3D Subtitle Depth Adaptation for Cinema Display
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Solution Overview
Problem
Conventional subtitle display systems for 3D motion pictures struggle to accurately and efficiently determine the depth of 3D image content, leading to viewing discomfort due to inconsistent and unreliable depth calculations, particularly in immersive environments like large-screen cinemas, where subtitles may appear double or difficult to read.
Innovation Solution
The system processes and displays stereoscopic 3D subtitles with content-adaptive depth, using a digital cinema package (DCP) format, computing a proxy depth based on abstract depth maps and disparity distribution to ensure accurate and consistent placement of subtitles relative to the 3D image content, thereby enhancing viewer comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional subtitle display systems use monoscopic subtitles at fixed depth, then implementation is simple, but viewers experience discomfort and difficulty reading due to inconsistent depth perception in 3D environments
Solution Approach 1:
The patent implements dynamic subtitle depth adjustment by computing proxy depth values for each subtitle element based on the 3D content being displayed. Unlike fixed monoscopic subtitles, the subtitle depth changes dynamically to match the depth of relevant 3D objects, improving readability while maintaining system feasibility through automated depth map generation and proxy depth calculation algorithms
Solution Approach 2:
The patent introduces an intermediary processing system between the 3D content and subtitle display. This intermediary computes depth maps from 3D image sequences, calculates proxy depths for subtitle elements, and adjusts subtitle rendering parameters accordingly. This intermediary layer resolves the contradiction by adding necessary complexity to achieve reliable subtitle readability without requiring complete system redesign
2Ease of operation
If subtitles are placed at screen depth for both eyes, then conventional display systems can be used, but subtitles appear behind main objects causing double images and reading difficulty in immersive environments
Solution Approach 1:
The patent applies local quality by placing subtitles at different depth positions depending on their relationship to main 3D objects. Instead of uniform screen-depth placement, each subtitle element is positioned at a proxy depth that places it in front of or at the appropriate depth relative to the main objects it describes, ensuring viewing comfort and eliminating double images while maintaining ease of operation through automated depth-based positioning
Solution Approach 2:
The patent transitions from 2D monoscopic subtitle placement to 3D spatial positioning by introducing depth as an additional dimension. Subtitles are no longer confined to a single screen-depth plane but are positioned along the depth axis based on proxy depth calculations, allowing them to appear in front of main objects and improving viewing comfort in immersive 3D environments
3Measurement precision
If depth calculations are performed in real-time for content adaptive subtitles, then accurate depth placement is achieved, but processing time and computational resources increase
Solution Approach 1:
The patent applies preliminary action by pre-computing depth maps from 3D image sequences before subtitle rendering. The depth maps are generated in advance and stored, allowing rapid proxy depth calculation during subtitle display without requiring real-time depth analysis. This approach maintains high measurement precision while significantly reducing processing time during actual subtitle presentation
Solution Approach 2:
The patent uses copying by creating simplified proxy depth representations from the full 3D scene data. Instead of performing complex real-time depth calculations for each subtitle element, the system copies and utilizes pre-computed depth map information to determine subtitle placement. This copying approach maintains accurate depth positioning while minimizing computational overhead and processing time
Data Source
AI summary
The present invention relates generally to methods and systems for the production of 3D motion picture subtitles adapted to image content for improved viewer experience. Some embodiments of the present invention relate to positioning subtitles at variable, scene-dependent depth. Certain aspects of the present invention may be applicable to general 3D display applications and/or digital projection of 3D motion pictures.