Method and device for encoding/decoding image
A control device and video decoding technology, applied in the field of video encoding and decoding, can solve problems such as increased data volume, achieve fast encoding and decoding, optimize encoding and decoding, and achieve selective decoding.
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no. 1 approach
[0239] According to the first embodiment of the present disclosure, a video encoding device stores picture division information and information on independence of tiles constituting a picture in a PPS, stores tile id information in a tile header, and transmits the information to the video decoding device. In the first embodiment, all tiles are independent during intra prediction and entropy coding. However, during inter prediction and filtering, tiles are independent or dependent according to the independent information about the tiles stored in the PPS.
[0240] Table 14 below shows the PPS according to the first embodiment.
[0241] [Table 14]
[0242]
[0243]
[0244] According to the first embodiment, the PPS may include a flag (multiple_tiles_in_pic_flag) indicating whether one picture is divided into multiple tiles and a flag (all_independent_tile_flag) indicating whether all tiles are independent. Here, the flag (multiple_tiles_in_pic_flag) indicating whether ...
no. 2 approach
[0285] In the second embodiment of the present disclosure, as in the previous embodiments, picture division information and information on the independence of tiles constituting a picture are stored in the PPS, and only tile ID information is stored in the PPS. in the block header. In a second embodiment, a separate syntax indicating the background area is provided. That is, while the first embodiment employs a tile group ID or a tile set ID to indicate a background area, the second embodiment has a separate syntax for indicating a background area. In the second embodiment, the PPS and the tile header may vary according to whether the tile is included in the background area. In addition, the tile header may contain information on whether the tile is independent and information on tile groups and tile sets.
[0286]In the second embodiment, tiles with the same tile group id (tile_group_id) and tile set ID (tile_set_id) depend on each other during inter prediction and filterin...
no. 3 approach
[0320] In the third embodiment of the present disclosure, both the picture division information and the information on the independence of the tiles constituting the picture are stored in the tile header. According to the third embodiment, the position, size and dependency of tiles can be determined based on only tile headers without using PPS.
[0321] Table 24 below shows tile headers according to the third embodiment.
[0322] [Table 24]
[0323]
[0324] The tile header according to the third embodiment includes the syntax (tile_position) indicating the CTU id of the tile starting point (ie, upper left corner), the CTU id indicating the tile row end point (ie, upper right corner), and the CTU of the tile starting point A syntax for the difference between ids (tile_width), a flag to indicate whether the corresponding tile is dependent (independent_tile_flag), and a syntax to indicate the relationship between a tile and neighboring tiles (tile_layout_type). Here, the ti...
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