Patent ID: 7312795

Claim:
An image display method of superimposing image data of virtual space on image data of real space at an arbitrary viewpoint and exhibiting a superimposed image to a viewer, comprising: an image sensing step of capturing, by an image sensing device, image data of real space in which a prototype made based on three-dimensional CAD data exists; a tracking step of tracking positions and orientations of the image sensing device and the prototype, and acquiring position/orientation data indicative of the position and orientation of the prototype in the image data captured in said image sensing step; a synthesizing step of rendering a three-dimensional computer graphic image corresponding to the prototype based on the position/orientation data and the three-dimensional CAD data so as to overlap the prototype in the image captured in said image sensing step; and an area extracting step of extracting an area, having predetermined color data, from the image of a real space obtained in said image sensing step, wherein, in said synthesizing step, rendering the three-dimensional computer graphic image is prohibited in the area extracted in said area extracting step.