Planar and azimuthal mode in geometric point cloud compression

A device for decoding point cloud data, the device comprising:

• a memory to store the point cloud data;
• and
• one or more processors coupled to the memory and implemented in circuitry, the one or more processors configured to:
• determine that occupied child nodes of a node form a single plane perpendicular to a first axis of a coordinate system, wherein the first axis is a horizontal axis and the occupied child nodes contain points represented by the point cloud data;
• determine, from a plurality of contexts consisting of 8 contexts, a context for a horizontal plane position of the node, wherein the horizontal plane position indicates a position of the single plane that is perpendicular to the first axis of the coordinate system;
• and
• perform arithmetic decoding on a syntax element indicating the horizontal plane position using the determined context.

A method for encoding point cloud data, the method comprising:

• determining that occupied child nodes of a node form a single plane perpendicular to a first axis of a coordinate system, wherein the first axis is a horizontal axis and the occupied child nodes contain points represented by the point cloud data;
• determining a horizontal plane position of the node, wherein the horizontal plane position indicates a position of the single plane that is perpendicular to the first axis of the coordinate system;
• determining, from a plurality of contexts consisting of 8 contexts, a context for the horizontal plane position of the node;
• and
• performing arithmetic encoding on a syntax element indicating the horizontal plane position using the determined context.

A method for decoding point cloud data, the method comprising:

• determining that occupied child nodes of a node form a single plane perpendicular to a first axis of a coordinate system, wherein the first axis is a horizontal axis and the occupied child nodes contain points represented by the point cloud data;
• determining, from a plurality of contexts consisting of 8 contexts, a context for a horizontal plane position of the node, wherein the horizontal plane position indicates a position of the single plane that is perpendicular to the first axis of the coordinate system;
• and
• performing arithmetic decoding on a syntax element indicating the horizontal plane position using the determined context.