US 12,020,461 B2
Method and apparatus for Haar-based point cloud coding
Wen Gao, West Windsor, NJ (US); Xiang Zhang, Sunnyvale, CA (US); and Shan Liu, San Jose, CA (US)
Assigned to TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed by TENCENT AMERICA LLC, Palo Alto, CA (US)
Filed on Aug. 27, 2021, as Appl. No. 17/446,263.
Claims priority of provisional application 63/159,409, filed on Mar. 10, 2021.
Prior Publication US 2022/0292730 A1, Sep. 15, 2022
Int. Cl. G06T 9/40 (2006.01); H04N 19/60 (2014.01)
CPC G06T 9/40 (2013.01) [H04N 19/60 (2014.11); G06T 2210/56 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of point cloud attribute decoding in a point cloud decoder, comprising:
determining a sorting method of a set of points of a point cloud;
determining a quantization parameter for quantizing transform coefficients of a Haar-based attribute coding of the point cloud based on first signaling information in a coded bitstream of the point cloud, the Haar-based attribute coding being configured to perform point cloud compression on the set of points of the point cloud based on a forward Haar transform matrix;
determining an entropy decoding method for decoding quantized transform coefficients according to the quantization parameter that is determined based on the first signaling information;
determining (i) the quantized transform coefficients based on the entropy decoding method and (ii) transform coefficients by applying inverse quantization based on the quantization parameter;
applying an inverse transform operation to the transform coefficients using an inverse Haar transform matrix to generate attribute residuals, the inverse Haar transform matrix associated with decoding the point cloud being equal to a product of a factor of ½ and the forward Haar transform matrix associated with encoding the point cloud; and
reconstructing attributes of the point cloud based on the determined sorting method and the generated attribute residuals.