Granted Patent B2

US 12,267,488 · App. 17/787,085 · Granted Apr 1, 2025

Inventors: Guillaume Laroche (Saint Aubin d'Aubigné, FR); Naël Ouedraogo (Val d'Anast, FR); Patrice Onno (Rennes, FR)

Assignee: Canon Kabushiki Kaisha

H04N19/107H04N19/172H04N19/174H04N19/184H04N19/46H04N19/70

Abstract

Claims (55)

1. A method of decoding a picture from a bitstream, wherein the picture comprises one or more slices, and wherein the bitstream comprises a picture header, and an adaptation parameter set, the method comprising:

decoding, from the picture header, a first syntax element which is related to partitioning and is to be used for INTRA corresponding to a coding type of a slice, if:

(a) a value of a partition constraints override flag, in the picture header, relating to partitioning is 1; and

(b) a predetermined syntax element, having a value of 0, in the picture header indicates that all slices in the picture use INTRA;

and

decoding said one or more slices using said decoded first syntax element,

wherein a second syntax element which is related to partitioning and is to be used for INTER, wherein INTER corresponds to a coding type of the slice, is capable of being decoded from the picture header depending on a value of the partition constraints override flag and a value of the predetermined syntax element,

wherein even if the value of the partition constraints override flag is 1, the second syntax element is not decoded from the picture header if the predetermined syntax element, having the value of 0, in the picture header indicates that all slices in the picture use INTRA, and

wherein the adaptation parameter set is capable of being located after the picture header in the bitstream and is capable of including information related to an adaptive loop filter.

2. The method according to claim 1 , wherein when the partitioning override flag has a value of 1, the partition constraints override flag in the picture header indicates that parameters related to partitioning are present in the picture header.

3. The method according to claim 1 , wherein a syntax element which is related to a delta QP and which is to be used for INTRA is capable of being decoded from the picture header.

4. The method according to claim 1 , wherein the bitstream further comprises a slice header, wherein information corresponding to coding type of a slice is capable of being decoded from the slice header depending on a value of the predetermined syntax element, wherein the information is not decoded from the slice header if the predetermined syntax element in a picture header indicates that all slices in the picture use INTRA.

5. A method of encoding a picture into a bitstream, wherein the picture comprises one or more slices, and

wherein the bitstream comprises a picture header, and an adaptation parameter set, the method comprising:

encoding, into the picture header, a first syntax element which is related to partitioning and is to be used for INTRA corresponding to a coding type of a slice, if:

(a) a value of a partition constraints override flag, in the picture header, relating to partitioning is 1; and

(b) a predetermined syntax element, having a value of 0, in the picture header indicates that all slices in the picture use INTRA; and

encoding said one or more slices,

wherein a second syntax element which is related to partitioning and is to be used for INTER, wherein INTER corresponds to a coding type of the slice, is capable of being encoded into the picture header depending on a value of the partition constraints override flag and a value of the predetermined syntax element,

wherein even if the value of the partition constraints override flag is 1, the second syntax element is not encoded into the picture header if the predetermined syntax element, having the value of 0, in the picture header indicates that all slices in the picture use INTRA, and

wherein the adaptation parameter set is capable of being located after the picture header in the bitstream and is capable of including information related to an adaptive loop filter.

6. A decoder adapted to decode a picture from a bitstream, wherein the picture comprises one or more slices, and wherein the bitstream comprises a picture header and an adaptation parameter set, the decoder comprising:

a decoding unit configured to:

decode, from the picture header, a first syntax element which is related to partitioning and is to be used for INTRA corresponding to a coding type of a slice, if:

(a) a value of a partition constraints override flag, in the picture header, relating to partitioning is 1; and

(b) a predetermined syntax element, having a value of 0, in the picture header indicates that all slices in the picture use INTRA; and

decode said one or more slices using said first decoded syntax element,

wherein a second syntax element which is related to partitioning and is to be used for INTER, wherein INTER corresponds to a coding type of the slice, is capable of being decoded from the picture header depending on a value of the partition constraints override flag and a value of the predetermined syntax element,

wherein even if the value of the partition constraints override flag is 1, the second syntax element is not decoded from the picture header if the predetermined syntax element, having the value of 0, in the picture header indicates that all slices in the picture use INTRA, and

wherein the adaptation parameter set is capable of being located after the picture header in the bitstream and is capable of including information related to an adaptive loop filter.

