Grau O.,BBC Research and Development
Proceedings of the IEEE International Conference on Computer Vision | Year: 2011
Silhouette-based reconstruction techniques using multiple wide-baseline camera set-ups are popular building blocks to generate models of temporal human action. This contribution reviews visual hull computation algorithms. In particular we focus on the class of volumetric-based algorithms. We identify different processing strategies based on hierarchical, octree-based processing and suggest a new dynamic strategy that can significantly minimise the computational effort. The techniques discussed are evaluated with synthetic and real data sets. The savings demonstrated in computations on the real test sequences are in the order of a factor six on a 512512512 volumetric resolution. © 2011 IEEE.
Borer T.,BBC Research and Development
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013
Low complexity video coding addresses different applications, and is complementary to, video coding for delivery to the end user. Delivery codecs, such as the MPEG/ITU standards, provide very high compression ratios, but require high complexity and high latency. Some applications, by contrast, need the opposite characteristics of low complexity and low latency at low compression ratios. This paper discusses the applications and requirements of low complexity coding and, after discussing the prior art, describes the standard VC-2 (SMPTE 2042) codec, which is a wavelet codec designed for low complexity and ultra-low latency. VC-2 provides a wide range of coding parameters and compression ratios, allowing it to address applications such as texture coding, lossless and high dynamic range coding. In particular this paper describes the results for the low complexity coding parameters of 2 and 3 level Haar and LeGall wavelet kernels, for image regions of 4x4 and 8x8 pixels with both luma/color difference signals and RGB. The paper indicates the quality that may be achieved at various compression ratios and also clearly shows the benefit of coding luma and color components rather than RGB. © 2013 SPIE.
Noland K.C.,BBC Research and Development
IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB | Year: 2013
In this paper we design the first interlacing filter derived from scientific measurements of the human sensitivity to interlacing artefacts across the vertical-temporal video spectrum. We then test it against a range of existing linear, time-invariant interlacing filters using standard subjective test methodology. We show that although there is some overlapping of the confidence intervals, on average the optimised filter is preferred to the other filters tested. © 2013 IEEE.
Baume C.,BBC Research and Development
134th Audio Engineering Society Convention 2013 | Year: 2013
Classification of music by mood is a growing area of research with interesting applications, including navigation of large music collections. Mood classifiers are usually based on acoustic features extracted from the music, but often they are used without knowing which ones are most effective. This paper describes how 63 acoustic features were evaluated using 2389 music tracks to determine their individual usefulness in mood classification, before using feature selection algorithms to find the optimum combination.
Butler D.,BBC Research and Development
European Conference on Optical Communication, ECOC | Year: 2015
Live TV production on IP networks is challenging, with real time delivery requirements and ever increasing bit rates. SDN and NFV could allow an integrated approach, where network resources are known and guaranteed. However, there are architecture and protocol issues still to overcome. © 2015 Viajes el Corte Ingles, VECISA.