Tracking Tool

The tracking tool allows an object to be tracked with its position, velocity and acceleration charted and logged.

To start tracking select the Track tool and check Enable. Scrub or play to the time in the clip where tracking should begin and stop playback. Press Set ROI and use the mouse or touchpad to drag the tracking rectangle over the object to be tracked (the Region of Interest or ROI). Place the mouse cursor in the middle of the rectangle to drag the entire ROI or drag the edges or corners to resize the ROI. Press Set ROI again and the rectangle should turn solid yellow to indicate that tracking is now active. Note that when resizing the ROI the rectangle will snap to a specific size due to certain internal constraints in the tracking algorithm.

Press Play and the yellow ROI rectangle should follow the object being tracked. Let the clip play for the desired tracking duration and then stop the clip. Note that tracking can be disrupted by background clutter. High contrast objects work best.

To restart tracking from the same origin point, press Return to start. The clip will rewind to where tracking was initiated and the ROI will be reset.

The tracking history between where the ROI was set and the point where the clip is stopped is logged, and the clip can be freely scrubbed between these two points. Scrubbing outside these points is blocked while tracking is enabled. In order to extend tracking beyond the previous stop point just start the clip playing again. If it is desired to start tracking earlier in the clip than when the ROI was defined press Set ROI to unlock the scrubbing range and scrub to the new start point, repositioning the ROI as well if desired. Press Set ROI again to return to tracking mode.

Charts for position, velocity and acceleration can be enabled by selecting the appropriate checkbox. Scaling for each chart can be adjusted using the relevant Scale sliders, with the steppers adjacent to the slider providing a 10³ coarse adjustment. Alternatively autoscaling can be enabled for all charts by checking Autoscale. The chart span can be adjusted by dragging the Span slider.

If calibration has been applied using the procedure in the Measure Tool then real world units can be selected in the Units pulldown.