Coding of a spatial sampling of a two-dimensional information signal using sub-division
Coding schemes for coding a spatially sampled information signal using subdivision and coding scheme for coding a sub-division or a multi tree structure are described, wherein representative embodiments relate to picture and/or video coding applications.
1. A decoder for decoding a coded signaling of a multi-tree structure, the coded signaling comprising an indication of a highest hierarchy level and a sequence of flags associated with nodes of the multi-tree structure unequal to the highest hierarchy level, each flag specifying whether the associated node is an intermediate node or child node, the decoder being configured to:
decode the indication of the highest hierarchy level from a data stream; and
sequentially decode, in a depth-first or breadth-first traversal order, the sequence of flags from the data stream with skipping nodes of the highest hierarchy level and automatically appointing same leaf nodes,
wherein:
the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture,
the tree root block is rectangular,
the decoder is configured to sequentially entropy-decode the flags using probability estimation contexts,
the probability estimation contexts are the same for flags associated with nodes of the multi-tree structure lying within the same hierarchy level of the multi-tree structure, but different for nodes of the multi-tree structure lying within different hierarchy levels of the multi-tree structure.
2. The decoder according to claim 1 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block according to which the tree root block is recursively multi-partitioned into leaf blocks, wherein each flag specifies whether an area of the tree root block corresponding to the node with which the respective flag is associated, is multi-partitioned, the decoder being configured to sequentially entropy-decode the flags.
3. The decoder according to claim 1 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture of a video which is coded into the data stream in a manner accompanied with depth information.
4. The decoder according to claim 1 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in a manner comprising an array of luma samples along with two arrays of chroma samples, wherein a scaling factor for a spatial resolution of the arrays of chroma samples relative to the array of luma samples in the horizontal direction differs from a scaling factor for a spatial resolution in the vertical direction.
5. The decoder according to claim 1 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in different color planes corresponding to different color components, and the decoder is configured to decode the different color planes of the picture independently.
6. A method for decoding a coded signaling of a multi-tree structure, the coded signaling comprising an indication of a highest hierarchy level and a sequence of flags associated with nodes of the multi-tree structure unequal to the highest hierarchy level, each flag specifying whether the associated node is an intermediate node or child node, the method comprising:
decoding the indication of the highest hierarchy level from a data stream; and
sequentially decoding, in a depth-first or breadth-first traversal order, the sequence of flags from the data stream with skipping nodes of the highest hierarchy level and automatically appointing same leaf nodes,
wherein:
the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture,
the tree root block is rectangular,
the flags are sequentially entropy-decoded using probability estimation contexts,
the probability estimation contexts are the same for flags associated with nodes of the multi-tree structure lying within the same hierarchy level of the multi-tree structure, but different for nodes of the multi-tree structure lying within different hierarchy levels of the multi-tree structure.
7. The method according to claim 6 , wherein the picture is accompanied with depth information.
8. The method according to claim 6 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in a manner comprising an array of luma samples along with two arrays of chroma samples, wherein a scaling factor for a spatial resolution of the arrays of chroma samples relative to the array of luma samples in the horizontal direction differs from a scaling factor for a spatial resolution in the vertical direction.
9. The method according to claim 6 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in different color planes corresponding to different color components, and the method comprises decoding the different color planes of the picture independently.
10. An encoder for generating a coded signaling of a multi-tree structure, the coded signaling comprising an indication of a highest hierarchy level and a sequence of flags associated with nodes of the multi-tree structure unequal to the highest hierarchy level, each flag specifying whether the associated node is an intermediate node or child node, the encoder being configured to:
encode the indication of the highest hierarchy level from a data stream; and
sequentially encode, in a depth-first or breadth-first traversal order, the sequence of flags from the data stream with skipping nodes of the highest hierarchy level and automatically appointing same leaf nodes,
wherein:
the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture,
the tree root block is rectangular,
the encoder is configured to sequentially entropy-encode the flags using probability estimation contexts,
the probability estimation contexts are the same for flags associated with nodes of the multi-tree structure lying within the same hierarchy level of the multi-tree structure, but different for nodes of the multi-tree structure lying within different hierarchy levels of the multi-tree structure.
11. The encoder according to claim 10 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture of a video which is coded into the data stream in a manner accompanied with depth information.
12. The encoder according to claim 10 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in a manner comprising an array of luma samples along with two arrays of chroma samples, wherein a scaling factor for a spatial resolution of the arrays of chroma samples relative to the array of luma samples in the horizontal direction differs from a scaling factor for a spatial resolution in the vertical direction.
13. The encoder according to claim 10 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in different color planes corresponding to different color components, and the encoder is configured to encode the different color planes of the picture independently.
14. A method for generating a coded signaling of a multi-tree structure, the coded signaling comprising an indication of a highest hierarchy level and a sequence of flags associated with nodes of the multi-tree structure unequal to the highest hierarchy level, each flag specifying whether the associated node is an intermediate node or child node, the method comprising:
encoding the indication of the highest hierarchy level from a data stream; and
sequentially encoding, in a depth-first or breadth-first traversal order, the sequence of flags from the data stream with skipping nodes of the highest hierarchy level and automatically appointing same leaf nodes,
wherein:
the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture,
the tree root block is rectangular,
the flags are sequentially entropy-encoded using probability estimation contexts,
the probability estimation contexts are the same for flags associated with nodes of the multi-tree structure lying within the same hierarchy level of the multi-tree structure, but different for nodes of the multi-tree structure lying within different hierarchy levels of the multi-tree structure.
15. The method according to claim 14 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture of a video which is coded into the data stream in a manner accompanied with depth information.
