SAO Parameter Reuse in Scalable Video Coding
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Solution Overview
Problem
Current scalable video coding schemes face challenges in minimizing resource usage, particularly computational resources, for efficient encoding and decoding processes, especially in the HEVC-SVC standard.
Innovation Solution
Implementing inter-layer Sample Adaptive Offset (SAO) parameter re-use, where SAO filter parameters from a lower-layer bitstream are directly reused or partially reused to encode the enhancement layer bitstream, improving the SAO filtering process in next-generation SVC enhancement layer coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If SAO filter parameters are determined and transmitted for each enhancement layer, then the quality of reconstructed pictures is improved, but the computational resources and resource usage increase
Solution Approach 1:
The patent applies the copying principle by reusing SAO filter parameters from the base layer to encode enhancement layers. Instead of determining and transmitting separate SAO parameters for each enhancement layer, the encoder copies parameters from the base layer, significantly reducing computational resources while maintaining picture quality through the residual signal approach
Solution Approach 2:
The patent implements universality by making the base layer SAO parameters serve multiple functions - they are used for both the base layer reconstruction and for enhancing multiple enhancement layers. This multi-functional use of parameters reduces overall system complexity and resource usage across the scalable video coding structure
2Adaptability or versatility
If separate SAO parameters are transmitted for each layer, then the adaptability to different layers is improved, but the resource usage and transmission overhead increase
Solution Approach 1:
The patent extracts only the necessary SAO parameters from the base layer for reuse in enhancement layers, rather than transmitting complete separate parameter sets. This selective extraction approach maintains adaptability where needed while minimizing resource usage by avoiding redundant parameter transmission
Solution Approach 2:
The patent changes the parameter transmission strategy from layer-specific separate parameters to shared base layer parameters with selective reuse. This parameter management approach reduces the quantity of transmitted data while maintaining the ability to adapt to different layer requirements through the enhancement layer encoding process
Data Source
AI summary
Described herein are techniques related to re-use of filter parameters, and particularly Sample Adaptive Offset (SAO) parameters, of a lower-layer bitstream or a coded enhancement layer bitstream for coding enhancement layer bitstream in a scalable video encoding.