An image processing apparatus includes an image acquisition part that acquires a plurality of different measured images, a modeling part that identifies, for each pixel, a modeled parameter approximating an approximation function of a data sequence where pixel values of pixels corresponding to the respective measured images are placed in an order of capturing, a reconstructed image generation part that generates reconstructed images which are images corresponding to the respective measured images and reconstructed with an approximation value of each pixel identified based on the modeled parameter of each pixel, and an image changing part that changes the pixel values of the measured images based on statistics of the pixel values of the measured images and that of the corresponding reconstructed images.