7. An encoder adapted to encode a picture into a bitstream, wherein the picture comprises one or more slices, and wherein the bitstream comprises a picture header and an adaptation parameter set, the encoder comprising:

an encoding unit configured to:

encode, into the picture header, a first syntax element which is related to partitioning and is to be used for INTRA corresponding to a coding type of a slice, if:

(a) a value of a partition constraints override flag, in the picture header, relating to partitioning is 1; and

(b) a predetermined syntax element, having a value of 0, in the picture header indicates that all slices in the picture use INTRA; and

encode said one or more slices,

wherein a second syntax element which is related to partitioning and is to be used for INTER, wherein INTER corresponds to a coding type of the slice, is capable of being encoded into the picture header depending on a value of the partition constraints override flag and a value of the predetermined syntax element,

wherein even if the value of the partition constraints override flag is 1, the second syntax element is not encoded into the picture header if the predetermined syntax element, having the value of 0, in the picture header indicates that all slices in the picture use INTRA, and

wherein the adaptation parameter set is capable of being located after the picture header in the bitstream and is capable of including information related to an adaptive loop filter.

8. A non-transitory computer readable medium storing a program for causing a computer to execute a method of decoding a picture from a bitstream, wherein the picture comprises one or more slices and wherein the bitstream comprises a picture header, and an adaptation parameter set, the method comprising:

decoding from the picture header, a first syntax element which is related to partitioning and is to be used for INTRA corresponding to a coding type of a slice, if:

(a) a value of a partition constraints override flag, in the picture header, relating to partitioning is 1; and

(b) a predetermined syntax element, having a value of 0, in the picture header indicates that all slices in the picture use INTRA; and

decoding said one or more slices using said first decoded syntax elements,

wherein a second syntax element which is related to partitioning and is to be used for INTER, wherein INTER corresponds to a coding type of the slice, is capable of being decoded from the picture header depending on a value of the partition constraints override flag and a value of the predetermined syntax element,

wherein even if the value of the partition constraints override flag is 1, the second syntax element is not decoded from the picture header if the predetermined syntax element, having the value of 0, in the picture header indicates that all slices in the picture use INTRA, and

wherein the adaptation parameter set is capable of being located after the picture header in the bitstream and is capable of including information related to an adaptive loop filter.

9. A non-transitory computer readable storage medium storing a program for causing a computer to execute a method of encoding a picture into a bitstream, wherein the picture comprises one or more slices, and wherein the bitstream comprises a picture header, and an adaptation parameter set, the method comprising:

encoding, into the picture header, a first syntax element which is related to partitioning and is to be used for INTRA corresponding to a coding type of a slice, if:

(a) a value of a partition constraints override flag, in the picture header, relating to partitioning is 1; and

(b) a predetermined syntax element, having a value of 0, in the picture header indicates that all slices in the picture use INTRA; and

encoding said one or more slices using said first syntax element,

wherein a second syntax element which is related to partitioning and is to be used for INTER, wherein INTER corresponds to a coding type of the slice, is capable of being encoded into the picture header depending on a value of the partition constraints override flag and a value of the predetermined syntax element,

wherein even if the value of the partition constraints override flag is 1, the second syntax element is not encoded into the picture header if the predetermined syntax element, having the value of 0, in the picture header indicates that all slices in the picture use INTRA, and

wherein the adaptation parameter set is capable of being located after the picture header in the bitstream and is capable of including information related to an adaptive loop filter.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (29)