Rate distortion optimization for adaptive subband coding of regional adaptive haar transform (raht)
AssigneeSony Corporation
InventorsDanillo Graziosi, Arash Vosoughi
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Abstract
A method for rate distortion optimization for adaptive sub-band coding of Region-Adaptive Hierarchical Transform (RAHT) coefficients, which is a point cloud color compression method adopted in PCC test model TMC13 for compression of CAT1 sequences is described herein. Based on Lagrangian optimization, the method estimates the coefficient distortion by using the compressed mesh geometry as reference. The Lagrange factor is calculated based on the quantization parameters, and the results show that the parameters obtained automatically have similar or better performance than parameters chosen after an extensive search.
Claims21
A method programmed in a non-transitory memory of a device comprising:
- implementing geometry coding;
- performing recoloring including transferring coloring from a first point cloud to a second point cloud;
- implementing Subband Adaptive Coding (SAC)-Region-Adaptive Hierarchical Transform (RAHT) color coding to transmit a bitstream;
- and
- utilizing Rate Distortion Optimization (RDO) to determine optimal weight thresholds and dead-zones to be used for the SAC-RAHT color coding.
An apparatus comprising:
- a non-transitory memory for storing an application, the application for:
- implementing geometry coding;
- performing recoloring including transferring coloring from a first point cloud to a second point cloud;
- implementing Subband Adaptive Coding (SAC)-Region-Adaptive Hierarchical Transform (RAHT) color coding to transmit a bitstream;
- and
- utilizing Rate Distortion Optimization (RDO) to determine optimal weight thresholds and dead-zones to be used for the SAC-RAHT color coding;
- and
- a processor coupled to the memory, the processor configured for processing the application.
A system comprising:
- a coding module configured for implementing geometry coding;
- a recoloring module configured for performing recoloring including transferring coloring from a first point cloud to a second point cloud;
- a color coding module configured for implementing Subband Adaptive Coding (SAC)-Region-Adaptive Hierarchical Transform (RAHT) color coding to transmit a bitstream;
- and
- an RDO module configured for utilizing Rate Distortion Optimization (RDO) to determine optimal weight thresholds and dead-zones to be used for the SAC-RAHT color coding.
Dependencies are inferred from the claim text.