Gradual Random Access Picture Signaling for Smoother Video Decoding

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Solution Overview

Problem

Existing video coding standards face challenges in efficiently managing random access points, leading to inefficiencies in video decoding processes.

Innovation Solution

The implementation of gradual random access pictures, signaled through flags in parameter sets and tile group headers, allows for improved video decoding by conditionally indicating the presence of random access information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional random access points are used in video coding, then decoding can be initiated at random access points, but decoding efficiency and smoothness are insufficient

Engineering Contradiction:

Improvedecoding efficiencyVSAvoidrandom access performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the random access picture into multiple tile groups, each with independent decoding capabilities. By dividing the picture into tile groups that can be decoded independently and signaled with individual availability flags, the system enables parallel decoding paths and improves overall decoding efficiency while maintaining random access functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent prepares reference picture availability information in advance by signaling flags in parameter sets and tile group headers before decoding occurs. This preliminary signaling of unavailable reference pictures allows the decoder to pre-configure reference picture lists and avoid runtime errors, thereby improving decoding smoothness and efficiency at random access points.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If random access pictures are implemented without optimized signaling, then random access points can be established, but decoding process becomes inefficient

Engineering Contradiction:

Improvedecoding process smoothnessVSAvoiddecoding time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent signals reference picture availability flags in advance in parameter sets and tile group headers, allowing the decoder to pre-configure reference picture lists before actual decoding. This preliminary configuration eliminates runtime uncertainties and improves decoding smoothness while reducing overall decoding time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic signaling of tile group picture unavailable reference picture flags that can be conditionally present based on picture type and random access point characteristics. This dynamic approach allows the system to adapt the level of signaling detail to the specific decoding scenario, optimizing both smoothness and efficiency.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12501078B2Systems and methods for signaling types of pictures and associated information in video coding

Publication Date: 2025.12.16 SHARP KK

AI summary

This disclosure relates to video coding and more particularly to techniques for signaling types of pictures for coded video. In particular, this dis-closure describes techniques for enabling and signaling a so-called gradual random access picture. According to an aspect of an invention, a second syntax element is decoded by using a value of a first syntax element wherein the first syntax element indicates a picture is a random access picture having a recovery point picture and the second syntax element specifies a first picture order count value of the recovery point picture.