Inter-Region Partitioning for Separate Luma and Chroma Coding
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Solution Overview
Problem
Existing video coding technologies do not effectively utilize different partitioning strategies for chroma and luma blocks, leading to inefficiencies in compression and increased overhead due to chroma blocks having less texture than luma blocks.
Innovation Solution
Implementing different partitioning for chroma and luma blocks within a coding region, where luma blocks are coded using inter prediction mode and chroma blocks are coded using chroma from luma (CfL) prediction mode, and applying distinct partitioning based on a size threshold to reduce further partitioning of chroma blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same partitioning strategy is applied to both chroma and luma blocks, then the coding structure is simple and easy to implement, but coding efficiency is reduced due to unnecessary overhead and failure to capture chroma-luma correlations
Solution Approach 1:
The patent applies segmentation by dividing the coding process into separate partitioning operations for luma and chroma blocks. The luma block undergoes recursive partitioning based on texture complexity, while the chroma block uses a distinct partitioning strategy that may restrict further partitioning. This segmentation allows each color component to be processed according to its specific characteristics, improving coding efficiency without requiring complex integrated partitioning logic.
Solution Approach 2:
The patent implements local quality by applying different partitioning rules to different parts of the coding structure. Specifically, luma blocks use one partitioning approach while chroma blocks use another, allowing each component to have optimized processing tailored to its local characteristics. This is achieved through separate partitioning functions that can be independently configured based on the specific requirements of each color component.
2Productivity
If chroma blocks are further partitioned like luma blocks, then the partitioning is uniform and consistent, but overhead increases and coding efficiency decreases due to redundant processing of low-texture chroma regions
Solution Approach 1:
The patent applies partial action by selectively applying partitioning operations only where necessary. For chroma blocks, the partitioning process may be restricted or stopped earlier than for luma blocks, since chroma regions typically have less texture variation. This partial partitioning approach avoids the excessive processing that would occur if the same recursive partitioning were applied to chroma blocks as to luma blocks, thereby reducing overhead while maintaining adequate compression performance.
3Manufacturing precision
If different prediction modes are used for luma and chroma blocks, then coding accuracy improves by capturing chroma-luma correlation, but the complexity of the coding process increases
Solution Approach 1:
The patent applies merging by combining the partitioning results of luma and chroma blocks at the reconstruction stage. After separate partitioning and prediction operations are performed on each color component using their respective optimized strategies, the results are merged to form the final coded representation. This merging approach allows the system to benefit from both the improved accuracy of different prediction modes and the efficiency of unified reconstruction processes.
Data Source
AI summary
An example method includes receiving a video bitstream comprising a plurality of coding blocks. The method includes identifying, based on a first indicator in the video bitstream, a coding region that comprises two or more luma blocks and two or more chroma blocks. A subset of luma blocks in the coding region is encoded in a first prediction mode. Each chroma block in the coding region is encoded in a second prediction mode. The method includes applying a first partitioning to the two or more luma blocks in the coding region. The method includes applying a second partitioning for the two or more chroma blocks in the coding region. The method includes reconstructing the coding region using the first partitioning and the second partitioning.