Video or image coding based on signaling of scaling list data
According to the disclosure of the present document, scaling list data delivered in an adaptation parameter set (APS) may be signaled through a hierarchical structure, and the amount of data that needs to be signaled for video/image coding may be reduced and implementation may be facilitated by placing limits on the scaling list data delivered in the APS.
1. An image decoding method performed by a decoding apparatus, the method comprising:
obtaining image information including residual information from a bitstream;
deriving quantized transform coefficients for a current block based on the residual information;
deriving transform coefficients by performing a dequantization process on the quantized transform coefficients based on scaling list data;
deriving residual samples based on the transform coefficients; and
generating reconstruction samples based on the residual samples,
wherein the image information includes an adaptation parameter set (APS) and header information, and
wherein the APS includes APS ID information and APS type information, and
wherein the scaling list data is included in the APS based on the APS type information, and
wherein the header information includes APS ID information related to scaling list data, and
wherein the APS including the scaling list data is specified based on the APS ID information related to the scaling list data included in the header information.
2. The image decoding method of claim 1 ,
wherein the image information includes a sequence parameter set (SPS),
wherein the SPS includes first enabled flag information related to whether the scaling list data is used, and
wherein the scaling list data is included in the APS based on the first enabled flag information.
3. The image decoding method of claim 2 ,
wherein the image information further includes a picture parameter set (PPS), and
wherein the first enabled flag information is included in the SPS and is not included in the PPS.
4. The image decoding method of claim 2 ,
wherein the header information includes second enabled flag information related to whether the scaling list data in a picture or a slice is used, and
wherein the header information includes the second enabled flag information based on the first enabled flag information included in the SPS.
5. The image decoding method of claim 4 , wherein the header information includes the APS ID information related to the scaling list data based on the second enabled flag information.
6. The image decoding method of claim 1 , wherein the header information includes a slice header or picture header related to a slice or picture.
7. The image decoding method of claim 1 , wherein a range of values of the APS ID information is determined based on the APS type information related to indicating the APS for the scaling list data.
8. The image decoding method of claim 1 , wherein slices within one picture refer to the APS including the scaling list data in which the APS ID has an identical value.
9. An image encoding method performed by an encoding apparatus, comprising:
deriving residual samples for a current block;
deriving transform coefficients by performing a transform process based on the residual samples;
deriving quantized transform coefficients by performing a quantization process on the transform coefficients;
generating residual information based on the quantized transform coefficients; and
encoding image information including the residual information,
wherein the image information includes an adaptation parameter set (APS) and header information,
wherein the APS includes APS ID information and APS type information,
wherein scaling list data for the quantized transform coefficients is included in the APS based on the APS type information,
wherein the header information includes APS ID information related to scaling list data, and
wherein the APS including the scaling list data is specified based on the APS ID information related to the scaling list data included in the header information.
10. The image encoding method of claim 9 ,
wherein the image information includes a sequence parameter set (SPS),
wherein the SPS includes first enabled flag information related to whether the scaling list data is used, and
wherein the scaling list data is included in the APS based on the first enabled flag information.
11. The image encoding method of claim 10 ,
wherein the image information further includes a picture parameter set (PPS), and
wherein the first enabled flag information is included in the SPS and is not included in the PPS.
12. The image encoding method of claim 10 ,
wherein the header information includes second enabled flag information related to whether the scaling list data in a picture or a slice is used, and
wherein the header information includes the second enabled flag information based on the first enabled flag information included in the SPS.
13. The image encoding method of claim 12 , wherein the header information includes the APS ID information related to the scaling list data based on the second enabled flag information.
14. The image encoding method of claim 9 , wherein the header information includes a slice header or picture header related to a slice or picture.
15. The image encoding method of claim 9 , wherein a range of values of the APS ID information is determined based on the APS type information related to indicating the APS for the scaling list data.
16. The image encoding method of claim 9 , wherein slices within one picture refer to the APS including the scaling list data in which the APS ID has an identical value.
17. A non-transitory computer-readable digital storage medium storing a bitstream generated by an image encoding method, the method comprising:
deriving residual samples for a current block;
deriving transform coefficients by performing a transform process based on the residual samples;
deriving quantized transform coefficients by performing a quantization process on the transform coefficients;
generating residual information based on the quantized transform coefficients; and
encoding image information including the residual information to generate the bitstream,
wherein the image information includes an adaptation parameter set (APS) and header information,
wherein the APS includes APS ID information and APS type information,
wherein scaling list data for the quantized transform coefficients is included in the APS based on the APS type information,
wherein the header information includes APS ID information related to scaling list data, and
wherein the APS including the scaling list data is specified based on the APS ID information related to the scaling list data included in the header information.
18. A transmission method of data for an image, the method comprising:
obtaining a bitstream for the image, wherein the bitstream is generated based on deriving residual samples for a current block, deriving transform coefficients by performing a transform process based on the residual samples, deriving quantized transform coefficients by performing a quantization process on the transform coefficients, generating residual information based on the quantized transform coefficients, encoding image information including the residual information; and
transmitting the data comprising the bitstream,
wherein the image information includes an adaptation parameter set (APS) and header information,
wherein the APS includes APS ID information and APS type information,
wherein scaling list data for the quantized transform coefficients is included in the APS based on the APS type information,
wherein the header information includes APS ID information related to scaling list data, and
wherein the APS including the scaling list data is specified based on the APS ID information related to the scaling list data included in the header information.