Perception-Based Video Rendering for Consistent Color Across Displays
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Solution Overview
Problem
The challenge of achieving consistent color perception across different displays and among individuals with varying color vision characteristics in a video ecosystem, particularly with the increasing use of High Dynamic Range (HDR) and Wide Color Gamut (WCG) features, is not adequately addressed by existing technologies.
Innovation Solution
A method and device that utilize observer and display metadata to adapt color transforms based on physiological models and chromaticity coordinates, enabling personalized colorimetric adaptation by obtaining and applying transforms specific to individual user and display characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If standard color transforms are used for HDR and WCG features, then display capabilities are improved, but color perception consistency deteriorates across different observers and displays
Solution Approach 1:
The patent applies parameter changes by modifying color transform parameters based on observer-specific physiological parameters (age, field size) and display-specific characteristics. The system adjusts the color transform matrix parameters to compensate for observer metamerism failure, thereby maintaining color perception consistency while utilizing HDR and WCG capabilities.
Solution Approach 2:
The patent implements local quality by applying personalized color transforms tailored to each observer's specific characteristics. Instead of using a universal color transform, the system adapts the color transformation locally to each user's physiological profile and the specific display device being used, ensuring optimal color perception for each individual.
2Manufacturing precision
If personalized colorimetric adaptation is implemented, then color perception consistency is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining standardized observer categories with associated color matching functions and transform parameters. Instead of requiring real-time measurement of each user's physiological characteristics, the system allows users to select from pre-established observer profiles, thereby reducing system complexity while maintaining personalized adaptation capabilities.
Solution Approach 2:
The system manages complexity by parameterizing the color transformation process based on selected observer categories. The complexity is reduced by changing discrete parameters (selecting from predefined observer categories) rather than requiring continuous measurement and customization of all physiological parameters.
Data Source
AI summary
Methods, devices and video data for encoding, transmitting and decoding a video content item that is rendered and displayed with the same perceived color per any viewer, a content creator included, on any display. The colors wanted by the content creator are encoded in video data in association with master display information corresponding to the display used by the content creator and with master observer information corresponding to the vision characteristics of the content creator. Reciprocally, at decoder side, user display information and user observer information are collected. The rendered video on the user display is color adapted by using both the master information and the user information.