Transformation of dynamic metadata to support alternate tone rendering

Patent metadata

Field	Value
Publication number	US-11010860-B2
Application number	US-201916595772-A
Country	US
Kind code	B2
Filing date	Oct 8, 2019
Priority date	Jul 20, 2016
Publication date	May 18, 2021
Grant date	May 18, 2021

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. A computer or integrated circuit implemented method of transforming dynamic metadata comprising:
receiving, by at least one computer processor or integrated circuit, source content metadata for a first color volume transformation model, the source content metadata associated with content;
determining, by the at least one computer processor or integrated circuit, a first transfer curve for the first color volume transformation model based on the received source content metadata; and
perceptually mapping, by the at least one computer processor or integrated circuit, the first transfer curve of the first color volume transformation model to a second transfer curve of a second color volume transformation model; and
rendering, by the at least one computer processor or integrated circuit, the content for the second color volume transformation model.

2. The method of claim 1 further comprising generating content metadata of the second color volume transformation model, wherein content metadata of the second color volume transformation model includes at least one knee point and an anchor for a Bézier curve.

3. The method of claim 2 , wherein the source content metadata of the first color volume transformation model includes minimum, average and maximum color component values for at least one of a picture and a delineated group of pictures.

4. The method of claim 1 further comprising generating content metadata of the second color volume transformation model, wherein content metadata of the second color volume transformation model includes minimum, average and maximum color component values for at least one of a picture and a delineated group of pictures.

5. The method of claim 4 , wherein the source content metadata of the first color volume transformation model includes at least one knee point and an anchor for a Bézier curve.

6. The method of claim 1 , wherein the mapping is performed in at least one of real-time and near real-time.

7. The method of claim 1 , wherein said mapping is performed in a networking cloud.

8. The method of claim 1 , wherein said mapping is performed off-line.

Assignees

• Dolby Laboratories Licensing Corp

Inventors

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

Classifications

• H04N5/202 Primary

  Gamma control (circuits for controlling camera response irrespective of the scene brightness H04N23/82) · CPC title

• H04N9/68 Primary

  for controlling the amplitude of colour signals, e.g. automatic chroma control circuits (H04N9/71, H04N9/73 take precedence; camera processing pipelines for controlling the colour saturation of colour signals H04N23/86) · 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

• H04N5/20

  Circuitry for controlling amplitude response · CPC title

• H04N21/235

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