Spectral Illumination Selection for Object-Background Contrast
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Solution Overview
Problem
Existing methods for selecting illumination light to enhance object visibility rely on individual observers' personal views and trial and error, lacking a systematic approach to determine optimal spectral distribution.
Innovation Solution
A method involving the determination of representative and comparative wavelengths using an xy chromaticity diagram to increase contrast between an object and its background, employing a first light source with specific characteristics and a second light source configured to emit these wavelengths, guided by a processor and spectral radiance meter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual observers select light for illumination based on personal views and trial and error, then the selection process is simple and flexible, but the visibility enhancement is inconsistent and time-consuming
Solution Approach 1:
The patent transforms the subjective parameter selection process into an objective one by using spectral radiance measurements and chromaticity diagram analysis. Specific parameters including representative wavelengths (where spectral radiance peaks occur), comparative wavelengths (determined via xy chromaticity diagram), and quantitative contrast ratios replace subjective observer judgments, enabling precise and repeatable illumination selection
Solution Approach 2:
The manual trial-and-error mechanical process of selecting illumination light is replaced with an automated optical measurement and calculation system. The spectral radiance meter, processor, and chromaticity diagram-based algorithms substitute for human observers, automatically determining optimal wavelengths and evaluating contrast ratios without subjective intervention
2Measurement precision
If a systematic method using spectral analysis and chromaticity diagrams is implemented, then visibility enhancement becomes objective and precise, but the device complexity increases
Solution Approach 1:
The patent extracts only the critical spectral components needed for visibility enhancement by identifying representative wavelengths (peaks in spectral radiance) and comparative wavelengths (determined through xy chromaticity diagram analysis). This extraction approach simplifies the complex spectral distribution into discrete, manageable wavelength pairs that can be implemented with standard optical filters and light sources
Solution Approach 2:
The xy chromaticity diagram serves as an intermediary tool that bridges the gap between spectral radiance measurements and practical illumination selection. The processor uses the chromaticity diagram to objectively determine comparative wavelengths based on color opponency theory, providing a systematic method to translate spectral data into actionable illumination parameters without requiring complex subjective evaluation
Data Source
AI summary
A method for illumination of an object to be observed to be observed and the background, the method comprising the steps of: obtaining a relationship between wavelength and spectral radiance of the object while the object and the background are illuminated by a first light source that emits light that has a continuous spectrum in the wavelength range from 380 nanometers and 780 nanometers, and determining a value of representative wavelength that corresponds to a maximum value of the spectral radiance of the object plotted against wavelength or values of representative wavelength that correspond to maximum values of the spectral radiance of the object plotted against wavelength; determining a value or values of comparative wavelength; and illuminating the object and the background with light of the value or values of representative wavelength and light of the value or values of comparative wavelength.