Dependent Random Access Picture Decoding with GDR Reference Frames
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the increased amount of transmitted information, necessitating high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method and apparatus that utilizes a dependent random access point picture, specifically a gradual decoding refresh (GDR) picture with a zero recovery point, to enhance encoding/decoding efficiency, enabling improved random access and bitstream management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image data is transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent segments the bitstream into multiple segments with different priority levels. High-priority segments contain essential image data for basic reconstruction, while low-priority segments contain additional detail information. This allows receivers to transmit or store only high-priority segments for basic functionality, reducing transmission/storage costs, while enabling high-quality reconstruction when all segments are available.
Solution Approach 2:
The patent changes the parameter of data priority classification by assigning different priority levels to different image data segments. This parameter change enables flexible transmission strategies where the amount of data transmitted can be adjusted based on available bandwidth and storage resources, while maintaining the ability to reconstruct images at different quality levels.
2Ease of operation
If random access to picture data is enabled, then access flexibility is improved, but decoding complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-classifying image data into priority segments and pre-establishing segment headers with identification information during the encoding phase. This preliminary organization allows receivers to quickly locate and access specific picture segments without complex real-time analysis, reducing decoding complexity while maintaining random access flexibility.
Solution Approach 2:
The patent introduces segment headers as intermediary elements that contain identification information and metadata for each picture segment. These headers act as mediators between the encoded image data and the decoder, enabling the system to quickly identify and access specific segments without complex searching or analysis, thus simplifying the random access process.
Data Source
AI summary
A method and a device for image encoding/decoding are provided. An image decoding method according to the present disclosure may comprise the steps of: in response to a random-access request for a first picture, acquiring a second picture which is associated with the first picture and has been decoded before the first picture; and decoding the first picture by referring to the second picture, wherein the first picture is a dependent random-access point picture, and the second picture is gradual coding refresh (GDR) picture having a zero-recovery point picture.