Encoder, a decoder and corresponding methods
The present disclosure provides a method of decoding a coded video bitstream, the method comprising: obtaining a picture-level syntax element included in a picture header of the current picture by parsing the video bitstream, wherein the picture-level syntax element is used to specify whether an adaptive loop filter (ALF) is enabled for the current picture; in case that the picture-level syntax element specifies the adaptive loop filter is enabled for the current picture, obtaining a parameter set identifier included in the picture header, wherein the parameter set identifier is used to indicate a first parameter set comprising a set of ALF parameters, and wherein a temporal identifier of the first parameter set is less than or equal to a temporal identifier of the current picture; performing the adaptive loop filter on at least one slice of the current picture based on the first parameter set.
1. A method for decoding of a video bitstream comprising:
obtaining a picture-level syntax element included in a picture header of a current picture by parsing the video bitstream, wherein the picture-level syntax element is used to specify whether an adaptive loop filter_(ALF) is enabled for the current picture, wherein the video bitstream includes data representing the current picture;
when the picture-level syntax element specifies the adaptive loop filter is enabled for the current picture, obtaining a first parameter set identifier included in the picture header, wherein the first parameter set identifier is used to indicate a first parameter set comprising a set of ALF parameters, and wherein a temporal identifier of the first parameter set is less than or equal to a temporal identifier of the current picture; and
performing the adaptive loop filter on at least one slice of the current picture based on the first parameter set.
2. The method of claim 1 , wherein the performing the adaptive loop filter on at least one slice of the current picture based on the first parameter set comprises:
performing adaptive loop filter on a luma component of at least one slice of the current picture based on the first parameter set.
3. The method of claim 2 , wherein the method further comprises:
when the picture-level syntax element specifies the adaptive loop filter is enabled for the current picture, obtaining a second parameter set identifier included in the picture header,
wherein the second parameter set identifier is used to indicate a second parameter set comprising a set of ALF parameters, and wherein a temporal identifier of the second parameter set is less than or equal to the temporal identifier of the current picture; and
performing adaptive loop filter on a chroma component of at least one slice of the current picture based on the second parameter set.
4. A method for encoding of a video bitstream comprising:
determining whether an adaptive loop filter_(ALF) is enabled for a current picture,
wherein the video bitstream includes data representing the current picture;
encoding a picture-level syntax element into a picture header of the current picture based on the determining whether an adaptive loop filter_(ALF) is enabled for the current picture,
wherein the picture-level syntax element is used to specify whether an adaptive loop filter_(ALF) is enabled for the current picture; and
when an adaptive loop filter is enabled for the current picture, encoding a first parameter set identifier into the picture header, wherein the first parameter set identifier is used to indicate a first parameter set comprising a set of ALF parameters of an adaptive loop filter, and wherein a temporal identifier of the first parameter set is set to be less than or equal to a temporal identifier of the current picture.
5. The method of claim 4 , wherein the method further comprises: encoding the temporal identifier of the first parameter set and the temporal identifier of the current picture into the video bitstream.
6. The method of claim 4 , wherein the first parameter set comprises a set of ALF parameters of an adaptive loop filter performed on a luma component of at least one slice of the current picture.
7. The method of claim 6 , wherein the method further comprises:
when the picture-level syntax element specifies the adaptive loop filter is enabled for the current picture, encoding a second parameter set identifier into the picture header,
wherein the second parameter set identifier is used to indicate a second parameter set comprising a set of ALF parameters of an adaptive loop filter performed on a chroma component of at least one slice of the current picture, and wherein a temporal identifier of the second parameter set is set to be less than or equal to the temporal identifier of the current picture.
8. A decoder, comprising:
one or more processors; and
a non-transitory computer-readable storage medium coupled to the processors and storing programming for execution by the processors, wherein the programming, when executed by the processors, configures the decoder to:
obtain a picture-level syntax element included in a picture header of a current picture by parsing a video bitstream, wherein the picture-level syntax element is used to specify whether an adaptive loop filter_(ALF) is enabled for the current picture;
when the picture-level syntax element specifies the adaptive loop filter is enabled for the current picture, obtain a first parameter set identifier included in the picture header, wherein the first parameter set identifier is used to indicate a first parameter set comprising a set of ALF parameters, and wherein a temporal identifier of the first parameter set is less than or equal to a temporal identifier of the current picture; and
perform the adaptive loop filter on at least one slice of the current picture based on the first parameter set.
9. The decoder of claim 8 , wherein the perform the adaptive loop filter on at least one slice of the current picture based on the first parameter set comprises: perform adaptive loop filter on a luma component of at least one slice of the current picture based on the first parameter set.
10. The decoder of claim 9 , wherein the decoder further configured to:
when the picture-level syntax element specifies the adaptive loop filter is enabled for the current picture, obtain a second parameter set identifier included in the picture header,
wherein the second parameter set identifier is used to indicate a second parameter set comprising a set of ALF parameters, and wherein a temporal identifier of the second parameter set is less than or equal to the temporal identifier of the current picture; and
performing adaptive loop filter on a chroma component of at least one slice of the current picture based on the second parameter set.
11. A non-transitory storage medium which includes an encoded bitstream decoded by an image decoding device, the encoded bitstream being generated by dividing a current picture of a video signal or an image signal into a plurality blocks, and
comprising a plurality of syntax elements, wherein the plurality of syntax elements comprises a picture-level syntax element included in a picture header of the current picture by parsing a video bitstream, wherein the picture-level syntax element is used to specify whether an adaptive loop filter_(ALF) is enabled for the current picture; when the picture-level syntax element specifies the adaptive loop filter is enabled for the current picture, the encoded bitstream further comprises a first-parameter set identifier included in the picture header, wherein the first parameter set identifier is used to indicate a first parameter set comprising a set of ALF parameters, and wherein a temporal identifier of the first parameter set is set to be less than or equal to a temporal identifier of the current picture.