Blu-ray Disc Graphics Overlay for Seamless Playback
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Solution Overview
Problem
Conventional consumer playback apparatuses require high bandwidth to present interactive menu effects without interrupting AV playback, making it impractical for widespread use due to the need for simultaneous video and graphics data transfer.
Innovation Solution
A recording medium with a video stream and a graphics stream that includes interactive control information and graphics data, allowing for seamless playback by overlaying menu effects on the video image without interrupting AV playback, using a fixed transfer rate capable playback apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in-effect and out-effect are overlaid onto the video image to avoid interrupting AV playback, then seamless playback is achieved, but the playback apparatus requires large bandwidth to simultaneously transfer video stream and graphics data
Solution Approach 1:
The patent segments the effect presentation into multiple display compositions that are pre-defined in the graphics stream. Instead of requiring high-bandwidth real-time graphics rendering, the effect is divided into discrete composition frames that can be transferred at a fixed, lower rate and assembled by the playback apparatus to reconstruct the animated effect sequences.
2Ease of manufacture
If conventional disc contents interrupt AV playback to present menu effects, then the effects can be presented clearly, but user experience deteriorates due to repeated interruptions
Solution Approach 1:
The patent implements continuity of useful action by maintaining uninterrupted AV playback while presenting menu effects. The video stream continues playing without interruption, and the menu effects are overlaid as graphics that are rendered and displayed concurrently with the video content, ensuring both the video playback and effect presentation proceed continuously without interruption.
3Reliability
If high-bandwidth playback apparatus is used to present effects without interrupting AV playback, then seamless playback with effects is achieved, but device complexity and cost increase making it impractical for widespread use
Solution Approach 1:
The patent changes the parameter of graphics data transfer from high-bandwidth real-time transfer to fixed-rate sequential transfer. By defining display compositions with specific parameters (bounding area, duration, replacement timing) in advance, the system enables effect presentation at a manageable fixed transfer rate that standard consumer playback apparatus can handle without requiring high-bandwidth capabilities.
Data Source
AI summary
A BD-ROM stores a video stream and a graphics stream. The video stream represents a moving picture. The graphics stream is used for overlaying one or more menus on the moving picture, and includes interactive control information (ICS) and a plurality of pieces of graphics data (ODSs). The graphics data is used to generate both the menus and an effect for introduction or removal of a menu. The interactive control information includes (i) a reference value (window_id_ref) specifying a window within which each display composition of graphics is rendered for presenting the effect and (ii) information (effect_duration) showing a duration after which a display composition is replaced by a subsequent display composition.