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Originally Posted by russell
You people are so intent on making things more complicated. Just think about it. Regardless of what you do everything is going to come down to trig in the end, and you need a total of three angles and sides in order to compute the other three. If you use two cameras then you are getting two somewhat inexact angles, along with one short side (unless you mount them one on top of the other, then you just get one long side and two inexact angles). On the other hand if you use just one camera, and mount it on top of your robot not only do you have one relatively precise angle to supplement the remaining inexact angle, you also have one long side. So not only is it less complex, it is also more accurate. And doesnt require three batteries or sixty RCs, or two cameras  . The only downside is you dont get a weeks supply of krispy kreams. |
One camera will work great for giving you distance, but only when you're really close to the tetra. Trigonometry produces inexact values when angles are large (because the distance changes a large amount for a small change in the angle). It is much more exact when angles are small. The reason you'd want to use two cameras is that you then have two angles to use which increases your accurracy and decreases the error (if you implement it correctly).
Matt