1. Device for monitoring movement and orientation of a person, the device comprising: an imaging unit for obtaining images over time; a holding means for holding said imaging unit to obtain images from the surroundings of the person, wherein the holding means comprises a holder for placing the imaging unit onto the person such that the imaging unit is facing away from the person, and a processing unit for detecting movement and orientation of the person based on detecting changes in subsequently obtained images, wherein the detected changes in subsequently obtained images comprise periodic displacements of one or more features of surroundings in the subsequently obtained images for detecting movement of the person.