1. An image processing device comprising: a shooting scene determining section that determines whether a shooting scene of an acquired image is a low correlation scene containing an object as an isolated point at which a correlativity between a target pixel and a surrounding pixel positioned in proximity to the target pixel is low; a correlation evaluation value calculating section that calculates a correlation evaluation value in plurality representing a correlativity between the target pixel and the surrounding pixel in plurality in the image, respectively; a weight setting section that sets a weight heavier to the correlation evaluation value calculated from the surrounding pixel having a high correlativity with the target pixel, when the shooting scene of the image is the low correlation scene than when the shooting scene is not the low correlation scene; an isolated-point degree calculating section that subjects the correlation evaluation value in plurality calculated by the correlation evaluation value calculating section to weight addition according to the weight to calculate an isolated-point degree of the target pixel; and a fixed pattern noise correcting section that corrects a pixel value of the target pixel based on a pixel value of the surrounding pixel according to a magnitude of the isolated-point degree.