects or assessors whose role is to emit judgements based on their experience. They should be randomly chosen, not be involved in their work with quality or performance assessment, not have recently participated in subjective tests, and not have seen/viewed the stimuli under assessment beforehand [86].
 
5
ITU-T Rec. P.880 [92] recommends durations comprised between 45 s and 3 min.
 
6
Opticom is a firm specialized in perceptual speech, audio and video quality measurement, http://​www.​opticom.​de.
 
7
SwissQual is a firm specialized in perceptual speech and video quality assessment, contributing to the ITU in providing next generation HD testing standards for both voice and video, http://​www.​swissqual.​com.
 
Metadaten
Titel
Audiovisual Quality for Interactive Communication
verfasst von
Benjamin Belmudez
Copyright-Jahr
2015
DOI
https://doi.org/10.1007/978-3-319-14166-4_1

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