Colour Filter Spectral Transmission for Discrimination and Identification

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Solution Overview

Problem

Existing color filters primarily improve color discrimination but fail to enhance color identification for individuals with deficient color vision, and they often affect adjacent color receptors, leading to weaker results as the severity of color vision deficiency increases.

Innovation Solution

A method for designing a color filter that maximizes color discrimination and minimizes color identification differences by considering the impact on both color discrimination and identification, using ganglion cell signal processing models and spectral transmission functions to optimize color perception for specific color samples.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing color filters are used to improve color discrimination, then color discrimination is enhanced, but color identification remains unaffected and adjacent color receptors are influenced negatively

Engineering Contradiction:

Improvecolor discriminationVSAvoidcolor identification

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies local quality by designing the color filter with specific spectral transmission characteristics tailored to affect only the L-cone or M-cone sensitivity curves selectively. The filter transmission function T(λ) is engineered to shift the spectral sensitivity of the affected cone type without significantly impacting adjacent cone types, thereby improving color discrimination while preserving color identification accuracy.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs parameter changes by modifying the spectral transmission parameters of the color filter to achieve optimal shifting of cone sensitivity curves. By adjusting the transmission function T(λ) parameters, the filter shifts the peak sensitivity wavelengths of L-cones or M-cones to compensate for the spectral sensitivity abnormalities in color vision deficiency, thereby resolving the contradiction between improved discrimination and maintained identification.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If color filters shift spectral sensitivity of cones, then color discrimination improves, but the effect weakens as severity of color vision deficiency increases due to impact on adjacent receptors

Engineering Contradiction:

Improvecolor discriminationVSAvoideffectiveness

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs dynamics by providing a color filter set with multiple filters having different spectral transmission functions T(λ). Users can select the most appropriate filter based on the severity and type of their color vision deficiency, allowing the system to adapt dynamically to different conditions and maintain effectiveness across varying severity levels.

Inventive Principle:

Principle #15Dynamics

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 designed color filter effectively enhances color discrimination and identification for individuals with and without color vision deficiencies, improving visual experience and accuracy in various tasks and environments.

Implementation Method 1

the spectral transmission function of a colour filter 10 is designed for a human eye 20 with given colour vision... such that the spectral transmission function of the colour filter 10, when the spectral sensitivity functions of the L-, M- and S-cone colour-sensing receptors of the human eye 20 are shifted into the proper spectral direction by the effect of the colour filter 10

Methodology Applied

Scientific EffectSpectral filtering: Filter (optical)

Implementation Method 2

the spectral transmission function of the colour filter 10 is designed... such that the spectral transmission function of the colour filter 10, when the spectral sensitivity functions of the L-, M- and S-cone colour-sensing receptors of the human eye 20 are shifted into the proper spectral direction by the effect of the colour filter 10

Methodology Applied

Scientific EffectSpectral shifting: Doppler Effect

Data Source

PatentUS20250298262A1Method of designing a colour filter for modifying human colour vision, such colour filter and colour filter set

Publication Date: 2025.09.25 MEDICONTUR MEDICAL ENGINEERING LTD

AI summary

The object of the invention relates to a method of designing a colour filter for modifying human colour vision by defining the spectral transmission function of the colour filter such as to maximise colour discrimination between more than one element, colour sample, of a colour sample set when a targeted human eye, the colour vision of which is to be modified, is viewing the colour sample set with the colour filter, and at the same time such as to minimise the difference between the colour identification of the colour samples by the targeted eye and a reference eye having a reference colour vision.The object of the invention also relates to such a colour filter, such a colour filter set, and the use of such colour filter and a method for modifying human colour vision.