HDR Tone Mapping With Ambient-Light Compensation
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Solution Overview
Problem
Existing consumer electronic devices struggle to maintain high-dynamic range (HDR) picture quality when ambient lighting conditions change, as content mastered in dark environments degrades in brighter surroundings, failing to preserve the creative intent of the content provider.
Innovation Solution
A method and system for HDR tone mapping that adapts to ambient light conditions using creative intent metadata, employing multi-dimensional metadata and ambient light information to generate a tone mapping function that compensates for lighting changes, preserving image quality and hue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If content is mastered in dark environments, then picture quality is optimized for dark viewing conditions, but picture quality degrades in brighter ambient lighting conditions
Solution Approach 1:
The tone mapping function is dynamically adjusted based on detected ambient light conditions. The system transitions from static content mastering to dynamic adaptation by modifying tone mapping parameters in real-time according to the measured luminance levels of the ambient environment, allowing the display to optimize picture quality for different viewing conditions.
Solution Approach 2:
The system changes the parameters of the tone mapping function based on ambient light measurements. By adjusting tone mapping parameters such as brightness, contrast, and gamma according to the detected ambient luminance, the system maintains picture quality across varying ambient light conditions while preserving the creative intent of the original content.
2Manufacturing precision
If ambient light compensation is applied, then picture quality is maintained in bright environments, but the creative intent of the content provider may be altered
Solution Approach 1:
The system uses feedback from ambient light sensors to adjust tone mapping parameters. By continuously monitoring the ambient luminance and comparing it to reference conditions, the system applies compensatory adjustments that maintain picture quality while attempting to preserve the original creative intent through controlled modifications based on measured environmental conditions.
Solution Approach 2:
The tone mapping function is pre-configured with parameters that can be adaptively adjusted. The system prepares multiple tone mapping configurations and selects/apples the appropriate one based on detected ambient conditions, allowing preliminary optimization while maintaining flexibility to preserve creative intent through selective application of compensation.
Data Source
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AI summary
One embodiment provides a method comprising determining multi-dimensional metadata corresponding to an input image, and determining ambient light information indicative of a level of ambient light in an ambient environment of a display device. The multi-dimensional metadata comprises a distribution function of pixels in the input image. The method further comprises determining, based on the ambient light information, one or more gains that adaptively compensate for the level of ambient light in the ambient environment. The method further comprises generating a tone mapping function based on the multi-dimensional metadata and the one or more gains, and applying the tone mapping function to the input image to generate a tone-mapped image that adaptively compensates for the level of ambient light in the ambient environment. The tone-mapped image is provided to the display device for presentation.