Layer Identifier Signaling for Video Operation Points

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Solution Overview

Problem

Current video coding techniques face inefficiencies in signaling layer identifiers for operation points, which are essential for extracting scalable and multi-layered or multi-view video bitstreams, leading to suboptimal processing and transmission of video data.

Innovation Solution

The proposed solution involves signaling layer identifiers using a maximum layer ID value and a series of flags to indicate the presence of specific layer IDs within an operation point, allowing for efficient extraction and processing of sub-bitstreams by network entities, such as media-aware network entities (MANEs).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If traditional signaling methods are used for layer identifiers, then complete layer information can be transmitted, but the signaling overhead and processing complexity increase

Engineering Contradiction:

Improvelayer identifier information completenessVSAvoidsignaling processing complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent extracts only the essential layer identifier information that is actually needed for operation point extraction, rather than transmitting complete layer information. By identifying and signaling only the maximum layer ID and presence flags for required layers, the solution reduces signaling overhead while maintaining the ability to correctly identify and extract the needed operation points.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The layer identifier signaling is segmented into two parts: (1) the maximum layer ID value, and (2) presence flags for specific layers. This segmentation allows the decoder to efficiently determine which layers are present without processing unnecessary layer information, reducing complexity while preserving complete layer identification capability.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If detailed layer ID information is signaled for all layers, then accurate operation point extraction is enabled, but bitstream size and transmission overhead increase

Engineering Contradiction:

Improveoperation point identification accuracyVSAvoidbitstream data volume

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

Instead of signaling layer ID information for all possible layers, the patent applies partial action by signaling only the maximum layer ID and presence flags for the specific layers that are actually present in the bitstream. This reduces the quantity of signaled data while maintaining sufficient information for accurate operation point extraction.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent inverts the traditional approach by first signaling the maximum layer ID and then using presence flags to indicate which layers exist, rather than signaling layer IDs in ascending order for all layers. This inversion allows the decoder to skip processing for layers that are not present, reducing bitstream overhead while maintaining accurate layer identification.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP2904789B1Improved signaling of layer identifiers for operation points of a video coder

Publication Date: 2020.11.25 QUALCOMM INC

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AI summary

A device for processing video data receives an indication of a maximum layer identification (ID) value for a bitstream; receives a flag for a first layer with a layer ID value less than the maximum layer ID value; and, based on a value of the flag, determines if the first layer is included in an operation point.