Patent ID: 8179395

Claim:
An image special effect apparatus for adding, to image information concerning an input image, an illumination effect using light from a light source when viewed from an arbitrary eye point in a face having a curved face, and outputting a video signal provided by mapping the image information to the face, the image special effect apparatus comprising: a normal vector generation section for generating a normal vector indicating a vector in a normal direction at a position of the face based on rectangular coordinate data indicating the positions of a horizontal coordinate and a vertical coordinate of the face and the shape of the face; an illumination effect generation section for generating reflectivity of the light in a direction of the eye point by calculation of A(2(LN)N−2L)V where N represents the normal vector, L represents a light source direction unit vector indicating a unit vector in a direction of the light source, V represents an eye point vector indicating a vector in the eye point direction, and A represents an arbitrary value; and an image information creation section for creating the image information based on the image and the reflectivity.