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

專利號(hào)
US11800096B2
公開(kāi)日期
2023-10-24
申請(qǐng)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(shuō)明書

The width and height information of each subpicture may be signaled in SPS in units of CtbSizeY. In FIG. 23, for example, subpic_width_minus1[i] plus 1 specifies the width of the i-th subpicture in units of CtbSizeY. The length of the syntax element is Ceil(Log 2((pic_width_max_in_luma_samples+CtbSizeY?1)>>CtbLog2SizeY))bits. When not present, the value of subpic_width_minus1[i] is inferred to be equal to ((pic_width_max_in_luma_samples+CtbSizeY?1)>>CtbLog2SizeY)?subpic_ctu_top_lef t_x[i]?1. subpic_height_minus1[i] plus 1 specifies the height of the i-th subpicture in units of CtbSizeY. The length of the syntax element is Ceil(Log 2((pic_height_max_in_luma_samples+CtbSizeY?1)>>CtbLog2SizeY))bits. When not present, the value of subpic_height_minus1[i] is inferred to be equal to ((pic_height_max_in_luma_samples+CtbSizeY?1)>>CtbLog2SizeY)?subpic_ctu_top_left_y[i]?1.

The width of each subpicture may be greater than or equal to CtbSizeY, when the picture width is greater than or equal to CtbSizeY. The height of each subpicture may be greater than or equal to CtbSizeY, when the picture height is greater than or equal to CtbSizeY.

If the picture width is not greater than CtbSizeY and the picture height is not greater than CtbSizeY, the picture may not be partitioned into more than one subpicture. In the case, the number of subpictures may be equal to 1.

When pic_width_max_in_luma_samples is not greater than CtbSizeY and pic_height_max_in_luma_samples is not greater than CtbSizeY, the value of subpic_info_present_flag shall be equal to 0. When subpic_info_present_flag is equal to 0, no explicit signaling is present for subpicture partitioning information and the number of subpicture in the picture is equal to 1.

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