Establishes a dynamic local coordinate system based on one or two tracing markers.
From the Media ribbon, click the Tracking tool
to display the panel.Figure 1.
Figure 2.
When a marker is traced, the coordinates of the marker can be reported with respect
to the tracking system defined in this panel. This enables you to calculate only the
dynamics of marker movement by removing overall motion of the video.
The user-defined coordinate system is displayed in the graphics area with arrows of
the selected colors to represent the X and Y axes.
Collectors
Use the Origin collector to select the marker to be used as the
origin.
Use the X/Y Axis collector to select the marker that designates the axis
(relative to the origin).
Click to switch between the X and Y axis.
Only one collector can be active at a time. Once the first set of
coordinates has been selected for the Origin collector, the Axis
selector becomes active.
Start Time
End Time
Two start and end time fields exist:
The start time and end time for the origin marker, showing the
start and end time steps in the video during which the marker is
valid.
The start time and end time for the X axis or Y axis marker,
showing the start and end time steps in the video during which
the marker is valid.
Valid Time Range
The time range during which the defined tracking system is valid. Since
both markers must be valid in order for the system to be valid at a
given time, the start time will always be the latter of the selected
markers’ start times, and the end time will always be the earlier of the
selected markers’ end times.
Animation Control Time Range
The time range shown by the start and end times in the Animation
Controls panel, and can be synced to the valid time range using Sync
Range.
Sync Range
Syncs the Animation Controls time range to the tracking system’s valid
time range. Click Sync Range to update the start time and end time edit
fields for the Animation Controls Time Range and also to update the
start and end times in the Animation Controls panel.
Use tracking system
This option is disabled by default, and is enabled and automatically
selected once a tracking system has been defined. When off, marker
tracing data is reported with the origin assumed to be in the lower left
corner of the video.
Pin video at origin
This option will cause the origin to remain fixed in place on the screen
while animating, during the time frame when the origin is a valid
tracing marker.
Global X axis
Click the color selector to select the x-axis color.
Global Y axis
Click the color selector to select the y-axis color.
Axis Labels
Click the color selector to select the axis labels’ colors.
Note: When tracking with respect to the user-defined system, the locations of all
markers are reported in terms of the user-defined coordinate system. The
markers used as the bases for the coordinate system appear as static values of
(0, 0) for the origin at CS point 1, and (0, <pixels or units>) or
(<pixels or units>, 0) for the marker at CS point 2.
