# US 2020/0404336 A1 · Source Color Volume Information Messaging

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- Number: US 2020/0404336 A1
- Document ID: US20200404336A1
- Status: Published application
- Kind: A1
- Application number: 17/009,584
- Filed: 2020-09-01
- Published: 2020-12-24
- Earliest claimed: 2016-10-05
- Assignees: Dolby Laboratories Licensing Corporation
- Applicants: Dolby Laboratories Licensing Corporation
- Inventors: Tao CHEN; Peng YIN; Taoran LU; Walter J. HUSAK
- Web page: https://patentgrep.com/patent/US20200404336A1

## CPC

- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N 21/2353: {specifically adapted to content descriptors, e.g. coding, compressing or processing of metadata}
- H04N 19/14: Coding unit complexity, e.g. amount of activity or edge presence estimation (H04N19/146 takes precedence)
- H04N 19/186: the unit being a colour or a chrominance component
- H04N 19/20: using video object coding
- H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence)
- H04N 21/84: Generation or processing of descriptive data, e.g. content descriptors {(systems specially adapted for using meta-information in broadcast systems H04H60/73)}
- H04N 19/40: using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
- H04N 19/436: using parallelised computational arrangements
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Methods are described to communicate source color volume information in a coded bitstream using SEI messaging. Such data include at least the minimum, maximum, and average luminance values in the source data plus optional data that may include the color volume x and y chromaticity coordinates for the input color primaries (e.g., red, green, and blue) of the source data, and the color x and y chromaticity coordinates for the color primaries corresponding to the minimum, average, and maximum luminance values in the source data. Messaging data signaling an active region in each picture may also be included.

## Claims

### Claim 1

A method in a decoder to extract source color volume information of an input bitstream from an SEI message, the method executed on a processor, the method comprising:
receiving an SEI message comprising one or more source color SEI parameters, the one or more source color SEI parameters comprising color primary component parameters and luminance value parameters;
for a color primary component c, extracting x and y chromaticity coordinates from the color primary component parameters, wherein the x and y chromaticity coordinates define, respectively, normalized x and y chromaticity coordinates of the color primary component c of the input bitstream; and
extracting one or more of a minimum, a maximum, and an average luminance value from the luminance value parameters, wherein the minimum, the maximum, and the average luminance values are for an active region of one or more decoded pictures in the input bitstream.

### Claim 2 (depends on 1)

The method of claim 1, further comprising generating an output video signal based on the input bitstream, the x and y chromaticity coordinates for the color primary component c, and the one or more of the minimum, the maximum, and the average luminance value.

### Claim 3 (depends on 1)

The method of claim 1, wherein the x and y chromaticity coordinates are specified in increments of 0.00002, according to the CIE 1931 definition of x and y as specified in ISO 11664-1.

### Claim 4 (depends on 1)

The method of claim 1, wherein for describing color volumes that use red, green, and blue color primaries, c=0 corresponds to the green color primary, c=1 corresponds to the blue color primary, and c=2 corresponds to the red color primary.