Temporal Sub-Layer Signaling in Video Coding for Simpler Reference Lists

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The existing video coding standards, such as JVET-O2001, have inefficient and complex signaling mechanisms for inter layer reference pictures, leading to suboptimal reference picture list management.

Innovation Solution

The proposed techniques simplify the signaling of reference picture lists by reducing the number of syntax elements required to specify whether an entry is an inter layer reference picture, long term reference picture, or short term reference picture, thereby optimizing the signaling process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the existing video coding standards use complex signaling mechanisms for inter layer reference pictures, then the reference picture list management can be comprehensive, but the signaling complexity and bit usage increase

Engineering Contradiction:

Improvereference picture list management capabilityVSAvoidsignaling complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the reference picture list into different types (inter layer reference pictures and non-reference pictures) and uses different signaling mechanisms for each segment. This allows comprehensive reference picture list management while reducing overall signaling complexity by applying simplified rules to specific segments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of explicitly signaling every detail about reference picture types using complex mechanisms, the patent inverts the approach by using implicit defaults and inference rules. When certain conditions are met, the reference picture list management is simplified through inverted logic that reduces signaling bits while maintaining comprehensive functionality.

Inventive Principle:

Principle #13The other way round (Inversion)

2Measurement precision

If more syntax elements are used to specify reference picture types, then the precision of reference picture identification improves, but the bit usage and signaling overhead increase

Engineering Contradiction:

Improvereference picture identification precisionVSAvoidbit usage

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies local quality by using different levels of precision for different parts of the reference picture list. Inter layer reference pictures use one set of identification rules while non-reference pictures use another, allowing precise identification where needed without unnecessarily increasing bit usage across the entire list.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameters of the signaling mechanism based on the context. Instead of using a fixed number of syntax elements for all reference picture types, the system adapts the signaling parameters dynamically, using fewer bits when possible and more bits only when necessary to maintain precise identification.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250220245A1Systems and methods for signaling temporal sub-layer information in video coding

Publication Date: 2025.07.03 SHARP KK

AI summary

This disclosure relates to video coding and more particularly to techniques for signaling temporal sub-layer information for coded video. According to an aspect of an disclosure, a range of a value of a third syntax element in a sequence parameter set is determined based on whether the sequence parameter set refers to a video parameter set, wherein the third syntax element specifies a maximum number of temporal sub-layers that is present in each coded video sequence referring to the sequence parameter set.