16. The method according to claim 14 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in a manner comprising an array of luma samples along with two arrays of chroma samples, wherein a scaling factor for a spatial resolution of the arrays of chroma samples relative to the array of luma samples in the horizontal direction differs from a scaling factor for a spatial resolution in the vertical direction.
17. The method according to claim 14 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in different color planes corresponding to different color components, and the method comprises encoding the different color planes of the picture independently.
18. A method for decoding a data stream, wherein the method comprises:
decoding a data stream into which a signaling of a multi-tree structure is coded, the data stream comprising:
an indication of a highest hierarchy level, and
a sequence of flags associated with nodes of the multi-tree structure unequal to the highest hierarchy level, each flag specifying whether the associated node is an intermediate node or child node,
wherein:
the sequence of flags is sequentially encoded, in a depth-first or breadth-first traversal order, into the data stream with skipping nodes of the highest hierarchy level and automatically appointing same leaf nodes,
the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture,
the tree root block is rectangular,
the flags are sequentially entropy-encoded using probability estimation contexts,
the probability estimation contexts are the same for flags associated with nodes of the multi-tree structure lying within the same hierarchy level of the multi-tree structure, but different for nodes of the multi-tree structure lying within different hierarchy levels of the multi-tree structure.
19. The method according to claim 18 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture of a video which is coded into the data stream in a manner accompanied with depth information.
20. The method according to claim 18 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in a manner comprising an array of luma samples along with two arrays of chroma samples, wherein a scaling factor for a spatial resolution of the arrays of chroma samples relative to the array of luma samples in the horizontal direction differs from a scaling factor for a spatial resolution in the vertical direction.
21. The method according to claim 18 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in different color planes corresponding to different color components, and the different color planes of the picture are decoded independently.
22. A method for decoding a data stream, wherein the method comprises:
decoding a data stream into which a signaling of a multi-tree structure is coded,
wherein the coded signaling comprises an indication of a highest hierarchy level and a sequence of flags associated with nodes of the multi-tree structure unequal to the highest hierarchy level, each flag specifying whether the associated node is an intermediate node or child node, wherein the coded signaling is generated by:
encoding the indication of the highest hierarchy level from a data stream, and
sequentially encoding, in a depth-first or breadth-first traversal order, the sequence of flags from the data stream with skipping nodes of the highest hierarchy level and automatically appointing same leaf nodes,
wherein:
the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture,
the tree root block is rectangular,
the flags are sequentially entropy-encoded using probability estimation contexts,
the probability estimation contexts are the same for flags associated with nodes of the multi-tree structure lying within the same hierarchy level of the multi-tree structure, but different for nodes of the multi-tree structure lying within different hierarchy levels of the multi-tree structure.
23. A method for transmitting information on a multi-tree structure, comprising:
transmitting, on a transmission medium, a data stream into which a signaling of the multi-tree structure is coded, the data stream comprising:
an indication of a highest hierarchy level, and
a sequence of flags associated with nodes of the multi-tree structure unequal to the highest hierarchy level, each flag specifying whether the associated node is an intermediate node or child node,
wherein:
the sequence of flags is sequentially encoded, in a depth-first or breadth-first traversal order, into the data stream with skipping nodes of the highest hierarchy level and automatically appointing same leaf nodes,
the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture,
the tree root block is rectangular,
the flags are sequentially entropy-encoded using probability estimation contexts,
the probability estimation contexts are the same for flags associated with nodes of the multi-tree structure lying within the same hierarchy level of the multi-tree structure, but different for nodes of the multi-tree structure lying within different hierarchy levels of the multi-tree structure.
24. The method according to claim 23 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture of a video which is coded into the data stream in a manner accompanied with depth information.
25. The method according to claim 23 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in a manner comprising an array of luma samples along with two arrays of chroma samples, wherein a scaling factor for a spatial resolution of the arrays of chroma samples relative to the array of luma samples in the horizontal direction differs from a scaling factor for a spatial resolution in the vertical direction.
26. The method according to claim 23 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in different color planes corresponding to different color components, and the different color planes of the picture are decoded independently.
27. A method for storing information on a multi-tree structure, comprising
storing, on a digital storage medium, a data stream into which a signaling of the multi-tree structure is coded, the data stream comprising:
an indication of a highest hierarchy level, and
a sequence of flags associated with nodes of the multi-tree structure unequal to the highest hierarchy level, each flag specifying whether the associated node is an intermediate node or child node,
wherein:
the sequence of flags is sequentially encoded, in a depth-first or breadth-first traversal order, into the data stream with skipping nodes of the highest hierarchy level and automatically appointing same leaf nodes,
the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture,
the tree root block is rectangular,
the flags are sequentially entropy-encoded using probability estimation contexts,
the probability estimation contexts are the same for flags associated with nodes of the multi-tree structure lying within the same hierarchy level of the multi-tree structure, but different for nodes of the multi-tree structure lying within different hierarchy levels of the multi-tree structure.
28. The method according to claim 27 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture of a video which is coded into the data stream in a manner accompanied with depth information.
29. The method according to claim 27 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in a manner comprising an array of luma samples along with two arrays of chroma samples, wherein a scaling factor for a spatial resolution of the arrays of chroma samples relative to the array of luma samples in the horizontal direction differs from a scaling factor for a spatial resolution in the vertical direction.
30. The method according to claim 27 , wherein the multi-tree structure prescribes a spatial multi-tree subdivision of a tree root block of a picture coded into the data stream in different color planes corresponding to different color components, and the different color planes of the picture are decoded independently.