Reference Picture List Selection for Determinable Video Prediction

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Solution Overview

Problem

The method described in NPL 1 has inadequacies in its syntax and semantics defining reference picture lists, leading to indeterminable reference picture lists when two lists are selected with one index value, depending on the number of two reference picture list structures.

Innovation Solution

A video decoding apparatus and a video coding apparatus that include a prediction unit capable of decoding and coding a reference picture list structure with multiple lists, allowing selection of two reference picture lists for each picture or slice using one index value based on the number of structures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple reference picture lists are registered and selected using one index value, then coding efficiency is improved, but the reference picture lists become indeterminable depending on the number of structures

Engineering Contradiction:

Improvecoding efficiencyVSAvoiddeterminability of reference picture lists

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the reference picture list selection process into two distinct stages: first selecting a reference picture list structure from multiple candidate structures, then selecting the actual reference picture list from the chosen structure. This segmentation resolves the indeterminability problem by creating a hierarchical selection process where each stage has its own dedicated index, ensuring that the final reference picture list is always determinable even when multiple structures are available.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the syntax and semantics for reference picture lists are simplified, then ease of operation is improved, but the ability to handle multiple list structures is reduced

Engineering Contradiction:

Improvesyntax simplicityVSAvoidhandling of multiple reference picture list structures

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent introduces a new dimension to the reference picture list selection by adding a structure selection layer before the traditional list selection. Instead of directly selecting from multiple list structures with a single index, the system first selects a structure (adding a structural dimension) and then selects a list within that structure. This dimensional expansion maintains syntax simplicity while enabling versatile handling of multiple reference picture list structures.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12563182B2Video coding apparatus and video decoding apparatus

Publication Date: 2026.02.24 SHARP KK

AI summary

In a case that two reference picture lists are selected with one index value, the reference picture lists may not be determinable depending on the number of two reference picture list structures. Provided is a prediction unit that decodes a reference picture list structure including multiple reference picture lists and selects two reference picture lists from the reference picture list structure for each picture or for each slice. The prediction unit selects two reference picture lists with one index value depending on the number of two reference picture list structures.