3D Caption Converting Information for Digital Broadcasting
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Solution Overview
Problem
Current digital broadcast systems lack the capability to effectively generate and reproduce 3D captions from 2D caption data, failing to provide a seamless and natural 3D viewing experience due to rapid changes in caption depth and overlapping windows.
Innovation Solution
A method and apparatus for generating and receiving a digital broadcasting bitstream that includes 3D caption information by converting 2D caption data, using 3D caption converting information such as offset and size adjustments, to ensure smooth reproduction of 3D captions, with the ability to prioritize and position captions naturally on a video screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 2D caption data is directly reproduced in 3D format without conversion information, then the caption can be displayed, but the 3D viewing experience is degraded due to rapid changes in caption depth and unnatural positioning
Solution Approach 1:
The system performs preliminary conversion of 2D caption data into 3D caption data during the broadcasting signal generation phase. Conversion information including depth values, offset values, and size adjustment ratios are pre-calculated and embedded in the broadcast signal, allowing the receiver to reproduce natural 3D captions without performing complex real-time conversions.
Solution Approach 2:
Conversion information acts as an intermediary between 2D caption data and 3D caption reproduction. This intermediate data structure includes depth information, offset values, and size ratios that bridge the gap between 2D source material and 3D display requirements, enabling smooth transformation without direct complex processing at the receiver端.
2Adaptability or versatility
If caption depth changes rapidly to follow video content dynamics, then the caption can adapt to video changes, but the 3D viewing experience deteriorates due to unnatural rapid depth transitions
Solution Approach 1:
The system dynamically adjusts caption depth, size, and position based on video content characteristics while maintaining smooth transitions. The conversion information includes frame-by-frame depth values and offset adjustments that adapt to video dynamics without causing abrupt changes, achieving both adaptability and naturalness through controlled dynamic modification.
3Quantity of substance
If multiple caption windows are displayed simultaneously in 3D, then information coverage is improved, but visual confusion increases due to overlapping windows with unclear reproduction priorities
Solution Approach 1:
The system assigns different depth values, offset values, and size ratios to different caption windows based on their importance and position. Each caption window receives customized conversion information that optimizes its 3D presentation, allowing multiple captions to coexist with clear visual hierarchy and distinct spatial positioning, preventing confusion while maintaining comprehensive information coverage.
Data Source
AI summary
A method of generating a broadcasting bitstream for a digital caption broadcast, the method including: receiving video data in which a video including at least one of a two-dimensional (2D) video and a three-dimensional (3D) video is encoded; determining caption data for reproduction in conjunction with the video, and 3D caption converting information including information relating to a converting speed of an offset for reproducing the caption data as a 3D caption; and outputting a bitstream for a digital broadcast by multiplexing the received video data, the determined caption data, and the determined 3D caption converting information.