EOTF Curve Selection for HDR Display Brightness
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Solution Overview
Problem
Image display devices struggle to maintain the expressive power and vitality of High Dynamic Range (HDR) images due to a narrower output brightness range compared to the HDR image itself, leading to reduced quality, especially in bright parts.
Innovation Solution
An image display device equipped with a controller that selects and applies an Electro-Optical Transfer Function (EOTF) curve tailored to the maximum output brightness of the display and the maximum content brightness of the HDR image, allowing for optimal brightness expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a standard EOTF curve for HDR images is used, then the brightness range of the HDR image is preserved, but the expressive power and vitality decrease when the display's output brightness range is narrower than the HDR image's brightness range
Solution Approach 1:
The patent applies dynamics by making the EOTF curve adjustable and adaptable rather than fixed. The system dynamically selects or modifies EOTF curves based on the display device's actual brightness capabilities and the HDR content's requirements, allowing the transfer function to adapt to different operating conditions and maximize expressive power within hardware constraints
Solution Approach 2:
The patent changes the parameters of the EOTF curve to match the display device's specific brightness range. By modifying the EOTF parameters (such as the knee point position and curve shape) to align with the display's maximum output brightness and the content's maximum brightness, the system optimizes the mapping between electrical and optical domains while preserving image vitality
2Reliability
If the EOTF curve is adjusted to match the display's narrower brightness range, then the expressive power is maintained, but the brightness expression capability is limited by hardware
Solution Approach 1:
The patent modifies the EOTF curve parameters to optimize brightness mapping within the display's hardware constraints. By adjusting parameters like the knee point position and curve slope to match the display's maximum output brightness, the system achieves the best possible brightness expression capability while maintaining image vitality and avoiding loss of information
3Adaptability or versatility
If multiple EOTF curves are stored for different brightness conditions, then the adaptability to different HDR content is improved, but the device complexity increases
Solution Approach 1:
The patent segments the EOTF curve selection into different categories or groups based on brightness characteristics. By organizing multiple EOTF curves into structured segments (e.g., different maximum brightness levels, different content types), the system improves adaptability to various HDR content while managing device complexity through systematic organization and selective application
Data Source
AI summary
The present disclosure relates to: an image display device having an EOTF for an HDR image which can maximize the expression or vividness of an HDR image output in the image display device even if the output brightness range according to the hardware performance of the image display device is narrower than the brightness range of the HDR image; and a control method therefor. According to one aspect of the present disclosure, an image display device may be provided, the image display device comprising: a display; a storage unit for storing a plurality of EOTF curves for displaying an HDR content image; and a control unit for causing the content image to be displayed by using EOTF curves, from among the plurality of EOTF curves, corresponding to the maximum output brightness of the display and the maximum content brightness of the content.