# US 12,015,764 B2 · Encoder using a flag indicating whether temporal motion vector prediction is enabled, decoder, and medium

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- Number: US 12,015,764 B2
- Document ID: US12015764B2
- Status: Granted
- Kind: B2
- Application number: 17/585,833
- Filed: 2022-01-27
- Published: 2022-05-12
- Granted: 2024-06-18
- Earliest claimed: 2019-08-27
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Takahiro Nishi; Tadamasa Toma; Kiyofumi Abe; Yusuke Kato
- Web page: https://patentgrep.com/patent/US12015764B2

## CPC

- H04N 19/105: Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N 19/172: the region being a picture, frame or field
- H04N 19/174: the region being a slice, e.g. a line of blocks or a group of blocks
- H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence)
- H04N 19/59: involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An encoder includes circuitry and memory coupled to the circuitry. In operation, the circuitry encodes, into a sequence parameter set, a first parameter indicating that a change in a picture size is allowed for any of pictures, determines whether or not a reference picture having a same size as a current picture is available to encode the current picture, and disables temporal motion vector prediction when it is determined that the reference picture having the same size as the current picture is not available.

## Claims

### Claim 1

An encoder comprising:
circuitry; and
memory coupled to the circuitry, wherein in operation, the circuitry:
encodes, into a sequence parameter set, a first parameter indicating that a change in a picture size resolution is allowed for any of pictures; and
encodes a flag indicating whether temporal motion vector prediction is enabled or disabled, wherein
when a reference picture having a same resolution as a current picture is not available to encode the current picture, the flag indicates that the temporal motion vector prediction is disabled.

### Claim 2

A decoder comprising:
circuitry; and
memory coupled to the circuitry, wherein
in operation, the circuitry:
decodes, from a sequence parameter set, a parameter indicating that a change in a picture resolution is allowed for any of pictures; and
decodes a flag indicating whether temporal motion vector prediction is enabled or disabled, wherein
when a reference picture having a same resolution as a current picture is not available to decode the current picture, the flag indicates that the temporal motion vector prediction is disabled.

### Claim 3

A non-transitory computer readable medium storing a bitstream,
the bitstream including a sequence parameter set including a parameter, the parameter indicating that a change in a picture resolution is allowed for any of pictures, the parameter being provided for a decoder to perform a decoding process, wherein
in the decoding process, a flag indicating whether temporal motion vector prediction is enabled or disabled is decoded, and
when a reference picture having a same resolution as a current picture is not available to decode the current picture, the flag indicates that the temporal motion vector prediction is disabled.