Dynamic Subtitle Color Adjustment for Video Readability
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Solution Overview
Problem
Text subtitles in videos often become unreadable due to lack of contrast with dynamically changing backgrounds, affecting user experience, especially for the hearing impaired and those learning new languages.
Innovation Solution
A method that calculates the similarity between subtitle text color and background color within a video frame, applying modifications such as tone variations or contrasting font strokes to enhance visibility, ensuring clear readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If subtitle text is rendered with consistent color positioning to facilitate location and visualization, then ease of operation is improved, but readability deteriorates when background color similarity is high
Solution Approach 1:
The patent applies dynamic color adjustment to subtitle text, changing the color from static to adaptive based on background analysis. The system calculates similarity between subtitle color and background color, then dynamically modifies the subtitle color to ensure sufficient contrast while maintaining consistent positioning. This resolves the contradiction by making the subtitle color dynamic rather than fixed, allowing it to adapt to varying background conditions while preserving its stable location.
Solution Approach 2:
The patent changes the color parameter of subtitle text based on calculated similarity metrics. When the similarity between subtitle color and background color exceeds a threshold, the system modifies the subtitle color parameters (hue, saturation, or brightness) to achieve adequate contrast. This parameter adjustment maintains the subtitle's consistent positioning while ensuring readability across different background conditions.
2Reliability
If subtitle color remains consistent to maintain visual identity, then reliability is improved, but visibility deteriorates against similar backgrounds
Solution Approach 1:
The patent applies local quality modification by analyzing the specific background region where subtitles will be displayed and adjusting only the subtitle color in that local area. The system calculates the predominant color of the background region and modifies subtitle color locally based on this analysis, rather than changing global video properties. This maintains visual identity through controlled adjustments while ensuring visibility against similar backgrounds.
Solution Approach 2:
The patent directly addresses color interaction by implementing color change mechanisms for subtitle text. The system calculates color similarity between subtitles and background, then applies color transformations (such as complementary color selection or contrast enhancement) to ensure the subtitle color differs sufficiently from the background while maintaining readability and visual consistency.
Data Source
AI summary
A method for modifying a subtitle of a video frame. Subtitle text representing audio content of a video frame and font attributes of the subtitle text are received. A color of the subtitle text is identified, based on the font attributes of the subtitle text. A geometric region within the video frame corresponding to a display area of the subtitle text. A predominant color of the geometric region within the video frame is calculated. A level of similarity between the color of the subtitle text and the predominant color of the geometric region is determined. Rendering information of the subtitle text is calculated, based on the level of similarity, and a modification of the subtitle text is performed by applying the rendering information to the subtitle text, such that the modification reduces the similarity level during display of the video frame.