VVC Image Items With Layer Constraints and GDR Recovery Points
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Solution Overview
Problem
The existing VVC image file format lacks interoperability points for image items containing multiple layers, allows access units with inter-coded pictures, and does not support multiple transition effects, leading to suboptimal user experience and decoding issues.
Innovation Solution
Define new file brands and item types for VVC bitstreams to ensure intra-coded access units, restrict layers to target output sets, allow multiple transition effects, and clarify syntax elements for improved interoperability and decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the VVC image file format allows access units with inter-coded pictures, then the format provides more flexibility in picture coding, but it causes decoding issues and reduces reliability
Solution Approach 1:
The patent extracts and removes inter-coded pictures from the image item, allowing only intra-coded pictures to remain. This is achieved by setting the inter_pic_flag to indicate that only intra-coded pictures are present, effectively taking out the problematic inter-coded content while preserving the necessary intra-coded information for reliable decoding
Solution Approach 2:
The patent changes the parameter state of the access unit by setting inter_pic_flag to a specific value that indicates only intra-coded pictures are present. This parameter change transforms the access unit from potentially containing both intra and inter coded pictures to containing only intra-coded pictures, ensuring decoding reliability
2Adaptability or versatility
If the VVC image file format does not restrict layers to target output sets, then the format allows more layer configurations, but it reduces interoperability
Solution Approach 1:
The patent applies local quality control by restricting layers to only those in the target output layer set. Each image item is evaluated individually to determine which layers should be included based on the target output set, ensuring that only compatible layers are present while maintaining the necessary quality and interoperability
Solution Approach 2:
The patent changes the layer inclusion parameter by comparing each layer against the target output layer set. Layers are included or excluded based on whether they belong to the target set, transforming the layer configuration from an unrestricted state to a controlled state that ensures interoperability
3Device complexity
If the VVC image file format does not support multiple transition effects, then the format maintains simplicity, but it reduces user experience quality
Solution Approach 1:
The patent implements multi-functionality by allowing multiple transition effects to be applied to image items. The image item structure is enhanced to support various transition effect types while maintaining a unified processing framework, enabling the format to handle multiple effects without proportionally increasing complexity
Solution Approach 2:
The patent segments the transition effect processing by introducing a transition effect property structure that can contain multiple effect definitions. Each effect is processed as a separate entity within the overall transition framework, allowing multiple effects to be managed independently while maintaining system simplicity
Data Source
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AI summary
Systems, methods and apparatus for processing image data are described. One example method includes performing a conversion between a visual media file and a bitstream. The visual media file comprises a sequence of one or more pictures according to a media file format, and the bitstream comprises one or more access units according to a video coding format. The bitstream is coded according to the video coding format. The media file format specifies that an image item of a specific type value in the visual media file includes a single access unit of the bitstream. The single access unit is either an Intra Random Access Picture (IRAP) access unit or a Gradual Decoding Refresh (GDR) access unit according to the video coding format. All pictures in the GDR access unit are identified as a recovery point in the bitstream.