Dynamic Graphical Overlay Bitrate Reduction via Scene Analysis
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Solution Overview
Problem
Existing video communication systems face challenges in reducing the bitrate of video streams with graphical overlays, particularly in low bitrate applications where the overlay's contribution to the overall bitrate is substantial due to fixed properties like size, position, and animation, which are not adjusted based on the underlying video content.
Innovation Solution
A method that dynamically adjusts the position, degree of animation, and color composition of graphical overlays in real-time based on the scene's content to ensure the bitrate remains within an upper threshold, by estimating the required bitrate and making adjustments only when necessary, such as during changes in the video stream or when a PTZ signal is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the graphical overlay uses fixed properties (size, position, animation) to maintain visibility and branding, then the overlay's contribution to bitrate remains substantial, but if properties are dynamically adjusted based on video content, then bitrate can be reduced while maintaining acceptable visual quality
Solution Approach 1:
The patent applies dynamics by making the graphical overlay properties (position, size, animation degree, color composition) adjustable and adaptive based on video content characteristics. Instead of fixed properties, the overlay dynamically modifies its attributes in response to scene complexity, motion levels, and contrast measurements, thereby reducing bitrate requirements while maintaining visibility and branding effectiveness
Solution Approach 2:
The patent implements parameter changes by systematically modifying multiple overlay parameters including position coordinates, size dimensions, animation speed and complexity, and color composition. These parameter adjustments are driven by quantitative analysis of video content such as motion magnitude, scene complexity metrics, and contrast values, enabling bitrate reduction through optimized overlay representation
2Reliability
If the graphical overlay maintains high visibility through fixed properties, then branding effectiveness is preserved, but the bitrate contribution increases substantially in low bitrate applications
Solution Approach 1:
The patent applies local quality by adjusting overlay properties specifically in regions and time periods where they are most needed for branding effectiveness. The system analyzes video content to determine optimal overlay characteristics for different scenes, applying higher visibility properties only when necessary while using reduced properties in other contexts, thereby maintaining branding effectiveness with lower overall bitrate
Solution Approach 2:
The patent uses dynamics to make overlay properties adaptive rather than static, allowing the system to maintain branding effectiveness by adjusting position, size, and visibility based on real-time video content analysis. This dynamic approach ensures branding remains effective during critical moments while reducing bitrate during less critical segments
3Loss of energy
If the graphical overlay properties are adjusted dynamically based on video content, then bitrate is reduced, but the complexity of the system increases
Solution Approach 1:
The patent implements feedback by continuously analyzing video content characteristics (motion, scene complexity, contrast) and using this information to adjust overlay properties. The system measures actual video parameters and feeds this information back to the overlay rendering engine, which then modifies overlay attributes accordingly, creating a closed-loop system that reduces bitrate through data-driven decisions
Solution Approach 2:
The patent applies self-service by enabling the overlay system to automatically adjust its own properties based on video content analysis without requiring external manual intervention. The system autonomously performs content analysis, determines optimal overlay parameters, and implements adjustments, thereby reducing bitrate while managing complexity through automation rather than manual control
Data Source
AI summary
The present invention relates generally to video communication systems, and more specifically to a method and device for adjusting properties of a graphical overlay for a video stream, the adjusted properties being at least one of a position, a degree of animation and a color composition of the graphical overlay and the adjustment is based on a scene depicted by the time period of the video stream. The adjustment is performed if an estimated bitrate for transmitting an encoded bitstream comprising the time period of the video stream and the graphical overlay exceeds a predetermined upper threshold bitrate for transmitting an encoded single bitstream comprising the time period of the video stream and the graphical overlay.