Video Picture Partitioning via PPS Flags
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Solution Overview
Problem
Current video coding standards face limitations in efficiently partitioning pictures into tiles or slices, which affects coding performance and compression efficiency, particularly in advanced standards like HEVC and VVC.
Innovation Solution
The method involves determining whether a picture can be partitioned into tiles or slices through specific flags in picture parameter sets (PPS), allowing for flexible encoding and decoding modes such as raster-scan or rectangular slice modes, and modifying SPS and PPS syntax elements to remove unnecessary constraints, thereby improving coding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pictures are partitioned into tiles or slices using traditional video coding standards, then coding efficiency is improved, but device complexity and processing overhead increase
Solution Approach 1:
The picture is divided into multiple tiles or slices, allowing parallel processing and improved coding efficiency. Each tile/slice can be encoded and decoded independently, reducing the processing burden on single cores and enabling better utilization of multi-core processors.
Solution Approach 2:
The patent introduces dynamic control mechanisms where the encoder can adaptively select partitioning modes (raster-scan, rectangular, or no partitioning) based on picture characteristics, content complexity, and performance requirements. This dynamic adaptation optimizes the balance between coding efficiency and processing complexity.
2Adaptability or versatility
If flexible partitioning modes are implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent modifies syntax elements in SPS and PPS to control partitioning behavior, introducing parameters such as `tiles_enabled_flag`, `slices_enabled_flag`, and `slice_mode`. These parameters allow the system to adapt to different picture types and content characteristics while providing a standardized interface for controlling the complexity of the encoding process.
Solution Approach 2:
The partitioning framework is designed to be universal, supporting multiple picture types (I, P, B frames), various slice modes (raster-scan, rectangular), and different tile configurations through a unified syntax structure. This multi-functionality allows the same mechanism to handle diverse video content requirements without requiring separate specialized implementations.
3Productivity
If picture partitioning is enabled, then compression efficiency is improved, but loss of information increases due to partitioning boundaries
Solution Approach 1:
The patent allows different quality characteristics at different regions of the picture by enabling independent processing of tiles and slices. Regions with complex content can use finer partitioning to capture local variations, while homogeneous regions can use coarser partitioning to minimize boundary effects. This local adaptation reduces information loss at partitioning boundaries.
Solution Approach 2:
The patent introduces intermediate processing structures (tiles and slices) that act as mediators between the full picture and the final compressed representation. These intermediaries allow for controlled information flow and enable the application of different processing strategies at different hierarchical levels, reducing the impact of partitioning boundaries on overall quality.
Data Source
AI summary
The present disclosure provides a computer-implemented method for encoding or decoding video. The method includes encoding or decoding, in a plurality of picture parameter sets (PPS) associated with pictures of a coded layer video sequence (CLVS), corresponding first PPS flags indicating whether pictures are allowed to be partitioned into a plurality of tiles or slices. In a first PPS, a corresponding first PPS flag with a first value indicates a first picture of the CLVS is unpartitioned, and in a second PPS, another corresponding first PPS flag with a second value being different from the first value indicates that a second picture of the CLVS is allowed to be partitioned.