The purpose of the invention is to increase accuracy in detecting a person on the basis of the size of an object detection region in an omni-directional image. A height-and-width switching section for switching between the height and the width of the object detection region on the basis of the position of the object detection region in the omni-directional image is provided. It is determined on the basis of the height and the width of the object detection region for which the height and the width are switched by the height-and-width switching section whether the object detection region is a person detection region. As a result, the person detection region and a shadow detection region can be correctly separated in the omni-directional image.