Subpicture Header Signaling for Lower Bitstream Overhead
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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 or bits, necessitating high-efficient image compression technology.
Innovation Solution
An image encoding/decoding method that efficiently signals information on subpictures and picture headers through flags, allowing for improved encoding/decoding efficiency by managing the presence of picture header information in slice headers and network abstraction layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The image data is divided into multiple subpictures, allowing selective encoding and transmission of different regions. This segmentation enables efficient resource allocation where high-quality encoding is applied only to important regions while reducing bitrate for less critical areas, thereby maintaining overall image quality while reducing total transmission and storage costs.
Solution Approach 2:
Different quality levels and encoding parameters are applied to different subpictures based on their importance and content characteristics. Critical regions receive higher quality encoding with more bits, while non-critical regions use lower quality encoding, achieving a balance between overall image quality and transmission cost efficiency.
2Measurement precision
If subpicture information is signaled in the bitstream, then decoding accuracy is improved, but bitstream complexity increases
Solution Approach 1:
Subpicture information including boundaries and identifiers is pre-signaled in the bitstream before the actual image data. This preliminary signaling allows the decoder to properly organize and process the segmented data, ensuring accurate reconstruction while using efficient syntax elements that minimize the overhead complexity.
Solution Approach 2:
Picture header information acts as an intermediary that carries subpicture configuration data. By placing subpicture signaling information in the picture header rather than repeatedly in each slice or block, the patent reduces bitstream complexity while ensuring decoding accuracy through centralized, efficient information delivery.
3Productivity
If picture header information is included in slice header, then decoding efficiency is improved, but header overhead increases
Solution Approach 1:
The picture header structure is designed to serve multiple functions: it contains both traditional picture-level parameters and subpicture-specific information. This multi-functional header reduces the need for separate signaling structures, improving decoding efficiency by consolidating information while managing overhead through shared syntax elements across different header levels.
Data Source
AI summary
Disclosed herein are an image encoding and decoding method and apparatus for signaling information on a subpicture and picture header, and a method of transmitting a bitstream. The image decoding method according to the present disclosure may include acquiring a first flag specifying whether information on a subpicture is present in a bitstream, acquiring a second flag specifying whether picture header information is present in a slice header, and decoding the bitstream based on the first flag and the second flag. When the first flag specifies that the information on the subpicture is present in the bitstream, the second flag may have a value specifying that the picture header information is not present in the slice header.