Method for signaling virtual boundary signaling with subpictures in coded video stream
摘要
說明書
Finally, shown is a table of possible decoding picture width and heights. Such a table can be expressed, for example, by a table indication (num_dec_pic_size_in_luma_samples_minus1) (616). The “minus1” can refer to the interpretation of the value of that syntax element. For example, if the coded value is zero, one table entry is present. If the value is five, six table entries are present. For each “l(fā)ine” in the table, decoded picture width and height are then included in the syntax (617).
The table entries presented (617) can be indexed using the syntax element dec_pic_size_idx (602) in the tile group header, thereby allowing different decoded sizes—in effect, zoom factors—per tile group.
Certain video coding technologies or standards, for example VP9, support spatial scalability by implementing certain forms of reference picture resampling (signaled quite differently from the disclosed subject matter) in conjunction with temporal scalability, so to enable spatial scalability. In particular, certain reference pictures may be upsampled using ARC-style technologies to a higher resolution to form the base of a spatial enhancement layer. Those upsampled pictures could be refined, using normal prediction mechanisms at the high resolution, so to add detail.
