Video Coding Quantization Parameter Modification in Transform Skip Mode

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Solution Overview

Problem

Current video coding technologies face challenges in efficiently encoding and decoding digital video due to increasing bandwidth demands and the need for improved compression efficiency, particularly in handling screen content and diverse video formats.

Innovation Solution

The proposed techniques involve using a palette coding mode in video decoders and encoders, which includes converting video blocks into coded representations using an identity transform coding tool. This involves modifying the quantization parameter and selectively including syntax elements to optimize coding efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional video coding methods are used, then compatibility with existing standards is maintained, but compression efficiency and bandwidth utilization are insufficient

Engineering Contradiction:

Improvecompression efficiencyVSAvoidbandwidth consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent modifies the quantization parameter (QP) based on the transform skip mode and palette coding decisions. When transform skip is applied and palette coding is selected, the QP is adjusted to optimize compression efficiency. This parameter change allows the system to achieve better compression ratios while maintaining compatibility with existing video coding frameworks, directly addressing the contradiction between compression efficiency and bandwidth consumption.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamic adaptation of coding parameters based on local video characteristics. The transform skip mode is selectively applied based on the residual block properties and palette coding potential. This dynamic decision-making process optimizes compression efficiency for each block while controlling overall bandwidth usage, resolving the contradiction between improved compression and reduced bandwidth consumption.

Inventive Principle:

Principle #15Dynamics

2Productivity

If identity transform coding tool is used for transform skip mode, then compression efficiency is improved, but quantization parameter modification complexity increases

Engineering Contradiction:

Improvecompression efficiencyVSAvoidquantization parameter modification complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a self-service mechanism where the quantization parameter modification is automatically determined based on the transform skip mode and palette coding decisions. The QP adjustment logic is integrated into the existing coding framework, allowing the system to self-optimize compression efficiency without requiring complex external control mechanisms. This reduces the overall system complexity while maintaining improved compression efficiency.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent creates a universal quantization parameter modification rule that applies across different video blocks and coding scenarios. The same QP adjustment logic is used whether the block is coded in transform skip mode or traditional transform mode, simplifying the implementation. This multi-functional approach maintains compression efficiency improvements while avoiding the complexity of separate handling for different coding scenarios.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If palette coding mode is implemented, then screen content coding efficiency is improved, but compatibility with existing video coding standards is reduced

Engineering Contradiction:

Improvescreen content coding efficiencyVSAvoidcompatibility with existing video coding standards

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent segments the video coding process into independent blocks, allowing palette coding to be applied selectively to specific blocks that benefit from it (such as screen content regions) while traditional coding methods are used for other blocks. This segmentation approach enables improved screen content coding efficiency without requiring complete redesign of the entire video coding standard, thus maintaining compatibility with existing standards.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies palette coding only when necessary and beneficial, rather than universally. The transform skip mode is selectively applied based on residual block properties and palette coding potential assessment. This partial application strategy improves screen content coding efficiency where applicable while maintaining compatibility with existing standards for cases where palette coding is not suitable, resolving the contradiction between specialized efficiency and general compatibility.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12206850B2Techniques for modifying quantization parameter in transform skip mode

Publication Date: 2025.01.21 BYTEDANCE INC

AI summary

A method of video processing is described. The method includes performing a conversion between a current video block of a video and a coded representation of the current video block according to a rule, wherein the rule specifies that, due to use of an identity transform coding tool for representing the current video block into the coded representation, a syntax field indicative of a quantization parameter used for decoding the current video block is included such that a value of the quantization parameter is modified according to a rule, wherein the identity transform coding tool allows coefficient values at a transform domain of the current block to be same as values of a residual block of the current video block.