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. A decoding apparatus for image decoding, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
obtain image information including residual information from a bitstream;
derive quantized transform coefficients for a current block based on the residual information;
derive transform coefficients by performing a dequantization process on the quantized transform coefficients based on scaling list data;
derive residual samples based on the transform coefficients; and
generate 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 decoding apparatus 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 decoding apparatus 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 decoding apparatus 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 decoding apparatus 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 decoding apparatus of claim 1 , wherein the header information includes a slice header or picture header related to a slice or picture.
7. The decoding apparatus 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 decoding apparatus 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 encoding apparatus for image encoding, the encoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
derive residual samples for a current block;
derive transform coefficients by performing a transform process based on the residual samples;
derive quantized transform coefficients by performing a quantization process on the transform coefficients;
generate residual information based on the quantized transform coefficients; and
encode 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 encoding apparatus 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 encoding apparatus 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 encoding apparatus 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 encoding apparatus 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 encoding apparatus of claim 9 , wherein the header information includes a slice header or picture header related to a slice or picture.
15. The encoding apparatus 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 encoding apparatus 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. An apparatus for transmitting data for an image, the apparatus comprising:
at least one processor configured to obtain 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
a transmitter configured to transmit 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.