Subtitle Positioning and Font Handling in Video Transmission
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Solution Overview
Problem
In broadcasting, subtitle display issues arise when the aspect ratio of the video area differs from the display area, leading to partial subtitles being cut off, and font specification problems occur if the required font is not mounted on the reception side, resulting in discomfort and incomplete subtitle display.
Innovation Solution
A transmission device that sends a container with video and subtitle streams, including subtitle display position information and auxiliary information for resizing and font download, allowing for accurate subtitle positioning and font acquisition, ensuring complete and comfortable subtitle display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If subtitle display position is specified as relative position with respect to video area, then subtitle positioning is simplified, but subtitle may stick out of display area when aspect ratios differ
Solution Approach 1:
The patent applies preliminary action by inserting auxiliary information including display area aspect ratio and subtitle display range into the subtitle stream before transmission. This allows the reception device to pre-calculate the correct subtitle display position by comparing video area aspect ratio with display area aspect ratio, preventing subtitle cutoff before display occurs.
2Manufacturing precision
If font specification information is transmitted in subtitle text information, then subtitle font can be precisely controlled, but subtitle display fails if font file is not mounted on reception side
Solution Approach 1:
The patent uses an intermediary approach by introducing a font file distribution mechanism. The auxiliary information includes font file identification and distribution location, acting as a mediator between the subtitle stream and the required font files. This allows the reception device to automatically acquire missing font files from specified locations, ensuring subtitle display reliability without compromising font specification precision.
3Reliability
If auxiliary information is inserted into subtitle stream, then subtitle display completeness is improved, but data transmission volume increases
Solution Approach 1:
The patent applies the taking out principle by extracting essential auxiliary information (display area aspect ratio, subtitle display range, font file identification) from the bulky font files themselves. Only the necessary metadata is inserted into the subtitle stream, while the actual font files are distributed separately through efficient channels, minimizing the increase in subtitle stream data volume while ensuring subtitle display completeness.
Data Source
AI summary
It becomes possible to satisfactorily perform subtitle display in the reception side.A container of a predetermined format is transmitted, the container including a video stream including video data and a subtitle stream including text information of a subtitle, the text information including subtitle display position information for specifying a subtitle display position as a relative position with respect to a subtitle display range. Auxiliary information is inserted, into a container of the subtitle stream, to be used when the subtitles is displayed by using subtitle position information. For example, the auxiliary information is information regarding resizing processing, information for determining a subtitle display range, and the like.