David S. Hands

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Mean opinion score (MOS) has become a very popular indicator of perceived media quality. While there is a clear benefit to such a “reference quality indicator” and its widespread acceptance, MOS is often applied without sufficient consideration of its scope or limitations. In this paper, we critically examine MOS and the various ways it is being used today.(More)
T he Quality of Service Metrics (QoSM) Committee of the Alliance for Telecommunication Industry Standards (ATIS) Internet Protocol Television (IPTV) In teroperability Forum (IIF) is tasked with defining how objective quality metrics can provide meaningful IPTV performance measures. This group has reviewed current objective quality models as well as the(More)
Video communication over IP (Internet Protocol) networks has grown significantly in recent years. However, the Quality of Experience (QoE) associated with video over IP can vary dramatically. This is mainly due to bandwidth restrictions and the fluctuating Quality of Service (QoS). Investigating the perceptual effects of packet loss could lead to a better(More)
To predict subjective quality it is necessary to develop and validate approaches that accurately predict video quality. For perceptual quality models, developers have implemented methods that utilise information from both the original and the processed signals (full reference and reduced reference methods). For many practical applications, no reference (NR)(More)
The Video Quality Experts Group (VQEG) is preparing a large number of co-ordinated subjective multimedia quality tests. These tests will be performed by laboratories located in Europe, Asia and North America. The subjective data will be used to evaluate the performance of competing objective multimedia quality assessment algorithms. The reliability of the(More)