Electromagnetic-wave detection apparatus and distance-measurement apparatus
Provided are an electromagnetic-wave detection apparatus and a distance-measurement apparatus capable of accurately detecting the position of a subject. An electromagnetic-wave detection apparatus ( 10 ) includes a first detection unit ( 20 ) configured to detect a reflected wave that is an electromagnetic wave radiated in multiple directions in a space in which an object (ob) is present and reflected by the object (ob), an image-information acquisition unit ( 141 ) configured to acquire image information of the space, and a light-reception control unit ( 144 ) configured to perform control such that the time difference between the timing at which the image-information acquisition unit ( 141 ) acquires the image information and the timing at which the electromagnetic wave is radiated onto a predetermined tracking target included in the object is reduced.
1 . An electromagnetic-wave detection apparatus comprising:
a first detector configured to detect a reflected wave that is an electromagnetic wave radiated in multiple directions in a space in which an object is present and reflected by the object; and
a controller configured to acquire image information of the space and perform control on the electromagnetic wave such that a time difference between a timing at which the controller acquires the image information and a timing at which the electromagnetic wave is radiated onto a predetermined tracking target included in the object is reduced.
2 . The electromagnetic-wave detection apparatus according to claim 1 , further comprising:
an electromatic wave transmitter configured to radiate an electromagnetic wave into the space; and
wherein the controller is further configured to
control a direction in which the electromatic wave transmitter radiates the electromagnetic wave into the space and a timing at which the electromatic wave transmitter radiates the electromagnetic wave into the space,
calculate a tracking-target radiation timing that is a timing at which the electromatic wave transmitter radiates the electromagnetic wave in a direction toward the tracking target present in the space, and
acquire the image information based on the tracking-target radiation timing.
3 . The electromagnetic-wave detection apparatus according to claim 2 ,
wherein the controller is configured to
acquire the image information at a predetermined timing,
reduce a time difference between a timing at which the controller acquires the image information and the tracking-target radiation timing by delaying the predetermined timing, and
wherein the predetermined timing that is not delayed by the controller is a timing that is set such that the image information is acquired at a fixed rate.
4 . The electromagnetic-wave detection apparatus according to claim 1 , wherein
the controller is further configured to determine the tracking target from the object based on the image information acquired by the controller.
5 . The electromagnetic-wave detection apparatus according to claim 1 ,
wherein the first detector is configured to cause the electromagnetic wave to scan the tracking target while changing a direction in which the electromagnetic wave is radiated, and
wherein a time taken for the controller to acquire the image information for one frame is shorter than a time taken for the first detector to detect the reflected wave for one frame.
6 . The electromagnetic-wave detection apparatus according to claim 1 ,
wherein a predetermined position in the image information and an optical axis of the reflected wave reflected at the predetermined position and detected by the first detector match each other.
7 . The electromagnetic-wave detection apparatus according to claim 6 , further comprising:
a second detector configured to detect a light and output the image information; and
a separator configured to separate electromagnetic waves including the reflected wave such that the reflected wave travels toward the first detector and such that the light travels toward the second detector.
8 . The electromagnetic-wave detection apparatus according to claim 1 , wherein
the controller is further configured to generate positional information regarding the tracking target based on detection of the reflected wave and a position of the tracking target in the image information.
9 . The electromagnetic-wave detection apparatus according to claim 8 , wherein
the controller is further configured to calculate a moving speed of the tracking target based on positional information items regarding the tracking target detected at different timings.
10 . A distance-measurement apparatus comprising:
a first detector configured to detect a reflected wave that is an electromagnetic wave radiated in multiple directions in a space in which an object is present and reflected by the object; and
a controller configured to acquire image information of the space, perform control on the electromagnetic wave such that a time difference between a timing at which the controller acquires the image information and a timing at which the electromagnetic wave is radiated onto a predetermined tracking target included in the object is reduced, and calculate a distance to the object based on detection information obtained by the first detector.