A support plate with a horizontal flat standing surface carries two posts, and is rotated about a vertical axis. A stationary triangulation measuring head having a camera and a light line projector, projects light lines, which are perpendicular to the plane of the support plate, onto a person who stands upright on the standing surface of the plate. Encoded, photogrammetrically evaluatable marks are arranged on the plate around the standing surface and on the post. Images taken by the camera during rotation of the plate are transferred to a computer to determine a three-dimensional shape of the person or of part of the person. Marking-free fields are arranged on the support plate and on the post. The computer determines the parameters of the triangulation measuring head to performs a self-calibration of the detection process based on positions of the photogrammetric marks and shapes of light traces on the marking-free fields.
