Motion sickness estimation device, motion sickness prevention device, and motion sickness estimation method
A motion sickness estimation device includes: a line-of-sight oscillation detector to detect oscillation of a line of sight of an occupant by using an imaging device; an object oscillation detector to detect oscillation of an object located in the line of sight; an oscillation comparator to calculate an oscillation difference from the oscillation of the line of sight and the oscillation of the object; and a motion sickness determiner to determine, on a basis of the oscillation difference, whether the occupant is in a motion sickness state.
1. A motion sickness estimation device comprising:
a line-of-sight oscillation detector to detect oscillation of a line of sight of an occupant by using an imaging device;
an object oscillation detector to detect oscillation of an object located in the line of sight;
an oscillation comparator to calculate an oscillation difference from the oscillation of the line of sight and the oscillation of the object; and
a motion sickness determiner to determine, on a basis of the oscillation difference, whether the occupant is in a motion sickness state.
2. The motion sickness estimation device of claim 1 , wherein the object oscillation detector detects the oscillation of the object by measuring an acceleration of the object.
3. The motion sickness estimation device of claim 1 , wherein the object oscillation detector detects the oscillation of the object by means of an imaging device.
4. The motion sickness estimation device of claim 1 , wherein the motion sickness determiner uses a time integral value of the oscillation difference in the determination.
5. The motion sickness estimation device of claim 1 , further comprising a warning presenter to issue a warning when the motion sickness determiner determines that the occupant has a sign of motion sickness.
6. A motion sickness prevention device comprising:
the motion sickness estimation device of claim 1 ; and
a conveyance controller,
wherein the conveyance controller controls, on a basis of a determination result of the motion sickness determiner, a state of a conveyance in which the occupant is riding to reduce the oscillation difference.
7. A motion sickness estimation device comprising:
a line-of-sight oscillation detector to detect oscillation of a line of sight of an occupant by using an imaging device;
a velocity measurer to measure a velocity of a conveyance in which the occupant is riding;
an outside imager to capture an outside of the conveyance and measure a distance between the conveyance and an object located in the outside;
an object oscillation detector to detect, when the object forms a pattern in which the object periodically repeats with respect to a traveling direction in which the object is captured by the outside imager, a period at which the object repeats with respect to the traveling direction, as oscillation of the object, from the velocity and the distance;
an oscillation comparator to calculate an oscillation difference from the oscillation of the line of sight and the oscillation of the object; and
a motion sickness determiner to determine, on a basis of the oscillation difference, whether the occupant is in a motion sickness state.
8. A motion sickness estimation method comprising:
detecting oscillation of a line of sight of an occupant by using an imaging device;
detecting oscillation of an object located in the line of sight;
calculating an oscillation difference from the oscillation of the line of sight and the oscillation of the object; and
determining, on a basis of the oscillation difference, whether the occupant is in a motion sickness state.