New HDR Dynamic Mapping spec to help less capable TVs cope
Adding extra life to older HDR TVs?
Industry consortium, the DVB Project have updated their Digital Video Broadcasting (DVB) specifications to allow receiving devices such as a TV sets to adapt to an incoming High Dynamic Range (HDR) signal in a way that’s more suitable to characteristics of the display.The DVB Project develops and maintains open interoperable technical standards for the delivery of audio and video in digital media and broadcast services and its latest revision includes solutions for HDR Dynamic Mapping (DM).
The adaptation in centred around one of the core specifications which determines how video and audio coding is used in satellite, cable, and terrestrial broadcasting systems, as well as in broadband delivery - the snappily titled ETSI TS 101 154.
DVB’s coding specifications include two provisions for enabling HDR content. Firstly, there is Hybrid Log-Gamma (HLG) and secondly, so called PQ-10 which is the 10 bit variant of Perceptual Quantiser (a transfer function that allows for HDR to be displayed up to a luminance of 10,000cd/m2 in the Rec. 2020 colour space). It is this second method to which the Dynamic Mapping applies.
According to DVB, there will be significant benefit in being able to 'map' the reference monitor graded HDR to lower-performance TV sets typical of the consumer environment. This functionality is achieved by inserting Dynamic Mapping Information (DMI) into the HDR video bitstream.
Essentially, the new protocol
enablescontent creators and device manufacturers with a means of adapting the video so that it is a step closer to what was intended and more closely matches what was created using reference viewing equipment in a controlled production environment.
Peter MacAvock, chair of DVB, said, “DVB has provided the industry with the specifications needed to deploy UHD services with confidence,” he further explained, “HDR Dynamic Mapping is an important element of the ecosystem, helping broadcasters and other content providers to ensure their video looks as good as it possibly can on a given display.”
Quite how effective this will be will no doubt depend on the existing capabilities of the TV or display but anything that helps the Battle of Winterfell in Game of Thrones season 8 look a little less murky has to be a good thing.
Source: www.wikipedia.com, www.tvbeurope.com, www.digitaltvnews.net
Image Source: wikipedia, videoblocks.com
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