Transformation of dynamic metadata to support alternate tone rendering

Patent metadata

Field	Value
Publication number	US-9916638-B2
Application number	US-201715584368-A
Country	US
Kind code	B2
Filing date	May 2, 2017
Priority date	Jul 20, 2016
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

An existing metadata set that is specific to a color volume transformation model is transformed to a metadata set that is specific to a distinctly different color volume transformation model. For example, source content metadata for a first color volume transformation model is received. This source metadata determines a specific color volume transformation, such as a sigmoidal tone map curve. The specific color volume transformation is mapped to a color volume transformation of a second color volume transformation model, e.g., a Bézier tone map curve. Mapping can be a best fit curve, or a reasonable approximation. Mapping results in metadata values used for the second color volume transformation model (e.g., one or more Bézier curve knee points and anchors). Thus, devices configured for the second color volume transformation model can reasonably render source content according to received source content metadata of the first color volume transformation model.

First claim

What is claimed is:

1. An apparatus to enhance reproduction of high dynamic range content, the apparatus comprising:
a means for receiving source content metadata for a first color volume transformation model;
a means for determining a first transfer curve for the first color volume transformation model based on the received source content metadata; and
a means for mapping the first transfer curve of the first color volume transformation model to a second transfer curve of a second color volume transformation model; and
wherein said mapping generates content metadata for the second color volume transformation model.

2. An apparatus to enhance reproduction of high dynamic range content, the apparatus comprising:
at least one electronic device that receives source content metadata for a first color volume transformation model;
at least one secondary electronic device that determines a first transfer curve for the first color volume transformation model based on the received source content metadata, wherein said at least one secondary electronic device is at least one of said at least one electronic device and another electronic device; and
at least one tertiary device that maps the first transfer curve of the first color volume transformation model to a second transfer curve of a second color volume transformation model, wherein said at least one tertiary device is at least one of said at least one electronic device, at least one secondary electronic device and another electronic device; and
wherein the map generates content metadata for the second color volume transformation model.

Assignees

• Dolby Laboratories Licensing Corp

Inventors

• Yeung Raymond
• Griffis Patrick
• Beier Thaddeus
• Atkins Robin

Classifications

• H04N21/235

  Processing of additional data, e.g. scrambling of additional data or processing content descriptors · CPC title

• G06T2207/20208

  High dynamic range [HDR] image processing · CPC title

• H04N21/234336

  by media transcoding, e.g. video is transformed into a slideshow of still pictures or audio is converted into text · CPC title

• G06T1/20 Primary

  Processor architectures; Processor configuration, e.g. pipelining · CPC title

• H04N1/32101

  Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title · CPC title