Color Sensor Calibration for Accurate Light Source Parameters
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Solution Overview
Problem
Traditional spectrometers for light source parameter measurement are expensive and bulky, making them unsuitable for large-scale applications in intelligent lighting, while color sensors provide inaccurate color metric parameters.
Innovation Solution
A method using a tristimulus-signal reading conversion coefficient derived from spectrometer and color sensor readings to calculate tristimulus values and light source parameters, eliminating the need for spectrometers and improving accuracy with a characterization model for color rendering index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectrometers are used to measure light source parameters, then measurement accuracy is improved, but device cost and complexity increase
Solution Approach 1:
The patent creates a mathematical mapping model (conversion coefficient matrix) that copies the measurement capability of spectrometers to color sensors. By establishing the relationship between spectrometer tristimulus values and color sensor signal readings through calibration with standard light sources, the system replicates spectrometer functionality using simpler, cheaper color sensors for actual measurements
Solution Approach 2:
The patent replaces the physical spectrometer instrument with a computational model. Instead of using optical dispersion and detection mechanisms of spectrometers, the system uses color sensors combined with pre-established conversion algorithms and characterization models to calculate light source parameters, substituting mechanical/optical measurement with electronic computation
2Device complexity
If color sensors are used to measure light source parameters, then device cost is reduced, but measurement accuracy deteriorates
Solution Approach 1:
The patent transforms the color sensor's limited narrow-band signal readings into accurate broadband color metric parameters through mathematical parameter transformation. By applying conversion coefficient matrices and characterization models that account for the sensor's spectral response characteristics, the system converts restricted sensor outputs into accurate tristimulus values and derived parameters
Solution Approach 2:
The patent introduces conversion coefficient matrices and characterization models as intermediaries between color sensor measurements and light source parameters. These mathematical models act as mediators that bridge the gap between the sensor's limited spectral information and the required accurate color metric parameters, enabling accurate measurement without direct spectrometer use
3Measurement precision
If spectrometers are used for light source measurement, then measurement accuracy is improved, but device portability and scalability worsen
Solution Approach 1:
The patent copies the measurement functionality from bulky spectrometers to compact color sensors through mathematical modeling. The system replicates spectrometer capabilities using small, lightweight color sensors combined with computational algorithms, enabling portable and scalable deployment in intelligent lighting applications
Solution Approach 2:
The patent replaces the heavy mechanical spectrometer system with a lightweight computational approach using color sensors. By substituting optical dispersion mechanisms with electronic signal processing and mathematical conversion, the system achieves spectrometer-level accuracy with minimal device weight and maximum portability
Data Source
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AI summary
A light source parameter measurement method, comprising: according to a tristimulus value acquired by a spectrometer and a signal reading value acquired by a color sensor, acquiring a conversion coefficient between the tristimulus value and the signal reading value; by means of the color sensor, performing measurement on a light source to be subjected to measurement, and acquiring a signal reading value of said light source; acquiring a tristimulus value of said light source according to the signal reading value of said light source, and the conversion coefficient between the tristimulus value and the signal reading value; and acquiring several light source parameters of said light source according to the tristimulus value of said light source. Further provided is a light source parameter measurement apparatus.