Fecha de publicación: 29/12/2022 Fuente: WIPO (eseential oils OR extracts) An image analysis device comprises a signal separation unit 10 that: receives, as input, a plurality of radar images in which the same geographical region is recorded and a phase gradient model that represents the phase differences between a plurality of nearby pixels at the surface of an analysis target that could be present in the radar images; and extracts a component that conforms to the phase differences represented by the phase gradient model from the radar images.