Video Display Tone Mapping Switching for Stable Graphics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current video display systems face challenges in stabilizing the display of HDR videos with dynamic metadata, leading to variations in graphics luminance and color, especially when graphics with constant luminance are overlaid on moving images, resulting in undesirable effects such as luminance and color variations.
Innovation Solution
A video display system that switches between dynamic and static tone mapping operations based on flags and metadata processing, using static metadata to fix tone mapping when graphics are overlaid, and dynamic metadata to adapt to varying luminance, ensuring stable graphics display and optimal HDR effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic tone mapping is used to adapt to varying luminance in HDR videos, then the HDR effects are maximized, but the luminance and color of overlaid graphics vary undesirably
Solution Approach 1:
The patent segments the video processing into two distinct paths: one for the main video content (applying dynamic tone mapping) and one for overlaid graphics (applying static tone mapping). This segmentation allows each element to be processed differently according to its specific requirements, resolving the contradiction between adapting to luminance variations and maintaining graphics stability
Solution Approach 2:
The patent applies different quality characteristics to different parts of the video output: dynamic tone mapping characteristics are applied to the main video content to maximize HDR effects, while static tone mapping characteristics are applied to overlaid graphics to ensure stable luminance and color. This local differentiation resolves the contradiction by allowing each region to have optimal properties for its function
2Stability of the object's composition
If static tone mapping is used to stabilize graphics display, then graphics luminance remains constant, but HDR effects are reduced
Solution Approach 1:
The processing is segmented so that static tone mapping is applied only to the graphics overlay layer while dynamic tone mapping is applied to the main video content. This allows graphics stability to be maintained without sacrificing HDR effects in the main content
Solution Approach 2:
The system dynamically selects which tone mapping method to apply based on the type of content being processed. Graphics elements trigger static tone mapping while video content uses dynamic tone mapping, allowing the system to adapt its behavior to the specific content type rather than using a fixed approach
3Measurement precision
If dynamic metadata is used for tone mapping, then luminance adaptation improves, but processing complexity increases
Solution Approach 1:
The system performs preliminary analysis to detect when graphics are overlaid on the video content. Based on this preliminary detection, it pre-determines to use static metadata for graphics and dynamic metadata for video content, avoiding the need for complex real-time switching and reducing processing complexity during actual display
Data Source
AI summary
A video display system includes: a tone mapping processor; a display; and a metadata processor that generates first dynamic metadata that indicates a maximum luminance that is constant over a plurality of time intervals by using static metadata. The video display system switches between: a first operation of (i) generating the first dynamic metadata by using the static metadata, performed by the metadata processor and (ii) performing the tone mapping process by using the first dynamic metadata, performed by the tone mapping processor; and a second operation of performing the tone mapping process by using second dynamic metadata in which the maximum luminance varies over the plurality of time intervals, performed by the tone mapping processor.