Image Capturing Device Spectral Estimation Feedback Control
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Solution Overview
Problem
Existing methods for estimating the spectral characteristic of a subject based on statistical data are prone to inaccuracies when the statistical data is incorrect, leading to deviations in accuracy.
Innovation Solution
An image capturing device that generates illumination light with multiple wavelength bands and adjusts its characteristics based on estimated spectral characteristics, using a processor to select and validate statistical data by ensuring the image signal meets achromatic color criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If statistical data is used for estimating spectral characteristic, then estimation can be performed, but accuracy largely deviates when statistical data is incorrect
Solution Approach 1:
The patent implements a feedback mechanism where the estimated spectral characteristic is used to define illumination characteristics, which then illuminate the subject and generate new image signals. The system checks whether these new signals satisfy achromatic color conditions, and based on this check, determines whether the statistical data is adequate. This closed-loop feedback allows the system to validate and refine its spectral estimation, reducing dependence on initially correct statistical data.
Solution Approach 2:
The patent performs preliminary spectral characteristic estimation using available statistical data before actual image capture. This preliminary estimation allows the system to define appropriate illumination characteristics in advance, which are then used to illuminate the subject. This preliminary action enables the system to prepare optimal illumination conditions based on preliminary spectral analysis, improving overall estimation accuracy.
2Measurement precision
If illumination characteristics are controlled based on spectral estimation, then spectral accuracy is improved, but additional processing steps are required
Solution Approach 1:
The patent makes the illuminator multi-functional by enabling it to operate in two modes: capturing images under natural light conditions and capturing images under controlled illumination characteristics. The same illuminator hardware is used for both purposes, eliminating the need for separate illumination devices. This universality reduces overall system complexity while enabling the sophisticated illumination control needed for improved spectral accuracy.
3Measurement precision
If multiple wavelength bands are used for illumination, then spectral estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent changes the illumination parameters by controlling the illuminator to emit light with specific spectral characteristics based on the estimated spectral characteristic of the subject. The system adjusts illumination intensity and spectral distribution across multiple wavelength bands, creating illumination conditions that compensate for the subject's spectral properties. This parameter control enables accurate spectral estimation using standard imager hardware without adding complex multi-band illumination devices.
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 device achieves high accuracy in spectral characteristic estimation by iteratively adjusting illumination characteristics and selecting adequate statistical data, resulting in images with consistent signal levels and improved signal-to-noise ratios.
Implementation Method 1
an imager configured to generate an image signal by capturing light from a subject
Data Source
AI summary
An image capturing device includes: an illuminator configured to generate illumination light having wavelength bands and an illumination characteristic; an imager configured to generate an image signal by capturing light from a subject; and a processor configured to: control the illumination characteristic; set a piece of statistical data used for estimating a spectral characteristic of the subject included in the image signal; estimate the spectral characteristic of the subject included in the image signal based on the set piece of statistical data; define an illumination characteristic of illumination light in accordance with the estimated spectral characteristic of the subject; and determine whether or not the set piece of statistical data is an adequate piece of statistical data based on whether or not an image signal generated by the imager under the illumination light having the defined illumination characteristic satisfies a criterion for achromatic color.