EYEBLINK DETECTION DEVICE
First Claim
1. An eyeblink detection device comprising:
- an eye potential measurement unit configured to measure an eye potential of a subject;
an eye potential differential value data generation unit configured to generate time-series data on differential values of the eye potential;
a frequency characteristic value determination unit configured to determine a frequency characteristic value from the time-series data on the eye potential differential values, the frequency characteristic value representing a frequency characteristic of the eye potential differential values;
a threshold setting unit configured to set a threshold coefficient based on the frequency characteristic value of the eye potential differential values and to set an upper threshold and a lower threshold based on a number obtained by multiplying a standard deviation of the differential values in the time-series data on the eye potential differential values by the threshold coefficient, the upper threshold and the lower threshold being used for detecting an eyeblink waveform in the time-series data on the eye potential differential values;
an eyeblink waveform detection unit configured to detect a change in the eye potential differential values as the eyeblink waveform, the change occurring in the time-series data either when the eye potential differential value becomes larger than the upper threshold and, after that, changes from the upper threshold to the lower threshold within a predetermined time or when the eye potential differential value becomes smaller than the lower threshold and, after that, changes from the lower threshold to the upper threshold within the predetermined time; and
a display unit that outputs an eyeblink detection result based on the eyeblink waveform.
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Accused Products
Abstract
A device disclosure includes a unit that measures an eye potential; and a unit that sets a threshold coefficient based on a frequency characteristic value of eye potential differential values and sets an upper threshold and a lower threshold based on a number obtained by multiplying a standard deviation of the eye potential differential values by the threshold coefficient, and detects a change in the eye potential differential values as the eyeblink waveform wherein the change occurs in the time-series data on the eye potential differential values either when the eye potential differential value becomes larger than the upper threshold and, after that, changes from the upper threshold to the lower threshold within a predetermined time or when the eye potential differential value becomes smaller than the lower threshold and, after that, changes from the lower threshold to the upper threshold within the predetermined time.
23 Citations
9 Claims
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1. An eyeblink detection device comprising:
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an eye potential measurement unit configured to measure an eye potential of a subject; an eye potential differential value data generation unit configured to generate time-series data on differential values of the eye potential; a frequency characteristic value determination unit configured to determine a frequency characteristic value from the time-series data on the eye potential differential values, the frequency characteristic value representing a frequency characteristic of the eye potential differential values; a threshold setting unit configured to set a threshold coefficient based on the frequency characteristic value of the eye potential differential values and to set an upper threshold and a lower threshold based on a number obtained by multiplying a standard deviation of the differential values in the time-series data on the eye potential differential values by the threshold coefficient, the upper threshold and the lower threshold being used for detecting an eyeblink waveform in the time-series data on the eye potential differential values; an eyeblink waveform detection unit configured to detect a change in the eye potential differential values as the eyeblink waveform, the change occurring in the time-series data either when the eye potential differential value becomes larger than the upper threshold and, after that, changes from the upper threshold to the lower threshold within a predetermined time or when the eye potential differential value becomes smaller than the lower threshold and, after that, changes from the lower threshold to the upper threshold within the predetermined time; and a display unit that outputs an eyeblink detection result based on the eyeblink waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An eyeblink detection device comprising:
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an eye potential measurement unit that measures an eye potential of a subject; and a signal processing device that generates time-series data on differential values of the eye potential, determines a frequency characteristic value from the time-series data, the frequency characteristic value representing a frequency characteristic of the eye potential differential values, sets a threshold coefficient based on the frequency characteristic value, sets an upper threshold and a lower threshold based on a number obtained by multiplying a standard deviation of the differential values by the threshold coefficient, detects a change in the differential values as an eyeblink waveform, the change occurring in the time-series data either when the differential value becomes larger than the upper threshold and, after that, changes from the upper threshold to the lower threshold within a predetermined time or when the differential value becomes smaller than the lower threshold and, after that, changes from the lower threshold to the upper threshold within the predetermined time, and outputs an eyeblink detection result based on the eyeblink waveform to a display unit.
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Specification