Chroma Quad Tree Split Constraint in Video Encoding
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Solution Overview
Problem
Current video coding technologies face challenges in efficiently managing chroma quad tree splits and coding block sizes, leading to suboptimal compression efficiency and increased computational complexity, particularly in handling chroma blocks with varying subsampling factors and prediction modes.
Innovation Solution
The proposed solution involves processing circuitry that decodes partition information from a coded video bitstream to determine whether a chroma quad tree split is allowed based on block size, subsampling factors, and prediction modes, allowing for the disallowance of certain splits to optimize chroma coding tree structures and improve compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chroma quad tree splits are allowed for all chroma blocks, then compression efficiency can be improved, but computational complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the minimum chroma block size threshold based on chroma subsampling factors and prediction modes. Different threshold values are used for different chroma block types (e.g., 4x4 for 4:2:0 subsampling, 8x8 for 4:2:2), which optimizes the balance between compression efficiency and computational complexity by enabling splits only when beneficial
Solution Approach 2:
The patent implements dynamics by making the quad tree split decision adaptive rather than static. The system dynamically evaluates each chroma block's properties (subsampling factor, prediction mode, block size) to determine whether splitting is beneficial, allowing the coding tree structure to adapt to varying video content characteristics
2Manufacturing precision
If chroma blocks with small sizes are processed, then coding precision is improved, but device complexity increases
Solution Approach 1:
The patent uses parameter changes by establishing different minimum size thresholds for chroma blocks based on their subsampling factors and prediction modes. This allows the system to maintain appropriate coding precision for small chroma blocks while avoiding unnecessary processing complexity by preventing splits when block sizes fall below the dynamically determined thresholds
3Adaptability or versatility
If all chroma block sizes are allowed, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically determining minimum chroma block size thresholds based on chroma subsampling factors and prediction modes. This allows the system to maintain adaptability to different chroma block configurations while introducing manageable constraints that reduce processing complexity by preventing unnecessary splits
Data Source
AI summary
Aspects of the disclosure provide a method and an apparatus for video encoding. Whether a block size cbSize of a chroma block in luma samples is less than or equal to a minimum allowed chroma quaternary tree (QT) leaf node size MinQtSizeC in luma samples such that cbSize <=MinQtSizeC is determined. In response to the block size cbSize of the chroma block in luma samples being less than or equal to the minimum allowed chroma QT leaf node size MinQtSizeC in luma samples, a QT split is determined as disallowed for the chroma block. Partition information indicating that a chroma coding tree structure in a dual tree is applied to the chroma block is generated, the partition information further indicating the block size cbSize of the chroma block in luma samples and the minimum allowed chroma QT leaf node size MinQtSizeC in luma samples.