Picture Header Signaling Layout for Smaller Video Bitstreams

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing video coding technologies face challenges in efficiently determining the starting point of a picture within a multi-layer bitstream, leading to unnecessary bit usage and reduced coding efficiency.

Innovation Solution

Ensuring that a picture header network abstraction layer unit precedes a first video coding layer unit in a picture unit, eliminating the need to signal a picture header identifier, thereby establishing the association between the header and slices of a picture, which reduces bitstream size and improves coding efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a picture header identifier is signaled in the picture header NAL unit, then the association between the picture header and slices of the picture is explicitly established, but the bitstream size increases and coding efficiency decreases

Engineering Contradiction:

Improvepicture header associationVSAvoidbitstream size

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts and removes the picture header identifier (PH ID) signaling from the picture header NAL unit. By taking out this redundant information, the patent eliminates the need for explicit PH ID signaling while maintaining the association between picture headers and slices through the structural arrangement of NAL units in the bitstream.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The picture header NAL unit and slice NAL units self-associate through their sequential arrangement in the bitstream. The decoder automatically establishes the association between a picture header and its corresponding slices based on the positional relationship and syntax structure, without requiring explicit PH ID signaling. Each slice NAL unit implicitly references the preceding picture header NAL unit.

Inventive Principle:

Principle #25Self-service

2Productivity

If a picture header identifier is removed from the bitstream, then coding efficiency is improved, but the decoder must infer picture associations without explicit signaling

Engineering Contradiction:

Improvecoding efficiencyVSAvoiddecoder inference logic

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent performs preliminary structural arrangement of NAL units in the bitstream, where the picture header NAL unit is positioned immediately before the slice NAL units. This preliminary positioning enables the decoder to automatically infer associations through syntactic analysis of the bitstream structure, eliminating the need for complex inference mechanisms while maintaining coding efficiency.

Inventive Principle:

Principle #10Preliminary action

3Quantity of substance

If the picture header NAL unit precedes the first video coding layer NAL unit, then the association between header and slices is established without PH ID, but the bitstream structure must be precisely controlled

Engineering Contradiction:

Improvebitstream sizeVSAvoidbitstream structure control

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent segments the NAL units into distinct types: picture header NAL units and video coding layer NAL units (including slice NAL units). This segmentation creates a clear structural pattern where picture header NAL units precede the VCL NAL units they describe. The segmentation enables automatic association through positional relationships while simplifying the encoder and decoder operations.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20260012650A1Signaling of Picture Header in Video Coding

Publication Date: 2026.01.08 HUAWEI TECH CO LTD

AI summary

A method of decoding is provided. The method includes receiving a video bitstream including a picture unit (PU), where the PU includes a picture header (PH) network abstraction layer (NAL) unit preceding a first video coding layer (VCL) NAL unit, and decoding a coded picture from the PU to obtain a decoded picture.