CPC G06T 9/40 (2013.01) | 16 Claims |
1. A three-dimensional data encoding method comprising:
determining whether a first valid node count is greater than or equal to a first threshold value predetermined, the first valid node count being a total number of valid nodes that are nodes each including a three-dimensional point, the valid nodes being included in first nodes belonging to a layer higher than a layer of a current node in an N-ary tree structure of three-dimensional points included in point cloud data, N being an integer greater than or equal to 2;
when the first valid node count is greater than or equal to the first threshold value, performing first encoding on attribute information of the current node, the first encoding including a prediction process in which second nodes are used, the second nodes including a parent node of the current node and belonging to a same layer as the parent node; and
when the first valid node count is less than the first threshold value, performing second encoding on attribute information of the current node, the second encoding not including the prediction process in which the second nodes are used.
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