Re: measuring distance between two cars using infrared circuits

From: Dave VanHorn (dvanhorn_at_dvanhorn.org)
Date: 01/24/05 

Date: Sun, 23 Jan 2005 23:20:28 -0500

> For a change of 1 foot at 50', that would be an angular change of
> 1/2500. It's better at 10', where a foot change would cause 1/100 change
> in angle. If the maximum width were 500 pixels, then you could detect a
> foot change (ie, 1/500 = 1 pixel) at 22 feet.

Well, the good news is that as it becomes more important, it becomes easier
to see the difference.
:)

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