03/13/2003
15-462 Graphics I
28
Temporal Aliasing
•Sampling
rate is frame rate (30 Hz for video)
•Example:
spokes of wagon wheel in movie
•Possible
to supersample and average
•Fast-moving
objects are blurred
•Happens
automatically in video and movies
–Exposure
time (shutter speed)
–Memory
persistence (video camera)
–Effect
is motion blur