Preview: IEEE MultiMedia
IEEE MultiMedia covers technical information on a broad range of issues in multimedia systems and applications. Typical topics include hardware and software for media compression, media storage/transport, workstation support for multimedia, data modeling,
Published: Mon, 3 Nov 2014 15:35:31 GMT
PrePrint: Bi-directional Mesh-based Frame Rate Up-conversion with a Dense Motion Vector Map
In this paper, we propose a new frame rate up-conversion (FRUC) method for temporal video quality enhancement. The proposed algorithm generates an interpolated frame in between two given frames based on a bi-directional mesh interpolation (BMI), in order to cope with not only translation, but also with scale and rotation changes. BMI performance is highly influenced by the accuracy of the correspondences between the control points in the two frames. To achieve an accurate dense motion vector map (MVM) through bi-directional and uni-directional motion estimation, an initial MVM is formed by the transmitted motion vectors from coded bitstream with low computational complexity. Then, the interpolated frame is generated by frame-based BMI with the dense MVM. In our experiments, we found out that the proposed algorithm is about 2dB better than several conventional FRUC methods. Furthermore, block artifacts and blur artifacts are significantly diminished by the proposed algorithm.
PrePrint: Media contracts formalization using a standardized contract expression language
Contract Expression Languages allow representing business contracts in a digital, structured form. Some examples of XML-based languages are the Content Reference Forum format, the OASIS eContracts standard or a proposed extension for MPEG-21 Part 5 for contracts. These formats have influenced in the design of the MPEG-21 Parts 20 Contract Expression Language (CEL) and 21 Media Contract Ontology (MCO), which have been recently specified by modelling the most relevant clauses found in a large set of contracts in the audiovisual sector. The MPEG-21 CEL, described in this paper, defines a language for representing media contracts as XML. It is structured in two schemas, a core defining the structural elements of a contract, and an extension with vocabulary for specific applications. An exemplary mapping of a contract instance is discussed.