Abstract: The image capturing part 201 captures a ball in flight with a camera continuously. The image corresponding part 203 generates a first registered ball image obtained by making a size of a first ball image in a first capturing image captured first correspond to a size of a second ball image in a second capturing image captured second. The 3D model constructing part 204constructs a 3D model of the first registered ball image obtained by converting a camera coordinate system of the generated first registered ball image into a world coordinate system. The virtual rotating part 205 rotates virtually the constructed 3D model of the first registered ball image by using a rotation parameter estimated in advance and rotation matrix information.

Abstract: The ball existence determining part 301 determines a specific infrared zone where the stopped ball exists as a ball existing zone in plural infrared zones. The first object appearance determining part 302 determines the front and end infrared zones being adjacent the ball existing zone as front and end object appearance schedule zones, and determines whether or not the object for launching the ball appeared in either one of the front and end object appearance schedule zones. The second object appearance determining part 303 determines whether or not the object appeared in the remaining object appearance schedule zone when the object appeared in either one of the front and end object appearance schedule zones. The ball disappearance determining part 304 determines whether or not the ball in the ball existing zone disappeared when the object appeared in the remaining object appearance schedule zone.

Abstract: The ball existence determining part 301 determines a specific infrared zone where the stopped ball exists as a ball existing zone in plural infrared zones. The first object appearance determining part 302 determines the front and end infrared zones being adjacent the ball existing zone as front and end object appearance schedule zones, and determines whether or not the object for launching the ball appeared in either one of the front and end object appearance schedule zones. The second object appearance determining part 303 determines whether or not the object appeared in the remaining object appearance schedule zone when the object appeared in either one of the front and end object appearance schedule zones. The ball disappearance determining part 304 determines whether or not the ball in the ball existing zone disappeared when the object appeared in the remaining object appearance schedule zone.

Abstract: The image capturing part 201 captures a ball in flight with a camera continuously. The image corresponding part 203 generates a first registered ball image obtained by making a size of a first ball image in a first capturing image captured first correspond to a size of a second ball image in a second capturing image captured second. The 3D model constructing part 204 constructs a 3D model of the first registered ball image obtained by converting a camera coordinate system of the generated first registered ball image into a world coordinate system. The virtual rotating part 205 rotates virtually the constructed 3D model of the first registered ball image by using a rotation parameter estimated in advance and rotation matrix information.