Subpicture Mapping Compression in VVC Bitstreams
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Solution Overview
Problem
In versatile video coding (VVC), the unit of subpicture mapping information is based on resolution, leading to redundant bits and a decrease in bit efficiency.
Innovation Solution
An information processing device and method that encodes a picture with multiple subpictures, generates subpicture mapping information where second subpictures have the same size as the first subpicture, and includes this information in the bitstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subpicture mapping information is stored in CTU-based units according to resolution, then the mapping can be precisely defined, but redundant bits are generated and bit efficiency decreases
Solution Approach 1:
The patent merges subpicture mapping information for multiple subpictures into a unified structure. Instead of storing separate mapping data for each subpicture in CTU-based units, the invention combines the mapping information into a more compact representation that reduces redundancy while maintaining the precision needed to define subpicture positions and sizes accurately.
2Manufacturing precision
If detailed subpicture mapping information is stored for each subpicture, then accurate picture segmentation is achieved, but the data size increases and coding efficiency decreases
Solution Approach 1:
The patent changes the parameters used to represent subpicture mapping information. Instead of using CTU-based coordinate systems for each subpicture individually, the invention transforms the representation into a more efficient parameter set that maintains segmentation accuracy while reducing the total number of bits required to encode the mapping information.
3Measurement precision
If subpicture mapping information is encoded with high detail, then subpicture positions and sizes are accurately represented, but the bitstream size increases
Solution Approach 1:
The patent extracts and removes redundant information from the subpicture mapping data. By analyzing the mapping information for multiple subpictures, the invention identifies and eliminates duplicate or unnecessary data elements, keeping only the essential information needed to accurately represent subpicture positions and sizes, thereby reducing the overall bitstream size.
Data Source
AI summary
A decrease in bit efficiency is suppressed. An information processing device includes an encoding unit (101) that encodes a picture including two or more subpictures to generate encoded data; a metadata generation unit (102) that generates subpicture mapping information including first size information of a first subpicture among the two or more subpictures and information that second size information of each of one or more second subpictures other than the first subpicture being considered the same as the first size information of the first subpicture; and a bitstream generation unit (103) that generates a bitstream including the encoded data and the subpicture mapping information.