Method and apparatus for detecting human body in a vehicle
First Claim
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1. A human body detection method for detecting a human body in a vehicle, comprising:
- detecting chest motion associated with breathing and obtaining a breathing motion signal representing said chest motion in the form of an electrical signal;
detecting times at which specific points occur in a waveform of said breathing motion signal; and
detecting the presence of a human body in said vehicle when time interval between said specific points is within a predetermined range,wherein said specific points in the waveform of said breathing motion signal are peaks on a positive or negative side of the waveform of said breathing motion signal, andwherein the times (T(n)) at which said peaks occur are detected to obtain a peak-to-peak time interval (Δ
T(n)),a difference (Δ
t(n)) between peak-to-peak time intervals is obtained from said peak-to-peak time interval (Δ
T(n)), andthe presence of a human body is detected in said vehicle when the difference (Δ
t(n)) between said peak-to-peak time intervals is smaller than a predetermined value (Tth).
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Abstract
Chest motion associated with breathing is detected to obtain a breathing motion signal representing the chest motion in the form of an electrical signal; then, the times at which specific points occur in the waveform of the breathing motion signal are detected and, when the time interval between the specific points is within a predetermined range, the presence of a human body is detected in a vehicle.
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Citations
19 Claims
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1. A human body detection method for detecting a human body in a vehicle, comprising:
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detecting chest motion associated with breathing and obtaining a breathing motion signal representing said chest motion in the form of an electrical signal; detecting times at which specific points occur in a waveform of said breathing motion signal; and detecting the presence of a human body in said vehicle when time interval between said specific points is within a predetermined range, wherein said specific points in the waveform of said breathing motion signal are peaks on a positive or negative side of the waveform of said breathing motion signal, and wherein the times (T(n)) at which said peaks occur are detected to obtain a peak-to-peak time interval (Δ
T(n)),a difference (Δ
t(n)) between peak-to-peak time intervals is obtained from said peak-to-peak time interval (Δ
T(n)), andthe presence of a human body is detected in said vehicle when the difference (Δ
t(n)) between said peak-to-peak time intervals is smaller than a predetermined value (Tth). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A human body detection method for detecting a human body in a vehicle, comprising:
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detecting chest motion associated with breathing and obtaining a breathing motion signal representing said chest motion in the form of an electrical signal; detecting times at which specific points occur in a waveform of said breathing motion signal; and detecting the presence of a human body in said vehicle when time interval between said specific points is within a predetermined range, wherein said specific points in the waveform of said breathing motion signal are rising or falling points of the waveform of said breathing motion signal, and wherein the times (Tu(n)) at which said rising or falling points occur are detected to obtain a time interval (Δ
Tu(n)) between said rising or falling points,a difference (Δ
tu(n)) between time intervals is obtained from said time interval (Δ
Tu(n)),the number of times that the difference (Δ
tu(n)) between said time intervals is smaller than a predetermined value (Tuth) is counted by a counter, andwhen the number of times counted is larger than a predetermined number (Cth), the presence of a human body is detected in said vehicle.
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13. A human body detection method for detecting a human body in a vehicle, comprising:
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detecting chest motion associated with breathing and obtaining a breathing motion signal representing said chest motion in the form of an electrical signal; detecting times at which specific points occur in a waveform of said breathing motion signal; and detecting the presence of a human body in said vehicle when time interval between said specific points is within a predetermined range, wherein said specific points in the waveform of said breathing motion signal are points defining a waveform width of said breathing motion signal, and wherein time interval (Δ
Tud(n)) of said waveform width is detected, a difference (Δ
tud(n)) between waveform width time intervals is obtained from said waveform width time interval (Δ
Tud(n)), the number of times that the difference (Δ
tud(n)) between said waveform width time intervals is smaller than a predetermined value (Tudth) is counted by a counter, and when the number of times counted is larger than a predetermined number (Cth), the presence of a human body is detected in said vehicle.
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14. A human body detection method for detecting a human body in a vehicle, comprising:
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detecting chest motion associated with breathing and obtaining a breathing motion signal representing said chest motion in the form of an electrical signal; detecting times at which specific points occur in a waveform of said breathing motion signal; and detecting the presence of a human body in said vehicle when time interval between said specific points is within a predetermined range, wherein said specific points in the waveform of said breathing motion signal are positive and negative peaks of the waveform of said breathing motion signal, and wherein the times at which said positive and negative peaks occur are detected, the ratio of the time interval from said positive peak to said negative peak or from said negative peak to said positive peak to the time interval from said positive peak to the next positive peak is obtained, the number of times that said ratio is within a predetermined range is counted by a counter, and when the number of times counted is larger than a predetermined number (Cth), the presence of a human body is detected in said vehicle. - View Dependent Claims (15, 16, 17)
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18. A human body detection apparatus for detecting a human body in a vehicle, comprising:
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means for detecting chest motion associated with breathing and obtaining a breathing motion signal representing said chest motion in the form of an electrical signal; means for detecting times at which specific points occur in a waveform of said breathing motion signal; and means for detecting the presence of a human body in said vehicle on the basis of the detected times, wherein said specific points in the waveform of said breathing motion signal are peaks on a positive or negative side of the waveform of said breathing motion signal; and said means for detecting times detect the times (T(n)) at which peaks occur to obtain a peak-to-peak time interval (Δ
T(n)), andsaid means for detecting the presence of a human body obtain a difference (Δ
t(n)) between peak-to-peak time intervals from said peak-to-peak time interval (Δ
T(n)), and detect the presence of a human body in said vehicle when the difference (Δ
t(n)) between said peak-to-peak time intervals is smaller than a predetermined value (Tth).
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19. A vehicle providing a human body detection apparatus comprising:
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means for detecting chest motion associated with breathing and obtaining a breathing motion signal representing said chest motion in the form of an electrical signal; means for detecting times at which specific points occur in a waveform of said breathing motion signal; and means for detecting the presence of a human body in said vehicle on the basis of the detected times, wherein said specific points in the waveform of said breathing motion signal are peaks on a positive or negative side of the waveform of said breathing motion signal; and said means for detecting times detect the times (T(n)) at which peaks occur to obtain a peak-to-peak time interval (Δ
T(n)), andsaid means for detecting the presence of a human body obtain a difference (Δ
t(n)) between peak-to-peak time intervals from said peak-to-peak time interval (Δ
T(n)), and detect the presence of a human body in said vehicle when the difference (Δ
t(n)) between said peak-to-peak time intervals is smaller than a predetermined value (Tth).
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Specification