Output Layer Set Mode Indicator in Video Parameter Set
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Solution Overview
Problem
Current video compression technologies face challenges in efficiently signaling adaptive picture size changes within a video bitstream, particularly in next-generation codecs like Versatile Video Coding (VVC, which requires improved methods for managing multiple layers and scalabilities.
Innovation Solution
The proposed solution involves signaling adaptive picture size through a video parameter set (VPS) using an output layer set mode indicator, allowing for explicit signaling of picture output layers, and controlling a display to show only the decoded output layers, enabling efficient decoding and display of adaptive resolution changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all layers in the bitstream are decoded and output, then complete video information is preserved, but bandwidth and storage requirements increase
Solution Approach 1:
The patent extracts and outputs only the necessary picture layers from the multi-layer bitstream based on the output layer set mode indicator. Instead of decoding and outputting all layers, the system selectively extracts only the required layers (e.g., only base layer or only enhancement layer), thereby reducing bandwidth and storage requirements while maintaining the essential video information for the intended application.
2Productivity
If adaptive picture size signaling is implemented in VVC, then compression efficiency is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter representation by using an output layer set mode indicator that directly specifies which layers should be output. This parameter change simplifies the signaling structure compared to traditional methods, allowing the decoder to efficiently determine which layers to process without complex signaling overhead, thereby improving compression efficiency while maintaining manageable device complexity.
3Adaptability or versatility
If explicit signaling of output layer sets is added to VPS, then decoding flexibility is improved, but bitstream overhead increases
Solution Approach 1:
The patent applies partial signaling by only explicitly indicating the output layer set mode when needed, rather than signaling all possible layer configurations. The output layer set mode indicator provides just enough information to enable flexible decoding decisions, avoiding excessive bitstream overhead while maintaining the necessary adaptability for different decoding scenarios.
Data Source
AI summary
A method of decoding may comprise: receiving a bitstream comprising compressed video/image data; parsing or deriving, from the bitstream, an output layer set mode indicator in a video parameter set (VPS); identifying output layer set signaling based on the output layer set mode indicator; identifying one or more picture output layers based on the identified output layer set signaling; and decoding the identified one or more picture output layers.