Optical Filter Array Layout for Noise-Resistant Hyperspectral Imaging
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Solution Overview
Problem
Existing hyperspectral cameras suffer from reduced spectral resolution due to random noise in the captured images, which deteriorates the accuracy of spectral image reconstruction.
Innovation Solution
A filter array is designed with optical filters having specific light transmittance characteristics (Mi≥0.1, σi≥0.05) for each wavelength band, incorporating interference layers and reflective layers to suppress noise and enhance spectral resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical filters are used in hyperspectral cameras, then the device can capture multi-wavelength information, but random noise in the captured images reduces spectral resolution and deteriorates accuracy of spectral image reconstruction
Solution Approach 1:
The patent applies parameter changes by optimizing the light transmittance characteristics of optical filters. Specifically, it defines criteria where the average light transmittance μi in each wavelength band satisfies μi−σi≥0.1, with σi being the standard deviation. This parameter optimization ensures that filters provide sufficient light transmission while maintaining spectral discrimination capability, thereby improving spectral resolution and noise immunity simultaneously
Solution Approach 2:
The patent applies local quality by designing optical filters with wavelength-dependent transmittance characteristics tailored to specific wavelength bands. Each filter is optimized to have distinct transmittance profiles across different wavelength bands, enabling the system to achieve high spectral resolution through localized optimization of filter properties rather than uniform treatment
2Measurement precision
If optical filters with high spectral discrimination are used, then spectral resolution improves, but light transmittance may be reduced leading to lower detection sensitivity
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing specific criteria for light transmittance optimization. The condition μi−σi≥0.1 ensures that the average light transmittance in each wavelength band is sufficiently high while maintaining spectral discrimination. This parameter-based approach allows the system to achieve both high spectral resolution and adequate detection light intensity
Solution Approach 2:
The patent applies local quality by optimizing light transmittance characteristics for specific wavelength bands. Each optical filter is designed with wavelength-dependent properties that locally maximize light transmission in its target band while maintaining discrimination capability. This localized optimization ensures sufficient detection light intensity without compromising spectral resolution
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 array improves spectral resolution and noise immunity, leading to enhanced accuracy in spectral image reconstruction and increased detection light intensity.
Implementation Method 1
incorporating interference layers and reflective layers to suppress noise and enhance spectral resolution
Implementation Method 2
The optical filters include various types of optical filters with different light transmittance with respect to each of the N wavelength bands
Data Source
AI summary
A filter array used in a light detection device, which generates image data corresponding to each of N wavelength bands (N being an integer greater than or equal to 2) included in a specific wavelength range, includes optical filters. The optical filters include various types of optical filters with different light transmittance with respect to each wavelength band. Mi≥0.1 with respect to each wavelength band, where Mi=μi−σi, μi denoting an average value of light transmittance of the optical filters with respect to light having a wavelength included in an i-th wavelength band (i being an integer greater than or equal to 1 and less than or equal to N) of the N wavelength bands, σi denoting a standard deviation of the light transmittance of the optical filters with respect to the light having the wavelength included in the i-th wavelength band.