Vision Research Phantom v1211, Manual

Page: 45 / 88

Chapter 5: Measurements
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If all the points are in the same image when performing
three or four-point measurements, the software only
calculates the angle. In order to compute angular speed
the first point and the reference point must be on the
same image while the second point (three-points
measurements) or reference point 2 and point 2
(four-point measurements) must be on different images.
Angular speed is calculated using the formula:
as = a/dt, where a = measured angle, dt = [time of the
last point frame] – [time of the first point frame] if first
and last points are on different frames.
These measurement tools are exceptional when analyzing
a rotating object.
The ability to measure an object, like a projectile rotating
in mid-air, to determine its angular speed can be applied
to other sciences, for example, the way 2 x 4 board could
tumble in hurricane-force winds can be
PCC calculates speed (mph) and angular speed (rpm) of the fan motor using Distance,
and Angle, and Speed: 1 Point measurement tool.