1. An information processing apparatus for estimating a projective transformation from a first frame image in a moving image to a second frame image in the moving image, the second frame image corresponding to the first frame image, the information processing apparatus comprising: one or more processors; and at least one memory coupled to the one or more processors, the at least one memory having instructions stored thereon which, when executed by the one or more processors, cause the information processing apparatus to: calculate, in each of the first frame image and the second frame image, an area of a triangle whose apexes are three feature points of four feature points; calculate, in each of the first frame image and the second frame image, a first transformation matrix and a second transformation matrix for transforming four reference feature points into the four feature points, by using the area of the triangle whose apexes are three feature points of the four feature points; and calculate the projective transformation from the first frame image to the second frame image as a third transformation matrix for transforming the four feature points of the first frame image into the four feature points of the second frame image, by using the first transformation matrix and the second transformation matrix.