3D Video Metadata Offset Control for Graphics Alignment
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Solution Overview
Problem
Conventional 3D video technology struggles to maintain high-quality playback of graphics images when storing 3D video content, particularly due to asynchronous processing of graphics streams and offset information, leading to misalignment of fields of vision and increased memory requirements.
Innovation Solution
A recording medium that includes a main-view video stream, a sub-view video stream, and a graphics stream, with metadata providing offset information and identifiers to control the generation of paired graphics planes, allowing for improved correspondence and alignment of graphics images during playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If graphics streams and offset information are processed asynchronously, then processing flexibility is improved, but alignment precision of graphics planes deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-organizing offset information into metadata structures that are synchronized with graphics stream timestamps. Offset information is prepared and associated with corresponding graphics data before playback, ensuring that when graphics planes are generated, the alignment data is already ready and properly timed. This resolves the contradiction by maintaining processing flexibility through asynchronous file structures while achieving alignment precision through pre-synchronized metadata.
2Adaptability or versatility
If separate files are used for graphics stream and offset information, then file organization flexibility is improved, but memory requirements increase
Solution Approach 1:
The patent merges graphics stream data and offset information into a unified metadata structure that associates both types of data through synchronized timestamps and sequence numbers. Instead of loading separate files into memory, the system combines them into a single coordinated data structure that can be processed together. This reduces memory requirements by eliminating redundant file structures while maintaining the organizational flexibility of having distinct data types properly associated through the metadata linkage.
3Device complexity
If offset information is stored separately from graphics stream, then data structure simplicity is improved, but correspondence accuracy deteriorates
Solution Approach 1:
The patent introduces metadata as an intermediary structure that bridges graphics stream data and offset information. The metadata contains synchronized timestamps, sequence numbers, and association identifiers that link offset information to the corresponding graphics frames. This intermediary layer maintains data structure simplicity by using standardized metadata containers while achieving high correspondence accuracy through precise temporal and sequential linking mechanisms that ensure each offset value is correctly associated with its corresponding graphics data.
Data Source
AI summary
A main-view and sub-view video stream pair, a graphics stream, and playlist information are recorded on a BD-ROM disc. In the sub-view video stream, metadata is provided in each GOP. The metadata includes a correspondence table associating offset identifiers and offset information. The offset information defines offset control for each picture in a GOP. Offset control is processing to provide a left offset and right offset for the horizontal coordinates in a graphics plane to generate a pair of graphics planes that are respectively combined with main-view and sub-view video planes. The playlist information includes a stream selection table for each playback section. When the stream selection table associates a stream number with a packet identifier of a graphics stream, one of the offset identifiers is allocated to the stream number.


