Dynamic Subtitle Parallax Adjustment in VR Video Rendering
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Solution Overview
Problem
Conventional subtitle-embedding methods for VR videos fail to dynamically adjust subtitle depth relative to objects, leading to discomfort and unclear visual clarity due to fixed subtitle depth, which can make subtitles appear behind objects.
Innovation Solution
An electronic device and method that analyze the object parallax in VR videos and adjust subtitle parallax to be greater than the object parallax, ensuring the subtitle is rendered in front of objects, with options to adjust subtitle placement and size to prevent overlap and maintain clear visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional fixed subtitle depth method is used, then the subtitle embedding process is simple, but the subtitle may appear behind objects causing visual discomfort and unclear visibility
Solution Approach 1:
The patent applies dynamics by transforming the fixed subtitle depth into a dynamic adjustable parameter. The system continuously analyzes object parallax in real-time and adjusts subtitle parallax accordingly, allowing the subtitle depth to change dynamically based on scene conditions rather than remaining static
Solution Approach 2:
The patent implements feedback by analyzing object parallax from stereoscopic images and using this information to adjust subtitle parallax. The system creates a closed-loop control where subtitle positioning is continuously optimized based on real-time analysis of the VR scene depth information
2Reliability
If the subtitle depth is fixed, then the processing speed is fast, but the user experiences visual discomfort when objects move closer than the subtitle
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing parallax information for multiple objects in the VR scene before subtitle rendering. This allows the system to quickly retrieve and compare parallax values during real-time subtitle positioning without performing complex depth analysis at render time
Solution Approach 2:
The patent changes the subtitle parallax parameter dynamically based on object parallax analysis. By adjusting this key parameter according to scene conditions, the system maintains reliable subtitle visibility while managing processing efficiency through selective parameter updates
3Manufacturing precision
If dynamic subtitle parallax adjustment is implemented, then subtitle visibility is improved, but the computational complexity increases
Solution Approach 1:
The patent extracts only the essential parallax information from the complex VR scene data. By focusing specifically on parallax values rather than full 3D reconstruction, the system achieves accurate subtitle positioning with reduced computational requirements
Solution Approach 2:
The patent uses simplified parallax models and pre-computed depth maps as copies of the full 3D scene information. These simplified representations provide sufficient data for subtitle positioning without requiring complete scene reconstruction, reducing processing complexity
Data Source
AI summary
A subtitle-embedding method for a virtual-reality (VR) video is provided. The method includes the following steps: obtaining a VR video; in response to execution of a display operation of the VR video, analyzing a current stereoscopic image of the VR video to obtain at least one object and an object parallax corresponding to the object in the current stereoscopic image; adjusting a subtitle parallax of a subtitle to be superimposed onto the current stereoscopic image according to the object parallax, wherein the subtitle parallax is greater than the object parallax; and superimposing the subtitle onto the current stereoscopic image using the calculated subtitle parallax.