Point Cloud Attribute Layer Signaling for Multi-Codec Decoding
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Solution Overview
Problem
Existing PCC systems face challenges in efficiently encoding and decoding point cloud data due to the inability to utilize different codecs for various attributes, improper identification of layers and streams, and lack of mechanisms for indicating layer combinations and correspondences, leading to inefficiencies in compression and decoding processes.
Innovation Solution
Implementing separate syntax elements to identify the video codec for each attribute, explicitly signaling the number of layers and layer combinations, and specifying the layer index within the PCC attribute stream, along with flags for irregular point clouds, allowing for more complex coding mechanisms that are decodable by the decoder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single video codec is used to encode all PCC attributes in a sequence, then the coding system is simple to implement, but coding efficiency is reduced because some codecs are more efficient for certain attributes than others
Solution Approach 1:
The patent segments the PCC attribute coding by introducing separate syntax elements for each attribute to identify its specific video codec. This allows different codecs to be applied to different attributes (geometry, texture, reflectance, transparency, normal) within the same sequence, optimizing coding efficiency for each attribute type while maintaining manageable system complexity through structured syntax elements.
2Productivity
If multiple video codecs are allowed for different PCC attributes, then coding efficiency increases, but the complexity of the coding system and processor resource usage increase
Solution Approach 1:
The patent applies local quality by allowing different video codecs to be selected for different PCC attributes based on their specific characteristics. Each attribute (geometry, texture, reflectance, transparency, normal) can have its own identified_codec_for_attribute syntax element, enabling locally optimized coding decisions that improve overall compression efficiency while managing system complexity through attribute-specific control.
3Reliability
If layer combinations and correspondences are not explicitly signaled, then the bitstream is more compact, but the decoder cannot properly identify and decode the layered PCC attributes
Solution Approach 1:
The patent performs preliminary action by explicitly signaling layer combinations and correspondences in the bitstream through syntax elements such as attribute_layers_combination_mode and max_attribute_layer_idx. This pre-provides the decoder with necessary information about how PCC attributes are organized into layers and how they combine, ensuring reliable decoding while managing bitstream size through targeted signaling rather than exhaustive data transmission.
Data Source
AI summary
A video coding mechanism is disclosed. The mechanism includes receiving a bitstream comprising a plurality of coded sequences of point cloud coding (PCC) frames. The plurality of coded sequences of PCC frames represent a plurality of PCC attributes including geometry, texture, and one or more of reflectance, transparency, and normal. Each coded PCC frame is represented by one or more PCC network abstraction layer (NAL) units.The mechanism also includes parsing the bitstream to obtain, for each PCC attribute, an indication of one of a plurality of video codecs used to code the corresponding PCC attribute. The mechanism also includes decoding the bitstream based on the indicated video codecs for the PCC attributes.