1. A method for image inspection comprising: capturing, by a computer, a reference image or a Fourier transformed image of the reference image from a storage part or a camera; capturing, by the computer, an identified image or a Fourier transformed image of the identified image from the storage part or the camera; obtaining, by the computer, intensity information of the Fourier transformed image of the reference image and the Fourier transformed image of the identified image, and phase information of: (1) the Fourier transformed image of the reference image, or (2) the Fourier transformed image of the identified image, or (3) both of the Fourier transformed image of the reference image and the Fourier transformed image of the identified image; taking, by the computer, a difference in intensity information between the Fourier transformed image of the reference image and the Fourier transformed image of the identified image and the result is subject to an inverse Fourier transformed image of an expression by the differential intensity information and the phase information of the Fourier transformed image of one of the reference image and the identified image; outputting, by the computer, the inverse Fourier transformed image to an output part or a display part; and extracting, by the inverse Fourier transformed image, an image defect of the identified image or a difference in image between the reference image and the identified image as a difference between the identified image and the reference image.