“…In contrast to that, a range camera provides an image of distance values. More precisely, the measured range value for each range pixel can be adjusted by means of calibration to be the distance along the viewing ray P À1 r ðx 0 ; 1Þ > between the surface observed by the range camera and the optical center of the camera [13]. We denote this distance information by the function d 0 : P 0 !…”