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Method for signaling virtual boundary signaling with subpictures in coded video stream

專利號(hào)
US11800096B2
公開日期
2023-10-24
申請人
TENCENT AMERICA LLC（US CA Palo Alto）
發(fā)明人
Byeongdoo Choi; Shan Liu; Stephan Wenger
IPC分類
H04N19/117; H04N19/82; H04N19/176; H04N19/132; H04N19/186
技術(shù)領(lǐng)域
picture,coded,in,video,sub,or,nal,pictures,be,syntax
地域： CA CA Palo Alto

摘要

A method, computer program, and computer system is provided for coding video data. Video data including one or more subpictures having one or more virtual boundaries is received. Information corresponding to the virtual boundaries is signaled in a picture parameter set, a picture header, or a slice header associated with the received video data. The video data is decoded based on the signaled information corresponding to the virtual boundaries.

說明書

For example, in FIG. 23, sps_num_subpics_minus2 plus 2 specifies the number of subpictures in each picture in the CLVS. The value of sps_num_subpics_minus2 may be in the range of 0 to Ceil(pic_width_max_in_luma_samples÷CtbSizeY)*Ceil(pic_height_max_in_luma_samples÷CtbSizeY)?2, inclusive. When not present, the value of sps_num_subpics_minus2 is inferred to be equal to 0.

In the same embodiment, the lists SubpicWidthInTiles[i] and SubpicHeightInTiles[i], for i ranging from 0 to sps_num_subpics_minus1, inclusive, specifying the width and the height of the i-th subpicture in tile columns and rows, respectively, and the list subpicHeightLessThanOneTileFlag[i], for i ranging from 0 to sps_num_subpics_minus1, inclusive, specifying whether the height of the i-th subpicture is less than one tile row, are derived as follows:

for(i=0; i<=sps_num_subpics_minus2+1; i++) {

leftX=subpic_ctu_top_left_x[i]

rightX=leftX+subpic_width_minus1[i]

SubpicWidthInTiles[i]=ctbToTileColIdx[rightX]+1?ctbToTileColIdx[leftX]

topY=subpic_ctu_top_left_y[i]

bottomY=topY+subpic_height_minus1[i]

SubpicHeightInTiles[i]=

ctbToTileRowIdx[bottomY]+1?ctbToTileRowIdx[topY]

if(SubpicHeightInTiles[i]==1 &&

    • subpic_height_minus1[i]+1<

RowHeight[ctbToTileRowIdx[topY]])

    權(quán)利要求

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