Dynamic Light Control for Expanded Colorimetric Measurement
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Solution Overview
Problem
Existing colorimetric methods struggle to accurately distinguish between different levels of components in blood due to limited measurement ranges of RGB values in digital images, particularly in the context of blood glucose measurement using smartphone cameras.
Innovation Solution
The method involves controlling the brightness of light emitted during the reaction between a sample and a reagent by adjusting the lighting unit, aperture, or sensitivity of the camera to expand the measurement range of RGB values, allowing for clearer differentiation between blood glucose levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard lighting conditions are used for colorimetric measurement, then the measurement process is simple, but the measurement range of RGB values is limited and accuracy is reduced
Solution Approach 1:
The patent implements dynamic light brightness control by adjusting the illumination unit's brightness to different levels (first brightness and second brightness) based on the reaction progress. The controller dynamically changes lighting conditions during the colorimetric reaction process, allowing the system to adapt to changing color intensities and expand the measurable RGB value range beyond static lighting limitations.
Solution Approach 2:
The patent changes the lighting parameter (brightness level) from a fixed state to a variable state with at least two distinct brightness levels. By controlling the illumination unit to emit light at different brightness levels at different times during the reaction, the system expands the measurement range of RGB values captured by the camera, thereby improving measurement accuracy for various glucose concentrations.
2Measurement precision
If light brightness is increased to improve measurement range, then RGB value differentiation improves, but light control complexity increases
Solution Approach 1:
The patent employs periodic or sequential lighting actions where the illumination unit alternates between different brightness levels during the measurement process. The controller manages the timing of brightness changes to capture images at optimal illumination levels for different reaction stages, enabling better RGB differentiation without requiring continuously variable light control.
3Measurement precision
If multiple brightness levels are used to expand measurement range, then measurement accuracy improves, but control complexity increases
Solution Approach 1:
The system uses the smartphone's existing camera and processing capabilities to manage the multi-brightness measurement process. The controller (integrated into the smartphone system) automatically manages the sequencing of different brightness levels and the corresponding image capture, eliminating the need for external complex control equipment and leveraging the device's inherent computational resources.
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
This approach enhances the accuracy and reliability of blood glucose measurements by expanding the measurement range of RGB values, improving the ability to distinguish between different glucose levels.
Implementation Method 1
a lighting unit configured to emit light with a brightness
Implementation Method 2
a camera configured to capture the reaction... measures an amount of blue in an image captured by the camera
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3~4
AI summary
The present specification discloses an apparatus and method for controlling the brightness of light to calculate more accurate figures as compared to when the level of a component in blood is measured through a change in color of a reaction reagent. A light control apparatus for a colorimetric method according to the present specification can control light to have a second brightness different from a first brightness while a camera captures an image of the reaction of a reagent and a sample. Thus, a wider range of measurement than conventional measurement ranges is possible.