Video Decoder Syntax Signaling for Chroma Deblocking Parameters
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently compressing video data without sacrificing picture quality, particularly in scenarios with limited network bandwidth or memory resources, due to inefficient signaling of deblocking control parameters for chroma components.
Innovation Solution
A conditional signaling scheme is introduced for deblocking control parameters, where the parameters are only signaled when the video sequence has a color component, and when the chroma format is not (4:0:0 or 4:4:4 with separate colour plane coding mode, the parameters are omitted, with values derived from picture parameter sets, headers, or slice headers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deblocking control parameters for chroma component are always signaled in bitstream, then decoding accuracy is improved, but bitstream utilization deteriorates
Solution Approach 1:
The patent changes the signaling parameter from always transmitting deblocking control parameters to conditionally transmitting them based on chroma format type. For formats (4:0:0) and (4:4:4 with separate colour plane coding), the parameters are not signaled as they can be derived from luma parameters, while for other formats the parameters are signaled. This conditional parameter change optimizes bitstream utilization while maintaining decoding accuracy where needed.
2Loss of substance
If deblocking control parameters are conditionally signaled based on chroma format, then compression ratio is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by treating different chroma formats differently in terms of parameter signaling. Instead of using a uniform approach for all formats, the system selectively signals parameters only when necessary (for formats other than 4:0:0 and 4:4:4 with separate colour plane coding). This localized differentiation improves compression ratio without requiring complex decision logic across all possible formats.
3Productivity
If deblocking control parameters are not signaled for certain chroma formats, then bitstream efficiency is improved, but reliability deteriorates
Solution Approach 1:
The patent uses luma deblocking control parameters as an intermediary to provide chroma deblocking parameters for specific chroma formats. When chroma-specific parameters are not signaled (for formats 4:0:0 and 4:4:4 with separate colour plane coding), the decoder derives chroma parameters from the luma parameters, ensuring reliable parameter availability while maintaining bitstream efficiency. This intermediary approach prevents parameter unreliability without requiring redundant signaling.
Data Source
AI summary
A method of coding is disclosed. The method comprises obtaining a bitstream for a coding block; obtaining a value of a syntax from the bitstream; obtaining a value of deblocking control parameter from the bitstream, when the value of the syntax is equal to a preset value.