Video Coding Transform Selection for Complexity Reduction
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Solution Overview
Problem
Current video coding standards face challenges in optimizing the interaction between adaptive color transform (ACT) and low-frequency non-separable transform (LFNST), leading to increased complexity and reduced compression performance.
Innovation Solution
Implementing a method that allows video sequences to be coded using either LFNST or ACT exclusively, disabling their combination to simplify the encoding and decoding processes, and enabling ACT only when LFNST is not applied, thereby reducing processing complexity and improving compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If both LFNST and ACT are enabled and combined, then compression performance may be improved, but processing complexity increases significantly
Solution Approach 1:
The patent extracts and separates the LFNST and ACT transform processes into mutually exclusive options. By disabling their combination and forcing exclusive selection, the patent removes the complexity of managing transform interactions while maintaining compression effectiveness through optimized single-transform selection.
Solution Approach 2:
The patent changes the operational parameters of the video coding system by introducing constraints on transform usage. Specifically, it modifies the enabled/disabled status of LFNST and ACT based on coding unit characteristics, transforming them from simultaneously available options into mutually exclusive choices that adapt to content requirements.
2Loss of energy
If LFNST and ACT are combined, then transform effectiveness may be enhanced, but processing time increases
Solution Approach 1:
The patent extracts the time-consuming interaction management between LFNST and ACT by prohibiting their combination. This separation eliminates the need for complex coordination logic and reduces processing latency while maintaining compression effectiveness through optimized single-transform application.
3Measurement precision
If ACT is enabled with LFNST, then color transform accuracy improves, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex interaction management between ACT and LFNST by disabling their simultaneous use. This simplification maintains color transform accuracy by allowing ACT to operate in optimized isolation while reducing the burden of managing transform interactions.
Data Source
AI summary
Methods, apparatus and non-transitory computer readable medium for processing video data are provided. The method includes: receiving one or more video sequences for processing; and coding the one or more video sequences using only one of a low-frequency non-separable transform (LFNST) and an adaptive color transform (ACT) when coding of both LFNST and ACT is not allowed.