Explain how aliasing causes this effect
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Watching a "Western" on television, you may have noticed that sometimes the wheels on a fast stagecoach appear to be rotating backward. Explain how aliasing causes this effect.
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Solution Summary
This solution explains how aliasing causes this effect. Why a stagecoach appears to be rotating backward is determined.
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The reason we see the wheel "go backwards" is due to the fact that the image we see on the screen is not a continuous motion, but rather a series of sampled still images.
A movie camera samples the continuous motion of an object at a rate of 24 still images per second.
Let's assume that the wheel is also turning at a rate of 24 revolutions per seconds.
In this case, all the still images will ...
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