Reference Picture List Signaling with First-Occurrence Adjustment

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Solution Overview

Problem

Existing video coding standards face challenges in efficiently signaling reference picture list entry information, which affects the decoding process and compression efficiency.

Innovation Solution

A method is introduced to signal a syntax element specifying an absolute delta picture order count for a short-term reference picture, adjusting the value when it is the first occurring picture in the list, to enhance decoding accuracy and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the syntax element directly specifies the absolute delta picture order count for short term reference pictures, then the decoding process becomes simpler, but the bitstream size increases and compression efficiency decreases

Engineering Contradiction:

Improvedecoding process simplicityVSAvoidcompression efficiency

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The patent changes the parameter representation from absolute delta picture order count to a flag-based indicator that specifies whether the current picture is the first occurring short term reference picture. This parameter transformation reduces the bitstream size by eliminating redundant information while maintaining decoding simplicity through clear conditional logic.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extracts the essential information needed for reference picture list management by separating the first occurring picture identification from the general reference picture signaling. This extraction allows efficient bitstream representation by only signaling the special first occurring case when necessary, reducing overall bitstream size while maintaining full functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

2Loss of energy

If the syntax element specifies the absolute delta picture order count without adjustment for first occurring pictures, then the bitstream remains compact, but the decoding accuracy for reference picture lists decreases

Engineering Contradiction:

Improvebitstream sizeVSAvoiddecoding accuracy

Core Design Contradiction:

Loss of energyVSMeasurement precision

Solution Approach 1:

The patent implements feedback through the adjusted syntax element that explicitly indicates whether the current picture is the first occurring short term reference picture. This feedback mechanism ensures accurate reference picture list construction by providing precise information about picture occurrence status, which is critical for correct decoding while maintaining compact bitstream representation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs preliminary action by pre-establishing the reference picture list structure and pre-identifying the first occurring short term reference picture through the adjusted syntax element. This preliminary identification ensures accurate decoding from the beginning, establishing the correct reference picture list before subsequent processing occurs.

Inventive Principle:

Principle #10Preliminary action

3Measurement precision

If the syntax element uses adjusted values for first occurring short term reference pictures, then the reference picture list accuracy improves, but the processing complexity increases

Engineering Contradiction:

Improvereference picture list accuracyVSAvoidprocessing complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by treating the first occurring short term reference picture case differently from other reference pictures. The adjusted syntax element provides specialized handling only for the first occurring case, while other reference pictures follow the standard signaling mechanism. This localized differentiation improves accuracy without unnecessarily complicating the overall processing for all cases.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250330567A1Systems and methods for signaling reference picture list entry information in video coding

Publication Date: 2025.10.23 SHARP KK

AI summary

This disclosure relates to video coding and more particularly to techniques for signaling reference picture list entry information for coded video. In one example, a method of signaling reference picture list entry information (ref_pic_list_struct( )) for video data comprises signaling a syntax element (abs_delta_poc_st) specifying a value for a variable specifying an absolute delta picture order count for a short term reference picture, wherein the signaled value plus one specifies the value for variable in a case that a corresponding short term reference picture is a first occurring short term reference picture in a reference picture list.