Chroma Deblocking Boundary Strength for Joint CbCr Residual Coding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the increased amount of information, necessitating high-efficient image compression technologies.
Innovation Solution
An image encoding/decoding method and apparatus that determines boundary strength for deblocking filtering, utilizing joint CbCr residual coding and flags to enhance encoding/decoding efficiency, and transmits a bitstream generated by this method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the boundary strength parameter in deblocking filtering based on transform coefficient characteristics. By changing the filtering strength parameter according to the presence and magnitude of transform coefficients, the system optimizes the balance between image quality preservation and data reduction, resolving the contradiction between high-quality image transmission and transmission cost.
2Manufacturing precision
If deblocking filtering is applied to reduce blocking artifacts, then image quality is improved, but processing time increases
Solution Approach 1:
The patent implements dynamics by making the deblocking filtering strength adaptive rather than fixed. The boundary strength parameter is dynamically adjusted based on the transform coefficient data of adjacent blocks, allowing the system to apply strong filtering only where needed and reduce or skip filtering where artifacts are minimal, thus optimizing processing time while maintaining image quality.
Solution Approach 2:
The patent applies local quality by differentiating the deblocking filtering strength across different boundary regions based on local transform coefficient characteristics. Instead of applying uniform filtering, the system adjusts boundary strength locally according to the presence of non-zero coefficients in adjacent blocks, reducing overall processing time while maintaining quality where most needed.
3Measurement precision
If boundary strength is determined using multiple flags and conditions, then filtering accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the boundary strength determination process into multiple independent steps, each evaluating a specific flag or condition (first flag for transform coefficient presence, second flag for non-zero coefficient detection). This segmented approach improves measurement precision through comprehensive condition checking while managing complexity by organizing the determination logic into discrete, manageable segments.
Data Source
AI summary
An image encoding/decoding method and apparatus are provided. An image decoding method according to the present disclosure may comprise obtaining a reconstructed picture, determining a target boundary of deblocking filtering in the reconstructed picture, determining a boundary strength for the target boundary, and applying deblocking filtering to the target boundary based on the boundary strength. Based on the target boundary being a transform block boundary and a color component of the reconstructed picture being a chroma component, the boundary strength may be determined based on whether joint CbCr residual coding is performed on at least one of two blocks adjacent to the target boundary, and the joint CbCr residual coding may correspond to encoding residual samples for a chroma Cb component and a chroma Cr component as a single transform block.