Subpicture Alignment Across Layers for Efficient Image Decoding
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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 rise in the amount of transmitted information or bits, necessitating high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method and apparatus that utilizes subpicture information aligned between layers, including a first flag to specify whether each subpicture is treated as a picture, and generates a bitstream based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image resolution and quality are improved to meet increasing demand for high-definition and ultra-high-definition images, then image quality is improved, but transmission cost and storage cost increase due to the rise in the amount of transmitted information or bits
Solution Approach 1:
The picture is divided into multiple subpictures, allowing independent processing and encoding of different regions. This segmentation enables selective encoding strategies where different subpictures can use different compression parameters, achieving a balance between image quality and data volume by focusing resources on important regions while compressing less critical areas more aggressively
Solution Approach 2:
Different subpictures within the same picture can have different quality levels and encoding parameters. The subpic_treated_as_pic_flag allows certain subpictures to be treated as independent pictures with higher quality requirements, while others can be compressed more aggressively, achieving local optimization of the quality-to-size ratio
2Productivity
If subpicture information is aligned between layers with consistent subpic_treated_as_pic_flag values, then encoding efficiency is improved, but flexibility in handling different subpicture types is reduced
Solution Approach 1:
The subpic_treatedAsPicFlag alignment mechanism serves multiple functions: it enables efficient inter-layer prediction by ensuring consistent subpicture boundaries across layers, facilitates scalable video coding by maintaining structural coherence, and allows flexible extraction of substreams by providing a standardized subpicture organization that can be independently processed at different quality levels
Data Source
AI summary
Provided is an image encoding/decoding method and apparatus. The image decoding method comprises obtaining subpicture information from a bitstream, deriving one or more subpictures in a current picture based on the subpicture information, and decoding a current subpicture in the current picture based on the subpicture information. The subpicture information may comprise a first flag specifying whether each of the one or more subpictures is treated as a picture, and, based on the bitstream including at least one first layer referring to a current layer including the current picture, the first flag for the first subpicture included in a first layer and corresponding to the current subpicture, and the first flag for the current subpicture have the same value.