1. An image processing apparatus comprising at least one processor operating under control of executable computer code stored in a non-tangible, computer readable recording medium, such that the image processing apparatus operates to: obtain an image of an object, which includes a face of a person wearing an optical display apparatus by which to observe a stereoscopic image that contains a first parallax image and a second parallax image obtained when the object in a three-dimensional (3D) space is viewed from different viewpoints; identify the optical display apparatus included in the image of the object; detect a facial region of the face of the person included in the image of the object, based on the identified optical display apparatus; and generate an image of the face of the person that does not include the optical display apparatus by excluding the identified optical display apparatus, and by adding the face of the person to the detected facial region.