DPB operation-based image or video coding
AssigneeLG Electronics Inc.
InventorsSeethal Paluri, Hendry Hendry, Seunghwan Kim
Life of this patent
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Abstract
According to the disclosure of the present document, a decoded picture buffer (DPB) may be updated on the basis of DPB-related information. The DPB-related information may include a syntax element related to a maximum required size of the DPB. In updating the DPB, a bumping process may be invoked on the basis of a case where a first condition, in which the number of pictures in the DPB is neither greater than nor equal to a value obtained by adding 1 to a value of the syntax element related to the maximum required size of the DPB, is satisfied.
Claims14
An image decoding method performed by a decoding apparatus, the method comprising:
- obtaining image information including decoded picture buffer (DPB) related information from a bitstream;
- updating a DPB based on the DPB related information;
- and
- decoding a current picture based on the DPB,
- wherein the DPB related information includes a syntax element related to a maximum required size of the DPB, and
- wherein based on (i) the current picture not being a first picture of a coded video sequence start (CVSS) access unit (AU) that is different from AU 0 and (ii) a first condition in which a number of pictures in the DPB is greater than or equal to a value of the syntax element related to the maximum required size of the DPB plus 1 being satisfied, a bumping process is invoked repeatedly only until the number of pictures in the DPB is less than the value of the syntax element related to the maximum required size of the DPB plus 1, and
- wherein the AU 0 is a first AU of the bitstream.
An image encoding method, performed by an encoding apparatus, the method comprising:
- generating decoded picture buffer (DPB) related information;
- updating a DPB based on the DPB related information;
- and
- encoding image information including the DPB related information,
- wherein the DPB related information includes a syntax element related to a maximum required size of the DPB, and
- wherein based on (i) a current picture not being a first picture of a coded video sequence start (CVSS) access unit (AU) that is different from AU 0 and (ii) a first condition in which a number of pictures in the DPB is greater than or equal to a value of the syntax element related to the maximum required size of the DPB plus 1 being satisfied, a bumping process is invoked repeatedly only until the number of pictures in the DPB is less than the value of the syntax element related to the maximum required size of the DPB plus 1, and
- wherein the AU 0 is a first AU of the bitstream.
A method for transmitting data for image information comprising:
- generating decoded picture buffer (DPB) related information;
- updating a DPB based on the DPB related information;
- and
- encoding the image information including the DPB related information,
- wherein the DPB related information includes a syntax element related to a maximum required size of the DPB, and
- wherein based on (i) a current picture not being a first picture of a coded video sequence start (CVSS) access unit (AU) that is different from AU 0 and (ii) a first condition in which a number of pictures in the DPB is greater than or equal to a value of the syntax element related to the maximum required size of the DPB plus 1 being satisfied, a bumping process is invoked repeatedly only until the number of pictures in the DPB is less than the value of the syntax element related to the maximum required size of the DPB plus 1, and
- wherein the AU 0 is a first AU of the bitstream.
Dependencies are inferred from the claim text.