Information processing device and image generation method for projecting a subject image onto a virtual screen

An image generation method comprising:

• acquiring a three-dimensional space model produced from shot images of a space;
• acquiring a subject image in which a subject moves in front of a background with a single color;
• projecting the subject image onto a virtual screen moving in conformity with a movement of the subject included in the subject image;
• extracting a subject portion through application of a chroma-key process to the virtual screen on which the subject image is projected;
• generating a display image according to a viewpoint position of a user with the subject placed in the three-dimensional space model;
• and
• determining in real-time if the subject is shielded by an object in the space,
• wherein if it is determined that the subject is shielded by the object in the space, a portion of the subject portion is shielded in the display image.

A non-transitory computer readable medium having stored thereon a program for a computer, the program comprising:

• by a three-dimensional data acquisition unit, acquiring a three-dimensional space model produced from shot images of a space;
• by an image acquisition unit, acquiring a subject image in which a subject moves in front of a background with a single color;
• by a subject layer image generation unit, projecting the subject image onto a virtual screen moving in conformity with a movement of the subject included in the subject image;
• by the subject layer image generation unit, extracting a subject portion through application of a chroma-key process to the virtual screen on which the subject image is projected;
• and
• by a display processing unit, generating a display image according to a viewpoint position of a user with the subject placed in the three-dimensional space model,
• wherein a perpendicular drawn from the viewpoint position to the subject image passes through the center of the subject image during change in orientation of the subject image.