Reference picture resampling in video processing
AssigneesBeijing Bytedance Network Technology Co., Ltd., Bytedance Inc.
InventorsKai Zhang, Li Zhang, Hongbin Liu, Jizheng Xu, Yue Wang
Life of this patent
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Abstract
A method of visual media processing, including: determining, for a current video block, a motion vector for use in a sub-block based motion vector prediction (sbTMVP) process to locate a corresponding block in a collocated picture for a conversion between the current video block and a bitstream representation of the current video block, wherein the motion vector used in the sbTMVP process is computed in accordance with a scaling operation; and performing based on using the motion vector, the conversion between the current video block and the bitstream representation of the visual media data.
Claims20
A method of processing video data, comprising:
- performing a conversion between a video picture of a video and a bitstream of the video,
- wherein the conversion is performed using sub-pictures, wherein a size of a sub-picture in the video picture is in units of a coding tree unit size associated with the video picture,
- wherein a syntax element corresponding to a width of the sub-picture or a syntax element corresponding to a height of the sub-picture is included in a sequence parameter set (SPS) syntax element associated with the video picture, and
- wherein the syntax element corresponding to the width of the sub-picture is equal to a difference between the width of the sub-picture in units of luma coding tree block size and 1, and the syntax element corresponding to the height of the sub-picture is equal to a difference between the height of the sub-picture in units of luma coding tree unit size and 1.
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 video picture of a video and a bitstream of the video,
- wherein the conversion is performed using sub-pictures, wherein a size of a sub-picture in the video picture is in units of a coding tree unit size associated with the video picture,
- wherein a syntax element corresponding to a width of the sub-picture or a syntax element corresponding to a height of the sub-picture is included in a sequence parameter set (SPS) syntax element associated with the video picture, and
- wherein the syntax element corresponding to the width of the sub-picture is equal to a difference between the width of the sub-picture in units of luma coding tree block size and 1, and the syntax element corresponding to the height of the sub-picture is equal to a difference between the height of the sub-picture in units of luma coding tree unit size and 1.
A non-transitory computer-readable storage medium storing instructions that cause a processor to:
- perform a conversion between a video picture of a video and a bitstream of the video,
- wherein the conversion is performed using sub-pictures, wherein a size of a sub-picture in the video picture is in units of a coding tree unit size associated with the video picture,
- wherein a syntax element corresponding to a width of the sub-picture or a syntax element corresponding to a height of the sub-picture is included in a sequence parameter set (SPS) syntax element associated with the video picture, and
- wherein the syntax element corresponding to the width of the sub-picture is equal to a difference between the width of the sub-picture in units of luma coding tree block size and 1, and the syntax element corresponding to the height of the sub-picture is equal to a difference between the height of the sub-picture in units of luma coding tree unit size and 1.
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 video picture of a video,
- wherein a conversion is performed using sub-pictures, wherein a size of a sub-picture in the video picture is in units of a coding tree unit size associated with the video picture,
- wherein a syntax element corresponding to a width of the sub-picture or a syntax element corresponding to a height of the sub-picture is included in a sequence parameter set (SPS) syntax element associated with the video picture, and
- wherein the syntax element corresponding to the width of the sub-picture is equal to a difference between the width of the sub-picture in units of luma coding tree block size and 1, and the syntax element corresponding to the height of the sub-picture is equal to a difference between the height of the sub-picture in units of luma coding tree unit size and 1.
Dependencies are inferred from the claim text.