Patent · US Active

Video coding using temporally coherent dynamic range mapping

US9532047B2 · kind B2 · utility

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1References

10Claims

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Assignee

Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

Jens-Uwe Garbas · Erlangen, DE
Herbert Thoma · Kenzingen, DE

Key dates

Filing date	Apr 12, 2013
Grant date	Dec 27, 2016
Priority date	—
Expiry date	Aug 21, 2035

Classification

Technology area (CPC H)Electricity
CPC primaryH04N19/98
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A more efficient co-use of dynamic range mapping on the one hand and temporal prediction on the other hand such as, for example, in order to code HDR frame sequences, is achieved by exploiting the concept of weighted prediction in order to transition from the mapping parameter from the reference frame to the currently temporally predicted frame. By this measure, the temporal prediction does not fail and despite the frame-wise variation in the dynamic range mapping, encoding efficiency is, thus, maintained. As a favorable side aspect, weighted temporal prediction is already within the capabilities of existing video coding stages such as, for example, the H.264/AVC.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.