Projecting device

Abstract

A projecting device includes a projector configured to project a projection image including a content image onto a projection surface; detectors configured to detect a target position at which the content image is to be projected; an image processor configured to generate the projection image; a driver configured to change an orientation of the projector in order to change a projection position of the projection image; and a controller configured to control the image processor to set a position of the content image included in the projection image in order to minimize a difference between a display position of the content image and the target position when an optical axis of the projector is orthogonal to the projection surface, and control the driver to set the orientation of the projector in order to project the projection image at the target position on the projection surface.

What is claimed is: 
     
         1 . A projecting device comprising:
 a projector configured to project a projection image including a content image onto a projection surface;   a first detector configured to detect a target position on the projection surface at which the content image is to be projected;   an image processor configured to generate the projection image;   a driver configured to change an orientation of the projector in order to change a projection position of the projection image;   a controller configured to control the image processor and the driver,   wherein the controller controls the image processor to set a position of the content image included in the projection image in order to minimize a difference between a display position of the content image on the projection surface and the target position when the projection image is projected in a state in which the orientation of the projector is set such that an optical axis of the projector is orthogonal to the projection surface, and   the controller controls the driver to set the orientation of the projector in order to project, at the target position on the projection surface, the projection image including the content image at the set position.   
     
     
         2 . The projecting device according to  claim 1 , wherein
 the controller includes:
 a shift direction calculation unit configured to calculate, as a shift direction of the content image included in the projection image, a direction from an intersection point of the optical axis with the projection surface toward the target position in a state in which the orientation of the projector is set such that the optical axis of the projector is orthogonal to the projection surface; 
 a shift amount calculation unit configured to calculate a shift amount of the content image included in the projection image, based on the shift direction and a projection angle of view of the projector; and 
 a display position determination unit configured to determine a position of the content image included in the projection image, based on the shift direction and the shift amount. 
   
     
     
         3 . The projecting device according to  claim 2 , further comprising:
 a storage configured to store a display size of the content image,   wherein the shift amount calculation unit calculates the shift amount based on the display size.   
     
     
         4 . The projecting device according to  claim 2 , further comprising:
 a storage configured to store the content image as a binary image indicating a display portion and a non-display portion by two values,   wherein the shift amount calculation unit calculates the shift amount, based on a shape of the display portion of the binary image.   
     
     
         5 . The projecting device according to  claim 2 , further comprising:
 a second detector configured to detect the content image as a binary image indicating a display portion and a non-display portion by two values,   wherein the shift amount calculation unit calculates the shift amount based on a shape of the display portion of the binary image.   
     
     
         6 . The projecting device according to  claim 5 , wherein the second detector detects, as the non-display portion, a pixel having a predetermined color in the content image and detects, as the display portion, a pixel having a color other than the predetermined color in the content image. 
     
     
         7 . The projecting device according to  claim 1 , wherein the controller includes a projecting direction calculation unit configured to calculate an orientation of the projector, based on a difference between the target position and the display position. 
     
     
         8 . The projecting device according to  claim 1 , wherein
 the controller includes:
 a focus distance calculation unit configured to calculate a focus distance based on a projection distance from the projector to the target position and an angle formed by an optical axis of the projector and a direction of the content image seen from the projector; and 
 a focus control unit configured to control a focus of the projector based on the focus distance. 
   
     
     
         9 . The projecting device according to  claim 1 , wherein
 the controller includes:
 a focus distance calculation unit configured to calculate a focus distance based on a projection distance from the projector to the target position, a projection angle of view of the projector, and the target position in the projection image; and 
 a focus control unit configured to control a focus of the projector based on the focus distance. 
   
     
     
         10 . The projecting device according to  claim 8 , wherein
 the controller further includes a preferential position determination unit configured to determine a preferential position to be preferentially focused in the content image, and   the focus distance calculation unit calculates a focus distance based on a projection distance from the projector to the preferential position and the angle formed by the optical axis of the projector and the direction of the content image seen from the projector.   
     
     
         11 . The projecting device according to  claim 9 , wherein
 the controller further includes a preferential position determination unit configured to determine a preferential position to be preferentially focused in the content image, and   the focus distance calculation unit calculates a focus distance based on a projection distance from the projector to the preferential position, the projection angle of view of the projector, and the preferential position in the projection image.   
     
     
         12 . The projecting device according to  claim 10 , further comprising:
 a storage configured to previously store a position at which focusing is preferentially performed in the content image,   wherein the preferential position determination unit determines the position stored in the storage as the preferential position.   
     
     
         13 . The projecting device according to  claim 10 , further comprising:
 a third detector configured to detect a position gazed in the content image by a gazer,   wherein the preferential position determination unit determines a position detected by the third detector as the preferential position.