Video Bitstream Random Access Without Intra Pictures

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Solution Overview

Problem

Existing video encoding/decoding methods require intra pictures for random access, leading to increased bit rates and inefficiencies.

Innovation Solution

A method for encoding/decoding pictures in a random access group by gradually expanding the reconstructed region, allowing random access without intra pictures, using P-type prediction and explicit signaling of intra regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If intra pictures are used for random access, then random access capability is achieved, but bit rate increases

Engineering Contradiction:

Improverandom access capabilityVSAvoidbit rate

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The picture is divided into multiple regions (first region and second region) with different reconstruction characteristics. The first region is completely reconstructed while the second region is partially reconstructed, allowing selective reconstruction based on importance without requiring a full intra picture for random access.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the picture are assigned different reconstruction qualities. The first region (e.g., header or important content area) receives complete reconstruction with full data, while the second region receives partial reconstruction with reduced data, optimizing the balance between random access capability and bit rate.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If complete reconstruction of all regions is performed, then reconstruction accuracy is improved, but encoding complexity and time increase

Engineering Contradiction:

Improvereconstruction accuracyVSAvoidencoding speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

Instead of completely reconstructing all regions, the method performs partial reconstruction only on the first region that requires high accuracy. The second region is reconstructed with lower accuracy using fewer resources, achieving acceptable overall quality while significantly reducing encoding complexity and time.

Inventive Principle:

Principle #16Partial or excessive action

3Manufacturing precision

If all regions are completely coded, then picture quality is maintained, but transmission and storage costs increase

Engineering Contradiction:

Improvepicture qualityVSAvoidtransmission and storage costs

Core Design Contradiction:

Manufacturing precisionVSLoss of energy

Solution Approach 1:

The picture is divided into regions with different quality requirements. The first region is completely coded to maintain high picture quality where it matters most, while the second region uses compressed or partial coding to reduce data volume, thereby lowering transmission and storage costs while preserving acceptable overall quality.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12604011B2Video signal encoding/decoding method, and recording medium in which bitstream is stored

Publication Date: 2026.04.14 KT CORP

AI summary

An image decoding method according to the present disclosure comprises the steps of: when a random access: is performed, sequentially decoding pictures belonging to a random access group; and outputting, as a reconstructed picture, a last picture from among the pictures belonging to the random access group.