Subpicture Signaling in Video Coding Syntax Elements
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Solution Overview
Problem
Video decoders face challenges in determining how to handle and extract subpictures from original pictures, leading to potential erroneous decoding and a poor user experience due to inadequate signaling of syntax elements in existing video coding standards.
Innovation Solution
The proposed solution involves determining and signaling syntax elements, such as the number of subpictures and their identification, within sequence parameter sets (SPS), picture parameter sets (PPS), and slice headers, allowing video decoders to correctly parse and handle subpictures, thereby improving subpicture extraction and decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If subpicture signaling is not provided in video coding standards, then video coding complexity is reduced, but video decoder reliability deteriorates because decoders cannot determine how to identify and handle subpictures
Solution Approach 1:
The patent applies preliminary action by defining subpicture signaling syntax elements in advance within the video coding standard structure. Sequence parameter sets, picture parameter sets, and slice headers are pre-configured with subpicture identification syntax elements, enabling decoders to reliably identify and handle subpictures before actual decoding occurs, thus improving decoder reliability without adding runtime complexity
2Measurement precision
If subpicture identification syntax elements are added to video coding standards, then subpicture extraction accuracy is improved, but information transmission overhead increases
Solution Approach 1:
The patent applies local quality by strategically placing subpicture identification syntax elements only in specific locations within the bitstream structure—namely in sequence parameter sets, picture parameter sets, and slice headers—rather than uniformly throughout. This localized approach provides precise subpicture identification where needed while minimizing overall information overhead in the bitstream
Data Source
AI summary
An example device includes a memory and one or more processors implemented in circuitry and communicatively coupled to the memory. The one or more processors are configured to determine a value of a first syntax element indicative of a number of subpictures in a picture of video data. The one or more processors are configured to determine, for each subpicture among the subpictures in the picture, a value of a respective second syntax element indicative of an identification of a respective subpicture. The one or more processors are also configured to code the respective subpicture identified by the respective second syntax element.