Output Layer Set Signaling for Multi-Layer Video Decoding

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing video coding standards face challenges in efficiently signaling and managing output layer set information, particularly in scenarios involving multiple layers and hypothetical reference decoder parameters, which can lead to inefficiencies in decoding processes.

Innovation Solution

The proposed solution involves parsing syntax elements to determine the presence of multiple output layers and conditionally signaling hypothetical reference decoder parameters based on these elements, enabling more precise management of decoding processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If hypothetical reference decoder parameters are always signaled in video parameter sets, then decoding accuracy is improved, but bitstream overhead increases

Engineering Contradiction:

Improvedecoding accuracyVSAvoidbitstream overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent makes the signaling of hypothetical reference decoder parameters dynamic by introducing a syntax element that conditions their presence in the video parameter set. Instead of always signaling these parameters, the system adapts their inclusion based on whether multiple output layers are present, optimizing the balance between decoding accuracy and bitstream overhead.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter state of hypothetical reference decoder parameters from always-present to conditionally-present. By introducing a control syntax element that modifies the presence/absence state of these parameters based on the number of output layers, the system optimizes bitstream efficiency while maintaining necessary decoding accuracy.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If output layer set information is extensively signaled for multiple layers, then layer management precision is improved, but device complexity increases

Engineering Contradiction:

Improvelayer management precisionVSAvoiddecoding process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent extracts only the necessary hypothetical reference decoder parameters from the video parameter set by using a syntax element to conditionally signal them. This selective extraction approach maintains precise layer management for multi-layer scenarios while avoiding the complexity of always processing and managing all possible parameters regardless of scenario.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12506902B2Systems and methods for signaling output layer set information in video coding

Publication Date: 2025.12.23 SHARP KK

AI summary

A device may be configured to signal output layer set information according to one or more of the techniques described herein. The device comprising one or more processors configured to: receiving a video parameter set including syntax elements; parsing first syntax element from the video parameter set specifying whether at least one output layer set specified by the video parameter set contains more than one layer; and parsing second syntax element specifying whether the video parameter contains sequence-level hypothetical reference decoder parameters in a case that the first syntax element specifies that at least one output layer set specified by the video parameter set contains more than one layer.