Subtitle Region Scaling for Screen Adaptability
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Solution Overview
Problem
Conventional subtitle transmission methods rely on video resolution precision, making it difficult to adjust the position and size of subtitles based on the viewer's screen size or viewing position, limiting adaptability in display.
Innovation Solution
The system inserts information on allowable size and position correction ranges into the subtitle stream, allowing the reception device to automatically or user-actively adjust subtitle size and position based on viewing position and monitor size, using TTML structures and region scaling segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If subtitles are transmitted with precision dependent on video resolution, then the subtitle display position and size can be determined, but the adaptability to different screen sizes and viewing positions is limited
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple subtitle display regions with different sizes and positions in the transmitted subtitle data. These regions are prepared in advance according to different screen sizes and viewing positions, allowing the reception device to select and apply the appropriate region without requiring complex real-time correction mechanisms. This resolves the contradiction by providing adaptability through pre-prepared options while keeping the device complexity low.
Solution Approach 2:
The patent employs parameter changes by varying the display region parameters (position and size) based on the detected screen size and viewing position. The system transmits multiple subtitle regions with different parameters and selects the appropriate one according to the playback environment. This allows the subtitle display to adapt to different conditions without adding complex correction mechanisms to the device.
2Ease of operation
If automatic correction of subtitle size and position is implemented, then the ease of operation is improved, but the device complexity increases due to detection and processing requirements
Solution Approach 1:
The patent applies self-service by enabling the subtitle display system to automatically detect its own playback environment (screen size, viewing position) and autonomously select and adjust the appropriate subtitle region without user intervention. The reception device performs automatic detection and correction, making the system self-sufficient and improving ease of operation while avoiding the need for complex user-configurable correction mechanisms.
Solution Approach 2:
The system implements feedback by detecting the actual playback environment (screen size, viewing position) and using this information to automatically select and adjust the subtitle display region. The detection unit provides feedback about the playback conditions to the correction unit, which then adjusts the subtitle display accordingly. This closed-loop feedback mechanism improves ease of operation by eliminating manual adjustment while keeping the device complexity manageable through standardized detection and correction processes.
Data Source
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AI summary
To enable subtitles (graphics) to be favorably superimposed and displayed on video. A container in a predetermined format is received, the container including a video stream having video data and a subtitle stream having subtitle data. The video stream is decoded to acquire the video data. The subtitle stream is decoded to acquire bitmap data of subtitles. Processing of correcting at least one of a size of the subtitles and a display position of the subtitles, is performed to the bitmap data of the subtitles. The bitmap data of the subtitles to which the processing has been performed, is superimposed on the video data to acquire display video data.