Distances on a solid plate.

For each of the four triangles the distances between the markers were measured by hand using a measuring tape, by the VICON system and by the novel spine and surface topography system. The differences between the measurements are shown in millimeters as well in percentage of the deviation from the actual tape measured side lengths. A total of 12 side lengths of four triangles were measured resulting in a mean difference between the tape measurements and rasterstereography of 0.13±0.84 mm. The difference was −0.73±0.71 mm between tape and VICON measurements and −0.86±1.09 mm between rasterstereography and the VICON system.