H.264-based Multiple Description Video Coder and Its DSP Implementation

Wei, Zhe; Cai, Canhui; K., K.

doi:10.1109/icip.2006.312917

Cited by 8 publications

(3 citation statements)

References 5 publications

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“…However, since there is no fundamental theoretical model to describe dark energy, there are no strong reasons to stick to such assumption. In fact, dark energy vector field candidates have been proposed [43,44,45,46,47], and these have σ = 0. Of course, if dark energy is such a vector, one might break the isotropy of a Friedmann-Robertson-Walker universe.…”

Section: Introductionmentioning

confidence: 99%

Dark energy anisotropic stress and large scale structure formation

2006

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We investigate the consequences of an imperfect dark energy fluid on the large scale structure. A phenomenological three parameter fluid description is used to study the effect of dark energy on the cosmic microwave background radiation (CMBR) and matter power spectrum. In addition to the equation of state and the sound speed, we allow a nonzero viscosity parameter for the fluid. Then anisotropic stress perturbations are generated in dark energy. In general, we find that this possibility is not excluded by the present day cosmological observations. In the simplest case when all of the three parameters are constant, we find that the observable effects of the anisotropic stress can be closely mimicked by varying the sound speed of perfect dark energy. However, now also negative values for the sound speed, as expected for adiabatic fluid model, are tolerable and in fact could explain the observed low quadrupole in the CMBR spectrum. We investigate also structure formation of imperfect fluid dark energy characterized by an evolving equation of state.In particular, we study models unifying dark energy with dark matter, such as the Chaplygin gas or the Cardassian expansion, with a shear perturbation included. This can stabilize the growth of inhomogeneities in these models, thus somewhat improving their compatibility with large scale structure observations.

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Section: Introductionmentioning

confidence: 99%

Dark energy anisotropic stress and large scale structure formation

2006

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“…Polyphase spatial sub-sampling of video frames is proposed in [25], [26]. In [27] the method is further adapted and applied to H.264 data. A prediction mechanism is devised so that two sub-frames can be predicted from the other two, so improving the redundancy allocation.…”

Section: Review Of MDC Methodsmentioning

confidence: 99%

Multiple Descriptions Based on Multirate Coding for JPEG 2000 and H.264/AVC

Tillo

Baccaglini

Olmo

2010

IEEE Trans. on Image Process.

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Multiple description coding (MDC) makes use of redundant representations of multimedia data to achieve resiliency. Descriptions should be generated so that the quality obtained when decoding a subset of them only depends on their number and not on the particular received subset. In this paper, we propose a method based on the principle of encoding the source at several rates, and properly blending the data encoded at different rates to generate the descriptions. The aim is to achieve efficient redundancy exploitation, and easy adaptation to different network scenarios by means of fine tuning of the encoder parameters. We apply this principle to both JPEG 2000 images and H.264/AVC video data. We consider as the reference scenario the distribution of contents on application-layer overlays with multiple-tree topology. The experimental results reveal that our method favorably compares with state-of-art MDC techniques.

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“…Technically this is due to the need to contract the three-form indices in order to render the interaction term covariant. This has been neglected in all previous investigations of vector-field dependent cosmological couplings [5,35,36] and in the three-form models of Ref. [37], since in those studies the interactions were not derived from a covariant Lagrangian but introduced as phenomenological terms.…”

Section: Introductionmentioning

confidence: 99%

Coupled three-form dark energy

Koivisto

Nunes

2013

Phys. Rev. D

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Cosmology with a three-form field interacting with cold dark matter is considered. In particular, the mass of the dark matter particles is assumed to depend upon the amplitude of the three-form field invariant. In comparison to coupled scalar field quintessence, the new features include an effective pressure contribution to the field equations that manifests both in the background and perturbation level. The dynamics of the background is analyzed, and new scaling solutions are found. A simple example model leading to a de Sitter expansion without a potential is studied. The Newtonian limit of cosmological perturbations is derived, and it is deduced that the coupling can be very tightly constrained by the large-scale structure data. This is demonstrated with numerical solutions for a model with nontrivial coupling and a quadratic potential.Comment: 13 pages, 6 figure

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H.264-based Multiple Description Video Coder and Its DSP Implementation

Cited by 8 publications

References 5 publications

Dark energy anisotropic stress and large scale structure formation

Dark energy anisotropic stress and large scale structure formation

Multiple Descriptions Based on Multirate Coding for JPEG 2000 and H.264/AVC

Coupled three-form dark energy

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