The present invention is directed to an image processing device including: a unit configured to extract, as target data, a set of signal values of pixels included in a target region including a target pixel in an input image; a unit configured to obtain reference data for each of a plurality of reference pixels corresponding to the target pixel; a unit configured to generate transformation reference data by transforming the reference data; a unit configured to determine a weight for each of a plurality of transformation reference pixels based on the target data and the reference data; and a unit configured to generate an output pixel corresponding to the target pixel by using a signal value calculated based on the transformation reference pixels and the weights.