Projector and control method of projector

Abstract

In one embodiment, a projector may include a focus adjusting unit, an adjustment image projecting unit, an imaging unit, and a condition indicating unit. The focus adjusting unit adjusts a focus of a projection light according to a manual operation. The adjustment image projecting unit projects an adjustment image containing a portion representing a predetermined pattern by the projection light. The imaging unit shoots a projection surface to which the adjustment image is projected. The specifying unit specifies a focusing condition of the focus on the projection surface by analyzing an image data that is created by the imaging unit. The condition indicating unit displays the specified focusing condition. The adjustment image includes a first portion that includes a bar graph representing the specified focusing condition, and a second portion that represents the predetermined pattern.

What is claimed is: 
     
         1 . A projector which projects projection light representing an image onto a projection surface, comprising:
 a focus adjusting unit which adjusts a focus of the projection light according to a manual operation;   an adjustment image projecting unit which projects an adjustment image containing a portion representing a predetermined pattern by the projection light;   an imaging unit which shoots the projection surface to which the adjustment image is projected;   a specifying unit which specifies a focusing condition of the focus on the projection surface by analyzing an image data that is created by the imaging unit; and   a condition indicating unit which displays the specified focusing condition,   wherein the adjustment image includes:
 a first portion that includes a bar graph representing the specified focusing condition, and 
 a second portion that represents the predetermined pattern. 
   
     
     
         2 . The projector according to  claim 1 , wherein the first portion lies below the second portion. 
     
     
         3 . The projector according to  claim 1 , wherein the adjustment image further includes a third portion that numerically represents the specified focusing condition. 
     
     
         4 . The projector according to  claim 1 , wherein:
 the specifying unit calculates an index showing the focusing condition and a variable with adjustment of the focus by analyzing the image data;   the condition indicating unit indicates the index;   the imaging unit repeats shooting the image;   the specifying unit calculates the index based on each of the shot images; and   the condition indicating unit repeatedly updates the index to be indicated according to the calculated index.   
     
     
         5 . The projector according to  claim 4 , wherein the index shows:
 (a) an intensity of a predetermined color component represented by the image data and obtained in a predetermined range of spatial frequency, and   (b) a degree of contrast in the image data.   
     
     
         6 . The projector according to  claim 1 , wherein:
 the specifying unit specifies:
 (a) a first position of the projection surface by analyzing the image data, and 
 (b) a second position of the focus associated with a current adjustment setting of the focus adjusting unit; 
   the condition indicating unit indicates a distance between the first position and the second position;   the specifying unit repeatedly specifies the second position; and   the condition indicating unit repeatedly updates the distance to be indicated according to the specified second position.   
     
     
         7 . The projector according to  claim 6 , wherein the condition indicating unit further indicates which of the first position and the second position is closer to the projector. 
     
     
         8 . The projector according to  claim 1 , wherein the adjustment image projecting unit projects the adjustment image in response to manual operation of the focus adjusting unit. 
     
     
         9 . The projector according to  claim 1 , wherein the predetermined pattern contains a first region and a second region alternately disposed and having different intensities of a predetermined color component. 
     
     
         10 . The projector according to  claim 1 , further comprising:
 an indication device,   wherein the condition indicating unit indicates the focusing condition on the indication device.   
     
     
         11 . The projector according to  claim 8  further comprising:
 a detection unit which detects a movement of the focus adjusting unit, 
 wherein the adjustment image projecting unit stops projecting the adjustment image if the detection unit detects no movement during a passage of a predetermined time after a last manual operation for the focus adjusting unit. 
 
     
     
         12 . A method for controlling a projector which projects a projection light representing an image onto a projection surface and includes a focus adjusting unit for adjusting a focus of the projection light according to a manual operation, comprising:
 projecting an adjustment image containing a portion representing a predetermined pattern by the projection light;   shooting the projection surface to which the adjustment image is projected to produce an image data;   specifying a focusing condition of the focus on the projection surface by analyzing the image data; and   displaying the specified focusing condition,   wherein the adjustment image includes:
 a first portion that includes a bar graph representing the specified focusing condition, and 
 a second portion that represents the predetermined pattern. 
   
     
     
         13 . The method according to  claim 12 , further comprising:
 determining whether an ending condition to cease projecting the adjustment condition is satisfied; and   stopping the projection of the adjustment image when the ending condition is satisfied.   
     
     
         14 . The method according to  claim 13 , wherein the ending condition is a passage of a predetermined time after a last manual operation for the focus adjusting unit.