Local Illumination Compensation Parameter Refinement
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Solution Overview
Problem
Existing video coding technologies face challenges in improving coding quality due to limitations in illumination compensation, particularly in refining model parameters for local illumination compensation (LIC) models.
Innovation Solution
A method for video processing that involves obtaining adjusting parameters for a LIC model, updating the model parameters based on these adjusting parameters, and using the updated parameters for video block conversion to enhance coding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional video coding techniques are used, then device complexity is kept simple, but coding quality cannot be sufficiently improved
Solution Approach 1:
The patent applies parameter changes by introducing adjusting parameters (a and b) to the LIC model parameters (alpha and beta). The model parameters are updated using the formulas: alpha = a * alpha + (1-a) * alpha' and beta = b * beta + (1-b) * beta', where alpha' and beta' are original LIC model parameters. This allows refinement of illumination compensation parameters to improve coding quality while maintaining manageable complexity through controlled parameter adjustments.
2Manufacturing precision
If LIC model parameters are refined with adjusting parameters, then coding quality is improved, but computational complexity increases
Solution Approach 1:
The patent implements parameter changes by deriving adjusting parameters a and b from gradient calculations: a = (Gx1 - Gx2) / (Gx1 + Gx2 + epsilon) and b = ( Gy1 - Gy2) / (Gy1 + Gy2 + epsilon), where Gx1, Gx2, Gy1, and Gy2 are horizontal and vertical gradients from current and reference blocks. This approach refines LIC model parameters through controlled mathematical transformations that improve coding quality while managing computational complexity through efficient gradient-based adjustments.
Data Source
AI summary
Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: obtaining, for a conversion between a current video block of a video and a bitstream of the video, values for a set of adjusting parameters associated with values for a set of model parameters of a local illumination compensation (LIC) model for coding the current video block; updating the values for the set of model parameters based on the values for the set of adjusting parameters; and performing the conversion based on the updated values for the set of model parameters.