Cross-Component Coefficient Offsets for Efficient Video Reconstruction
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently reconstructing cross-component transform coefficients, particularly in intra and inter prediction methods, leading to suboptimal compression efficiency and increased bandwidth requirements.
Innovation Solution
The method involves deriving offsets based on quantization step sizes and transform coefficients across different color components to enhance the reconstruction process, allowing for improved decoding and encoding of video data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional video coding techniques are used for cross-component transform coefficient reconstruction, then implementation complexity is reduced, but compression efficiency deteriorates
Solution Approach 1:
The patent introduces an intermediary offset value that mediates between the first transform coefficient (from first color component) and the second transform coefficient (from second color component). This offset serves as a bridge to transfer information across color components, improving reconstruction accuracy without requiring direct complex interactions between components. The offset is derived using a simplified formula involving quantization step sizes and transform coefficients, balancing complexity and efficiency.
Solution Approach 2:
The patent changes the parameter representation by working in the transform coefficient domain rather than the sample value domain. By deriving offsets based on quantized transform coefficients and applying them during reconstruction, the method exploits the statistical properties of transform coefficients to improve compression efficiency. The parameter transformation occurs through the relationship: offset = (first_transform_coefficient × quantization_step_size_first) / quantization_step_size_second, which operates on compressed representation parameters.
2Measurement precision
If more transform coefficient information is used across color components, then reconstruction accuracy is improved, but bandwidth requirements increase
Solution Approach 1:
The patent extracts only the essential cross-component information needed for reconstruction by deriving a single offset value from the relationship between transform coefficients of different color components. Instead of transmitting all transform coefficients across all components, the method extracts the critical cross-component correlation information embedded in the offset, which is then applied during reconstruction. This selective extraction reduces bandwidth while maintaining reconstruction accuracy.
Solution Approach 2:
The patent applies partial action by using a simplified offset derivation that captures the dominant cross-component relationship without fully processing all possible transform coefficient interactions. The offset formula uses a subset of available information (first transform coefficient and quantization step sizes) rather than all possible coefficient relationships, achieving sufficient reconstruction accuracy with reduced computational and bandwidth resources.
Data Source
AI summary
This disclosure relates generally to video coding and particularly to methods and systems for deriving offsets in cross-component transform coefficient level reconstruction. An example method for decoding a current video block of a video bitstream is disclosed. The method includes receiving a coded video bitstream; extracting, from the coded video bitstream, a first transform coefficient of a first color component for a current video block; determining a second transform coefficient of a second color component for the current video block; deriving an offset value based on at least one of the following: a quantization step size, or the first transform coefficient; adding the offset value to the second transform coefficient to generate a modified second transform coefficient for the second color component; and decoding the current video block based on the first transform coefficient and the modified second transform coefficient of the second color component.