Unified Parameter Derivation for LIC and CCLM Video Coding
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Solution Overview
Problem
Existing video coding technologies face complexity in implementing local illumination compensation (LIC) and cross-component linear model prediction mode (CCLM) due to separate parameter derivation procedures, leading to increased encoder and decoder size and difficulty in adjusting to internal bit depth changes.
Innovation Solution
Unifying the parameter derivation procedures for LIC and CCLM, allowing both coding tools to use a common regression parameter derivation process, which simplifies hardware and software implementations without compromising coding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate parameter derivation procedures are implemented for LIC and CCLM, then coding quality can be optimized for each mode, but device complexity and implementation size increase
Solution Approach 1:
The patent merges the separate parameter derivation procedures for LIC and CCLM into a unified procedure. Both LIC and CCLM modes now use the same regression parameter derivation process, which reduces the number of separate implementation paths in the encoder and decoder, thereby reducing device complexity and implementation size while maintaining the ability to optimize coding quality for each mode through mode-specific parameter usage
Solution Approach 2:
The patent creates a universal parameter derivation procedure that serves both LIC and CCLM modes. The unified regression parameter derivation process can be applied to both coding modes, making the implementation more versatile and reducing the need for separate specialized procedures, thus reducing overall device complexity while maintaining mode-specific optimization capabilities
2Measurement precision
If separate parameter derivation procedures are implemented for LIC and CCLM, then mode-specific optimization is possible, but ease of implementation and adaptability to bit depth changes decrease
Solution Approach 1:
The unified parameter derivation procedure provides a single implementation path that handles both LIC and CCLM modes, making the implementation easier and more adaptable to internal bit depth changes. The procedure includes bit depth adjustment mechanisms that can be applied universally across both modes, reducing the complexity of adapting to different bit depth requirements
3Device complexity
If unified parameter derivation procedure is used for LIC and CCLM, then device size is reduced, but potential mode-specific optimization opportunities are lost
Solution Approach 1:
The patent combines the parameter derivation procedures while preserving mode-specific optimization capabilities. The unified procedure uses the same regression parameter derivation process for both LIC and CCLM, reducing device size, but allows each mode to utilize the derived parameters according to its specific requirements, thereby maintaining coding quality optimization opportunities for each mode
Data Source
AI summary
A device for coding video data can be configured to perform a parameter derivation operation to determine one or more first parameters for a first block of video data; performing the parameter derivation operation to determine one or more second parameters for a second block of video data that is coded in a different coding mode than the first block of video data; code the first block of video data based on the one or more first parameters; and code the second block of video data based on the one or more second parameters.