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Global Motion Approximation
In order for a global motion model to best approximate camera movement, it is necessary to identify areas of the picture where motion vectors describe ...
2.
Dirac: Quantisation
Having transformed the component data, each subband's coefficients are quantised by Dirac using so-called uniform dead-zone quantisers. ...
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Dirac: Wavelet Coefficient Coding
The entropy coding used by Dirac in wavelet subband coefficient coding is based on three stages: binarisation, context modelling and adaptive arithmetic ...
4.
Dirac: Lagrangian parameter control of subband quantisation
The current Dirac encoder uses an RDO technique to pick a quantiser by minimising a Lagrangian combination of rate and distortion. ...
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Dirac Enhancements: Alterntive binarisation
The expedient of simply coding the binary representation of a multi-valued symbol is ineffective, so Dirac uses “unary” coding for binarisation of ...
6.
Overview of Dirac
Quality portable software to implement Dirac is being delivered both on the Dirac and ... The resulting codec needs to be integrated with other parts of a ...
7.
Overview of Dirac
In January 2003, BBC R&D produced a prototype video coding algorithm, ... state of the art video codecs such as H264. We have put a lot of work into Dirac. ...
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