1. An image processing method, comprising: detecting a face region of a person from an image formed by a plurality of pixels, and judging a scene of the image based on a pixel value of the detected face region of the person and a pixel value of a nonface region excluding the face region in the image to be one of a normal scene, a backlit scene or a night scene, wherein: when the scene of the image is judged based on the pixel value of the face region and the pixel value of the nonface region, (1) the scene of the image is judged to be the normal scene, if a difference between the pixel value of the face region and the pixel value of the nonface region is less than a predetermined value, (2) the scene of the image is judged to be the backlit scene, if the pixel value of the nonface region is greater than the pixel value of the face region by a predetermined value or more, or (3) the scene of the image is judged to be the night scene, if the pixel value of the face region is greater than the pixel value of the nonface region by a predetermined value or more.