Chroma Quantization Parameter Signaling via Palette Coding

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Solution Overview

Problem

The increasing demand for high-resolution and high-quality images and videos, particularly for immersive media like VR and AR, necessitates a high-efficiency compression technology to effectively compress and transmit or store these files, with a specific need for improving chroma quantization parameter signaling in image/video coding.

Innovation Solution

The method involves using a palette coding syntax that includes index information for a chroma quantization parameter offset list, allowing for efficient derivation and use of chroma quantization parameters in image/video coding, and defining conditions for signaling these parameters to improve coding efficiency and reduce redundancy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high-resolution and high-quality image/video data are transmitted using existing wideband lines or storage media, then image quality is improved, but transmission costs and storage costs are increased

Engineering Contradiction:

Improveimage qualityVSAvoidtransmission cost

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent extracts and transmits only the essential chroma quantization parameter offset information rather than complete chroma data, separating critical quality-preserving parameters from redundant information to reduce transmission burden while maintaining image quality

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the representation parameters by using differential coding for chroma quantization parameters (transforming absolute values into relative offsets from luma parameters), which reduces the bit depth and transmission requirements while preserving the essential quality characteristics

Inventive Principle:

Principle #35Parameter changes

2Reliability

If chroma quantization parameter information is signaled without conditions, then coding completeness is improved, but coding redundancy is increased

Engineering Contradiction:

Improvecoding completenessVSAvoidcoding redundancy

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent introduces dynamic conditional signaling where the chroma quantization parameter offset information is signaled only when specific conditions are met (when chroma_qp_offset_list_cb_minus1 > 0 or chroma_qp_offset_list_cr_minus1 > 0), making the coding structure adaptive rather than static

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies different coding strategies to different chroma components (Cb and Cr) based on their specific offset list lengths, allowing each component to be coded with appropriate detail only where necessary, reducing overall redundancy while maintaining local quality where needed

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20220368907A1Image or video coding based on signaling of quantization parameter-related information

Publication Date: 2022.11.17 LG ELECTRONICS INC

AI summary

According to the disclosure of the present document, chroma quantization parameter offset-related information may be signaled via a palette coding syntax, and index information about a chroma quantization parameter offset list may be efficiently parsed/signaled on the basis of information about the number of entries within the chroma quantization parameter offset list. Accordingly, bits that need to be signaled for video/image coding can be reduced, and coding efficiency can be improved.