New forms of video compression
Traditionally video compression technologies have been proprietary to specific manufacturers.
Looked at in isolation these usually give excellent results. But concern has been expressed that when different systems are cascaded there can be concatenation effects, visible as a degradation of picture quality. This is an issue which particularly needs consideration in a production environment, where the signal may be coded and decoded many times across the programme path.
The coding / decoding system used in Dirac and Dirac Pro by NuMedia has specifically been designed to minimise this type of effect. Indeed, in principle, the coder can be designed so there is no effect after the first generation.
This system has been developed by BBC Research & Innovation using experience built up over tens of years and uses multi-level wavelet (as opposed to convention DCT) transforms to achieve optimum overall performance.
Dirac Pro by NuMedia allows HD-SDI(3G) signals to be passed over HD-SDI(1.5G) and HD-SDI(1.5g) signals to be passed over 270Mb SDI infrastructures. Also the ability to pass two 270Mb SDI signals over one HD-SDI path.
A few of the possible applications include:
• Improved resilience Full-HD 3G SDI routing |
• Double HD-SDI routing density • Suited for use with Canon CanoBeam Optical Link (EN221/DE221) • Moving HD over existing tech infrastructure • Sending two camera channels over existing links |
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Click here for the Dirac Pro Brochure (print) (email)
Click here for the Chromatec-EN100-DE100 (print)
(email)
Click here for the Chromatec-EN221-DE221 (print) (email)
Click here for the Chromatec-EN400-DE400 (print) (email)
For further information on Dirac:
