Dynamic Gamut Mapping for Display Devices
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Solution Overview
Problem
Display devices often experience unnecessary gamut compression when attempting to render content with a gamut narrower or wider than their standard gamut, leading to image distortion and quality loss.
Innovation Solution
A display device and method that dynamically adjust gamut mapping data based on the input image signal and the device's gamut, applying varying degrees of compression to ensure maximum gamut output without distortion, using a gamut mapping lookup table or curve to convert input signals into output signals that match the device's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gamut mapping is performed regardless of input content gamut, then the display device can handle various gamut inputs, but unnecessary gamut compression occurs leading to image quality loss
Solution Approach 1:
The patent applies dynamics by making the gamut mapping process adaptive rather than fixed. The controller dynamically adjusts the gamut mapping degree based on real-time detection of the input image's gamut characteristics. When the input gamut is narrower than the display gamut, the system reduces or eliminates compression to preserve image quality. This dynamic adjustment resolves the contradiction by allowing the system to maintain versatility while preventing unnecessary quality loss.
Solution Approach 2:
The patent changes the parameter of gamut mapping degree based on the input image characteristics. By detecting the gamut of the input image and adjusting the mapping parameters accordingly, the system optimizes the balance between adaptability and image quality. This parameter adjustment ensures that gamut mapping is applied only when necessary, resolving the technical contradiction.
2Adaptability or versatility
If gamut mapping is applied to expand display gamut, then more colors can be displayed, but image distortion occurs when input gamut is narrower than display gamut
Solution Approach 1:
The system dynamically adjusts the gamut mapping degree based on the relationship between input and display gamut. When the input gamut is narrower, the system reduces mapping intensity to minimize distortion. This dynamic approach allows the display to maintain its color capability while preserving the original image's color accuracy, resolving the contradiction between adaptability and precision.
Solution Approach 2:
The patent applies local quality by differentiating the treatment of different color regions. Instead of uniform compression, the system adjusts mapping parameters selectively based on the specific gamut characteristics detected in the input image. This localized adjustment preserves color accuracy in critical regions while maintaining overall color display capability.
3Device complexity
If fixed gamut mapping is used, then the system is simple to implement, but it causes unnecessary compression for content with narrow gamut
Solution Approach 1:
The system transitions from a fixed to a dynamic gamut mapping approach. By detecting the input image's gamut characteristics and adjusting the mapping degree accordingly, the system reduces unnecessary compression while maintaining implementation feasibility. This dynamic adjustment minimizes color information loss without significantly increasing system complexity.
Solution Approach 2:
The patent implements feedback by detecting the gamut of the input image and using this information to adjust the gamut mapping process. This feedback mechanism ensures that mapping is applied only when necessary, reducing color information loss while keeping the system relatively simple through automated detection and adjustment.
Data Source
AI summary
A display device according to an embodiment of the present application comprises a storage configured to store gamut mapping data, a controller configured to, when an image signal is input, convert the input image signal into an output signal based on the gamut mapping data, and a display configured to display an image based on the output signal, wherein the controller changes the gamut mapping data according to the input image signal.