Chroma Quantization Parameter Derivation Using Piece-Wise Linear Functions

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Solution Overview

Problem

Current video coding standards, such as ITU-T H.264 and HEVC, face limitations in efficiently deriving quantization parameters for chroma components, which affects video compression and decoding processes.

Innovation Solution

The method involves determining a quantization parameter for a chroma component using a piece-wise linear function and incorporating it into the video coding process to enhance quantization, allowing for more flexible and efficient derivation of quantization parameters, particularly through the use of syntax elements in parameter sets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If current video coding standards (ITU-T H.264, HEVC) are used for deriving quantization parameters, then video compression can be achieved, but the derivation process lacks flexibility and efficiency particularly for chroma components

Engineering Contradiction:

Improveflexibility of quantization parameter derivationVSAvoidefficiency of quantization parameter derivation

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent divides the quantization parameter derivation into multiple segments: a base quantization parameter is established first, then separate delta quantization parameters are applied for different chroma components (Cb and Cr). This segmentation allows independent optimization of each component while maintaining overall efficiency

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic adjustment mechanisms where delta quantization parameters can be selectively applied based on picture type, chroma format, and other coding conditions. This dynamic approach enables the system to adapt flexibility to specific scenarios without sacrificing derivation efficiency

Inventive Principle:

Principle #15Dynamics

2Productivity

If a fixed quantization parameter derivation method is used, then the decoding process is simple, but the video compression performance is limited

Engineering Contradiction:

Improvevideo compression performanceVSAvoidcomplexity of quantization parameter derivation

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies different quantization adjustments to different chroma components (Cb and Cr) based on their specific characteristics and the picture content. This local quality approach allows optimized compression performance for each component without requiring complete rederivation of all parameters

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent pre-establishes a base quantization parameter that can be reused across multiple coding units and components. This preliminary action reduces the complexity of derivation by avoiding recalculation of common parameters, while still enabling performance optimization through selective delta adjustments

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20240340424A1Systems and methods for deriving quantization parameters for video blocks in video coding

Publication Date: 2024.10.10 SHARP KK

AI summary

A video coding device may be configured to perform video coding according to one or more of the techniques described herein.