Gait waveform feature extracting method and individual identification system
First Claim
1. A gait waveform feature extracting method comprising:
- specifying a one-step waveform from a portion of a digital signal, said digital signal corresponding to an electric field displacement formed on a body of a subject in accordance with a two-leg-walking movement of said subject, said specifying includingassociating as an index of said one-step waveform a peak amplitude in a predetermined frequency band, said peak amplitude corresponding to a state where approximately a whole bottom surface of a first foot of said subject is in contact with a walking surface and a toe of a second foot of said subject is just after leaving the walking surface;
extracting features of said one-step waveform after said one-step waveform is specified in said specifying step; and
identifying said subject based on said features extracted by said extracting.
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Abstract
A gait waveform feature extracting method and an individual identification system extract features of the gait waveform. A one-step waveform corresponding to one step of a walking movement is specified using, as an index, a peak amplitude corresponding to a state where substantially a whole bottom surface of one foot is in contact with the ground and a toe of the other foot is just after leaving the ground among the electric field displacement formed on the human body in accordance with the human body'"'"'s walking movements. Based on the specified one-step waveform, the features of the one-step waveform are extracted, so that the peak amplitude appears without influence from electric-charge interference between the right and left legs. Accordingly, the one-step waveform reflects the actual one step of the walking movement, and therefore, the features of the one-step waveform can be precisely extracted.
5 Citations
20 Claims
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1. A gait waveform feature extracting method comprising:
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specifying a one-step waveform from a portion of a digital signal, said digital signal corresponding to an electric field displacement formed on a body of a subject in accordance with a two-leg-walking movement of said subject, said specifying including associating as an index of said one-step waveform a peak amplitude in a predetermined frequency band, said peak amplitude corresponding to a state where approximately a whole bottom surface of a first foot of said subject is in contact with a walking surface and a toe of a second foot of said subject is just after leaving the walking surface; extracting features of said one-step waveform after said one-step waveform is specified in said specifying step; and identifying said subject based on said features extracted by said extracting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An individual identification system comprising:
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an electric field displacement detector configured to detect an electric field displacement formed on a body of a subject in accordance with a two-leg-walking movement of said subject and produce a signal that corresponds with the electric field displacement; and a processor configured to identify from said signal an individual using, as an index, a peak amplitude of said signal, in a predetermined frequency band, that corresponds to a state where approximately a whole bottom surface of a first foot of said subject is in contact with a walking surface and a toe of a second foot is just after leaving the walking surface. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An individual identification system comprising:
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means for detecting an electric field displacement formed on a subject in accordance with a two-leg-walking movement of said subject to generate a waveform; and means for comparing said waveform with predetermined waveforms associated with different individuals so as to identify a predetermined individual based on said electric field displacement.
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Specification