Caption Display Position Control for Aspect Ratio Mismatch
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Solution Overview
Problem
Conventional broadcasting systems face issues with caption display when the aspect ratio of the video area differs from the display area, leading to partial captions being cut off and an uncomfortable viewing experience due to inadequate resizing of caption positions.
Innovation Solution
A reception apparatus and method that includes a reception unit for decoding video and subtitle streams, with a control unit performing resize processing on caption display positions based on relative position information within a defined caption display range, ensuring proper alignment and resizing of captions to maintain their original shape and aspect ratio, even when the video and display areas have different aspect ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If caption display position is designated by relative position with respect to video area, then caption can be displayed adaptively on different displays, but part of the caption may exceed beyond the display area and not be displayed when aspect ratios differ
Solution Approach 1:
The patent changes the reference parameter for caption positioning from video area to display video area. When aspect ratios differ, the system calculates a scaled caption display position that maintains the original relative positioning while adapting to the actual display boundaries, preventing caption cutoff while preserving adaptive display capability
Solution Approach 2:
The patent introduces aspect ratio as an additional dimensional parameter in the caption positioning calculation. By considering both the relative position and the aspect ratio relationship between video area and display video area, the system determines an adjusted caption display position that accounts for the dimensional transformation
2Manufacturing precision
If caption display position is compressed solely in horizontal direction to match different aspect ratios, then caption fits within display area, but the compression gives a sense of discomfort to the viewer
Solution Approach 1:
The patent changes the scaling approach from unidirectional (horizontal only) to bidirectional (both horizontal and vertical) scaling. By proportionally compressing or expanding the caption display position in both directions based on the aspect ratio difference, the system maintains the original caption shape and aspect ratio, eliminating viewer discomfort while ensuring proper display boundaries
Data Source
AI summary
An object is to make it possible to perform caption display satisfactorily in a case where the caption display position is designated as a relative position.The video stream is decoded to obtain video data, and the subtitle stream including the caption information is decoded to obtain bitmap data of the caption. The caption display position in the caption display position information included in the caption information is designated as a relative position with respect to the caption display range. In a case where the aspect ratio of the video area is different from the aspect ratio of the display video area, the caption display position is determined with the display video area defined as the caption display range, further resize processing is performed, and the display position control is performed onto the bitmap data of the caption on the basis of the caption display position that has undergone the resize processing. Bitmap data of the caption that has undergone display position control is superimposed on the video data to obtain display video data.