Fig. 1
From: Technical assessment of the NDI Polaris Vega optical tracking system
On the left panel, the 3D position measurement thermal drift over 2000s after camera cold start. Raw data in blue are fit with a two-terms exponential decay plotted in green and its first derivative drift rate is in orange. The two vertical dotted lines indicate the half times of the fast and slow drift components. The measurement jitter on individual direction components (x,y,z) is displayed on the right panel, for three points located at approximately 150 cm (M1), 151.5 cm (M2) and 175 cm (M3) from the camera sensor