Position detection apparatus and position detection method

Abstract

A position detection apparatus includes a projection unit that projects an image, a radiation unit that radiates light, a detection unit that detects reflected light of the light radiated from the radiation unit, and an output control unit that performs control for outputting information corresponding to a detection position of the reflected light based on a detection result from the detection unit when a radiation direction of the light radiated from the radiation unit is adjusted.

What is claimed is: 
     
         1 . A position detection apparatus comprising:
 a projection unit that projects an image;   a radiation unit that radiates light;   a detection unit that detects reflected light of the light radiated from the radiation unit; and   an output control unit that performs control for outputting information corresponding to a detection position of the reflected light based on a detection result from the detection unit when a radiation direction of the light radiated from the radiation unit is adjusted.   
     
     
         2 . The position detection apparatus according to  claim 1 , further comprising
 a change unit that changes the radiation direction of the light radiated from the radiation unit.   
     
     
         3 . The position detection apparatus according to  claim 1 ,
 wherein the output control unit controls the projection unit to project an image including a first mark onto a position corresponding to the detection position of the reflected light.   
     
     
         4 . The position detection apparatus according to  claim 3 ,
 wherein the output control unit controls the projection unit to project an image including a second mark onto a target position for the first mark.   
     
     
         5 . The position detection apparatus according to  claim 4 ,
 wherein the output control unit changes the shape of either or both of the first mark and the second mark when the first mark and the second mark have a predetermined positional relationship, but does not in other cases.   
     
     
         6 . The position detection apparatus according to  claim 4 ,
 wherein the output control unit changes the color of either or both of the first mark and the second mark when the first mark and the second mark have a predetermined positional relationship, but does not in other cases.   
     
     
         7 . The position detection apparatus according to  claim 1 ,
 wherein the output control unit controls the projection unit to project an image including information indicating a positional state when the detection position of the reflected light is a predetermined position.   
     
     
         8 . The position detection apparatus according to  claim 1 ,
 wherein the output control unit performs control for outputting voice information indicating a positional state when the detection position of the reflected light is a predetermined position.   
     
     
         9 . A position detection method comprising:
 projecting an image;   radiating light;   detecting reflected light of the light; and   performing control for outputting information corresponding to a detection position of the reflected light based on the detected result when adjusting a radiation direction of the light.   
     
     
         10 . A position detection apparatus comprising:
 a projection unit that projects an image on a projection surface;   a radiation unit that radiates a planar light curtain along the projection surface;   a detection unit that detects reflected light obtained by reflection of the light curtain from a reflector installed on the projection surface to adjust a radiation direction of the light curtain; and   an output control unit that performs control for outputting information corresponding to a detection position of the reflected light based on a detection result from the detection unit.   
     
     
         11 . The position detection apparatus according to  claim 10 , further comprising
 an installation position presenting unit that causes the projection unit to project a mark indicating a position for the reflector to be installed on the projection surface.   
     
     
         12 . The position detection apparatus according to  claim 11 , further comprising
 a change unit that turns the light curtain using a predetermined straight line extending along the light curtain through the radiation unit as a rotation axis,   wherein the installation position presenting unit projects the mark to install the reflector on the predetermined straight line.