Video Coding Residual Signal Correlation Across Color Channels
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Solution Overview
Problem
Existing video coding technologies still exhibit correlation between color channels, which can be utilized for more efficient data representation, but current methods do not fully exploit this correlation.
Innovation Solution
A method for enhanced color channel coding and decoding that involves determining a residual signal for multiple color channels and applying this residual signal across channels to generate reconstructed samples, thereby improving compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If color channels are coded separately with different resolutions (luminance at higher resolution, chrominance at lower resolution), then data compression efficiency is improved, but correlation between channels is not fully exploited
Solution Approach 1:
The patent combines multiple color channel residual signals into a single combined residual signal by summing the absolute differences between channels. This merging approach allows the system to exploit inter-channel correlations while maintaining the benefits of separate channel coding at different resolutions. The combined residual is then processed through a single transform and quantization operation, reducing overall system complexity while improving compression efficiency.
2Productivity
If integer operations are applied to residue data across input channels to generate transformed data, then compression efficiency is improved, but computational complexity increases
Solution Approach 1:
The patent changes the parameters of the transform operation by applying it to the combined residual signal rather than to each channel separately. This parameter change allows the system to achieve compression efficiency through integer operations on the combined residual while avoiding the increased computational complexity that would result from applying transform operations to multiple channels simultaneously.
Data Source
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AI summary
A method for motion compensated prediction, the method comprising determining a residual signal for at least one sample; determining if said residual signal is representing residual for samples in more than one channel; and if affirmative, applying said residual signal for at least a first sample in a first channel for generating a first reconstructed sample; and applying said residual signal for at least a second sample in a second channel for generating a second reconstructed sample.