The present invention relates to a device, system and method for image segmentation of an image of a scene including a subject. To improve the segmentation, the device comprises a receiver (210) configured to receive electromagnetic radiation reflected from a scene including a subject, a polarization unit (220) configured to apply a first polarization on the received electromagnetic radiation to generate first polarized radiation and to apply a second polarization, which is different from the first polarization, on the received electromagnetic radiation to generate second polarized radiation, a sensor unit (230) configured to generate a first image from the first polarized radiation and a second image from the second polarized radiation, and a segmentation unit (250) configured to identify areas of different materials in the scene from a combination of the first and second images. Further, a vital sign determination unit (240) is provided that is configured to select an area representing skin of the subject, to generate a first detection signal having a first polarization direction from the first polarized radiation in the selected area and a second detection signal having a second polarization direction, which is different from the first polarization direction, from the second polarized radiation in the selected area, and to determine a vital sign from the two detection signals by combining the two detection signals.La présente invention concerne un dispositif, un système et un procédé de segmentation d'image d'une image d'une scène comprenant un sujet. Afin d'améliorer la segmentation, le dispositif comprend : un récepteur (210) conçu pour recevoir un rayonnement électromagnétique réfléchi à partir d'une scène comprenant un sujet ； une unité de polarisation (220) conçue pour appliquer une première polarisation sur le rayonnement électromagnétique reçu, afin de générer un premier rayonnement polarisé, et pour appliquer une seconde polarisation, différente de la pre
