Moving image encoding and decoding
A moving image decoding method is provided for decoding encoded data of a tile group generated by splitting a picture into one or more rectangular regions. The tile group includes one or more segments. The moving image decoding method includes decoding a wavefront parallel processing (WPP) enabled flag indicating whether a rectangular tile or a coding tree unit (CTU) row having a height of one CTU exists in a segment in an object tile group; and decoding an end bit of the segment. When the WPP enabled flag is 1, after decoding a CTU at a right end of the CTU row, an end bit of a first segment having a first fixed value is decoded. When the WPP enabled flag is 0, after decoding a CTU at a bottom right of a tile, an end bit of a second segment having a second fixed value is decoded.
1. A moving image decoding method for decoding encoded data of a tile group generated by splitting a picture into one or more rectangular regions, the tile group comprising one or more segments, the moving image decoding method comprising:
decoding a wavefront parallel processing (WPP) enabled flag indicating whether a rectangular tile or a coding tree unit (CTU) row having a height of one CTU exists in a segment in an object tile group; and
decoding an end bit of the segment,
wherein:
when the WPP enabled flag is 1, after decoding a CTU at a right end of the CTU row, an end bit of a first segment having a first fixed value is decoded, and
when the WPP enabled flag is 0, after decoding a CTU at a bottom right of a tile, an end bit of a second segment having a second fixed value is decoded.
2. The moving image decoding method according to claim 1 , wherein the end bit of the first segment is equal to the end bit of the second segment.
3. The moving image decoding method according to claim 1 , wherein the end bit of the second segment and the end bit of the first segment are both equal to one.
4. A moving image encoding method for encoding data of a tile group generated by splitting a picture into one or more rectangular regions, the tile group comprising one or more segments, the moving image encoding method comprising:
encoding a wavefront parallel processing (WPP) enabled flag indicating whether a rectangular tile or a coding tree unit (CTU) row having a height of one CTU exists in a segment in an object tile group; and
encoding an end bit of the segment,
wherein when the WPP enabled flag is 1, after encoding a CTU at a right end of the CTU row, an end bit of a first segment having a first fixed value is encoded, and
when the WPP enabled flag is 0, after encoding a CTU at a bottom right of a tile, an end bit of a second segment having a second fixed value is encoded.
5. The moving image encoding method according to claim 4 , wherein the end bit of the first segment is equal to the end bit of the second segment.
6. The moving image encoding method according to claim 4 , wherein the end bit of the second segment and the end bit of the first segment are both equal to one.
7. A moving image decoding method for decoding encoded data of a tile group generated by splitting a picture into one or more rectangular regions, the tile group comprising one or more segments, the moving image decoding method comprising:
when an object tile group uses wavefront parallel processing (WPP), decoding an end bit and a byte alignment of a first segment at an end of a coding tree unit (CTU) row; and
when the object tile group does not use the WPP, decoding an end bit and a byte alignment of a second segment at an end of a tile.
8. The moving image decoding method according to claim 7 , wherein the end bit of the first segment is equal to the end bit of the second segment.
9. The moving image decoding method according to claim 7 , wherein the end bit of the second segment and the end bit of the first segment are both equal to one.