Subpicture Reference Picture Lists for Motion Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image encoding/decoding technologies face challenges in efficiently handling high-resolution and high-definition images, particularly in configuring reference picture lists for motion compensation when the location of reference subpictures differs from the target subpictures, and managing the number of activated reference indexes.
Innovation Solution
The method involves determining a reference picture list and override for the number of activated reference indexes in the slice header, even when specific Network Abstraction Layer (NAL) unit types are not present, using bitstream information to manage these configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference picture lists are configured for motion compensation when reference subpicture location differs from target subpicture location, then motion compensation accuracy is improved, but device complexity increases
Solution Approach 1:
The picture is divided into multiple subpictures, each with its own reference picture list configuration. This segmentation allows independent optimization of reference picture selection for different spatial regions, improving motion compensation accuracy without requiring complex global configuration. The slice header contains subpicture information that enables this segmented approach.
Solution Approach 2:
The reference picture list is dynamically configured based on the relative locations of target and reference subpictures. The system adapts the reference picture list configuration according to the specific spatial relationship between subpictures, rather than using a fixed configuration. This dynamic adaptation improves motion compensation accuracy while managing complexity through context-based configuration.
2Adaptability or versatility
If the number of activated reference indexes is overridden in the slice header, then encoding flexibility is improved, but bitstream complexity increases
Solution Approach 1:
The override of activated reference indexes is applied locally at the slice header level rather than globally. This allows different slices to have different numbers of activated reference indexes based on their specific content requirements. The first information in the slice header enables this localized control, providing encoding flexibility without requiring complex global bitstream structure changes.
Solution Approach 2:
The number of activated reference indexes is predetermined and signaled in the slice header before actual encoding proceeds. This preliminary configuration allows the encoder to optimize reference picture usage for each slice based on pre-analyzed characteristics, improving encoding flexibility while maintaining a relatively simple bitstream structure through advance parameter specification.
3Measurement precision
If reference picture list determination is performed in slice header for non-specific NAL unit types, then decoding accuracy is improved, but processing time increases
Solution Approach 1:
The reference picture list is determined and configured in the slice header during the parsing phase, before actual decoding operations commence. This preliminary determination allows the decoder to have reference picture lists ready in advance, improving decoding accuracy through proper reference picture selection while minimizing processing time during the actual decoding by avoiding runtime calculations.
Solution Approach 2:
The slice header structure is designed to self-contain the necessary reference picture list determination information for non-specific NAL unit types. This self-service approach allows the decoder to extract and configure reference picture lists directly from the slice header without requiring additional complex processing or external information, improving both accuracy and processing efficiency.
Data Source
AI summary
Disclosed herein are a method, an apparatus and a storage medium for performing encoding/decoding on an image using a subpicture. A picture may be partitioned into various units such as subpictures and slices, and various syntax elements and structures may be used to specify the units. In an embodiment, there is a method for configuring a reference picture list for motion compensation in the case where the location of a reference subpicture to be referred to for motion compensation is different from the location of a target subpicture. Further, in an embodiment, there is provided a method for providing the configuration of a reference picture list and an override on the number of activated reference indexes.