Optical Filter Enhancing Color Contrast via Sigma Theta Optimization
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Solution Overview
Problem
Existing optical filters do not effectively enhance color contrast for individuals with normal color vision (NCV) or those developing acquired color vision deficiency (CVD) due to age or disease.
Innovation Solution
The development of an optical filter design that optimizes parameters such as Sigma(θ) to enhance color contrast, with a transmission spectrum that provides a maximum Sigma(θ) value at θmax and a minimum Sigma(θ) value at θmin, while maintaining a neutral chromaticity close to the illuminant chromaticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing optical filters are used, then color vision is maintained, but color contrast enhancement is insufficient for NCV individuals and those with acquired CVD
Solution Approach 1:
The patent applies parameter changes by optimizing the transmission spectrum of the optical filter to achieve a maximum Sigma(θ) value at a specific angle θmax (between 20-60 degrees) while maintaining a minimum Sigma(θ) value between -10 and 10. This spectral parameter optimization enhances color contrast for NCV individuals along the lime-magenta direction while preserving color accuracy through controlled parameter ranges.
Solution Approach 2:
The patent implements local quality by selectively enhancing color contrast in specific regions of the color spectrum (lime-magenta direction) while maintaining neutral chromaticity overall. The filter achieves this by having a targeted transmission spectrum that provides localized enhancement where needed (maximum Sigma at θmax) while keeping other regions minimal (minimum Sigma near zero), thus improving contrast without introducing overall color distortion.
2Measurement precision
If the filter enhances color contrast along lime-magenta direction, then color perception is improved, but color distortion may occur in other directions
Solution Approach 1:
The patent controls color distortion by precisely defining parameter ranges: the maximum Sigma(θ) value is greater than 35 at angle θmax (20-60 degrees), while the minimum Sigma(θ) value is constrained between -10 and 10. This parameter control ensures enhancement in the lime-magenta direction while preventing excessive distortion in other color directions through the minimal Sigma values at orthogonal orientations.
Solution Approach 2:
The patent converts the potential harm of color distortion into benefit by using a neutral chromaticity filter design. The filter's chromaticity is measured to be less than 0.0200 distance from the illuminant chromaticity in the CIE 1931 2-degree color space, with correlated color temperature between 4500K and 7000K. This neutral baseline converts what could be harmful distortion into beneficial enhancement, as the filter adds contrast without introducing unwanted color casts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The filter design significantly enhances color contrast for NCV individuals, particularly along the lime-magenta color direction, while minimizing changes along the cyan-orange direction, thus improving color perception and reducing the risk of color distortion.
Implementation Method 1
Optical filters are devices having wavelength-selective transmission acting on sources or receivers of lights
Data Source
AI summary
This application discloses an optical filter designed to enhance color contrast even for people with ostensibly normal color vision. The optical filter design relies on optimizing a set of parameters that correlate to improved or enhanced color perception. In particular, the parameter Sigma(θ) is optimized.