Reference picture resampling
AssigneesBeijing Bytedance Network Technology Co., Ltd., Bytedance Inc.
InventorsZhipin Deng, Li Zhang, Ye-Kui Wang, Kai Zhang
Life of this patent
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Abstract
Examples of video encoding methods and apparatus and video decoding methods and apparatus are described. An example method of video processing includes performing a conversion between a current picture of a video and a bitstream of the video according to a rule. The rule specifies that a number of entries in a reference picture list of the current picture is greater than 0 in response to (1) one or more slices in the current picture being allowed to have a slice type other than an Intra (I) slice type, and (2) reference picture list (RPL) information being present in a picture header.
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 includes a bitstream constraint which specifies that a number of entries in a reference picture list of the current picture is greater than 0 in response to (1) one or more slices in the current picture being allowed to have a slice type other than an Intra (I) slice type, and (2) reference picture list (RPL) information being present in a picture header, and
- wherein the rule further specifies that a range of a value of a first syntax element specifying a number of points in a quantization parameter (QP) table associated with a conversion of a current video block of the current picture is based on a value of a second syntax element specifying a starting luma and chroma QP used to describe the QP table, wherein the QP table is an i-th chroma QP mapping table.
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 includes a bitstream constraint which specifies that a number of entries in a reference picture list of the current picture is greater than 0 in response to (1) one or more slices in the current picture being allowed to have a slice type other than an Intra (I) slice type, and (2) reference picture list (RPL) information being present in a picture header, and
- wherein the rule further specifies that a range of a value of a first syntax element specifying a number of points in a quantization parameter (QP) table associated with a conversion of a current video block of the current picture is based on a value of a second syntax element specifying a starting luma and chroma QP used to describe the QP table, wherein the QP table is an i-th chroma QP mapping table.
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 includes a bitstream constraint which specifies that a number of entries in a reference picture list of the current picture is greater than 0 in response to (1) one or more slices in the current picture being allowed to have a slice type other than an Intra (I) slice type, and (2) reference picture list (RPL) information being present in a picture header, and
- wherein the rule further specifies that a range of a value of a first syntax element specifying a number of points in a quantization parameter (QP) table associated with a conversion of a current video block of the current picture is based on a value of a second syntax element specifying a starting luma and chroma QP used to describe the QP table, wherein the QP table is an i-th chroma QP mapping table.
A method for storing a bitstream of a video, comprising:
- generating the bitstream of the video from a current picture in the video according to a rule;
- and
- storing the bitstream in a non-transitory computer-readable recording medium,
- wherein the rule includes a bitstream constraint which specifies that a number of entries in a reference picture list of the current picture is greater than 0 in response to (1) one or more slices in the current picture being allowed to have a slice type other than an Intra (I) slice type, and (2) reference picture list (RPL) information being present in a picture header, and
- wherein the rule further specifies that a range of a value of a first syntax element specifying a number of points in a quantization parameter (QP) table associated with a conversion of a current video block of the current picture is based on a value of a second syntax element specifying a starting luma and chroma QP used to describe the QP table, wherein the QP table is an i-th chroma QP mapping table.
Dependencies are inferred from the claim text.