Arousal Detection Using Ocular Potential Normalization
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Solution Overview
Problem
Conventional methods for determining the degree of arousal using ocular potential peak width and height are prone to errors due to variations among and between individuals, caused by differences in blinking length and strength.
Innovation Solution
An information processing system that includes eyewear equipped with a three-axis acceleration sensor, angular velocity sensor, and biological electrodes, which calculates the degree of arousal by analyzing ocular potential signals and head movement information, using a histogram-based approach to reduce errors by normalizing the ocular potential distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ocular potential peak width and height are used to determine degree of arousal, then arousal level can be assessed, but errors occur due to variations in blinking among and between individuals
Solution Approach 1:
The patent transforms the ocular potential signal from time-domain parameters (peak width and height) to frequency-domain parameters (power spectrum density). This parameter transformation allows extraction of arousal-related features that are less sensitive to individual blinking variations, thereby improving measurement precision and reliability simultaneously
Solution Approach 2:
The patent introduces a new dimension of analysis by applying Fast Fourier Transform to convert the ocular potential signal into the frequency domain. This dimensional transformation enables the extraction of spectral features that capture arousal states more reliably than traditional time-domain parameters, reducing errors caused by inter-individual blinking variations
Data Source
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AI summary
To reduce errors in determining a degree of arousal due to variations in blinking among an individual or between individuals. To execute the steps of: acquiring first biological information related to an ocular potential of a user from a processing device worn by the user; and calculating a degree of arousal of the user based on a distance between a projection axis parallel to an equal degree of arousal line and a point where the first biological information is plotted in a coordinate space where a height and width are the axes for an ocular potential peak.