ISP Chroma Transform Block Sizing for Single-Tree Coding
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Solution Overview
Problem
Existing video coding technologies face challenges in achieving efficient compression of video data without sacrificing picture quality, particularly in determining the size of chroma transform blocks for Intra Sub-Partitions (ISP) coding mode.
Innovation Solution
A method and apparatus for determining the size of chroma transform blocks based on chroma format information and using Intra Sub-Partitions (ISP) when a single tree partitions the coding unit, ensuring accurate and versatile block splitting for luma and chroma components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Intra Sub-Partitions (ISP) coding mode is used for splitting luma coding block, then prediction accuracy is improved, but determining chroma transform block size becomes complex and less versatile
Solution Approach 1:
The patent changes the parameter used for determining chroma transform block size from complex conditional logic to simple chroma block dimensions. By using chroma block width and height directly (with scaling factors SubWidthC and SubHeightC), the patent simplifies the determination process while maintaining accurate chroma prediction in ISP coding mode
Solution Approach 2:
Instead of determining chroma transform block size through complex rules that check multiple conditions (tree type, ISP usage, block size), the patent inverts the approach by directly deriving chroma transform block size from chroma block dimensions. This reversal simplifies the logic while ensuring compatibility with ISP coding mode
2Adaptability or versatility
If chroma transform block size is determined using complex conditional rules, then compatibility with different coding modes is improved, but processing efficiency and productivity decrease
Solution Approach 1:
The patent creates a universal method for determining chroma transform block size that works across multiple coding modes (including ISP, LIP, and conventional modes). By using a unified formula based on chroma block dimensions and chroma format parameters, the patent eliminates the need for separate determination rules for different coding modes, thereby improving processing efficiency while maintaining broad compatibility
Solution Approach 2:
The patent changes from complex conditional parameter determination to a unified parameter-based formula. By using chroma block width, chroma block height, and chroma format parameters (SubWidthC, SubHeightC), the patent achieves a simple yet versatile determination method that works efficiently across all coding modes
Data Source
AI summary
Apparatuses and methods for Intra Sub-Partitions (ISP) are provided. The method includes: obtaining information of ISP, and determining a size of a chroma transform block (TB) of the coding unit based on SubWidthC and SubHeightC when at least a first condition is fulfilled. The first condition includes the information of ISP indicates that ISP is used for splitting the luma coding block. SubWidthC and SubHeightC are variables depending on chroma format information. The chroma format information indicates a chroma format of a picture the coding unit belongs to. The method can apply to all chroma format. The chroma format includes at least one of: 4:2:0, or 4:2:2, or 4:4:4. An accurate and versatile way to determine the size of the chroma transform block for the ISP is achieved.