Unified Split Flag Context Decoding for Video Coding
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Solution Overview
Problem
The introduction of BT split in video coding schemes increases the complexity and code amount of splitting CTUs into CUs, leading to increased coding/decoding processing, with large code amounts for split flags in QT and BT splits.
Innovation Solution
An image decoding and coding device that reduces the code amounts of split information by determining the context of split information based on neighboring blocks, using context determination methods to decode split flags efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BT split is introduced in addition to QT split for splitting CTUs into CUs, then the flexibility and adaptability of the coding scheme is improved, but the device complexity and code amount increase
Solution Approach 1:
The patent changes the parameter representation by introducing a unified split flag system where a single flag indicates both QT and BT split decisions. Instead of maintaining separate flag parameters for QT split and BT split, the invention uses one parameter (split flag) that encodes both splitting mode decisions, thereby reducing the code amount while preserving the ability to represent both QT and BT split patterns.
2Loss of information
If both QT split flag and BT split flag are coded separately, then the split information is explicitly represented, but the code amount becomes large
Solution Approach 1:
The patent merges the QT split flag and BT split flag into a single unified split flag. The unified flag combines the information from both separate flags into one parameter, reducing the total code amount from two separate flag codes to one consolidated flag code while maintaining complete split information representation.
Solution Approach 2:
The unified split flag serves multiple functions simultaneously: it indicates whether a QT split is applied, and it indicates whether a BT split is applied. This multi-functional parameter replaces two separate single-function parameters, achieving code amount reduction while preserving all necessary split information.
Data Source
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AI summary
An image decoding device includes a context determination unit configured to determine a context of split information of a target block with reference to split-related information of at least one neighboring block adjacent to the target block; and a split information decoding unit configured to decode the split information of the target block by using the context determined by the context determination unit.