Coding of RAHT Coefficients based on Coefficients of Neighboring Nodes
AssigneeComcast Cable Communications, LLC
InventorsJonathan Taquet, Sébastien Lasserre
Life of this patent
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Abstract
Systems, apparatuses, methods, and computer-readable media are described for coding RAHT coefficients based on coefficients of neighboring nodes. An encoder may use a forward RAHT transform to obtain all RAHT coefficients and may entropy encode all coefficients in the bitstream. A decoder may decode all coefficients and then backward RAHT transform the decoded coefficients to obtain attributes. A coder (e.g., encoder or decoder) may use already-coded coefficients of neighboring RAHT nodes to select a context and entropy code coefficients of a current RAHT node based on the selected context.
Claims20
A method comprising:
- determining, by a computing device, a collection of sets of region-adaptive hierarchical transform (RAHT) alternating current (AC) coefficients of previously-coded neighboring RAHT nodes of a current RAHT node for coding attributes of a point cloud associated with content;
- determining, based on the collection of sets of RAHT AC coefficients of the previously-coded neighboring RAHT nodes, an index for a set of contexts;
- selecting, based on the index, a context from the set of contexts;
- and
- coding, based on the selected context, an indication of whether a set of RAHT AC coefficients of the current RAHT node is zero.
A method comprising:
- determining, by a computing device, a collection of sets of region-adaptive hierarchical transform (RAHT) alternating current (AC) coefficients of previously-coded neighboring RAHT nodes of a current RAHT node for coding attributes of a point cloud associated with content;
- determining, based on the collection of sets of RAHT AC coefficients of the previously-coded neighboring RAHT nodes, an index for a set of contexts;
- selecting, based on the index, a context from the set of contexts;
- decoding, from a bitstream, a set of RAHT AC coefficients of the current RAHT node;
- and
- inverse RAHT transforming the decoded RAHT AC coefficients to obtain a decoded attribute of the current RAHT node.
A method comprising:
- determining, by a computing device, a collection of sets of region-adaptive hierarchical transform (RAHT) alternating current (AC) coefficients of previously-coded neighboring RAHT nodes of a current RAHT node for coding attributes of a point cloud associated with content;
- determining, based on the collection of sets of RAHT AC coefficients of the previously-coded neighboring RAHT nodes, an index for a set of contexts;
- selecting, based on the index, a context from the set of contexts;
- determining a set of RAHT AC coefficients of the current RAHT node by RAHT transforming an attribute of the current RAHT node;
- and
- encoding the set of RAHT AC coefficients into a bitstream.
Dependencies are inferred from the claim text.