Reference picture resampling
AssigneesBeijing Bytedance Network Technology Co., Ltd., Bytedance Inc.
InventorsYe-kui Wang, Li Zhang, Kai Zhang, Zhipin Deng
Life of this patent
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Abstract
Several techniques for video encoding and video decoding are described. One example method includes performing a conversion between a subpicture in a video picture of a video and a bitstream of the video according to a rule. The rule specifies that multiple syntax elements are used to specify usage of a reference picture resampling tool.
Claims20
A method of processing video data, comprising:
- performing a conversion between a current picture of a video and a bitstream of the video according to a rule,
- wherein the rule specifies that a first syntax element specifying whether reference picture resampling is enabled is included in a sequence parameter set of the bitstream, and a second syntax element specifying whether a spatial resolution of a picture is allowed to change within a coded layer video sequence (CLVS) referring to the sequence parameter set is conditionally included in the sequence parameter set,
- wherein the second syntax element is included in the sequence parameter set in a case that the first syntax element specifies that the reference picture resampling is enabled, and
- wherein, in a case where the second syntax element is not included in the sequence parameter set, the second syntax element is inferred to be equivalent to a value indicating that the spatial resolution of the picture is disallowed to change within the CLVS.
An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
- perform a conversion between a current picture of a video and a bitstream of the video according to a rule,
- wherein the rule specifies that a first syntax element specifying whether reference picture resampling is enabled is included in a sequence parameter set of the bitstream, and a second syntax element specifying whether a spatial resolution of a picture is allowed to change within a coded layer video sequence (CLVS) referring to the sequence parameter set is conditionally included in the sequence parameter set,
- wherein the second syntax element is included in the sequence parameter set in a case that the first syntax element specifies that the reference picture resampling is enabled, and
- wherein, in a case where the second syntax element is not included in the sequence parameter set, the second syntax element is inferred to be equivalent to a value indicating that the spatial resolution of the picture is disallowed to change within the CLVS.
A non-transitory computer-readable storage medium storing instructions that cause a processor to:
- perform a conversion between a current picture of a video and a bitstream of the video according to a rule,
- wherein the rule specifies that a first syntax element specifying whether reference picture resampling is enabled is included in a sequence parameter set of the bitstream, and a second syntax element specifying whether a spatial resolution of a picture is allowed to change within a coded layer video sequence (CLVS) referring to the sequence parameter set is conditionally included in the sequence parameter set,
- wherein the second syntax element is included in the sequence parameter set in a case that the first syntax element specifies that the reference picture resampling is enabled, and
- wherein, in a case where the second syntax element is not included in the sequence parameter set, the second syntax element is inferred to be equivalent to a value indicating that the spatial resolution of the picture is disallowed to change within the CLVS.
A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:
- generating the bitstream for a current picture of the video according to a rule,
- wherein the rule specifies that a first syntax element specifying whether reference picture resampling is enabled is included in a sequence parameter set of the bitstream, and a second syntax element specifying whether a spatial resolution of a picture is allowed to change within a coded layer video sequence (CLVS) referring to the sequence parameter set is conditionally included in the sequence parameter set,
- wherein the second syntax element is included in the sequence parameter set in a case that the first syntax element specifies that the reference picture resampling is enabled, and
- wherein, in a case where the second syntax element is not included in the sequence parameter set, the second syntax element is inferred to be equivalent to a value indicating that the spatial resolution of the picture is disallowed to change within the CLVS.
Dependencies are inferred from the claim text.