Display Overlay Layering for Composite Video Coding
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Solution Overview
Problem
Existing video coding technologies do not effectively handle display overlays, particularly in layered structures with different frame rates and alpha components, leading to inefficiencies in forming composite display pictures.
Innovation Solution
A method and apparatus for video coding that defines and signals display overlay information messages with metadata to enable multiple overlays in layers within a bitstream, allowing for the formation of composite display pictures by specifying the order and applying alpha components to form new pixel values, while handling different frame rates and resolutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple display overlays are coded in separate layers within a bitstream, then display quality and flexibility are improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent segments display overlays into separate coded layers within the bitstream, allowing independent encoding and processing of each overlay layer. This enables flexible composition of multiple overlays while maintaining manageable complexity through modular structure.
Solution Approach 2:
The patent introduces a new dimension to video coding by adding overlay layer identifiers and composition metadata to the traditional single-layer bitstream structure. This dimensional extension allows multiple overlays to be coded and composed without fundamentally redesigning the entire coding system.
2Manufacturing precision
If alpha components are applied to form new pixel values in composite display pictures, then display quality is improved, but processing time and computational requirements increase
Solution Approach 1:
The patent performs preliminary actions by pre-computing and storing alpha component data and overlay composition metadata during the encoding phase. This allows the decoding and composition process to proceed more efficiently by utilizing pre-prepared data structures rather than computing everything in real-time.
3Ease of operation
If display overlay information messages with metadata are signaled in the bitstream, then overlay composition control is improved, but bitstream size and transmission data increase
Solution Approach 1:
The patent employs parameter changes by using compact metadata structures and efficient syntax elements to encode overlay composition information. By optimizing the representation of overlay parameters (such as using differential encoding and compact data types), the patent reduces the bitstream overhead while maintaining comprehensive control capabilities.
Data Source
AI summary
Various embodiments provide methods, apparatuses, and computer program products. An example apparatus includes: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: defining a display overlay information message comprising metadata for enabling two or more display overlays to be coded in pictures in one or more layers within a bitstream; and signaling, in or along the bitstream, the display overlay information message to a receiver.