Electrooculogram Correction for Eye Fatigue
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Solution Overview
Problem
Conventional methods for determining eye fatigue while viewing stereoscopic video face challenges due to impedance fluctuations between electrodes and the skin, leading to frequent suspension of electrooculogram measurements, especially when the viewer adjusts three-dimensional eyeglasses or changes position.
Innovation Solution
An eye fatigue determination apparatus that includes an electrooculogram obtainment unit, an impedance obtainment unit, an electrooculogram correction unit, and a fatigue determination unit, which measures and corrects electrooculograms based on impedance fluctuations to accurately determine eye fatigue even during unstable impedance periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrooculogram measurement is performed using an electrode mounted on three-dimensional eyeglasses, then eye fatigue can be determined based on eye movement state, but the impedance between the electrode and skin changes due to sweating and electrode displacement, causing measurement suspension
Solution Approach 1:
The system performs preliminary impedance measurement when the viewer puts on the eyeglasses, before actual electrooculogram measurement begins. This advance action allows the system to detect and handle impedance issues before they interfere with fatigue determination, resolving the contradiction by preparing measurement conditions in advance
Solution Approach 2:
The system continuously monitors impedance changes during viewing and uses this feedback to determine when measurement suspension is necessary. By implementing feedback control, the system maintains measurement accuracy while adapting to impedance fluctuations caused by sweating and displacement, thus resolving the reliability-precision contradiction
2Reliability
If impedance measurement frequency is increased to detect electrode displacement, then electrode contact state can be monitored better, but data loss occurs during sequential potential waveform recording
Solution Approach 1:
The system segments the measurement process into distinct impedance measurement phases and electrooculogram measurement phases. By separating these functions temporally, the system can perform impedance checks without interrupting or losing electrooculogram data, resolving the contradiction between monitoring reliability and information preservation
Solution Approach 2:
The system uses impedance measurement as an intermediary indicator to infer electrode contact state, rather than directly measuring contact quality. This indirect approach allows monitoring of electrode stability without disrupting the electrooculogram recording process, eliminating data loss while maintaining monitoring reliability
3Measurement precision
If electrooculogram measurement is suspended when impedance fluctuates, then measurement accuracy is maintained, but eye fatigue determination cannot be performed frequently enough
Solution Approach 1:
The system performs preliminary impedance assessment at the start of viewing and uses this information to determine the appropriate measurement strategy. By acting in advance, the system can maintain measurement accuracy while enabling more frequent fatigue determinations, resolving the productivity-precision contradiction
Solution Approach 2:
The system changes the measurement parameters dynamically based on impedance conditions. When impedance is stable, the system performs frequent electrooculogram measurements for high productivity. When impedance fluctuates, the system adjusts to maintain accuracy through corrected measurements, thus resolving the contradiction between frequency and accuracy
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
Enables accurate determination of eye fatigue during stereoscopic video viewing by correcting electrooculogram measurements for impedance fluctuations, allowing for reliable assessment even in early stages of viewing when the contact resistance is unstable.
Implementation Method 1
an electrooculogram indicating a potential measured using an electrode placed near an eye of a viewer
Implementation Method 2
an impedance between the electrode and the viewer's skin at a position where the electrode is placed
Data Source
AI summary
An eye fatigue determination apparatus includes: an electrooculogram obtainment unit that obtains an electrooculogram indicating a potential measured using an electrode placed near an eye of a viewer who is viewing video content, the electrooculogram being measured in a plurality of predetermined time sections during display of the video content; an impedance obtainment unit that obtains an impedance between the electrode and the viewer's skin at a position where the electrode is placed, the impedance being measured in the plurality of predetermined time sections; an electrooculogram correction unit that corrects the electrooculogram measured in the plurality of predetermined time sections and obtained by the electrooculogram obtainment unit, based on the impedance measured in the plurality of predetermined time sections and obtained by the impedance obtainment unit; and a fatigue determination unit that determines fatigue of the viewer's eye, based on the electrooculogram corrected by the electrooculogram correction unit.