Text Subtitle Data Structure for Flexible Display Control
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Solution Overview
Problem
Current methods for managing text subtitle data on high-density optical disks, such as Blu-ray Discs, are inefficient as they require large amounts of image data to display subtitles and do not allow for changes in character attributes like font and size, limiting flexibility in display control.
Innovation Solution
A data structure is introduced that includes a subtitle area with text subtitle streams containing global and local style information, allowing for composition, rendering, and font control of text subtitle data, enabling flexible display management by separating display control information from the text data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If text subtitle data is recorded as image data (e.g., BMP data), then the subtitle can be displayed on the optical disk, but the character attributes (font, size) cannot be changed and a large amount of image data is required
Solution Approach 1:
The subtitle data is segmented into separate components: text content data and style information data. The text content is stored in a text file while style information (font, size, color, position) is stored separately in a style information file. This segmentation allows the text data to remain compact while enabling flexible styling through the separate style file.
Solution Approach 2:
Style information is extracted from the traditional image-based subtitle format and separated into independent style information data. This extracted style data is stored in a dedicated style information file, allowing it to be modified independently from the text content without requiring large image data storage.
2Adaptability or versatility
If text subtitle data is recorded as image data, then display is possible, but character attributes cannot be changed dynamically
Solution Approach 1:
The data structure is segmented into distinct files: text content files and style information files. This segmentation creates a clear separation between content and presentation, simplifying the management of display attributes while maintaining data organization.
Solution Approach 2:
The style information file serves multiple functions: it stores font information, size, color, position, and other display attributes that can be applied to text content. This universal style file can control various aspects of subtitle display through a single data structure.
3Reliability
If large amounts of image data are used for subtitles, then display quality is maintained, but storage space is consumed and management becomes difficult
Solution Approach 1:
Instead of storing large image data for each subtitle, the system uses text content that can be rendered into images during playback. The text content files store only the essential character information, which is then copied and rendered with style information to create the final displayed subtitle, significantly reducing storage requirements while maintaining display quality.
Data Source
AI summary
In the a data structure, a subtitle area of the recording medium stores a text subtitle stream including text subtitle data and at least one of global style information and local style information. The global style information provides at least one of composition information and rendering information, and the local style information provides font information for at least a portion of the text subtitle data.