Abstract: Method and arrangements for removing erroneous points from a set of points (355-1 . . . 355-15) of a three dimensional, 3D, virtual object provided by 3D imaging of a corresponding real world object (320) by means of a camera (330) with image sensor (331). Said set of points (355-1 . . . 355-15) is obtained (401). It is identified (403), for respective point (355), conflicting points, if any, in the set. A conflicting point is a point of the set that cannot validly coexist with the respective point (355) according to predefined one or more criteria. It is removed (404), from the set, based on said identification, one or more points of the set that have been involved in conflicts a greater number of times than other points of the set involved in conflicts.

Abstract: Determination of information regarding an intensity peak position in a space-time volume (360; 361) formed by image frames generated by an image sensor (331) from sensing of light reflected from a measure object (320) as part of light triangulation. The space-time volume (360; 361) is further associated with space-time trajectories relating to how feature points of the measure object (320) map to positions in the space-time volume (360; 361). A first hypothetical intensity peak position, HIPP1, (551a; 651a) is obtained (701 in said space time volume (360; 361). A first space time analysis position, STAP1, (552a; 652a) is computed (702) based on space-time analysis performed locally around the HIPP1 (551a; 651a) and along a first space time trajectory associated with the HIPP1 (551a, 651a). Said information regarding the intensity peak position is determined (703) based on the HIPP1 (551a; 651a) and the STAP1 (552a; 652a).