Mixed NAL Unit Signaling for Flexible Slice Video Coding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images and videos, along with the rise of immersive media formats like VR and AR, necessitates a high-efficiency image and video compression technology to effectively compress and transmit or store this data, particularly in terms of improving video/image coding efficiency and signaling network abstraction layer (NAL) unit information.
Innovation Solution
A method and apparatus for improving video/image coding efficiency by determining mixed NAL unit types within a picture and allowing reference picture list information to be signaled for slices with specific NAL unit types, enabling flexible coding of leading picture NAL unit types and other non-intra random access point NAL unit types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images and videos are transmitted or stored using existing mediums, then image and video quality is improved, but transmission costs and storage costs are increased
Solution Approach 1:
The patent extracts and removes redundant information from video and image data through advanced coding techniques. By identifying and eliminating unnecessary data elements while preserving essential visual information, the system reduces the total data volume that needs to be transmitted or stored, thereby lowering costs while maintaining quality.
Solution Approach 2:
The patent employs parameter changes in the coding process to optimize compression efficiency. By dynamically adjusting coding parameters such as quantization levels, transform block sizes, and prediction modes based on content characteristics, the system achieves better compression ratios without significant quality loss, reducing transmission and storage requirements.
2Adaptability or versatility
If NAL unit type information is signaled for every slice in a picture, then coding flexibility is improved, but signaling overhead is increased
Solution Approach 1:
The patent segments the picture into multiple slices, each with its own NAL unit type characteristics. By dividing the picture into independent or semi-independent slices, the system can apply different coding strategies to different regions, improving flexibility while reducing the need to signal NAL unit type information for every single slice throughout the entire picture.
Solution Approach 2:
The patent introduces a picture-level NAL unit type parameter that applies universally across multiple slices. This multi-functional approach allows a single parameter setting to govern the NAL unit type for several slices simultaneously, reducing redundant signaling overhead while maintaining the ability to apply different types where necessary through slice-specific overrides.
Data Source
AI summary
According to the disclosure of the present document, an NAL unit type for slices in a picture may be determined on the basis of NAL unit type-related information relating to whether the picture has a mixed-NAL unit type, and a type mixed with another type of NAL unit as well as an IRAP for a picture having the mixed-NAL unit type may be provided.