Patent ID: 7511731

Claim:
An image photographing apparatus comprising: an image photographing unit adapted to photograph an image; a position/orientation measurement unit adapted to measure position and orientation of said image photographing unit; a reconstruction viewpoint position and orientation setting unit adapted to set a viewpoint position and orientation of a reconstruction image based on the position and orientation measured by said position/orientation measurement unit; a reconstruction unit adapted to reconstruct an image according to the viewpoint position set by said reconstruction viewpoint position and orientation setting unit, by using beam information included in the image photographed by said image photographing unit; and a display adapted to display the photographed image, wherein said reconstruction viewpoint position and orientation setting unit superposes a first optical axis that passes through a reconstruction viewpoint position at a time when said image photographing apparatus is disposed at a first point, on the photographed image displayed on said display at a time when said image photographing apparatus is disposed at a second point, and superposes a mark indicating a second optical axis at the second point on the photographed image, said reconstruction viewpoint position and orientation setting unit setting the reconstruction viewpoint position of the reconstruction image by using a first measurement position and orientation measured at the first point by said position/orientation measurement unit and a second measurement position and orientation measured at the second point by said position/orientation measurement unit, and said reconstruction viewpoint position and orientation setting unit setting the orientation of the reconstruction image according to a user's instruction.