Zhejiang University

Sz Dji Technology Co., Ltd.

Jiafeng Chen

Lu Yu

Wenyi Wang

Xiaozhen Zheng

Pu Li

In a point cloud attribute decoding method and device, Hilbert order is used as the coding order of point cloud attributes. The nearest neighbor points in the three-dimensional space of the current point are found in several points before the current point and are used as the prediction points of the current point. In the worst case, the distance in the three-dimensional space of the two points with a distance of n on the Hilbert order is less than or equal to n, while the distance in the three-dimensional space of the two points with a distance of n on the Morton order may be greater than the maximum dimension length of the point cloud. The average distance between K points in the preceding order and the current point in Hilbert sequence is smaller than that between K points in the preceding order and the current point in Morton sequence.

Point cloud attribute encoding and decoding method and device

A data encoding method includes obtaining an attribute residual of a current point cloud point, binarizing the attribute residual to obtain a binary code of the current point cloud point that includes a first binary code indicating a first flag bit and a second binary code indicating a second flag bit, selecting a first context model from a context model list according to a first condition, selecting a second context model from the context model list according to a second condition, encoding the first binary code using the first context model, and encoding the second binary code using the second context model. The first condition and the second condition are different for the first context model and the second context model corresponding to a same index in the context model list.

Method, device, and storage medium for data encoding/decoding

A data encoding method includes determining a value of a syntax element of point cloud data of a point cloud. The point cloud data includes attribute values of the point cloud and the syntax element indicates a search range of the attribute values during prediction encoding. The method further includes performing prediction processing on the attribute values according to the search range to obtain residuals of the attribute values, and encoding the residuals and a difference between the value of the syntax element and a constant value to generate code stream data. The constant value is a positive number.

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Jiafeng Chen