Display Color Appearance Model Adjustment for Environmental Adaptation
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Solution Overview
Problem
Conventional color appearance models, such as CIECAM02, have limited ability to modify color appearance based on the display environment and do not effectively account for interactions between back and front modulators in dual modulator display devices, leading to potential color mismatches perceived by viewers.
Innovation Solution
A method that senses the display environment, generates environment data, adjusts the color appearance model based on this data, and controls the backlight to compensate for physiological responses, including parameters like whitepoint achromatic response, adaptation degree, and luminance level, ensuring accurate color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional color appearance models (e.g., CIECAM02) are used, then the model structure is simple and easy to implement, but the ability to modify color appearance based on display environment is limited
Solution Approach 1:
The patent implements dynamic adjustment of color appearance model parameters based on detected display environment conditions. The system senses environmental factors (ambient light, viewing angle, temperature) and continuously adapts the CAM parameters in real-time, transforming the static conventional model into a dynamic system that responds to changing conditions. This resolves the contradiction by enabling environmental adaptability while maintaining the underlying simple model structure through parameter modulation rather than structural complexity.
Solution Approach 2:
The patent modifies color appearance model parameters (such as surround conditions, adaptation factors, chromatic induction factors) based on detected environmental conditions. Instead of changing the fundamental model structure, the system adjusts specific parameters like Fc, Nc, and surround ratios to match different display environments. This approach enhances adaptability while preserving the simplicity of the base model, directly resolving the technical contradiction.
2Measurement precision
If basic color appearance models are used, then the implementation is straightforward, but the accuracy of color representation in varying environments deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where environmental sensors continuously monitor display conditions (ambient lighting, temperature, viewing angle) and feed this information back to the color appearance model adjustment system. The system uses this feedback to dynamically recalibrate color parameters, ensuring accurate color representation despite environmental variations. This feedback loop resolves the contradiction by improving measurement precision through environmental awareness while managing complexity through automated closed-loop control.
Solution Approach 2:
The system performs self-adjustment of color appearance parameters based on environmental sensing without requiring manual intervention. The display device autonomously detects environmental conditions and modifies its color output characteristics accordingly, enabling accurate color representation in varying environments while avoiding the complexity of manual calibration systems. This self-service approach improves precision while keeping the system relatively simple.
3Reliability
If conventional CAMs are used without environmental sensing, then the device complexity is low, but the color mismatch perceived by viewers increases
Solution Approach 1:
The patent performs preliminary environmental assessment by sensing display conditions before rendering content. The system proactively adjusts color appearance model parameters based on detected environmental factors (ambient light spectrum, luminance levels, surrounding colors) before the viewer perceives any color mismatch. This preliminary adaptation ensures color perception consistency from the start, resolving the contradiction by improving reliability through advance environmental compensation while managing complexity through pre-adjustment rather than continuous correction.
Data Source
AI summary
In one embodiment the present invention includes a method that adjusts a display device according to a display environment. The method includes sensing the display environment of the display device and generating environment data that corresponds to the display environment. The environment data includes color data. The method further includes adjusting a color appearance model according to the color data, generating a control signal according to the color appearance model having been adjusted, and controlling a backlight of the display device according to the control signal. In this manner, a viewer perceives the images displayed by the display device in the manner intended by the content creator, because the adjustments to the color appearance model compensate for the viewer's physiological response to the display environment.