This paper provides an overview of the rationale of the reconfigurable Media coding framework developed by MPEG standardization committee to overcome the limits of traditional ways of providing decoder specifications....
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This paper provides an overview of the rationale of the reconfigurable Media coding framework developed by MPEG standardization committee to overcome the limits of traditional ways of providing decoder specifications. Such framework is an extension of the reconfigurable Video coding framework now encompassing also 3D Graphics coding standard. The idea of this approach is to specify decoders using an actor dataflow based representation consisting of self-contained processing units (coding tools) connected altogether and communicating by explicitly exchanging data. Such representation provides a specification for which several properties of the algorithms interesting for codec implementations are explicitly exposed and can be used for exploring different implementation objectives. (C) 2013 Elsevier B.V. All rights reserved.
The long timescale between the development of new technologies for video coding and their adoption into standards results in a slow improvement in compression efficiency despite the scale of ongoing research into new ...
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The long timescale between the development of new technologies for video coding and their adoption into standards results in a slow improvement in compression efficiency despite the scale of ongoing research into new compression techniques. Standards-based codecs have limited capabilities to adapt to changes in video content, delivery environments, or platforms. There is a growing recognition, for example, with the MPEG reconfigurable Video coding initiative, that increased codec flexibility is needed. However, we anticipate that even further developments are required to address these stumbling blocks to video coder advancement. To this end, we present a new approach to video coding which enables flexible and dynamic re-configuration of video coding functions. This adaptability is achieved by sending configuration information to the decoder during a communications session as part of the compressed video signal. The decoder responds to this information by reconfiguring itself to adapt the video decoding process as prompted by the encoder. In this paper we describe a particular example of how dynamic re-configuration may be implemented in a simple video coding scenario, namely, a video coder is reconfigured dynamically by sending descriptions of new transforms during coding. We evaluate five approaches to re-configuration and show that all demonstrate rate-distortion gains over baseline coders, despite the rate increase due to sending configuration information. (C) 2010 Elsevier B.V. All rights reserved.
From the information-theoretic perspective, DNA strands serve as a storage medium for 4-ary data over the alphabet {A, T, G, C} . DNA data storage promises formidable information density, long-term durability, and eas...
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From the information-theoretic perspective, DNA strands serve as a storage medium for 4-ary data over the alphabet {A, T, G, C} . DNA data storage promises formidable information density, long-term durability, and ease of replicability. However, information in this intriguing storage technology might be corrupted because of error-prone data sequences as well as insertion, deletion, and substitution errors. Experiments have revealed that DNA sequences with long homopolymers and/or with low GC-content are notably more subject to errors upon storage. In order to address this biochemical challenge, constrained codes are proposed for usage in DNA data storage systems, and they are studied in the literature accordingly. This paper investigates the utilization of the recently-introduced method for designing lexicographically-ordered constrained (LOCO) codes in DNA data storage to improve performance. LOCO codes offer capacity-achievability, low complexity, and ease of reconfigurability. This paper introduces novel constrained codes, namely DNA LOCO (D-LOCO) codes, over the alphabet {A, T, G, C} with limited runs of identical symbols. Due to their ordered structure, these codes come with an encoding-decoding rule we derive, which provides simple and affordable encoding-decoding algorithms. In terms of storage overhead, the proposed encoding-decoding algorithms outperform those in the existing literature. Our algorithms are based on small-size adders, and therefore they are readily reconfigurable. D-LOCO codes are intrinsically balanced, which allows us to achieve balanced AT- and GC-content over the entire DNA strand with minimal rate penalty. Moreover, we propose four schemes to bridge consecutive codewords, three of which guarantee single substitution error detection per codeword. We examine the probability of undetecting errors over a presumed symmetric DNA storage channel subject to substitution errors only. We also show that D-LOCO codes are capacity-achieving and that
Recent advances in reconfigurable computing have led to new ways of implementing complex algorithms while maintaining reasonable throughput. Video codecs are becoming more complex in order to provide efficient compres...
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Recent advances in reconfigurable computing have led to new ways of implementing complex algorithms while maintaining reasonable throughput. Video codecs are becoming more complex in order to provide efficient compression for video with ever-increasing resolution. This problem is compounded by the fact that spectra of video decoding devices has become wider in the move from traditional TV to cable and satellite TV, IPTV, mobile TV, and Internet media. MPEG is tackling this problem with a reconfigurable video coding （RVC） framework and is standardizing a modular definition of tools and connections. MPEG ＇ s work started with video coding and has recently extended to graphics data coding. RVC will be supported by non-MPEG standards such as the Chinese audio-video standard （AVS）. This article gives a brief background to the reconfigurable codec framework. The key to this framework is reconfigurability and reducing granularity to find commonality between different standards.
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