Video Decoder Sub-picture Aspect Ratio Control
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Solution Overview
Problem
Existing digital audio/video playback systems often fail to completely display subtitles due to overlay issues and format incompatibilities, leading to incomplete or difficult-to-read subtitles during playback of digital films across different standards and aspect ratios.
Innovation Solution
A video decoding apparatus and method that control the aspect ratio and position of sub-pictures by decoding digital audio/video signals, using scalers to generate scaling factors for both video and sub-picture bit streams, ensuring they are combined and displayed without overlay, even across different formats and standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple subtitles are displayed simultaneously, then users can access multiple language options, but overlay among subtitles occurs making them difficult to read
Solution Approach 1:
The patent applies dimensionality change by utilizing the time dimension to separate subtitle displays. Instead of displaying multiple subtitles simultaneously in the same spatial dimension, the system presents subtitles sequentially in different time slots, thereby eliminating overlay while preserving multilingual functionality.
Solution Approach 2:
The patent implements dynamics by making the subtitle display timing adaptive and variable. The system dynamically adjusts subtitle presentation based on content type, language, and timing information, allowing flexible control over when each subtitle appears to prevent overlap and maintain readability.
2Adaptability or versatility
If PAL standard DVD films are played back in NTSC standard systems, then international compatibility is achieved, but subtitles at the lower end of the picture are cut off
Solution Approach 1:
The patent applies parameter changes by adjusting the vertical position and timing parameters of subtitle display based on the detected format (PAL or NTSC). The system modifies subtitle presentation parameters to accommodate different resolution standards, ensuring complete subtitle visibility regardless of the playback format.
Solution Approach 2:
The patent implements universality by creating a subtitle display system that functions correctly across multiple formats (both PAL and NTSC). The system is designed to automatically adapt to different standards while maintaining consistent subtitle presentation quality, achieving format-agnostic subtitle display.
3Ease of operation
If sub-pictures are displayed without control on aspect ratio and position, then display simplicity is maintained, but overlay among sub-pictures occurs and completeness is compromised
Solution Approach 1:
The patent applies self-service by enabling the subtitle display system to automatically control its own positioning and timing without requiring manual intervention. The system autonomously adjusts sub-picture parameters based on embedded timing information and format detection, maintaining simplicity while ensuring complete display.
Solution Approach 2:
The patent implements feedback mechanisms by using timing information and format detection to automatically adjust subtitle display parameters. The system receives feedback about the playback format and subtitle timing, then adjusts positioning and presentation accordingly to prevent overlay and ensure completeness.
Data Source
AI summary
A video decoding apparatus capable of controlling presentation of sub-pictures includes a first decoder, a second decoder, a first scaler, a second scaler and a combiner. The first decoder and the second decoder respectively decode a digital audio/video signal to generate a decoded video and a decoded sub-picture. In accordance with an output picture size, the decoded video size, the decoded sub-picture size and a sub-picture aspect ratio, the first scaler and the second scaler generate a first scaling factor and a second scaling factor. The combiner combines the decoded video and the decoded sub-picture according to the first scaling factor and the second scaling factor and outputs the combination thereof. A video decoding method and a digital audio/video playback system capable of controlling presentation of sub-pictures are also disclosed.