An image processing apparatus includes: a motion prediction processing unit detecting an inter-image motion between a standard image and a reference image; a motion compensation processing unit generating a motion-compensated image by moving the reference image so as to be aligned with the standard image in a pixel position; an addition processing unit generating a noise-reduced image from which noise of the standard image is reduced; and an addition determination unit calculating an addition weight of the motion-compensated image. The addition determination unit includes a first motion region detection unit calculating a motion region determination value, a second motion region detection unit calculating a motion region determination value, a control map generation unit selecting and outputting one of two motion region determination values, a noise determination table generation unit generating or correcting a noise determination table, and an addition determination processing execution unit determining the addition weight.